A hollow cup brushless motor protected by injection molding

Abstract

The invention relates to a hollow cup brushless motor protected by injection molding, belonging to the technical field of special motor, which is composed of a cup-shaped outer rotor, an inner statorand a shaft, and is characterized in that the stator punching pieces of the inner stator are provided with a plurality of aligned riveting holes, and the stator iron core is riveted and assembled by using rivet holes; Chamfered groove edges of stator cores are immersed in paint and dried; The enameled wire has a rectangular cross section, and is inserted into the stator groove after the enameled wire is formed into a U shape. The stator coil is treated by an injection molding process in which a glass fiber reinforced polybutylene terephthalate is injected into an injection mold by a press, andthe mass ratio of the glass fiber reinforced polybutylene terephthalate to the glass fiber reinforced polybutylene terephthalate is 10%-40% glass fiber reinforcements, preferably 30%. After cooling,glass fiber reinforced polybutylene terephthalate (GFRP) is finally solidified into thermally conductive curable plastics (TCP). The technology of the invention enables the stator to be highly reliable, and the stator is resistant to hot water, alkali, acid, oil, and short circuit caused by vibration between the enameled wires is avoided.

Description

technical field [0001] The invention relates to a hollow cup brushless motor protected by injection molding, which belongs to the technical field of special motors. Background technique [0002] The coreless brushless motor breaks through the rotor structure of the traditional motor in structure, and adopts the ironless rotor. Coreless brushless motor rotor has low moment of inertia, no cogging, low friction and very compact commutation system, these advantages will bring faster acceleration, higher efficiency, lower Joule loss and greater continuous rotation moment. [0003] Coreless brushless motors are ideal for applications such as portable or small devices due to their overall small size, reduced weight and reduced heat generation. This allows for greater motor performance in a smaller frame size for greater comfort and convenience. In addition, in battery-powered applications such as automobiles, coreless brushless motors can extend the life of the equipment and imp...

AI Technical Summary

Problems solved by technology

However, this method only involves how to pour, and has no enlightenment on winding, silicon steel sheet, pouring formula and curing process

[0006] Existing motors will generate a lot of heat when they are running. When the heat is transferred to the stator and the casing, it will cause different expansion degrees between the stator and the casing. In addition, there will be more or less gaps between the coils when they are wound. If there is looseness between them, the stator coil will vibrate during the operation of the motor, which is prone to insulation failure and short circuit

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