Star polygonal winding with m-phase power sources for asynchronous motor

Abstract

The invention relates to a star polygonal winding with m-phase power sources for an asynchronous motor. The technical scheme includes that the star polygonal winding is totally provided with 2m branchcircuits when seen from the inside of the motor, order v of magnetic potential space harmonic waves of the star polygonal winding meets an equation of v=4*k*m+1, wherein the k is a positive or negative integer including zero, for example, the star polygonal winding is provided with 6 branch circuits when seen from the inside of the motor if the m is equal to 3, the v can be 1, -11, +13, -23, +25and the like, and the star polygonal winding is equivalent to a 12-phase winding; the star polygonal winding is provided with 10 branch circuits when seen from the inside of the motor if the m is equal to 5, the v can be 1, -19, +21, -39, +41 and the like, and the star polygonal winding is equivalent to a 20-phase winding; the star polygonal winding is provided with 12 branch circuits when seen from the inside of the motor if the m is equal to 6, the v can be 1, -23, +25, -47, +49 and the like, and the star polygonal winding is equivalent to a 24-phase winding. The star polygonal winding has the advantages that the star polygonal winding is a 4m-phase system when seen from the inside of the motor and is an m-phase system when seen from the outside of the motor, accordingly, harmonic components can be reduced to a great extent by the winding in the connection, vibration, harmonic torque and stray loss can be reduced, noise can be lowered, effective materials can be saved, and the star polygonal winding has a practical engineering application value; harmonic currents can be injected into the asynchronous motor with the winding in the connection when fundamental currents are fed intothe asynchronous motor, accordingly, the ferromagnetic saturation of the asynchronous motor can be reduced, and the torque density of the asynchronous motor can be increased.

Description

Technical field [0001] The invention relates to the technical field of motors, in particular to a star polygon winding of an asynchronous motor whose power supply is m-phase. Background technique [0002] Asynchronous motors have inherent advantages such as simple structure, good mechanical strength, reliable operation, and convenient maintenance. The rapid development and maturity of power electronic power devices and modern drive technology have made up for their shortcomings in starting and speed regulation performance. The motor has become the most widely used motor currently. The status of the three-phase asynchronous motor has been challenged to a certain extent, which is manifested in three aspects. The first challenge is related to the high-power speed control system with a rated capacity of several megawatts. The high-power motor speed control system is widely used in fans, pumps, compressors, cement mills, rolling mills, mine hoists and other occasions. The second cha...

AI Technical Summary

Problems solved by technology

The second challenge appears in the field of low-power speed regulation, and we can see two development trends that are slightly emerging

The third challenge arises in the field of integrated frequency control system

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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