Torque Correction Mechanism for Synchronous Motor Control
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Solution Overview
Problem
Existing motor control systems for synchronous motors struggle to maintain a fixed torque constant due to individual differences in motor production and electronic component variations, leading to torque variations that affect precision control.
Innovation Solution
A motor control device with a torque correction mechanism that uses a correction torque coefficient to adjust the torque command, calculated as the ratio of unloaded speeds or voltages between a reference motor and mass-produced motors, ensuring a consistent torque constant across different motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed torque constant is used in speed control, then the control system is simple, but torque variations occur due to individual differences in motor production and electronic component variations
Solution Approach 1:
The patent changes the torque constant parameter from a fixed value to a variable that is automatically adjusted based on detected torque information. The control unit detects actual torque output and modifies the torque constant parameter dynamically, allowing each motor to operate with its optimal torque constant despite individual manufacturing variations, thereby resolving the contradiction between system simplicity and torque consistency.
2Manufacturing precision
If the torque constant is corrected for each individual motor, then torque control precision is improved, but the device complexity increases
Solution Approach 1:
The control system performs self-adjustment by automatically detecting the actual torque output and autonomously modifying its own torque constant parameter without requiring external calibration equipment or manual intervention. This self-service mechanism enables precise torque control for each individual motor while keeping the system relatively simple, as the motor itself provides the information needed for correction.
Solution Approach 2:
The patent implements a feedback loop where the control unit continuously detects actual torque output and uses this information to adjust the torque constant parameter. This closed-loop feedback mechanism ensures that torque control precision is maintained by constantly adapting to individual motor characteristics, while the feedback process is integrated into the existing control architecture to minimize added complexity.
Data Source
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AI summary
A motor control device at least includes a speed control part for controlling a motor rotation speed. The motor control device includes a torque correction means for suppressing variation in torque constant due to individual differences of motors. In addition, the motor control device corrects the torque constant by using a correction torque coefficient calculated based on an unloaded speed when a fixed voltage is applied. Alternatively, the torque constant is corrected using the correction torque coefficient calculated based on the motor applied voltage when the motor speed is fixed.