Motor control device and power converter

The motor control device addresses stalling detection inaccuracies by using rotational speed and torque values to set a determination period for torque limiting, ensuring efficient and comfortable vehicle operation.

JP7880771B2Active Publication Date: 2026-06-26ASTEMO LTD
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Patent Information

Application Number
JP2022128080
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Filing Date
2022-08-10
Publication Date
2026-06-26
Estimated Expiration
2042-08-10

AI Technical Summary

Technical Problem

Existing motor control systems in vehicles fail to accurately detect stalling conditions, leading to delayed torque limitation and excessive suppression of power converter performance, causing discomfort due to torque fluctuations and potential overheating of switching elements.

Method used

A motor control device that determines stalling based on motor rotational speed and commanded torque value, sets a determination period before applying torque limiting, and gradually reduces torque to prevent excessive performance suppression and overheating.

Benefits of technology

Accurate detection of stalling conditions allows for timely torque limiting, preventing excessive power converter performance suppression and overheating, thus maintaining system efficiency and occupant comfort.

✦ Generated by Eureka AI based on patent content.

Smart Images

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Patent Text Reader

Abstract

To perform torque limitation on the basis of the occurrence of a stall without excessively restricting the performance of a power converter including a switching element.SOLUTION: A motor control device 15 that controls a motor by controlling a switching element on the basis of a command torque value includes: a stall state determination unit 32 that determines whether a stall has been occurring or not, on the basis of a motor rotation speed and the command torque value; a determination period setting unit 33 that sets a determination period required from a start of occurrence of the stall to execution of torque limitation; and a torque control unit 34 that limits an upper limit value of torque of the motor when a state in which the stall has been occurring exceeds the determination period.SELECTED DRAWING: Figure 2
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Citation Information

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