Piezoelectric Drive Controller for Rapid Stop Positioning
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Solution Overview
Problem
Existing drive controllers for motors, such as stepping motors and DC motors, face challenges in quickly stopping a movable body during high-speed drive while maintaining high stop accuracy, leading to misalignment and increased power consumption due to inertia and detent torque effects.
Innovation Solution
A drive controller that uses a piezoelectric actuator driven by a piezoelectric element, which compares the target stop position with the real position using a position sensor and turns off energization when they match, allowing for precise and rapid stopping of the movable body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If energization is turned off after the movable body is completely stopped, then power consumption is reduced, but the stopping time becomes excessively long
Solution Approach 1:
The patent applies preliminary action by turning off the energization of the piezoelectric actuator at the precise moment when the movable body reaches the target position, rather than waiting for complete stopping. This preliminary timing of energization cutoff reduces power consumption while maintaining accurate positioning, as the piezoelectric element retains its deformed state and holds the movable body at the target position without requiring continued power supply.
2Use of energy by moving object
If energization is turned off during high-speed drive, then power consumption is reduced quickly, but the movable body stops at a position past the target due to inertia
Solution Approach 1:
The patent employs feedback control by continuously monitoring the position of the movable body using a position sensor and comparing it with the target position. Based on this feedback information, the control unit determines the precise timing to turn off the energization of the piezoelectric actuator, ensuring that the movable body stops accurately at the target position even when energization is cutoff during high-speed drive. This feedback mechanism compensates for inertial effects and maintains stop accuracy.
3Stability of the object's composition
If tentative stopping is performed followed by movement to a stably stopped position, then stop stability is improved, but the total time from drive to energization cutoff becomes very long
Solution Approach 1:
The patent extracts the stabilization function from the time-domain approach (tentative stopping followed by gradual stabilization) and implements it through the inherent mechanical properties of the piezoelectric actuator. The piezoelectric element, when deformed by applied voltage, creates a rigid mechanical connection that inherently stabilizes the movable body at the target position without requiring extended stabilization time. This extracts the stabilization mechanism from the temporal process and embeds it in the structural properties of the actuator.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables quick and accurate stopping of the movable body, reducing power consumption and minimizing misalignment, even under conditions of inertia and disturbance.
Implementation Method 1
a piezoelectric actuator that drives the movable body with a piezoelectric element expanded and contracted in response to an applied voltage
Data Source
AI summary
There is provided a drive controller including a determination part that compares a target stop position of a movable body, which is driven by a piezoelectric actuator driven by a piezoelectric element expanded and contracted in response to an applied voltage, with a real position of the movable body acquired on the basis of a position sensor, and determines whether or not the target stop position matches with the real position, and a drive control part that turns off energization of the piezoelectric actuator when the target stop position matches with the real position while the movable body is being driven by the piezoelectric actuator.