Brushless double-fed motor

Abstract

The invention belongs and relates to the technical field of motors, in particular to a brushless double-fed motor. The key is that the turns of coils in the largest slot number set are symmetrically distributed according to an arched pattern: the turns of outward coils of the innermost layer are first rapidly increased and then decreased gradually. According to the tooth harmonic theory, the rotor windings of the present equal turns are changed that the coils in the largest slot number set of the rotor winding which are symmetrically distributed according to the arched law, so that the higherharmonic of the rotor magnetic motive force is reduced; the rotor windings using the coil distribution method can realize the couplings between a power winding P1 and a control winding P2 of a statorand the rotor windings well; and the air-gap dense harmonic content is lower.

Description

A brushless doubly-fed motor technical field The invention relates to the technical field of motors, in particular to a brushless double-fed motor. Background technique If the brushless double-fed motor wants to have better performance, the key lies in the rotor. In recent years, the rotor structures of brushless double-fed motors mainly include reluctance rotors and special cage rotors. The working principle is that the two pole logarithmic magnetic fields generated by the stator windings can simultaneously generate induced potentials in the same rotor circuit. At present, it is believed that the bottleneck restricting the practical application of brushless doubly-fed motors lies in the performance of the rotor windings. The special cage rotor is considered to be the most likely to be applied to large-capacity motors, but the existing special cage rotor windings are designed according to the "conjugate" principle, that is, the two poles of the rotor required for the brus...

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Problems solved by technology

The special cage rotor is considered to be the most likely to be applied to large-capacity motors, but the existing special cage rotor windings are designed according to the "conjugate" principle, that is, the two poles of the rotor required for the brushless doubly-fed motor , the design retains the cage conductors whose induced potentials are in the same phase under the two numbers of poles, and removes the cage conductors of different phases, which will inevitably lead to low utilization of the rotor conductors and large harmonic content, resulting in low operating efficiency of the motor. Good realization of brushless doubly-fed motor rotor requirements

The existing special cage rotor winding usually adopts two winding methods, one is that the coils have equal span and the number of turns is distributed equally, and the other is that several groups of concentric and equal turns are distributed, and the span of the two winding methods is Neither the span nor the number of turns can flexibly change the coil span and number of turns according to the harmonic principle, so there are many coils with different phases of induced potentials between the rotor winding and the stator's power winding P1 and control winding P2, so the high-order magnetic The percentage of momentum harmonics is large, and the corresponding rotor winding harmonic leakage reactance is also large

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