Control device for rotating electric machines

The control device for rotating electric machines addresses the issue of inaccurate regenerative torque control by calculating current command values based on torque and state variables, ensuring efficient torque control by setting the current to the power generation start current, thus maintaining zero current and matching torque command values.

JP7876411B2Active Publication Date: 2026-06-19MITSUBISHI ELECTRIC MOBILITY CORP
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MITSUBISHI ELECTRIC MOBILITY CORP
Filing Date
2022-10-19
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing control devices for rotating electric machines fail to accurately control regenerative torque to 0 when the torque command value is 0, leading to inefficiencies due to unnecessary current flow and reduced efficiency.

Method used

A control device that calculates the current command value of the field winding based on torque command and specific operating state variables, using map data with discrete steps, and sets the current command value to the power generation start current when the torque command is 0, ensuring accurate control of regenerative torque.

Benefits of technology

The control device maintains the current command value at 0 A when torque command is 0, matching the torque command value, and accurately controls regenerative torque when it changes, thereby preventing inefficiencies.

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Abstract

To provide a control device of a rotating electrical machine that controls regenerative torque to 0 when torque command value is 0, and can accurately control regenerative torque to a torque command value when the torque command value changes from 0.SOLUTION: A control device of a rotating electrical machine calculates a current command value of a field winding corresponding to a current torque command value and a current specific operating state variable by referring to map data with the torque command value and the specific operating state variables as a map axis and the current command value of the field winding as map setting data, and sets current command value data for 0 torque command value increments at each of multiple increments of a specific operating state variable, in which 0 torque command value increments are provided, to a current at which power generation starts in the field winding, where rectified power generation begins by rectifying the induced voltage in the inverter and supplying it to the DC power supply.SELECTED DRAWING: Figure 3
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