An Improvement of Output Power in Doubly Salient Permanent Magnet Generator Using Pole Configuration Adjustment (original) (raw)
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Applied and Computational Mechanics, 2021
The doubly salient permanent magnet generator (DSPMG) is widely known as an efficient machine for electrical production from renewable energy. In this paper, we aim to improve the output power of the DSPMG using a structural modification, which is targeted for low-speed electrical generations. Structural parameters including the stator pole depth, thickness of permanent magnet, stator pole arc, and number of winding turns were adjusted, then an optimal value of those parameters was selected based on the characteristics of the generator tested during no-load and on-load conditions. Simulations were based on the finite element method. The generator was targeted to be used for the rated power of 200 W. It was found that the optimally designed generator had a higher electromotive force of 36.1%, a lower cogging torque of 20%, and a higher output power of 12.2% than the conventional structure. The leakage flux of the proposed structure was also improved from the conventional one. Thus, t...
Frontiers in Energy Research, 2021
This paper introduces the pole ratio adjustment technique to improve the torque characteristics of the doubly salient permanent magnetic machine (DSPM). The electrical characteristics of the machine, namely the magnetic field distribution, flux linkage, back-electromotive force (EMF), and cogging torque, were obtained under open-circuit conditions. The electromagnetic torque and ripple torque were examined under the loaded condition. The simulations, based on the 2D-finite element method, show that the optimal pole ratio for the DSPM structure is with 18 stator teeth and 15 rotor poles. This optimal structure achieves a larger phase back-EMF than the conventional structure, as well as had a better magnetic flux path with a reasonable cogging torque. The on-load test also confirmes that the proposed optimal structure can produce a significantly higher electromagnetic torque than the conventional machine while maintaining a satisfactory torque ripple. Furthermore, an experimental prot...
Assessment of power generation capability of doubly-salient PM generator
IEEE International Electric Machines and Drives Conference. IEMDC'99. Proceedings (Cat. No.99EX272), 1999
In thk paper, the characterization of the power production capability of the DSPM generator under loaded conditions will be fully explored by using relevant power electronic circuit implementations. The ac output of the DSPM generator can easily be rectified to power a dc load. In certain applications, the requirement is for constant dc rectifier current, while in some applications dc voltage should be constant. The required rectification can be done by using a variety of power electronics circuits. A diode bridge rectifier with constant current and constant voltage output, and a PWM boost controller with a hysteresis current controller are the implementations of interest. In the case of an actively switched converter, semiconductor devices are used to shape the current, and hence provide a controlled power transfer.
A New Type of Single Phase doubly Salient Permanent Magnet Motor
This paper, presents and discusses the single phase Doubly Salient Permanent Magnet (DSPM) motor. The motor has four stator poles and six rotor poles, two different air-gap lengths are arranged in the stator poles to insure self-start. The rotor parking position is in the effective torque zone of the winding. The motor has a simple and robust structure. The simulation and experimental results show that the motor can achieve a higher efficiency over a large speed range. The detailed operation principle, modeling and finite element analysis of the motor are investigated in this paper. Experimental results for prototype machine are presented.
International Journal of Engineering Research and Technology, 2020
The asymmetrical-pole ratio installed in the partitioned stator doubly salient permanent magnet machine (PS-DSPM) is proposed. Its particular outer stator teeth number is varied to improve the electromagnetic performances. The electromagnetic indicators including the magnetic flux distribution, magnetic flux linkage, back-electromotive force (back-EMF), cogging torque, electromagnetic torque, and ripple torque are investigated and then, compared with the conventional PS-DSPM by finite element analysis simulation. The results illustrate that the symmetrical distribution of the magnetic flux firstly is achieved by all proposed machines. The flux linkage magnitude is increased due mainly to the increase of the magnetic flux paths and winding slots when the increased outer stator teeth number. Especially, we found that the asymmetrical-pole PS-DSPM with 30 outer stator teeth has the suitable outer stator teeth number since it can produce the higher back-EMF waveform with a robust outer stator structure than the other proposed machines as well as a conventional machine. Moreover, the average electromagnetic torque with small ripple torque is reached by this proposed machine, which is 39.29% enhanced from the conventional one under the same copper loss. Hence, the asymmetrical-pole PS-DSPM having 30 outer stator teeth is the novel alternative machine for PS-DSPM improvement.
Energies, 2021
Wind turbine (WT) technology becomes more and more important due to the serious environmental and energy issues. The toothed poles outer rotor doubly salient permanent magnet (DSPM) generator with simple and durable design, high torque and high-power density has a great prospect in wind turbines application. The large diameter makes the construction of such a machine more convenient due to the installation of the turbine blades directly to the outer rotor generator surface. Nevertheless, the size of the generator must be increased to provide larger output power. This increases the generator’s mass. Thus, larger massive DSPM generators are undesirable in wind turbine design. In this paper, an optimization design procedure of the outer rotor doubly salient permanent magnet generator ORDSPMG is proposed for 10 kW WT application. The reduction of the generator weight is demonstrated and proofed. The considered machine version is characterized by having the same effective axial length an...
Principle and Analysis of Doubly Salient PM Motor With Π-Shaped Stator Iron Core Segments
IEEE Transactions on Industrial Electronics, 2019
This paper investigates a novel 3-phase doubly salient permanent magnet (DSPM) motor. Because of the adoption of Π-shaped stator iron core segments, the asymmetrical magnetic circuit among different phases occurring in conventional DSPM motors with E-shaped stator iron core segments can be avoided, so that balanced and sinusoidal 3-phase PM flux linkage and no-load EMF can be achieved. Firstly, based on a 12/7 stator/rotor pole combination, the operation principle of Π-core DSPM motor is discussed using the least magnetic reluctance principle. Then the general airgap field modulation theory (AFMT) is extended to the Π-core DSPM motor for explaining its operation principle further and armature winding connection. The finite element analysis is used to validate theoretical analysis, as well as to calculate its electromagnetic performances. The results show that the 12/7-pole Π-core DSPM motor possesses higher average torque output capability and lower torque ripple compared with the 12/8-pole E-core counterpart. Finally, a 12/7-pole Π-core DSPM motor is built and tested so as to experimentally verify the theoretical analysis. Index Terms-Airgap field modulation theory (AFMT), doubly salient permanent magnet motor, low torque ripple.
Design of Electrical PM Generator with Doublesided Stator and Single Rotor (DSSR) Technology-Part I
2015
This paper present, power generation by using the permanent magnet generator with two stator and single rotor construction. In single sidegenerator, asper the volume itproduces heat but in double sided rotor heat produces is less due toits designaspects i.e. active air mass. In other words the double side construction having the better cooling characteristic. Hence its operational temperature is low [1]. The main advantage of this system, it consist of back to back rotor place in between the stator, hence the weight of rotor is less as compared to double sided rotor technology. Starting torque of this machine is low,hence it give an output instantly. They do not requireany rotor excitation because it's having self-flux and hence it do not produce more excessive heat so life of this system is more.
This paper presents a novel salient pole synchronous generator i.e. permanentmagnet-assisted salient-pole synchronous generator (PMa-SGs). Due to saturation of conventional synchronous generators (SGs), permanent-magnet-assisted salientpole synchronous generators (PMa-SGs) are presented. PMa-SGs are a new type of salient-pole synchronous machines with extra permanent magnets (PMs) between the adjacent pole shoes. Placing PMs between adjacent pole shoes leads to a reduction in flux saturation plus an increase in armature flux linkage. In other words, the generator can operate at higher capacity. In this paper, a comparative study is carried out between conventional SGs and PMa-SGs based on finite element analysis (FEA). This is done via simulation of a PMa-SG compared to a conventional SG. Simulation Results show superiority of PMa-SGs over SGs. In fact, in PMa-SG maximum flux density in stator core is increased and pole bodies are not saturated. Besides, PMa-SG has higher flux linkage compared to conventional SG. Therefore, higher voltage could be produced in the generator. In other words, the output performance of the PMa-SG is considerably better than that of a conventional SG.
Progress In Electromagnetics Research M, 2019
The aim of this work is to reduce the torque ripple of a low-speed/high-torque Doubly Salient Permanent Magnet (DSPM) generator for wind turbine applications. To do this, a combined design and control-based approaches are set up to improve the overall machine performance. The design-based approach helps to develop a form of small stator/rotor teeth combination, focusing on the shapes and dimensions of the teeth that will minimize torque ripple. On the other hand, in the second approach, a control technique is designed. It employs indirect torque control (Torque Sharing Function: TSF), including a PI-controller with gains adjusted continuously for regulating the reference current. The obtained results show that by combining these two approaches, the ripple rate of the electromagnetic torque for the studied DSPM is reduced to a minimum when the teeth shapes are trapezoidal in both the stator and rotor, and the command approach also allows an improvement in the total torque shape, such that the ripple rate decreases by about 96%.