Dual-stator hybrid permanent-magnet memory motor

Abstract

The invention discloses a dual-stator hybrid permanent-magnet memory motor. The dual-stator hybrid permanent-magnet memory motor comprises a first stator, a second stator, a rotor, an U-shaped statorcore, an Al-Ni-Co permanent magnet and a NdFeB permanent magnet, wherein the stators and the rotor are of salient pole structures, the first stator and the second stator are opposite in positions, therotor is arranged between the two stators, the U-shaped stator core is uniformly wound to form a round shape, the two permanent magnets are embedded between two stator teeth, the NdFeB permanent magnet is near to the rotor, the permanent magnet on the single stator are alternatively magnetized along a circumferential direction, and the magnetization directions of the permanent magnets at oppositepositions of the two stators are opposite. By the dual-stator hybrid permanent-magnet memory motor, the power density of the motor can be effectively improved, the magnetization states of the permanent magnets are changed by applying a pulse current to a magnetic adjustment coil so as to expand a running range of the motor, and the problem of excessively large torque among tooth grooves of the motor is effectively solved.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, in particular to a dual-stator hybrid permanent magnet memory motor. Background technique [0002] Due to its advantages of high efficiency, high power density, and simple structure, permanent magnet motors have been widely used in industries, aerospace, and automobiles. However, due to the limitation of the permanent magnet material itself, it is difficult for the traditional permanent magnet motor to adjust the air gap magnetic field of the motor and expand the speed regulation range of the motor. With the emergence of motor structure and permanent magnet material technology, many household appliances and electric vehicles use permanent magnet motors as drive motors. However, when these motors are running at high speed, the copper consumption of the motor is relatively large, and when the motor is running at low speed, the iron consumption is relatively large. Therefore, in order ...

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Problems solved by technology

However, under the above-mentioned tangential structure, it is not easy to realize; at the same time, the rotor must be treated with magnetic isolation, and the whole rotor is fastened on the shaft by multiple parts, which reduces the mechanical reliability; finally, in the occasion where wide speed regulation is required , such as in machine tools and electric vehicles, the main magnetic flux of the permanent magnet air gap with the above structure is not high, and the power index of the motor is not satisfactory.

[0005] Although the stator permanent magnet flux switching permanent magnet motor has been favored by scholars at home and abroad because of its advantages such as high power density, high efficiency, no-load flux linkage bipolarity, high sine degree of no-load induced electromotive force, and simple structure and high reliability. It has been widely concerned, but there are hysteresis loss and eddy current loss in the rotor core of flux switching permanent magnet motor, and the air gap magnetic field is generated by permanent magnet excitation, which is difficult to adjust, which limits its application in wide speed regulation occasions

[0006] The team of Professor Lin Heyun of Southeast University proposed an axial magnetic field stator split flux switching memory motor. Although the motor can realize the adjustable air gap magnetic field of the motor, the motor only uses AlNi with relatively low coercive force alone. Cobalt permanent magnets, the maximum air gap flux of the motor is difficult to reach the level of NdFeB permanent magnet motors, and the power index of the motor is not satisfactory; or in order to obtain sufficient flux, thicker permanent magnet materials must be used, and The magnetic flux of magnetization and demagnetization passes through the air gap of the motor, which leads to a larger magnetomotive force of the magnetic modulation pulse and increases the winding capacity

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