Motor and its end cover assembly

By arranging the capacitor near the magnetic core in the brushed motor end cover assembly and forming a curved structure consistent with the inductor current, the electromagnetic interference problem caused by the excessively long connecting wires between the inductor and capacitor is solved, and effective suppression is achieved in the high-frequency range.

CN112467919BActive Publication Date: 2025-09-30JOHNSON ELECTRIC GUANGDONG CO LTD
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Patent Information

Application Number
CN201910843269.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2019-09-06
Publication Date
2025-09-30
Estimated Expiration
2039-09-06

AI Technical Summary

Technical Problem

In the end cover assembly of the existing brushed motor, the connecting wires between the inductor and the capacitor are long, resulting in the inability to effectively suppress electromagnetic interference in the high-frequency range.

Method used

The capacitor is placed near one end of the magnetic core to form a curve or broken line structure with an opening consistent with the flow direction of the inductive current, reducing the length of the connecting line and offsetting the equivalent series inductance magnetic field of the capacitor through the inductor part to suppress electromagnetic interference.

Benefits of technology

This effectively reduces the length of the connecting wire between the capacitor and the inductor, lowers the equivalent series inductance, and further suppresses electromagnetic interference.

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Abstract

The present invention relates to the field of motor technology and discloses a motor end cap assembly comprising an end cap, a capacitor fixed to the end cap, and a brush, an inductor, and a power terminal connected in series. The capacitor comprises a main body, the main body comprising two electrodes, and a dielectric located between the two electrodes. The capacitor is arranged adjacent to one end of the magnetic core, and the main body of the capacitor at least partially overlaps with the longitudinal extension of the magnetic core. At least a portion of the first and second connecting terminals, together with the capacitor, form a curved or broken line structure with an opening that is consistent with the current flow direction of the inductor, and the plane on which the main body or the curved or broken line structure with an opening is located faces the end of the magnetic core. The end cap assembly of the present invention can effectively suppress electromagnetic interference. The present invention also discloses a motor comprising the end cap assembly.
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