30-slot 14-pole fractional slot double-layer short-pitch distribution winding fifteen-phase permanent magnet synchronous motor

Abstract

The invention discloses a 30-slot 14-pole fractional-slot double-layer short-distance distribution winding 15-phase permanent magnet synchronous motor. Fifteen phase windings are divided into three groups. The axes of five phase windings in one group are separated from one another for 72 DEG, and the five phase windings are connected for forming a five-phase star-connected symmetrical winding. The axes of the five-phase star-connected symmetrical windings which correspond with one another in the three groups are successively shifted by 12 DEG. Three natural points in the three groups of five-phase star-connected symmetrical windings are not connected with one other. The number of slots on each phase of each pole is a fractional number. The span of each coil is 2 slots. The end of the coil is relatively short, thereby saving copper and realizing small copper consumption amount. When a fundamental wave current is input into each star-connected symmetrical winding, a third harmonic current of which the amplitude is one sixth of the amplitude of the fundamental wave current can be simultaneously input. After the third harmonic current is input, not only is current amplitude of a power switch tube reduced, but also ferromagnetic saturation of the motor is reduced, and furthermore ferromagnetic material utilization rate and torque density are improved. A large-power low-speed permanent-magnet synchronous motor which is composed of a plurality of unit motors has advantages of high efficiency and relatively low vibration noise.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and relates to a 30-slot, 14-pole, 15-phase permanent-magnet synchronous motor whose stator winding is in the form of fractional-slot double-layer short-distance distributed windings. Background technique [0002] Since the multi-phase motor has more phases than the three-phase motor, it can realize low-voltage high-power drive, small torque ripple, high power density, high reliability, and fault-tolerant operation after phase failure. Multi-phase electric motors have been used more and more in occasions such as naval ship propulsion systems that require high performance and high reliability propulsion systems. For a five-phase motor, the third harmonic current that has a specific corresponding relationship with the fundamental current can be injected into the current. Since the amplitude of the stator phase current at this time is lower than that of the pure fundamental current, the current...

AI Technical Summary

Problems solved by technology

In the actual multi-phase permanent magnet synchronous motor design, there are many fractional harmonics in the magnetomotive force of the fractional slot concentrated winding. In some cases, they may interact with the main pole magnetic field to generate some disturbance force. When some disturbance force When the frequency coincides with the natural vibration frequency of the stator frame, it will cause resonance and cause the stator core to vibrate

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