Methods for operating electric motors

By adjusting the correction factor of the time parameter during pulse width modulation, the problem of EMC interference in motors was solved, achieving electromagnetic compatibility improvement without the need for additional filters, and reducing cost and space requirements.

CN122374971APending Publication Date: 2026-07-10BROSE FAHRZEUGTEILE GMBH & CO KG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BROSE FAHRZEUGTEILE GMBH & CO KG
Filing Date
2024-12-09
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

In the prior art, electromagnetic compatibility interference (EMC interference) generated by pulse width modulation operated motors can impair the normal function of other electronic devices in the vehicle electrical system. Furthermore, existing filtering methods increase cost and structural space requirements, and cannot completely attenuate individual frequencies of current ripple.

Method used

By adjusting time parameters such as pulse duration, pulse position, and period duration using correction factors during pulse width modulation, the amplitude spectrum of the current ripple is altered, shifting the frequency to a non-critical frequency, thereby reducing EMC interference.

Benefits of technology

It effectively reduces EMC interference, avoids additional filter costs and space requirements, while meeting EMC requirements and improving the electromagnetic compatibility behavior of the motor.

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Abstract

The present invention relates to a method for operating a motor (4) by means of pulse width modulation, wherein during the period duration (T) Periode During the period, with a pulse duration (T) on At least one pulse width modulation signal pulse (70) is generated at the pulse position (T0) of the pulse, wherein the resulting amplitude spectrum (64) is at the critical frequency ( kritisch The amplitude value (A) is located at a position where at least one time parameter (T) of the pulse width modulation is present. Periode T0, T on ) by time parameter (T) Periode T0, T on ) and correction factor (T) korr The sum of ) is replaced by the correction factor (T) korr The amplitude spectrum (64') is altered so that the calculated amplitude spectrum is at the critical frequency ( kritisch The amplitude value (I) is reduced at point ) Amp ), and among them, the time parameter (T) is used. Periode T0, T on ) and the changed correction factor (T) korr ) to perform pulse width modulation.
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