Motor Control Apparatus Homing Frequency Reduction
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Solution Overview
Problem
Conventional motor control systems for vehicles often result in frequent contact between a control object and a stopper wall, leading to potential motor distortion or wear, especially when the vehicle is operated under various conditions.
Innovation Solution
A motor control apparatus comprising an electric motor, a homing control section, a distance determination section, and a forbiddance section, which executes homing control only when an initialization condition is met and forbids further executions if the user is within a predetermined distance, reducing unnecessary contact with the stopper wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If homing control is executed frequently to ensure accurate position control, then positioning accuracy is improved, but motor wear and distortion increase due to repeated contact with the stopper wall
Solution Approach 1:
The system performs homing control only when necessary (when initialization conditions are met), rather than executing it frequently or continuously. The control section determines whether homing control has already been executed and suppresses redundant executions, thereby performing the positioning action only when preliminarily determined to be necessary.
Solution Approach 2:
Instead of executing homing control fully and frequently to ensure positioning accuracy, the system applies partial action by executing homing control only when initialization conditions are satisfied, suppressing unnecessary repetitions while maintaining adequate positioning accuracy for normal operation.
2Measurement precision
If homing control is executed whenever initialization condition is satisfied, then positioning accuracy is maintained, but the number of executions increases causing motor distortion and wear
Solution Approach 1:
The control section preliminarily determines whether homing control has already been executed by checking execution history or flags, and only allows homing control to execute when initialization conditions are met and no recent execution occurred. This preliminary check prevents redundant executions.
Solution Approach 2:
Instead of continuous or frequent homing control executions, the system implements periodic action by allowing homing control to execute only at specific intervals determined by initialization conditions and execution history, thereby reducing overall execution frequency while maintaining necessary positioning accuracy.
Data Source
AI summary
A motor control apparatus includes an electric motor, a homing control section, a distance determination section, and a forbiddance section. The electric motor moves a control object equipped to a vehicle at least between two positions. The homing control section executes a homing control for controlling the electric motor to move the control object so that the control object press-contacts a stopper wall when an initialization condition is satisfied. The distance determination section determines whether a user of the vehicle is apart from the vehicle at a distance greater than a predetermined distance. The forbiddance section forbids the homing control during a period, which starts at a time of the homing control execution and ends at a time when the user of the vehicle is apart from the vehicle farther than the predetermined distance, even when the initialization condition is satisfied during the period.