Motor Control Velocity Profile Compensation for Torque Overload
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Solution Overview
Problem
Existing motor control systems face inefficiencies when operating at high velocities due to reduced torque, leading to potential motor overload and instability, especially in regions requiring high torque or inertia, as they typically limit motor speed to rated RPM to prevent overload.
Innovation Solution
A motor control method that estimates the current torque using a dynamic model of the driven body and compensates the velocity profile in real-time if the estimated torque exceeds a predetermined value, allowing the motor to operate at higher velocities while preventing overload by adjusting the velocity profile based on calculated acceleration and torque values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the motor operates at high velocity beyond rated RPM, then the velocity efficiency is improved, but the torque decreases and motor stability deteriorates
Solution Approach 1:
The velocity profile is dynamically adjusted in real-time based on estimated torque conditions. The control system continuously monitors torque requirements and adapts the velocity profile parameters (acceleration time, deceleration time, maximum velocity) to match actual operating conditions, enabling stable high-velocity operation
Solution Approach 2:
The system estimates current torque based on the dynamic model of the driven body and uses this feedback to compensate the velocity profile. By comparing estimated torque with required torque, the system adjusts velocity profile parameters to prevent motor overload while maintaining high velocity operation
2Reliability
If the motor is limited to rated RPM to prevent overload, then motor reliability is improved, but velocity efficiency deteriorates
Solution Approach 1:
The system changes velocity profile parameters (acceleration time, deceleration time, maximum velocity) based on torque conditions. By adjusting these parameters in real-time, the motor can operate beyond rated RPM when conditions permit, improving velocity efficiency while maintaining reliability through adaptive parameter optimization
3Ease of operation
If the velocity profile is fixed in advance, then control simplicity is improved, but adaptability to changing torque conditions deteriorates
Solution Approach 1:
The velocity profile transitions from a fixed static definition to a dynamic adaptive profile. The system continuously compensates velocity profile parameters based on real-time torque estimation, enabling the profile to adapt to changing torque conditions while maintaining smooth motor operation
Solution Approach 2:
The control system automatically adjusts the velocity profile based on its own torque estimation without requiring external intervention. The system self-regulates by comparing estimated torque with actual requirements and autonomously compensating the velocity profile parameters
Data Source
AI summary
Disclosed herein are a motor control apparatus and a motor control method thereof. The motor control method includes estimating a current torque of a motor based on dynamics of a body driven by the motor, judging whether the estimated torque is higher than a predetermined torque value, compensating for a velocity profile to drive the motor from the predetermined torque value, upon judging that the estimated torque is higher than the predetermined torque value, and driving the motor using the compensated velocity profile. Thereby, the velocity profile is compensated for in real time, and thus the velocity of the motor is raised while preventing the motor from stepping out.