Electric Tool Motor Vector Control Using Torque and Acceleration Feedback
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Solution Overview
Problem
Existing electric tool systems lack precise control over motor torque and acceleration, leading to inaccuracies in motor operation, particularly in applications requiring precise rotational power and torque management.
Innovation Solution
An electric tool system with a control unit that performs vector control on a motor with a stator and rotor, incorporating a first acquisition unit for torque current, a second acquisition unit for rotor acceleration, and a command value generation unit that calculates and corrects torque and excitation currents based on acquired values, enhancing motor control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional motor control methods are used in electric tool systems, then the control system remains simple, but the accuracy of motor torque and acceleration control deteriorates
Solution Approach 1:
The control unit acquires actual torque current values and actual acceleration values from the motor, then compares these with command values to calculate correction amounts. This feedback mechanism enables precise control of motor torque and acceleration by continuously adjusting control parameters based on actual performance, directly resolving the contradiction between control accuracy and system simplicity.
Solution Approach 2:
The patent replaces complex mechanical control mechanisms with electronic control methods. By using a control unit that performs vector control and calculates correction amounts based on acquired sensor data, the system achieves high precision motor control through software-based correction rather than complex mechanical adjustments, improving accuracy while maintaining relative system simplicity.
2Manufacturing precision
If vector control is implemented without correction based on actual acceleration, then the control system remains less complex, but the precision of rotational power delivery deteriorates
Solution Approach 1:
The control unit acquires actual acceleration values from the motor and uses this feedback to calculate correction amounts for the torque current command values. This closed-loop control ensures precise rotational power delivery by continuously adjusting control parameters based on actual motor performance, directly addressing the need for manufacturing precision in rotational power delivery.
Solution Approach 2:
The control unit dynamically changes control parameters (torque current command values and excitation current command values) based on acquired acceleration data and calculated correction amounts. This parameter adjustment mechanism enables precise control of motor output characteristics, resolving the contradiction between delivery precision and control algorithm complexity.
Data Source
AI summary
An electric tool system includes a motor, a control unit, and an output shaft. The motor includes a stator and a rotor. The control unit performs vector control on the motor. The control unit includes a first acquisition unit, a second acquisition unit, and a command value generation unit. The command value generation unit calculates, based on a torque current acquisition value (current measured value) as a value related to a torque current as acquired by the first acquisition unit and an acceleration acquisition value as a value related to acceleration of the rotor as acquired by the second acquisition unit, at least one of a command value of the torque current to be supplied to the motor or a command value of an excitation current to be supplied to the motor.