A micro motor

The oil-containing bearing and mechanical positioning technology with integrated end cover bearing design solve the problems of difficult and high cost assembly of micro motors, and realize the design of micro motors with high reliability, low noise and long life.

CN113922561BActive Publication Date: 2025-09-19SHANGHAI MOONS ELECTRICAL APPLIANCE
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Patent Information

Application Number
CN202110869752.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-07-30
Publication Date
2025-09-19
Estimated Expiration
2041-07-30

AI Technical Summary

Technical Problem

Existing micro motor designs have problems such as high manufacturing and assembly costs, bearing space limitations, large assembly errors, high noise, and short lifespan. In particular, the sliding bearing design increases assembly difficulty and scrap rate.

Method used

The oil-containing bearing with an integrated end cover bearing design is combined with the front oil-containing bearing and the rear oil-containing bearing. Mechanical positioning is used to ensure the alignment of the zero crossing point of the electrical signal and the zero crossing point of the Hall signal, eliminating the phase adjustment step. An external oil storage space is provided in the bearing to achieve an interference fit between the bearing and the housing.

Benefits of technology

It simplifies the assembly process, reduces manufacturing costs and noise, increases motor life and assembly qualification rate, reduces friction loss and noise, and enhances the durability and reliability of the motor.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention relates to a micromotor comprising a stator assembly, a rotor assembly, a bearing system, and a Hall assembly. The bearing system comprises a front oil-containing bearing and a rear oil-containing bearing, both of which are integrated with the end cap bearing. The first positioning hole of the front oil-containing bearing is aligned with the centerline of the zero-crossing point of the back-electromotive force signal of the stator assembly, and then the bearing is pressed into the stator assembly, which is then installed into the rotor assembly. The second positioning hole of the rear oil-containing bearing is aligned with the positioning hole of the front oil-containing bearing, and then the bearing is pressed into the corresponding position of the stator assembly. The Hall assembly is mounted on the rear oil-containing bearing, and the Hall bracket positioning column of the Hall assembly is inserted into the positioning hole of the rear oil-containing bearing and then axially installed in place. Compared with the prior art, the present invention has the advantages of stable support, high reliability, compact structure, high performance, long life, and low cost.
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Citation Information

Patent Citations

  • Sliding bearing for integrated high-speed motor

    CN109586491A

  • Brushless direct current motor

    CN111641279A

  • Motor

    CN206727836U

  • Micro motor

    CN215772766U