Multi-phase electric motor equipped with polygonal winding

Abstract

The invention discloses a multi-phase electric motor equipped with a polygonal winding, and belongs to the technical filed of a motor. The winding is designed, and when the power supply phase number mis an odd number and when a 180-degree/m phase band is adopted, the magnetic potential space harmonic number of times is v which is equal to 4km+1, wherein k is a positive or negative integer comprising zero; for example, when m is equal to 3, and when the 180-degree/m phase band is adopted, v is equal to 1, -11, +13, -23, +25 and so on based on the same rule, and a 12-phaes winding is formed equivalently; and when m is equal to 5, and when the 180-degree/m phase band is adopted, v is equal to 1, -19, +21, -39, +41 and so on based on the same rule, and a 20-phaes winding is formed equivalently. Seem from the interior of the motor, a 4m-phase system is formed while seem from the exterior of the motor, an m-phase system is formed; by virtue of the winding in the connection method, the harmonic ingredients can be greatly lowered, and vibration, noise, harmonic torque and stray loss can be reduced while effective material can be saved, an actual engineering application value can be achieved; when the electric motor in the winding connection method is pumped with a fundamental current, a harmonic current also can be injected at the same time; and after the harmonic current is injected, the ferromagnetic saturability of the electric motor can be reduced while the torque density of the electric motor is also improved.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a multi-phase motor with polygonal windings. Background technique [0002] The electric motor has the advantages of simple structure, reliable operation, convenient maintenance, etc., and the increasingly mature high-power power electronic technology has made up for its deficiencies in starting and speed regulation performance. With the development of comprehensive power technology for ships, large-capacity electric motors It has become the preferred motor for ship electric propulsion, and the importance of multi-phase motors has become increasingly prominent. The original purpose of the development of multi-phase motors is to solve the problem of low-frequency pulsation of the output torque of three-phase motors, because the frequency of torque pulsations increases with the increase of the number of motor phases; secondly, to improve the reliability of the system, and With the i...

AI Technical Summary

Problems solved by technology

Under the power supply of the frequency converter, the motor is usually powered by a non-sinusoidal wave, so the traditional sine-wave power supply cannot be used for research

In addition, as more and more harmonic sources are applied to the power system, the voltage waveform distortion rate in the power grid will also increase, which will cause harm to the normal operation of the power system and electrical equipment

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