Motor control device
The motor control device addresses efficiency loss by limiting d-axis and q-axis currents based on maximum torque values, maintaining efficiency and torque during field weakening control.
JP2026064079APending Publication Date: 2026-04-13TOYOTA INDUSTRIES CORP
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Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOYOTA INDUSTRIES CORP
- Filing Date
- 2024-10-01
- Publication Date
- 2026-04-13
AI Technical Summary
Technical Problem
Existing motor control systems experience a decrease in efficiency during field weakening control due to excessive d-axis current and reduced torque, leading to increased motor current and inefficiency.
Method used
A motor control device that includes a current limiting unit to set limits on d-axis and q-axis currents based on maximum torque current values, using a map to adjust current limits according to rotational speed and maximum output voltage, thereby preventing excessive current flow and maintaining efficiency.
Benefits of technology
The solution effectively suppresses a decrease in motor efficiency and torque by limiting current values, ensuring optimal performance during field weakening control.
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Smart Images
Figure 2026064079000001_ABST
Abstract
The present invention provides a motor control device that can suppress the decrease in motor efficiency while performing field weakening control. [Solution] The motor control device 100 includes a motor voltage calculation unit 29 that calculates a motor voltage command value Vm*, a field weakening control unit 30 that performs field weakening control based on the motor voltage command value Vm*, and a current command limiting unit 22 that limits the d-axis current command Id* and the q-axis current command Iq* based on a current limiting value Imlim. When the motor voltage command value Vm* becomes greater than or equal to the maximum output voltage Vmax, the field weakening control unit 30 increases the magnitude of the d-axis current command Id* so that the motor voltage command value Vm* follows the maximum output voltage Vmax. The current command limiting unit 22 sets the current limiting value Imlim to the maximum torque current value Itmax according to the rotational speed ω of the motor 210.
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Citation Information
Patent Citations
Device for controlling drive of permanent magnet type synchronous motor
JP2006141095A
Rotary electric machine
JP2014128170A