An AC-D axis reluctance controllable permanent magnet brushless motor

Abstract

The invention discloses an AC-D axis reluctance controllable permanent magnet brushless motor in the field of motor manufacturing. The outermost part is a stator core, and 8 groups of hybrid permanent magnets are evenly embedded in the rotor core along the circumferential direction, and each group of hybrid permanent magnets is It consists of 2 NdFeB permanent magnets and 6 AlNiCo permanent magnets, each NdFeB permanent magnet is embedded with 3 AlNiCo permanent magnets, and each group of mixed permanent magnets is arranged symmetrically with respect to the direct axis. A magnetic bridge is formed between two NdFeB permanent magnets in the hybrid permanent magnet. The adjacent two sets of hybrid permanent magnets are arranged symmetrically with respect to the quadrature axis. Each NdFeB permanent magnet and AlNiCo permanent magnet are circular Arc-shaped structure, each NdFeB permanent magnet is embedded with 3 pieces of AlNiCo permanent magnets on one end close to the cross axis, and 3 pieces of AlNiCo permanent magnets are 1 piece in each layer along the radial direction; in the adjacent two groups The rotor core between the hybrid permanent magnets is provided with internal and external multi-layer magnetic barriers distributed symmetrically about the quadrature axis, and the variable permanent magnet torque is generated through the joint action of the two types of permanent magnets.

Description

technical field [0001] The invention belongs to the field of motor manufacturing, and relates to a permanent magnet brushless motor, which is used to drive a hybrid vehicle and a pure electric vehicle, in particular to a high-torque permanent magnet brushless motor with controllable reluctance of an AC-D axis. Background technique [0002] The development of hybrid electric vehicles and pure electric vehicles is accelerating, and the performance requirements of vehicle drive motors are gradually increasing. The traditional permanent magnet brushless motor is widely used in the drive system of electric vehicles due to its simple structure, high power density, and strong reliability. Since the permanent magnet brushless motor uses a single permanent magnet such as NdFeB as the excitation source, it has a constant air gap magnetic field and a narrow field-weakening speed range. It is very important to increase the torque and widen the speed range of the motor. [0003] Existi...

AI Technical Summary

Problems solved by technology

Although the reluctance motor has the advantages of low cost and low loss, its torque density and speed range are difficult to meet the needs of electric vehicles

The motor disclosed in the document of Chinese Patent Publication No. CN109450211A forms a permanent magnet-assisted synchronous reluctance motor through a built-in permanent magnet in a tangential slot in a U-shaped slot. Although this type of motor utilizes reluctance torque and permanent magnet rotation The torque can improve the torque density, efficiency, etc., but there are problems such as non-adjustable torque and narrow operating range of the motor.

Chinese patent No. 200810023409.X proposes a flux-memory stator permanent-magnet motor that uses DC magnetized windings and AlNiCo permanent magnets to cooperate with each other to achieve wide speed regulation. Current and small weak magnetic current widen the speed range, but due to the additional winding for online adjustment of the air gap magnetic field strength, the motor space utilization rate is low and the power density is reduced

In addition, the permanent magnet magnetic energy product used in the permanent magnet memory motor is low, and the permanent magnet operating point is easily affected by the magnetic field of the armature winding, resulting in low air gap main flux

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