An axial flux motor stator

Abstract

The invention discloses an axial flux motor stator, which includes a plurality of segmented iron cores, each segmented iron core includes a laminated iron core and an SMC soft magnetic sleeve, and the SMC soft magnetic sleeve includes a No. 1 SMC soft magnetic sleeve and a No. 2 SMC soft magnetic sleeve. SMC soft magnetic sleeve, and the structure of No. 1 SMC soft magnetic sleeve and No. 2 SMC soft magnetic sleeve is the same, and the No. 1 SMC soft magnetic sleeve and No. 2 SMC soft magnetic sleeve are spliced ​​and covered on the laminated iron core The outer circumference, the coil is directly wound on the outer circumference of the SMC soft magnetic sleeve. In the present invention, the outer periphery of the stator which is not easy to process is composed of an easy-to-form SMC soft magnetic sleeve, and the main magnetic circuit of the stator is composed of laminated iron cores. While ensuring the performance of the motor, it also reduces the difficulty of processing the motor.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a stator structure of a motor. Background technique [0002] Usually, the stator includes a set of coils each perpendicular to the axis of the motor. The rotor carries a set of permanent magnets and is fixed on the bearing. The magnetic field generated by the stator coils interacts with the magnetic field generated by the permanent magnets to drive the rotor to rotate around the axis of the motor. Figure 1a The basic structure of the axial flux motor is shown, and a pair of rotors R1 and R2 are arranged on both sides of the stator S. It can be seen that there is an air gap G between the rotor and the stator, and the direction of the magnetic flux passing through the air gap G in the axial flux motor is basically axial. [0003] based on Figure 1a According to the basic structure of "single stator-double rotor" in the paper, the axial flux motor has various structural...

AI Technical Summary

Problems solved by technology

But there are two problems. One is that the laminated iron core does not contain pole shoes, and the pole shoes of the segmented iron core are completely composed of SMC iron cores. Generally speaking, the unsaturated relative permeability of the laminated iron core is above 4000, and the SMC iron core The relative magnetic permeability is only 500. According to the motor design experience, the size and magnetic permeability of the pole piece have a great influence on the torque output capability of the motor. This manufacturing method will lead to a decrease in the motor torque output and an increase in the stator loss.

The second problem is the design of the SMC embedded groove. If the embedded groove penetrates, the SMC core cannot axially fix the laminated iron core. If the embedded groove does not penetrate, the air gap magnetic density will decrease, because the SMC core The relative magnetic permeability is small

[0006] In addition, the YASA structure saves the stator yoke, which significantly reduces the weight and iron loss of the stator, and improves the power density and efficiency, but the disadvantage is that it loses the rigid structure that can install bearings to support the rotor

[0007] The Chinese patent application with the application number 201680005613.1 discloses a method for fixing the segmented iron core. The segmented iron core is fixed in the middle of two circular brackets. The ring bracket contains internal grooves (not penetrating) to accommodate the pole pieces of the segmented iron core. This fastening method is strong and stable, but can result in an excessively large air gap

[0008] In the Chinese patent application with the application number 201811595643.X and the application number 201810024841.4, the method of fixing the segmented iron core in the middle of the two circular brackets is still adopted. The fixing groove of the circular bracket adopts a through structure, and there are Protrusions, the size of the protrusions on both sides is smaller than the middle and fits the fixing groove. This fixing method will not affect the size of the air gap, but the segmented iron core has no pole shoes, resulting in a decrease in the torque output capacity of the motor

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