Control device, inverter, assembly with inverter and electric machine, method for operating an inverter and computer program product
By adjusting the carrier frequency according to the motor's speed and torque, the problems of total harmonic distortion and mechanical vibration in motor drive are solved, and the inverter's efficient operation is achieved.
CN113939995BActive Publication Date: 2026-06-05VALEO EAUTOMOTIVE GERMANY GMBH
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- VALEO EAUTOMOTIVE GERMANY GMBH
- Filing Date
- 2020-07-27
- Publication Date
- 2026-06-05
AI Technical Summary
Technical Problem
Existing technologies in motor drives suffer from total harmonic distortion and mechanical vibration problems due to pulse width modulation at a constant carrier frequency, which are particularly pronounced in the low torque region.
Method used
By dynamically adjusting the carrier frequency based on the operating point information defined by the motor's speed and torque, the total harmonic distortion is reduced by increasing the carrier frequency within a specific operating range.
Benefits of technology
It effectively reduces the total harmonic distortion of the inverter, reduces unwanted mechanical vibration, and keeps switching losses within an acceptable range.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN113939995B_ABST
Abstract
A control device (8) for an inverter (2) for feeding an electric machine (3), wherein the control device (8) is configured to provide a pulse width modulated switching signal (15) with a carrier frequency to drive switching elements (12) of the inverter (2), wherein the control device (8) is configured to determine the carrier frequency depending on operating point information describing an operating point defined by a rotational speed and a torque of the electric machine (3) and to increase the carrier frequency within an operating region (22) as the rotational speed increases and the torque amplitude decreases, the operating region (22) extending within a rotational speed interval having a lower rotational speed limit (23) different from zero and an upper rotational speed limit (24) located within a power limited operating region (21) or a field weakening operating region.
Need to check novelty before this filing date? Find Prior Art