Vibration Motor Control Device for Rapid Start-Stop Responsivity
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Solution Overview
Problem
Existing vibration motor control systems in electronic devices, such as smartphones and gaming equipment, face challenges in responsivity, with slow start-up and stoppage times, leading to inadequate and dull vibration feedback for users.
Innovation Solution
A control device for vibration generation devices that adjusts the maximum voltage values and application times during start-up, steady operation, and reverse rotation periods, allowing for higher start-up torque and rapid stoppage, and enabling the generation of various vibration patterns by controlling the drive signal voltage and duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a vibration motor is used with conventional control, then the device can generate vibration, but the start-up time is long and the stoppage time is long, resulting in poor responsivity
Solution Approach 1:
The patent applies dynamics by making the drive signal voltage variable rather than constant. The control section dynamically adjusts the voltage applied to the vibration motor based on the operational phase: applying a first voltage during start-up, a second voltage during steady operation, and a third voltage during stoppage. This dynamic voltage adjustment enables the motor to respond quickly during transitions while maintaining efficient operation during steady state, thereby resolving the contradiction between fast response and time efficiency.
Solution Approach 2:
The patent implements periodic action by dividing the operation into distinct phases with different voltage levels: start-up period with first voltage, steady operation period with second voltage, and stoppage period with third voltage. This periodic switching of voltage levels optimizes performance for each phase - enabling rapid start-up and stoppage when needed while maintaining stable operation during steady state, thus improving both speed and reducing time loss.
2Speed
If higher voltage is applied to speed up start-up, then the start-up torque increases and start-up time decreases, but the power consumption increases
Solution Approach 1:
The control section dynamically adjusts voltage based on operational requirements. During start-up, a higher first voltage is applied to generate sufficient torque for rapid acceleration. During steady operation, the voltage is reduced to a lower second voltage to maintain rotation with minimal power consumption. During stoppage, a third voltage is applied to quickly halt the motor. This dynamic voltage control resolves the contradiction by applying high power only when necessary for start-up and stoppage, while using lower power during steady operation.
Solution Approach 2:
The patent uses periodic action by switching between different voltage levels at different operational stages. The first voltage (higher) is applied periodically during start-up and stoppage phases to achieve fast response. The second voltage (lower) is applied during the steady operation phase to minimize power consumption. This periodic switching strategy enables the system to achieve rapid start-up and stoppage without sustaining high power consumption throughout operation, thus resolving the contradiction between speed and energy usage.
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 enhances the responsivity of vibration motors by shortening start-up times, improving stoppage speed, and allowing for the creation of diverse vibration patterns, providing more effective and engaging user feedback.
Implementation Method 1
The weight has the gravity center at a position shifted from the central axis of the shaft. In the vibration motor, the rotor rotates to cause the centrifugal action of the weight with the gravity center shifted, and thus, the vibration is generated.
Data Source
AI summary
A vibration generation device includes a stator, and a rotor rotatable around a predetermined axis with respect to the stator and having a weight having a gravity center at a position shifted from the predetermined axis. A control section controls a start-up period maximum voltage value, which is a maximum voltage value of a drive signal to be applied to the vibration generation device in a start-up period, to become larger than a steady operation period voltage value, which is a voltage value of the drive signal to be applied to the vibration generation device in a steady operation period. The control section selects at least one of a pluraity of voltage values as the steady operation period voltage value and sets the duration of the start-up period based on the steady operation period voltage value selected.