A dual-stator field-modulated permanent magnet motor suitable for electric tractors

Abstract

The invention discloses a dual-stator magnetic field modulation permanent-magnet motor applicable to a motor tractor. Multiple groups of permanent magnet modules are uniformly and fixedly embedded into an intermediate rotor along a circumferential direction, each group of permanent magnet module comprises two permanents which are arranged in a V-shaped mode and are not contacted, one of V-shaped openings in two adjacent groups of permanent modules faces inwards along a radial direction, the other one V-shaped opening faces outwards along a radial direction, air magnetic obstacles are arrangedin both of an inner side and an outer side of each permanent magnet, a plurality of outer trapezoid grooves are formed in an outer circle of the intermediate rotor along a circumferential direction, aplurality of inner trapezoid grooves are formed in an inner circle along a circumferential direction, the outer trapezoid grooves are formed in outer sides, facing outwards in a radial direction, ofthe V-shaped openings, and the inner trapezoid grooves are arranged at inner sides of two permanent magnets, facing inwards in the radial direction, of the V-shaped openings. On the basis of a magnetic field modulation principle, the energy distribution of a motor magnetic field for the motor tractor is changed by mutual matching of the V-shaped permanent-magnet topological structure, the air magnetic obstacles and the inner trapezoid grooves and the outer trapezoid grooves of the intermediate rotor, the effective harmonic content of an air gap magnetic field is improved, and the output torqueand the power factor are improved.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motor manufacturing, in particular to a double-stator permanent magnet motor based on the magnetic field modulation principle, which is suitable for electric tractors. Background technique [0002] Agricultural electric tractors have attracted attention due to their characteristics of zero emission and low noise. In the power system of electric tractors, the motor is often used as the core component of energy conversion, and its performance is directly related to the energy conversion efficiency and reliability of the system. In order to meet the needs of electric tractors for complex farming operations, the motors of the electric tractor power system need to be able to output relatively large torque under low-speed operating conditions. At present, in traditional industrial occasions that require low speed and high torque, most of them use ordinary speed motors plus mechanical gear boxes...

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Problems solved by technology

Chinese patent application number 201711308185.2 proposes a new type of magnetic gear that conforms to the topology of the traditional permanent magnet motor. Through the combination of permanent magnets with different polarization directions, the magnetic circuit of the magnetic gear motor on the stator is constructed, so that The magnetic circuit is more efficient and reasonable, which reduces the flux leakage of the motor while achieving low-speed and high-torque output, thereby improving the overall torque density and efficiency of the composite motor. However, this magnetic gear composite motor has a three-layer air gap structure and Two rotating parts, the mechanical structure is relatively complicated, which increases the difficulty of motor processing and manufacturing

In the literature with the Chinese patent application number 201210539414.2, a magnetism-concentrating stator permanent magnet type vernier motor is proposed. In this vernier motor, by introducing modulation teeth into the stator structure, the stator armature has fewer poles and slots. Under the current situation, various harmonic components of the magnetic field generated by the magnetic field modulation effect are used to significantly increase the torque density of the motor. Power factor tends to be low

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