Magnetic shoe structure of direct-current micromotor

Abstract

A magnetic shoe structure of a direct-current micromotor comprises a magnetic shoe body, wherein an inner cambered surface and an outer cambered surface of the magnetic shoe body are concentric; and two R corners are respectively arranged at two ends of the outer cambered surface. The magnetic shoe structure of the direct-current micromotor is characterized in that two flat sections are oppositely arranged on the outer cambered surface inwards along the inner ends of the two R corners, and are symmetrical to each other; and a gap is formed between each flat section and an lengthened surface of an arc-shaped surface in the middle of the outer cambered surface. The vertical distance L between the outer end of each flat section and the arc-shaped lengthened surface of the outer cambered surface is 7%-8% of a distance L1 between the outer cambered surface and the inner cambered surface. The arc length l1 of the arc-shaped surface in the middle of the outer cambered surface is 75%-78% of the whole arc length of the outer cambered surface. By the magnetic shoe structure, the increasing degree of current of the micromotor is reduced under the condition that the load speed of the micromotor is greatly increased, and moreover, noise can be reduced.

Description

technical field [0001] The invention relates to a magnetic tile structure of a motor, in particular to a magnetic tile structure of a DC micro-motor. Background technique [0002] The magnetic tile structure used as the stator of the existing DC micro-motor is the following two structures: 1) the concentric magnetic tile, the inner arc Ra and the outer arc surface Rb all take O as the center of the circle, that is, the wall thickness is equal thickness, so The air gap between the rotor and the stator of the micromotor is as large as figure 1 shown in . 2) For eccentric magnetic tiles, the inner arc Ra and the outer arc surface Rb are centered at Oa and Ob points respectively, that is, the wall thickness is the thickest in the middle and slightly thinner at both ends, such as figure 2 shown in . The former one has higher noise and lower load speed. The latter type has lower noise, but the load speed still does not meet the high-end requirements, and the load current will...

AI Technical Summary

Problems solved by technology

The former one has higher noise and lower load speed

The latter type has lower noise, but the load speed still does not meet the high-end requirements, and the load current will be too large, which makes it difficult to meet higher environmental protection requirements

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