A three-phase single-layer winding motor with a span of 2

Abstract

The invention discloses a three-phase single-layer winding motor with a span of 2, comprising a stator, a rotor, an excitation device and an armature winding, wherein the armature winding is a three-phase symmetrical alternating current winding, the winding form is a single-layer winding with a span of 2, the coil side of only one coil is disposed in each stator slot, and the overlapping portionsof the end parts of the coils are discontinuous; and the number Ns of the stator slots is a multiple of 12. The three-phase single-layer winding motor disclosed by the invention can effectively improve the short distance coefficient and the winding coefficient of the motor with a pole-to-slot ratio close to 1:2, improve the fundamental wave amplitude and the torque density of the no-load induced electromotive force of each phase, and reduce the difficulty of the wire embedding and insulation process of the winding, and reflect the superiority of the advantages of the three-phase single-layer winding motor with the span of 2.

Description

technical field [0001] The invention belongs to the field of motor winding design, in particular to a three-phase single-layer winding motor with a span of 2. Background technique [0002] Generally speaking, the armature winding is located on the stator of the motor. When the rotor rotates, the rotating magnetic field will generate an induced electromotive force in the armature winding, which interacts with the current in the armature winding to generate torque. The more commonly used armature winding structures include single-layer winding, double-layer winding, concentrated winding, distributed winding, overlapping and non-overlapping winding and their combined structure. The appropriate winding structure should be selected in the design selection of armature winding. [0003] The choice of winding structure will affect the insulation ability between different coils on the one hand, and on the other hand, it will affect the difficulty of embedding wires. At the same time...

AI Technical Summary

Problems solved by technology

[0005] 1) The winding is a double-layer winding, and there are two coil sides with different phases in each slot, which increases the difficulty of interphase insulation, and also increases the mutual inductance between different coils, reducing the fault tolerance of the coil winding

[0006] 2) The span of each coil is fixed at 1. In the case of some special pole-slot ratios, such as when the pole-slot ratio is close to 1:2, if double-layer concentrated winding is used, the short-pitch coefficient is close to 0.5 , so that the distribution coefficient becomes lower, which will greatly reduce the amplitude of the fundamental wave of the induced electromotive force of the winding and the torque density of the motor, reducing the performance of the motor

On the one hand, it will increase the amount of copper wire and increase the copper loss of the winding

On the other hand, overlapping ends of out-of-phase increases the mutual inductance

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