Motor Return Control to Prevent Excessive Limit Rebound
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Solution Overview
Problem
Conventional motor control devices experience power consumption and heat generation issues due to continuous energization after non-energization return control, as they fail to accurately determine whether a motor has reached a movable limit position, leading to potential excessive returns.
Innovation Solution
A motor control device with an energization control unit and an excessive return determination unit that assesses the possibility of excessive return by turning off energization after driving the motor to a movable limit position, allowing continuous de-energization if no risk is detected and performing stop control with energization if a risk is determined.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous energization is performed after non-energization return control, then the motor can be reliably stopped, but power consumption increases and heat generation occurs
Solution Approach 1:
The control device dynamically adjusts the energization strategy based on real-time motor position feedback. When the motor is confirmed to be within the safe range from the movable limit position, the control device transitions from continuous energization to discontinuous energization, optimizing power consumption while maintaining stopping reliability when needed.
Solution Approach 2:
The control device uses feedback from the motor position detection unit to continuously monitor the motor's position during non-energization return control. Based on this feedback, the control device determines whether to maintain continuous energization or switch to discontinuous energization, ensuring reliable stopping while reducing unnecessary power consumption and heat generation.
2Reliability
If continuous energization is performed after non-energization return control, then the motor can be reliably stopped, but heat generation increases
Solution Approach 1:
The control device dynamically adjusts the energization strategy based on real-time motor position feedback. When the motor is confirmed to be within the safe range from the movable limit position, the control device transitions from continuous energization to discontinuous energization, reducing heat generation while maintaining stopping reliability when needed.
Solution Approach 2:
The control device uses feedback from the motor position detection unit to continuously monitor the motor's position during non-energization return control. Based on this feedback, the control device determines whether to maintain continuous energization or switch to discontinuous energization, ensuring reliable stopping while minimizing unnecessary heat generation.
3Use of energy by moving object
If non-energization return control is performed by turning off energization, then power consumption is reduced, but the motor may excessively return beyond the allowable position
Solution Approach 1:
The control device implements continuous feedback monitoring of the motor position during non-energization return control. When the motor position approaches the allowable return position range, the control device detects this through the position detection unit and activates stop control with energization, preventing excessive return while maintaining power efficiency during the return process.
Solution Approach 2:
The control device performs preliminary determination of the motor's return trajectory and position. Before the motor can excessively return, the control device predicts the potential overshoot based on current position and velocity, and preemptively activates stop control with energization to prevent exceeding the allowable return position, ensuring position control accuracy.
4Reliability
If stop control with energization is always performed, then motor position control accuracy is maintained, but power consumption and heat generation increase
Solution Approach 1:
The control device dynamically switches between discontinuous energization during normal return operation and continuous energization when stop control is required. This dynamic adjustment maintains position control accuracy when needed while minimizing power consumption during the majority of the return process.
Solution Approach 2:
The control device uses real-time position feedback to determine when stop control with energization is necessary. By monitoring motor position continuously and comparing it against the allowable return position range, the control device activates energization-based stop control only when the motor approaches the boundary, maintaining accuracy while avoiding unnecessary energy consumption.
Data Source
AI summary
A motor control device includes an energization control unit and an excessive return determination unit. The energization control unit controls energization to a motor. The excessive return determination unit determines whether or not there is a possibility of an excessive return exceeding an allowable return position, when a non-energization return control is performed to return a motor in a direction away from a movable limit position by an external force generated in the rotation transmission system by turning off the energization to the motor after driving the motor to the movable limit position where the drive is restricted by the drive limiting portion. When it is determined that there is no possibility of the excessive return, the energization is continuously turned off, and when it is determined that there is a possibility of the excessive return, a stop control configured to stop the motor by energizing is performed.