Rocking device and control method
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Solution Overview
Problem
Existing rocking devices cause jolts due to rapid acceleration changes, disrupting user comfort and relaxation.
Innovation Solution
A rocking device with a support member, a motor that rotates in both directions, and a controller that manages the rocking motions by providing a prescribed stopped period between the first and second motions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the motor rotates continuously to maintain rocking motion, then the rocking cycle is maintained, but acceleration changes rapidly causing jolts to the user
Solution Approach 1:
The motor is controlled to operate periodically with distinct phases: accelerating phase, constant speed phase, decelerating phase, and stopped phase. This periodic action pattern creates smooth transitions by ensuring the support member comes to a complete stop before reversing direction, eliminating sudden acceleration changes that cause jolts while maintaining continuous rocking cycles.
2Speed
If the motor reverses direction quickly to maintain rocking rhythm, then the rocking frequency is maintained, but the change in acceleration causes discomfort
Solution Approach 1:
Before the motor reverses direction to change the rocking phase, it performs preliminary deceleration to reduce speed and then comes to a complete stop. This preliminary action of stopping before reversal prepares the system for direction change, ensuring smooth transitions and preventing sudden acceleration changes that would cause discomfort to the user.
Data Source
AI summary
A rocking device includes: a seat which supports a body of a user; a motor which rotates a rotation shaft in a first rotation direction and in a second rotation direction that is a rotation direction opposite to the first rotation direction, and thereby supplies motive power for rocking the seat via a gear attached to the rotation shaft; and a controller which controls rocking of the seat via the motor. The seat is configured to make a first motion of moving in a first movement direction, in accordance with rotation of the rotation shaft in the first rotation direction, and make a second motion of moving in a second movement direction, in accordance with rotation of the rotation shaft in the second rotation direction. The controller is configured to control rocking of the seat such that a prescribed stopped period is provided between the first motion and second motion.