Sectional five-phase permanent magnet motor rotor structure with unequal number of magnetic poles

Abstract

The invention discloses a segmented five-phase permanent magnet motor rotor structure with unequal magnetic pole numbers. The structure comprises a central rotating shaft, N sections of rotor units with 2p magnetic pole numbers and N + 1 sections of rotor units with 6p magnetic pole numbers, the two groups of rotor units are alternately sleeved along the axial periphery of the central rotating shaft, the axial lengths of the rotor units with the same magnetic pole numbers are equal and along the axial direction of the central rotating shaft. The numbers of the 2N + 1 sections of rotor units are 0, 1, 2,..., 2N in sequence, the included angle between the magnetic pole center lines of the 0 section and the first section of rotor unit is alpha, the included angle between the magnetic pole center lines of the adjacent sections of the N sections of rotor units with the magnetic pole number of 2p is theta 1, and the included angle between the magnetic pole center lines of the adjacent sections of the N + 1 sections of rotor units with the magnetic pole number of 6p is theta 2. According to the invention, the forward torque can be generated by fully utilizing the rotor permanent magnet and the third harmonic magnetic field generated by the third harmonic current on the armature winding, and the torque density of the motor is improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet clicks, and in particular relates to a five-phase permanent magnet motor rotor structure with segmented and unequal numbers of magnetic poles. Background technique [0002] Five-phase permanent magnet synchronous motor has the dual advantages of permanent magnet synchronous motor and multi-phase motor. It not only has high torque density, high efficiency and low torque ripple, but also has strong fault tolerance and low capacity requirements for a single power device. . It has been widely concerned in high-power and fault-tolerant operation occasions such as aerospace, rail transit, and wind power generation. As a new type of winding structure, the fractional slot concentrated winding has similar poles and slots, and the winding pitch is 1. The end of the motor winding is shorter, which not only saves copper, but also facilitates modular production. In the five-phase motor, the slot and...

AI Technical Summary

Problems solved by technology

[0003] Due to the influence of the slotting of the stator, the permanent magnet synchronous motor will produce cogging torque, which makes the output torque of the motor pulsate and reduces the stability of the motor; secondly, because a single permanent magnet is too long, it is easy to be damaged during the assembly process

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