Vibration Actuator Speed Control for Low-Speed Blind Zone Elimination
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Solution Overview
Problem
Vibration actuators face challenges in low-speed driving due to static friction, resulting in blind zones where they fail to operate, leading to sudden starts, stops, and abnormal noise, and controllability issues exacerbated by environmental and load variations.
Innovation Solution
A vibration driving device with a speed detection unit and adjustment mechanism that decreases vibration amplitude when the actuator operates outside target speed, using a control device to manage phase difference and frequency of drive voltages to maintain control within optimal parameters, avoiding blind zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is used to improve controllability, then position control accuracy is improved, but blind zone operation failure occurs in low speed driving
Solution Approach 1:
The patent implements feedback control by detecting the relative position between vibrator and contact member, calculating position deviation from target position, and adjusting drive parameters (phase difference and frequency) based on this deviation to maintain accurate position control while avoiding blind zone operation failure
Solution Approach 2:
The patent dynamically changes drive parameters (phase difference and frequency of drive voltages) based on detected position deviation to control the vibration actuator's output speed and position, enabling the system to escape from blind zones and maintain reliable operation
2Reliability
If control amount is increased to escape blind zone, then operation reliability is improved, but sudden start and stop occur causing abnormal noise
Solution Approach 1:
The patent dynamically adjusts drive parameters (phase difference and frequency) in real-time based on detected position deviation, enabling smooth and continuous control of the vibration actuator to escape blind zones without sudden starts or stops, thereby eliminating abnormal noise while maintaining operation reliability
3Measurement precision
If position feedback control is used to improve controllability, then position accuracy is improved, but controllability deteriorates under environmental and load variations
Solution Approach 1:
The patent implements comprehensive feedback control that detects relative position, calculates position deviation from target position, and dynamically adjusts drive parameters (phase difference and frequency) to compensate for environmental and load variations, maintaining accurate position control and controllability under varying conditions
Solution Approach 2:
The patent dynamically changes multiple drive parameters (phase difference and frequency of drive voltages) based on detected position deviation and operating conditions, enabling the system to adapt to environmental and load variations while maintaining precise position control and controllability
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
Improves controllability and reduces abnormal noise by ensuring consistent operation within target speed ranges, even under varying environmental and load conditions.
Implementation Method 1
a vibrator that has an elastic member and an electro-mechanical energy conversion element
Implementation Method 2
since the vibration actuator relatively moves the vibrator and contact member by friction drive
Data Source
AI summary
A vibration driving device that improves controllability in low speed driving. The vibration driving device includes a vibration actuator that includes a vibrator that has an elastic member and an electro-mechanical energy conversion element, a contact member that contacts the vibrator, and a control device that controls drive of the vibration actuator. The control device includes a speed detection unit that detects speed information showing relative speed of the vibrator and the contact member, and an adjustment unit that decreases amplitude of vibration excited in the vibrator in a case where the speed detection unit detects that a state where the vibration actuator does not operate approximately and a state where the vibration actuator operates at a speed faster than a target driving speed occur alternately after starting to drive the vibration actuator.