Performance investigation of a permanent magnet generator (original) (raw)
Related papers
2015
The application, construction, and principle of operation of the torque motor having permanent magnets are presented first. Since dynamic behaviour of a servo-hydraulic system is, to a large extent, determined by dynamic behaviour of the applied torque motor, an analysis of motor’s dynamic behaviour is carried out and its dynamic transfer characteristic is determined. Finally, the simulation and experimental results of dynamic behaviour of the torque motor are presented.
Friction Effect Analysis of a DC Motor
American Journal of Mechanical Engineering, 2013
Precision positioning systems are fundamental components in industrial machines such as machine tools, measuring machines and semiconductor manufacturing systems. The performance of the machines depends on the positioning systems. For precise positioning are often used DC motors. The paper deals with experimental method of DC motor friction identification. The aim of the paper is determining of suitable way of DC motor friction modeling. At first the basic static friction models are introduced and linear mathematical model of DC motor is established. DC motor friction identification is by means of experimental method done using Newton´s mechanics. For experiment PITTMAN 9413 motor with encoder is used. For measuring of friction torque the measuring I/O card is used which cooperates with Matlab / Simulink by Real Time Toolbox. Then the mathematical model is simulated and compared with real model of DC motor. In the conclusion the effects of particular friction models affecting DC motor are described and the best way of friction modeling for DC motor is determined.
www.ijstr.org Comparative Review Of PMSM And BLDCM Based On Direct Torque Control Method
2015
Abstract: The direct torque control theory has achieved great success in the control of BLDC motor and PMS Motor. Many researches was carried out to apply the idea of DTC of BLDCM to PMSM since 1990’s.The DTC is applied by choosing the appropriate voltage vector based on the switching status of inverter which was determined by the error signals of reference flux linkage and torque with their measured real value acquired by calculating in the stationary reference frame by means of simply detecting the motor voltage or currents. Aiming at the DTC in PMSM Drives, this research presents the theoretical basis of the DTC for PMSM firstly. Then the difference between the application of DTC to PMSM and to BLDCM, their model on the rotor reference frame with their respective motor equations was explained and presented.
Speed Torque characteristics of Brushless DC motor in either direction on load using ARM controller
This paper presents the speed torque characteristics of BLDC motor on load in forward and reverse direction. The Hall sensors of the BLDC motor is bestowed as the input to the ARM controller. The PWMs are produced depending upon the input of the controller. In order to convert DC to three phase AC, three phase bridge inverter with MOSFET as switches is used. The generated PWMs are inputted to the gate of the MOSFETs in the inverter. The output of the inverter is the energization sequence of BLDC motor and only two phases energizes at once. Dynamometer is used for encumbering the motor. The results are acquired for variable load torque and Speed torque characteristics are observed. Since 1980's new prototype concept of permanent magnet brushless motors has been built. The Permanent magnet brushless motors are categorized into two kinds depending upon the back EMF waveform, Brushless AC (BLAC) and Brushless DC (BLDC) motors [2]. BLDC motors have trapezoidal back EMF and quasi-rectangular current waveform. BLDC motors are quickly becoming famous in industries like Appliances, HVAC industry, medical, electric traction, automotive, aircrafts, military equipment, hard disk drive, industrial automation equipment and instrumentation because of their high efficiency, high power factor, silent operation, compact, reliability and low maintenance [1].In the event of replacing the function of alternators and brushes, the BLDC motor requires an inverter and a position sensor that exposes rotor position for appropriate alternation of current. The rotation of the BLDC motor is built on the feedback of rotor position that is gained from the hall sensors. BLDC motor generally utilizes three hall sensors for deciding the commutation sequence. In BLDC motor the power losses are in the stator where heat can be easily shifted through the frame or cooling systems are utilized in massive machines. BLDC motors have many benefits over DC motors and induction motors. Some of the benefits are better speed versus torque characteristics, high dynamic response, high efficiency, long operating life, noiseless operation, higher speed ranges [2].Till now, over 80% of the controllers are PI (Proportional and integral) controllers because they are facile and easy to comprehend [3]. The speed controllers are the conventional PI controllers and current controllers are the P controllers to ARM 2148 controller is 16/32-bit, 8 to 40 KB of on-chip static RAM and 32 to 512 KB of on-chip flash program memory, 128 bit wide interface/accelerator enables high speed 60 MHz operation, USB 2.0 Full Speed compliant Device Controller, 8KB of on-chip RAM accessible to USB by DMA, two 10-bit A/D converters, two 32-bit timers/external event counters PWM unit and watchdog, low power real-time clock with independent power and dedicated 32 kHz clock input, On-chip integrated oscillator operates with an external crystal in range from 1 MHz to 30 MHz and with an external oscillator up to 50 MHz, Processor wake-up from Power-down, Single power supply chip with Power-On Reset (POR) and BOD circuits: CPU operating voltage range of 3.0 V to 3.6 V (3.3 V ± 10 %) with 5 V tolerant I/O pads. The architecture of ARM 2148 is shown in fig. 8.
Design and Analysis of Permanent Magnet Synchronous Motor used in Industrial Robot
Proceedings of the Fourth National Conference on Science and Engineering (Northern Myanmar), 2011
This paper presents design and analysis of Permanent Magnet Synchronous Motor (PMSM) used in industrial robot. Robotics is the applied science of motion control for multi-axis manipulators and is a large subset of the field of "mechatronics" (Mechanical, Electronic and Software engineering for product or systems development, particularly for motion control applications).Permanent Magnet Synchronous Motors have wide applications in industry, especially in AC servo drives such as industrial robots, and suitable when the application requires speed regulation. PMSM has gained interest due to several factors like reduced cost, ability to operate at near zero speed even at full load and flux weakening capability for spindle and traction applications. As the high field strength of neodymium-iron-boron (NdFeB) magnets become commercially available with affordable prices, PMSMs are receiving increasing attention due totheir high speed, high power density and high efficiency.
Speed and Torque Control Challenge of PMSM
This paper presents modeling and implementation Challenge of speed toqrue rotor field oriented control of permanent magnet synchronous machine (PMSM)drive. An experimental setup consisting of IGBT inverters and a-TMS320LF240 DSP based digital controller is developed in the laboratory in IIT Kharagpur to implement the control algorithms. A voltage model based flux observer is used for estimating the speed and position of PMSM. In order to get good starting characteristics a rotor initial position algorithm is also implemented in the control algorithm. For control purpose PMSM is consider like dc motor. The torque and speed in the dc motor can be controlled independently by controlling armature current and field current respectively ensures that dc motor has good dynamic performance.