Jan Kanuch - Academia.edu (original) (raw)
Papers by Jan Kanuch
Elektronika ir Elektrotechnika
This paper deals with the design, implementation, and measurements of a frequency converter with ... more This paper deals with the design, implementation, and measurements of a frequency converter with bipolar sinusoidal pulse width modulation (SPWM) of output voltage for two-phase induction motors. The paper is dedicated to an analysis of the operation of a two-phase frequency converter and its implementation. The inverter has a single-phase H-bridge topology with split DC link and bipolar switching to minimise the number of components. Insulated gate bipolar transistors (IGBTs) are used in the realisation of the inverter power section. The inverter is controlled using a digital signal processor (DSP) TMS320F28335. Measurements with a 0.12 kW two-phase induction motor were performed to verify the correct operation of the inverter. The influence of the switching frequency on the motor current ripple is measured for frequencies of the first harmonic up to 100 Hz.
This document deals with electromagnetic compatibility (EMC) of universal motor operating at AC a... more This document deals with electromagnetic compatibility (EMC) of universal motor operating at AC and DC power supply. Universal motors are used in a variety of applications and can be operated either at AC or DC supply current. The advantages of universal motors are especially high starting torque, very compact design and high running speeds. The drawback consists in the fact that the commutator and arcing brushes create electromagnetic interference (EMI), ozone and noise. This paper presents the results of oscilloscopic measurement of disturbing magnetic field in proximity of a universal motor at various speeds at AC and DC operation mode. The time derivation of the magnetic flux density is converted by an inductive coil to a voltage to be observed by oscilloscope.
Presented in this paper is a novel design of the permanent magnet motor for easy low power applic... more Presented in this paper is a novel design of the permanent magnet motor for easy low power applications. Neither in-detail arrangement nor functioning of the magnetic motor are described herein for the device will be subject to patenting process. Currently, known are different technical solutions for electric motors that use magnetic and electromagnetic fields. The magnetic motor works only on the basis of repulsion of permanent magnets. The basis of the technical solution dwells is use of auxiliary magnets. Auxiliary magnets axially move the main drive magnets so that the rotor can be continuously rotated in defined direction. Keywords—magnetic motor, permanent magnet, design.
Universal motors are usually operated in AC mode and are controlled by means of triacs. This conv... more Universal motors are usually operated in AC mode and are controlled by means of triacs. This conventional solution is characterized by a cheap control hardware. On the other hand, it has some drawbacks. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. Significant improvements are obtained when using a more exacting converter. This paper presents the results obtained by using a diode rectifier and PWM controlled IGBT chopper. The RMS and peak-to-peak current of the motor are reduced, as well as electric losses and brush temperature. In addition, this operation mode enables increasing the motor output power or the motor lifetime. In order to reduce switching losses and electromagnetic interference of the converter, the assumed switching frequency is not higher than 1000 Hz.
This paper presents the design and the electromagnetic field simulation of axial-flux permanentma... more This paper presents the design and the electromagnetic field simulation of axial-flux permanentmagnet stepper motor with the disc type rotor. The stepper motor with disc type permanent magnet rotor shows the advantages of higher torque at high speed, low moment of inertia, high torque to weight ratio, low power consumption and ironless rotor having minimum iron loss using permanent magnets and prepregs. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D electromagnetic field simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.
This paper describes the simulation and measurement of two-phase synchronous motor prototype with... more This paper describes the simulation and measurement of two-phase synchronous motor prototype with permanent magnets. Based on geometric dimensions, a 3D solid model was created in ANSYS/Maxwell program. The electromagnetic design was calculated in ANSYS/RMxprt program. The cross section with graphically presented magnetic field, in particular a part of electromagnetic circuits, was shown. The 3D magnetic simulation, simulated and measured characteristics of the motor and analysis of the two-phase synchronous motor with permanent magnets presents an integral part of the article, too. Slowa kluczowe: dwufazowy silnik synchroniczny, magnes trwaly, program ANSYS/Maxwell
This paper describes the control of two-phase induction motor using a conventional three-phase br... more This paper describes the control of two-phase induction motor using a conventional three-phase bridge inverter. Two-phase induction motors in comparison with conventional three phase motors have the advantage of a simple stator current vector control. The physical phase currents themselves represent the coordinates of the stator current vector. For this reason two-phase induction motors are ideal for educational purposes as well as for experiments verifying various control strategies (for example sensorless speed control). The inherently best inverter topology for a two-phase induction motor consists of two single-phase bridge inverters. However, using a conventional three-phase bridge inverter may be an interesting alternative described in this paper.
The brushless machine with axial flux and permanent magnets (AFPM), also called the disc-type mac... more The brushless machine with axial flux and permanent magnets (AFPM), also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. AFPM disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The first parts of the paper compare of drive system with disk-motor to the motor with cylindrical shape, as well as disk-motor with radial and axial flux. Next part of the contribution describes types of the disk motors and their construction. The 3D magnetic simulation and analysis of the disk stepper motor with permanent magnets is being subject of the article, too. The unique disc-type profile of the rotor and stator of AFPM machines makes it possible to generate diverse and interchangeable designs. AFPM machines can be designed as single air gap or multiple air gaps machines, with slotted, ...
In the first part of paper there are described various constructions of existing electric drives ... more In the first part of paper there are described various constructions of existing electric drives used in a wheelchair driven by an electric motor and also described is the most widely used current technology drive of the wheelchair. Further this paper describes a new design and technical solution of the concepts of the proposed drive with the choice of the type construction drive and steering, construction of the motor, battery and appropriate drive parameters. Results of construction and electromagnetic design of disc brushless motor with a central stator and double-tapping external rotor suitable for location in 24" rear wheels of a wheelchair are also described. Streszczenie: W pierwszej części artykułu opisano różne konstrukcje istniejących napędów elektrycznych, używanych w wózku inwalidzkim napędzanym silnikiem elektrycznym. Następnie opisano nowy projekt i techniczne rozwiązanie koncepcji proponowanego napędu z wyborem napędu budowlanego i układu kierowniczego, konstrukc...
The paper deals with suggested concept of direct drive for small electric vehicle, using a threep... more The paper deals with suggested concept of direct drive for small electric vehicle, using a threephase double disc BLCD motor. Presented and described in the article are results of electromagnetic design and construction of a disc brushless motor with central slotted stator and double outer rotor with permanent magnets that has been found to be suitable for its positioning within wheel of small electric vehicle. Streszczenie: W artykule omówiono koncepcję bezpośredniego napędu małego pojazdu elektrycznego z wykorzystaniem trójfazowego tarczowego silnika BLCD. Przedstawiono i opisano wyniki projektu elektromagnetycznego i bezszczotkowego silnika tarczowego z centralnym szczelinowym stojanem i podwójnym wirnikiem zewnętrznym z magnesami trwałymi, który został umieszczony w obrębie koła małego pojazdu elektrycznego.
This paper presents the design, simulation and measurement of a synchronous motor prototype with ... more This paper presents the design, simulation and measurement of a synchronous motor prototype with an external rotor by using permanent magnets which was optimized for high-torque, in-wheel operation. Based on geometric dimensions, the 3D solid model was created in ANSYS/Maxwell program. The electromagnetic design was calculated in ANSYS/RMxprt program. The cross section with graphical presentation of magnetic induction in particular parts of electromagnetic circuits and the simulated and measured characteristics of the motor are shown.
Multiphase induction motors have recently gained attention in many applications where needed is h... more Multiphase induction motors have recently gained attention in many applications where needed is high overall system reliability. Electrical machines with increased number of phases are being used primarily because of their safety and reliability comparing with three-phase induction machines. The additional phases compared to standard three–phase motors allow the creation of a rotating flux even in fault conditions. The control technique in post–fault situation must ensure operation of the induction machine. The paper deals with operation of five-phase induction motor in case three-phase supply. Streszczenie: Wielofazowe silniki indukcyjne zyskały ostatnio na znaczeniu w wielu zastosowaniach, gdzie potrzebna jest wysoka ogólna niezawodność systemu. Maszyny elektryczne o zwiększonej liczbie faz są używane głównie ze względu na ich bezpieczeństwo i niezawodność w porównaniu z trójfazowymi maszynami indukcyjnymi. Dodatkowe fazy w porównaniu ze standardowymi silnikami trójfazowymi umożli...
The present contribution shows an analytical method of the calculus of the torque ripple and curr... more The present contribution shows an analytical method of the calculus of the torque ripple and current waveforms of a universal motor supplied by a triac directly from the network. The triac output voltage wave� form is formulated by the complex Fourier series. The armature reaction of the motor is included in the calcu� lus. The motor performance is computed using the circuit parameters determined by measurements. The cal� culated current waveforms are compared with the measured ones.
Described in the paper is a new design and technical solution of the Permanent Magnet Motor for e... more Described in the paper is a new design and technical solution of the Permanent Magnet Motor for easy low power applications. Currently, known are different technical solutions for electric motors that use magnetic and electromagnetic fields. The magnetic motor works only on the basis of repulsion of permanent magnets. The basis of the technical solution is use of auxiliary magnets. Auxiliary magnets axially move the main drive magnets so that the rotor can be continuously rotated in defined direction. The hereto paper presents initial results of the construction design and calculated waveforms of magnetic motor with permanent
Energies, 2020
The paper presents the study of an anti-lock braking system (ABS) that has been complemented by a... more The paper presents the study of an anti-lock braking system (ABS) that has been complemented by a fuzzy controller. The fuzzy controller was used to improve the braking performance of the vehicle, particularly in critical situations, for example, when braking a vehicle on wet road. The controller for the ABS was designed in the MATLAB/Simulink program. The designed controller was simulated on a medium-size vehicle model. During testing, three braking systems were simulated on the vehicle model. We compared the performance of a braking system without an ABS, a system with a threshold-based conventional ABS, and a braking system with the proposed ABS with a fuzzy controller. These three braking systems were simulation tested during braking the vehicle on a dry straight road and on a road with combined road adhesion. A maneuverability test was conducted, where the vehicle had to avoid an obstacle while braking. The results of each test are provided at the end of the paper.
Measurement, 2018
This paper presents information about a new device for measuring the synchronous machine load ang... more This paper presents information about a new device for measuring the synchronous machine load angle in laboratory conditions using the optical encoder. The prototype device is used in education for practical measuring exercises in the study course of electrical machines. Described in the article is block diagram of the measuring device. The operation principle of the device and the measurement principle of load angle of the synchronous machine presents a subject of the article, too. Moreover, the device evaluates operating mode (motor or generator) of the synchronous machine.
Archives of Electrical Engineering, 2013
In this paper the design and the magneto-static simulation of axial-flux permanent- magnet steppe... more In this paper the design and the magneto-static simulation of axial-flux permanent- magnet stepper motor with the disc type rotor is presented. Disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The brushless machine with axial flux and permanent magnets, also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D magneto-static simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.
IEEE Transactions on Applied Superconductivity, 2013
Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-de... more Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-density wave behavior but exhibits superconductivity at ambient pressures without chemical doping. It has a superconducting transition temperature, Tc , of 18 K with electron-like carriers and a very high 0 K upper critical magnetic field, Bc2(0), of greater than 80 T making the compound suitable for many high magnetic field applications at cryogenic temperatures. Oxypnictide materials are known for a complexity of their methods of preparation. The reported methods of LiFeAs preparation are based on the solid-state reaction at high temperatures (740-1050 o C) for long times (24-60 hours). In the present work a simple electrochemical route is proposed for the preparation of a pnictide LiFeAs superconductor. During electrolysis Li ions in the electrolyte become inserted into the FeAs lattice to form LiFeAs on the surface of the FeAs electrode. The proposed method differs from the existing electrochemical method and also from the traditional high temperature solid-state reaction methods. It is promising for the preparation of LiFeAs bulks and large scale LiFeAs films or tapes for various electric power or high magnetic field applications at cryogenic temperatures.
SUMMARY This papers deals with the analysis of the electromagnetic compatibility (EMC) – galvanic... more SUMMARY This papers deals with the analysis of the electromagnetic compatibility (EMC) – galvanic coupling problems focused on the area of the power electrical systems. The description of galvanic coupling problem is divided into two separate parts according to the length of common conductors or the working frequency. The first part (PART I.) deals with the galvanic coupling problem of concentrated parameter circuits, such with short common conductors or processed signals with low working frequency. The second one (PART II.) analyzes the same problem for circuits with distributed parameters, such that have long common conductors or processed signals with high working frequency. For detailed problem investigation a mathematical analysis, computer simulation method and verification measuring are used, too.
Electrical Power Quality and Utilisation. Journal, 2005
This paper deals with construction design of DC permanent magnet disc motor by classical calculat... more This paper deals with construction design of DC permanent magnet disc motor by classical calculation method and its verifying by computer finite element simulation method. The paper deals also with the computer analysis of the electromagnetic compatibility (EMC) problems focused to the area of electrical machines, which can also disclose the startling facts concerning. A problem of interference between electric motor and surroundings space caused by electromagnetic field radiation is discussed too.
Elektronika ir Elektrotechnika
This paper deals with the design, implementation, and measurements of a frequency converter with ... more This paper deals with the design, implementation, and measurements of a frequency converter with bipolar sinusoidal pulse width modulation (SPWM) of output voltage for two-phase induction motors. The paper is dedicated to an analysis of the operation of a two-phase frequency converter and its implementation. The inverter has a single-phase H-bridge topology with split DC link and bipolar switching to minimise the number of components. Insulated gate bipolar transistors (IGBTs) are used in the realisation of the inverter power section. The inverter is controlled using a digital signal processor (DSP) TMS320F28335. Measurements with a 0.12 kW two-phase induction motor were performed to verify the correct operation of the inverter. The influence of the switching frequency on the motor current ripple is measured for frequencies of the first harmonic up to 100 Hz.
This document deals with electromagnetic compatibility (EMC) of universal motor operating at AC a... more This document deals with electromagnetic compatibility (EMC) of universal motor operating at AC and DC power supply. Universal motors are used in a variety of applications and can be operated either at AC or DC supply current. The advantages of universal motors are especially high starting torque, very compact design and high running speeds. The drawback consists in the fact that the commutator and arcing brushes create electromagnetic interference (EMI), ozone and noise. This paper presents the results of oscilloscopic measurement of disturbing magnetic field in proximity of a universal motor at various speeds at AC and DC operation mode. The time derivation of the magnetic flux density is converted by an inductive coil to a voltage to be observed by oscilloscope.
Presented in this paper is a novel design of the permanent magnet motor for easy low power applic... more Presented in this paper is a novel design of the permanent magnet motor for easy low power applications. Neither in-detail arrangement nor functioning of the magnetic motor are described herein for the device will be subject to patenting process. Currently, known are different technical solutions for electric motors that use magnetic and electromagnetic fields. The magnetic motor works only on the basis of repulsion of permanent magnets. The basis of the technical solution dwells is use of auxiliary magnets. Auxiliary magnets axially move the main drive magnets so that the rotor can be continuously rotated in defined direction. Keywords—magnetic motor, permanent magnet, design.
Universal motors are usually operated in AC mode and are controlled by means of triacs. This conv... more Universal motors are usually operated in AC mode and are controlled by means of triacs. This conventional solution is characterized by a cheap control hardware. On the other hand, it has some drawbacks. In particular the high peak to peak current gives poor motor efficiency and the consequential high brush temperature leads to limited motor lifetime. Significant improvements are obtained when using a more exacting converter. This paper presents the results obtained by using a diode rectifier and PWM controlled IGBT chopper. The RMS and peak-to-peak current of the motor are reduced, as well as electric losses and brush temperature. In addition, this operation mode enables increasing the motor output power or the motor lifetime. In order to reduce switching losses and electromagnetic interference of the converter, the assumed switching frequency is not higher than 1000 Hz.
This paper presents the design and the electromagnetic field simulation of axial-flux permanentma... more This paper presents the design and the electromagnetic field simulation of axial-flux permanentmagnet stepper motor with the disc type rotor. The stepper motor with disc type permanent magnet rotor shows the advantages of higher torque at high speed, low moment of inertia, high torque to weight ratio, low power consumption and ironless rotor having minimum iron loss using permanent magnets and prepregs. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D electromagnetic field simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.
This paper describes the simulation and measurement of two-phase synchronous motor prototype with... more This paper describes the simulation and measurement of two-phase synchronous motor prototype with permanent magnets. Based on geometric dimensions, a 3D solid model was created in ANSYS/Maxwell program. The electromagnetic design was calculated in ANSYS/RMxprt program. The cross section with graphically presented magnetic field, in particular a part of electromagnetic circuits, was shown. The 3D magnetic simulation, simulated and measured characteristics of the motor and analysis of the two-phase synchronous motor with permanent magnets presents an integral part of the article, too. Slowa kluczowe: dwufazowy silnik synchroniczny, magnes trwaly, program ANSYS/Maxwell
This paper describes the control of two-phase induction motor using a conventional three-phase br... more This paper describes the control of two-phase induction motor using a conventional three-phase bridge inverter. Two-phase induction motors in comparison with conventional three phase motors have the advantage of a simple stator current vector control. The physical phase currents themselves represent the coordinates of the stator current vector. For this reason two-phase induction motors are ideal for educational purposes as well as for experiments verifying various control strategies (for example sensorless speed control). The inherently best inverter topology for a two-phase induction motor consists of two single-phase bridge inverters. However, using a conventional three-phase bridge inverter may be an interesting alternative described in this paper.
The brushless machine with axial flux and permanent magnets (AFPM), also called the disc-type mac... more The brushless machine with axial flux and permanent magnets (AFPM), also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. AFPM disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The first parts of the paper compare of drive system with disk-motor to the motor with cylindrical shape, as well as disk-motor with radial and axial flux. Next part of the contribution describes types of the disk motors and their construction. The 3D magnetic simulation and analysis of the disk stepper motor with permanent magnets is being subject of the article, too. The unique disc-type profile of the rotor and stator of AFPM machines makes it possible to generate diverse and interchangeable designs. AFPM machines can be designed as single air gap or multiple air gaps machines, with slotted, ...
In the first part of paper there are described various constructions of existing electric drives ... more In the first part of paper there are described various constructions of existing electric drives used in a wheelchair driven by an electric motor and also described is the most widely used current technology drive of the wheelchair. Further this paper describes a new design and technical solution of the concepts of the proposed drive with the choice of the type construction drive and steering, construction of the motor, battery and appropriate drive parameters. Results of construction and electromagnetic design of disc brushless motor with a central stator and double-tapping external rotor suitable for location in 24" rear wheels of a wheelchair are also described. Streszczenie: W pierwszej części artykułu opisano różne konstrukcje istniejących napędów elektrycznych, używanych w wózku inwalidzkim napędzanym silnikiem elektrycznym. Następnie opisano nowy projekt i techniczne rozwiązanie koncepcji proponowanego napędu z wyborem napędu budowlanego i układu kierowniczego, konstrukc...
The paper deals with suggested concept of direct drive for small electric vehicle, using a threep... more The paper deals with suggested concept of direct drive for small electric vehicle, using a threephase double disc BLCD motor. Presented and described in the article are results of electromagnetic design and construction of a disc brushless motor with central slotted stator and double outer rotor with permanent magnets that has been found to be suitable for its positioning within wheel of small electric vehicle. Streszczenie: W artykule omówiono koncepcję bezpośredniego napędu małego pojazdu elektrycznego z wykorzystaniem trójfazowego tarczowego silnika BLCD. Przedstawiono i opisano wyniki projektu elektromagnetycznego i bezszczotkowego silnika tarczowego z centralnym szczelinowym stojanem i podwójnym wirnikiem zewnętrznym z magnesami trwałymi, który został umieszczony w obrębie koła małego pojazdu elektrycznego.
This paper presents the design, simulation and measurement of a synchronous motor prototype with ... more This paper presents the design, simulation and measurement of a synchronous motor prototype with an external rotor by using permanent magnets which was optimized for high-torque, in-wheel operation. Based on geometric dimensions, the 3D solid model was created in ANSYS/Maxwell program. The electromagnetic design was calculated in ANSYS/RMxprt program. The cross section with graphical presentation of magnetic induction in particular parts of electromagnetic circuits and the simulated and measured characteristics of the motor are shown.
Multiphase induction motors have recently gained attention in many applications where needed is h... more Multiphase induction motors have recently gained attention in many applications where needed is high overall system reliability. Electrical machines with increased number of phases are being used primarily because of their safety and reliability comparing with three-phase induction machines. The additional phases compared to standard three–phase motors allow the creation of a rotating flux even in fault conditions. The control technique in post–fault situation must ensure operation of the induction machine. The paper deals with operation of five-phase induction motor in case three-phase supply. Streszczenie: Wielofazowe silniki indukcyjne zyskały ostatnio na znaczeniu w wielu zastosowaniach, gdzie potrzebna jest wysoka ogólna niezawodność systemu. Maszyny elektryczne o zwiększonej liczbie faz są używane głównie ze względu na ich bezpieczeństwo i niezawodność w porównaniu z trójfazowymi maszynami indukcyjnymi. Dodatkowe fazy w porównaniu ze standardowymi silnikami trójfazowymi umożli...
The present contribution shows an analytical method of the calculus of the torque ripple and curr... more The present contribution shows an analytical method of the calculus of the torque ripple and current waveforms of a universal motor supplied by a triac directly from the network. The triac output voltage wave� form is formulated by the complex Fourier series. The armature reaction of the motor is included in the calcu� lus. The motor performance is computed using the circuit parameters determined by measurements. The cal� culated current waveforms are compared with the measured ones.
Described in the paper is a new design and technical solution of the Permanent Magnet Motor for e... more Described in the paper is a new design and technical solution of the Permanent Magnet Motor for easy low power applications. Currently, known are different technical solutions for electric motors that use magnetic and electromagnetic fields. The magnetic motor works only on the basis of repulsion of permanent magnets. The basis of the technical solution is use of auxiliary magnets. Auxiliary magnets axially move the main drive magnets so that the rotor can be continuously rotated in defined direction. The hereto paper presents initial results of the construction design and calculated waveforms of magnetic motor with permanent
Energies, 2020
The paper presents the study of an anti-lock braking system (ABS) that has been complemented by a... more The paper presents the study of an anti-lock braking system (ABS) that has been complemented by a fuzzy controller. The fuzzy controller was used to improve the braking performance of the vehicle, particularly in critical situations, for example, when braking a vehicle on wet road. The controller for the ABS was designed in the MATLAB/Simulink program. The designed controller was simulated on a medium-size vehicle model. During testing, three braking systems were simulated on the vehicle model. We compared the performance of a braking system without an ABS, a system with a threshold-based conventional ABS, and a braking system with the proposed ABS with a fuzzy controller. These three braking systems were simulation tested during braking the vehicle on a dry straight road and on a road with combined road adhesion. A maneuverability test was conducted, where the vehicle had to avoid an obstacle while braking. The results of each test are provided at the end of the paper.
Measurement, 2018
This paper presents information about a new device for measuring the synchronous machine load ang... more This paper presents information about a new device for measuring the synchronous machine load angle in laboratory conditions using the optical encoder. The prototype device is used in education for practical measuring exercises in the study course of electrical machines. Described in the article is block diagram of the measuring device. The operation principle of the device and the measurement principle of load angle of the synchronous machine presents a subject of the article, too. Moreover, the device evaluates operating mode (motor or generator) of the synchronous machine.
Archives of Electrical Engineering, 2013
In this paper the design and the magneto-static simulation of axial-flux permanent- magnet steppe... more In this paper the design and the magneto-static simulation of axial-flux permanent- magnet stepper motor with the disc type rotor is presented. Disk motors are particularly suitable for electrical vehicles, robots, valve control, pumps, centrifuges, fans, machine tools and manufacturing. The brushless machine with axial flux and permanent magnets, also called the disc-type machine, is an interesting alternative to its cylindrical radial flux counterpart due to the disk shape, compact construction and high torque density. This paper describes a design of four phase microstepping motor with the disc type rotor. The FEM modeling and the 3D magneto-static simulation of the disk stepper motor with permanent magnets is being subject of the article, too. Disc rotor type permanent magnet stepper motor for high torque to inertia ratio is ideal for robotics and CNC machines.
IEEE Transactions on Applied Superconductivity, 2013
Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-de... more Unlike the known isoelectronic undoped intrinsic FeAs compounds, LiFeAs does not show any spin-density wave behavior but exhibits superconductivity at ambient pressures without chemical doping. It has a superconducting transition temperature, Tc , of 18 K with electron-like carriers and a very high 0 K upper critical magnetic field, Bc2(0), of greater than 80 T making the compound suitable for many high magnetic field applications at cryogenic temperatures. Oxypnictide materials are known for a complexity of their methods of preparation. The reported methods of LiFeAs preparation are based on the solid-state reaction at high temperatures (740-1050 o C) for long times (24-60 hours). In the present work a simple electrochemical route is proposed for the preparation of a pnictide LiFeAs superconductor. During electrolysis Li ions in the electrolyte become inserted into the FeAs lattice to form LiFeAs on the surface of the FeAs electrode. The proposed method differs from the existing electrochemical method and also from the traditional high temperature solid-state reaction methods. It is promising for the preparation of LiFeAs bulks and large scale LiFeAs films or tapes for various electric power or high magnetic field applications at cryogenic temperatures.
SUMMARY This papers deals with the analysis of the electromagnetic compatibility (EMC) – galvanic... more SUMMARY This papers deals with the analysis of the electromagnetic compatibility (EMC) – galvanic coupling problems focused on the area of the power electrical systems. The description of galvanic coupling problem is divided into two separate parts according to the length of common conductors or the working frequency. The first part (PART I.) deals with the galvanic coupling problem of concentrated parameter circuits, such with short common conductors or processed signals with low working frequency. The second one (PART II.) analyzes the same problem for circuits with distributed parameters, such that have long common conductors or processed signals with high working frequency. For detailed problem investigation a mathematical analysis, computer simulation method and verification measuring are used, too.
Electrical Power Quality and Utilisation. Journal, 2005
This paper deals with construction design of DC permanent magnet disc motor by classical calculat... more This paper deals with construction design of DC permanent magnet disc motor by classical calculation method and its verifying by computer finite element simulation method. The paper deals also with the computer analysis of the electromagnetic compatibility (EMC) problems focused to the area of electrical machines, which can also disclose the startling facts concerning. A problem of interference between electric motor and surroundings space caused by electromagnetic field radiation is discussed too.