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
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- ASTEMO LTD
- Filing Date
- 2022-08-10
- Publication Date
- 2026-06-26
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.
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Smart Images
Figure 0007880771000001 
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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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