Stepped partition self-magnetic-adjustment stepless speed regulation system and method based on rotor magnetic pole modulation

Abstract

The invention discloses a stepped partition self-magnetic-adjustment stepless speed regulation system and method based on rotor magnetic pole modulation. The system comprises a rotor magnetic pole modulation type hybrid excitation motor, an inverter, a power supply, a stepped reactive excitation device and a switching assembly. The rotor magnetic pole modulation type hybrid excitation motor comprises a stator, an excitation winding, an armature winding and a magnetic pole modulation type rotor. The excitation winding is wound in the stator and is an alternating current winding; the armature winding is connected with a power supply through an inverter; the stepped reactive excitation device comprises a plurality of stages of reactive devices which are arranged in parallel, and the phase number of each stage of reactive device is equal to the phase number of the excitation winding; and the excitation winding can be conducted with any stage of reactive power device through the switching assembly. Only a power supply and a power converter at the armature winding end are needed. A power supply and a power converter are omitted at the excitation winding end, and stepped partition self-magnetic adjustment is achieved through the stepped reactive excitation device.

Description

technical field [0001] The invention relates to the field of motor design and manufacture, in particular to a system and method for stepwise partition self-regulating magnetic stepless speed regulation based on rotor magnetic pole modulation. Background technique [0002] Permanent magnet motors have the advantages of high torque / power density, high efficiency and high power factor, and have been applied in many occasions. However, field weakening of PM motors is achieved by controlling the direct axis current component in the armature winding (- i d ) to achieve, the permanent magnet has the risk of irreversible demagnetization, and the weakening capacity is limited. [0003] The hybrid excitation motor has two magnetic potential sources (excitation winding and permanent magnet), which not only has the advantages of convenient adjustment of the magnetic field of the electric excitation motor, but also has the advantages of high power density and high efficiency of the per...

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Problems solved by technology

The permanent magnetic flux will be short-circuited through the additional magnetic circuit, forming magnetic flux leakage and reducing the utilization rate of permanent magnetic materials

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

[0005] In addition, when the existing hybrid excitation motor is used in the speed control system, an additional power supply and power converter are required to supply power to the field winding

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