Rotor magnetic pole modulation type bypass hybrid excitation motor

Abstract

The invention discloses a rotor magnetic pole modulation type bypass hybrid excitation motor, which comprises a stator, a magnetic pole modulation type rotor, a static magnetic conductive ring and a direct current excitation winding, the magnetic pole modulation type rotor comprises an S iron core pole module, an N iron core pole module and a permanent magnet; iron cores in the iron core poles are all formed by laminating laminations along the axial direction; the rotor comprises k rotor units which are arranged along the circumferential direction; each rotor unit comprises n permanent magnet pole pairs and n+1 iron core pole pairs; and an air gap is formed between the static body and the rotating body. A magnetic pole modulation type rotor is adopted, and brushless excitation is achieved in a bypass (axial additional magnetic circuit) mode. The additional magnetic circuit only provides a low-magnetic-resistance path for the electro-magnetic flux, the magnetic flux generated by the permanent magnet pole is closed with the stator teeth through the air gap between the stator and the rotor (namely effective magnetic flux), additional magnetic leakage is avoided, and the utilization rate of the permanent magnet material is high. Meanwhile, the iron core of the rotor pole is formed by laminating the laminations along the axial direction, so that the eddy current loss can be reduced.

Description

technical field [0001] The invention relates to the field of motor design and manufacture, in particular to a rotor magnetic pole modulation bypass type hybrid excitation motor. Background technique [0002] Permanent magnet motors have the advantages of high torque / power density, high efficiency, and high power factor, and have been used in many applications such as household appliances and electric vehicles. However, in the case of driving in a wide speed range, the permanent magnet motor is controlled by the direct axis current component in the armature winding (- i d ) to realize the field-weakening expansion, which increases the risk of irreversible demagnetization of the permanent magnet, and the high reluctance characteristics of the permanent magnet limit the field-weakening capability. In the case of constant voltage power generation, the permanent magnet motor needs a full-power controllable converter to stabilize the output voltage. [0003] The hybrid excitati...

AI Technical Summary

Problems solved by technology

Although their additional magnetic circuit provides a low reluctance path for electrical excitation, it also provides a flux leakage (flux leakage: flux that does not pass through the air gap and stator tooth closure) path for the permanent magnet flux, reducing the permanent magnet material Utilization of

Moreover, most of the additional magnetic circuits are solid magnetic conductive parts, which increases the eddy current loss

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