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Analysis and Research on Self-starting PMSM with Pole Width Modulation

Author: WangPeng
Tutor: AnYueJun；SunChangZhi
School: Shenyang University of Technology
Course: Motor and electrical
Keywords: Permanent magnet motor Extremely wide modulation Flux density Power index
CLC: TM341
Type: Master's thesis
Year: 2010
Downloads: 106
Quote: 2
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Abstract


Surface mounted permanent magnet synchronous motor has many advantages, but do not have the ability to self-starting, need to be equipped with special inverter drive device; sine degree of the air-gap magnetic field generated by the existing surface permanent magnet rotor structure is not high, where there are a large number of harmonics , so that the increase in loss of motor, power index fell, unable to realize the energy-saving advantages of permanent magnet synchronous motor; pulsating electromagnetic torque causing the motor running oscillation is generated due to the non-sinusoidal air-gap magnetic field will affect the operational stability and reliability directly limit the use and promotion of the permanent magnet motor. This paper presents a distributed pole array is placed in the permanent magnet motor rotor core surface, ie sinusoidal pole width modulated permanent magnet rotor structure. Through the rational design of a permanent magnet array thickness, width and arrangement, so that the motor the sine degree higher flux density waveform, in order to reduce losses and improve the power index. The gap between distributed magnets with magnetic blocks set guide bars and end rings constitute the starting cage, using this pole array width modulation rotor surface mounted permanent magnet synchronous motor also has a certain amount of self-starting capability. This article first introduces the basic idea of ??the structure of the permanent magnet rotor pole width modulation, such new modulation principle of the permanent magnet rotor structure, then use the analytical method and finite element method analysis of a permanent magnet rotor sinusoidal pole width modulation structure on motor flux density waveform, and the thickness of the permanent magnet, air gap length and shaft material factors such as the influence of the magnetic field of the motor air gap of comparison; Ansoft software while taking advantage of the extremely wide modulation self-start permanent magnet synchronous motor starter process simulation, different the pole width modulation structure program dynamic torque curve and dynamic speed curve, provide a theoretical basis for the design of the modulation start winding. Finally, extremely wide the traditional the en bloc magnet structure and sine modulated structure of permanent magnet rotor permanent magnet synchronous motor prototype programs were designed, developed the prototype of the two structures; build experimental system, voltammetry measurement of new motor synchronous anti parameters, through the air-gap magnetic field waveform of the indirect detection of the buried coil method, verify very wide modulation structure to improve operation and effect of the air gap magnetic field; loss separation method to obtain the test motor operating characteristic curve by the no-load and load test, the motor power index significantly improved energy-saving effect is remarkable. The theoretical analysis, numerical simulation and prototype experiments show that the new surface permanent magnet array width modulation rotor structure with feasibility and practical value.

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Synchronous motor
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