Low Rare Earth Wide Speed ​​Hybrid Permanent Magnet Flux Switching Double Stator Motor

Abstract

The invention discloses a little rare earth type wide speed regulation hybrid permanent magnetic flux switching double stator motor. According to the motor, X outer stator teeth are distributed uniformly and circumferentially on an inner surface of an outer stator, m phases of armature windings and magnetization windings are alternately wound on the X outer stator teeth; q magnetic conduction blocks and q insulation blocks are arranged on an outer circle surface of a rotor support of a middle rotor in a staggered mode; an inner stator comprises an inner stator core and a hybrid permanent magnetic unit, K hybrid permanent magnet units are uniformly embedded in the inner stator core along the circumference direction, each hybrid permanent magnet unit respectively comprises a middle non-rare-earth aluminum nickel cobalt permanent magnet and rare earth neodymium iron boron permanent magnets at two sides of the non-rare-earth aluminum nickel cobalt permanent magnet; a stator partitioning structure is employed, the armature windings and the permanent magnets are separated and are respectively arranged in the outer stator and the inner stator, a problem of mutual limit in quantity of traditional magnetic flux switching motor permanent magnets and armature windings is solved, and motor power density and torque density are easy to improve.

Description

technical field [0001] The invention relates to a magnetic flux switching dual-stator motor, in particular to a low-rare-earth wide-speed-adjustable hybrid permanent magnet flux switching dual-stator motor for electric vehicles, which belongs to the technical field of motor body design. Background technique [0002] Vehicle drive motors are the key power components of electric vehicles. The important indicators for evaluating and measuring the performance of drive motors are high power density, high efficiency (high efficiency in all working planes), high reliability, and wide speed range (> 5 times the base Speed), with frequent start and acceleration and deceleration capabilities, low cost, etc. At present, in the field of vehicle drive motors, rare earth permanent magnet motors with advantages such as high efficiency and high power density are the main choice for new energy vehicles. However, the price of medium and heavy rare earth permanent magnet materials has rise...

AI Technical Summary

Problems solved by technology

However, in order to maintain a high power density, the volume of non-rare-earth permanent magnet materials will be several times that of rare-earth permanent magnet materials, which will inevitably cause space competition problems inside the limited stator or increase the size of the motor.

At the same time, the application of this type of motor in the field of electric vehicles still has the defects that the inherent magnetic field of the permanent magnet cannot be adjusted and the speed regulation range is narrow

In order to realize the effective regulation of the air-gap magnetic field of the magnetic flux switching permanent magnet motor, the hybrid excitation multi-flux switching type automotive hub motor proposed in the document of Chinese patent application number 201310091558.0 and the document of Chinese patent application number 201410344216.X are disclosed In a combined multi-tooth stator core hybrid excitation switching flux motor, the addition of electric excitation windings is used to form a hybrid excitation flux switching motor to achieve the purpose of widening the speed range of the motor, and it can also reduce rare earth permanent magnet materials. However, the mutual coupling of the electric excitation field and the permanent magnetic field of the mixed excitation will easily lead to the high saturation of the local magnetic field of the motor, thus affecting the actual magnetic field adjustment range

It can be seen that when the low-rare-earth hybrid excitation flux switching motor of the prior art is applied to electric vehicles, the rare-earth permanent magnetism can be reduced under the premise of effective adjustment and control of the motor air-gap magnetic field, widening of the motor speed regulation range, and ensuring high-efficiency performance of the motor. There are still problems to be solved in terms of the amount of magnetic materials

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