Operation Device Motor Inertia Control for Tactile Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing operation devices struggle to provide tactile stimulation in a short time due to fixed rise time and increased displacement amount caused by motor inertia, making it difficult to maintain the target displacement within required limits.
Innovation Solution
An operation device with a motor capable of forward and reverse rotation, a gear mechanism for linear motion, and a controller that adjusts acceleration and deceleration times to control the motor's driving power, ensuring the operation unit reaches the target displacement efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the rise time is shortened by extending acceleration time, then tactile stimulation is provided in a short time, but the displacement amount of the panel surface height becomes greater than the target displacement amount due to motor inertia
Solution Approach 1:
The patent applies preliminary anti-action by introducing a deceleration phase before the motor stops. The controller calculates a deceleration start time based on the relationship between acceleration time, deceleration time, and motor inertia, allowing the motor to reduce speed before stopping. This preliminary deceleration counteracts the inertial overshoot that would otherwise cause the panel surface to exceed the target displacement amount, thereby resolving the contradiction between shortening rise time and maintaining displacement precision.
2Ease of operation
If the driving current stops, then the panel surface height reaches target by non-linear displacement through inertia, but the rise time becomes fixed and cannot be adjusted
Solution Approach 1:
The patent applies dynamics by making the motor operation dynamic through separate acceleration and deceleration phases controlled by the controller. Instead of a fixed stop condition, the system dynamically adjusts the deceleration start time based on the calculated relationship between acceleration time, deceleration time, and motor inertia. This dynamic control enables adjustable rise time while maintaining precise displacement control, resolving the contradiction between ease of operation and time efficiency.
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
The device effectively shortens the rise time for tactile stimulation while maintaining the displacement within limits, providing prompt and uniform tactile feedback to the operator.
Implementation Method 1
a motor capable of forward and reverse rotation
Implementation Method 2
a gear mechanism configured to convert forward and reverse rotation of the motor into linear ascending and descending motion
Implementation Method 3
after the driving current stops, the panel surface height can only reach a target panel surface height by being displaced in such a non-linear manner that a parabola is drawn with the speed immediately before the stop of the driving current being an initial velocity, on the basis of rotary motion through inertia of the motor
Data Source
AI summary
An operation device includes a motor capable of forward and reverse rotation, a transmission mechanism configured to convert forward and reverse rotation of the motor into linear ascending and descending motion and to provide tactile stimulation on an operation unit, and a controller configured to control switching of an energizing direction of the motor. The controller is configured to control acceleration such that an amount of ascending movement of the operation unit is increased by increasing driving power in a forward rotation direction of the motor, and to control deceleration such that the ascending movement of the operation unit decelerates by supplying driving power in a reverse rotation direction of the motor, in a predetermined time from when the operation unit starts the ascending movement via the transmission mechanism until a target displacement amount is reached.