Linear Vibration Motor Drive Circuit Phase Inversion
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Solution Overview
Problem
Current drive control systems for linear vibration motors take too long to stop the vibration, which is a limitation in haptics engineering where high response rates are required.
Innovation Solution
A drive control circuit that generates a drive signal with alternating positive and negative currents, and after motor termination, supplies a drive current of opposite phase to quickly stop the linear vibration motor by using a drive signal generating unit and a driver unit to adjust the cycle width and phase of the drive signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional drive control is used, then the linear vibration motor operates normally, but the vibration stop time is too long
Solution Approach 1:
The patent applies preliminary anti-action by generating a drive signal with opposite phase before the motor completely stops. This opposite-phase signal creates a counteracting electromagnetic force that actively opposes the ongoing vibration, rapidly decelerating the vibrator and significantly reducing the vibration stop time, thereby improving the response rate for haptics applications.
2Loss of time
If drive signal phase is reversed to quicken stop, then vibration stop time is reduced, but motor control complexity increases
Solution Approach 1:
The patent implements periodic action by using alternating current signals that naturally reverse phase in each cycle. The drive control circuit leverages this inherent periodicity by simply inverting the phase of the ongoing drive signal to generate the opposite-phase braking signal, avoiding the need for complex control logic or additional switching components.
Solution Approach 2:
The patent applies self-service by utilizing the existing drive signal generating unit and driver unit to produce the opposite-phase signal. The same components that generate the forward drive signal are reused to generate the braking signal by simply inverting the phase, eliminating the need for separate braking circuitry and reducing overall system complexity.
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 reduces the vibration stop time, enhancing the response rate of linear vibration motors and maintaining driving force and efficiency, even with variations in eigen frequencies and spring properties.
Implementation Method 1
a linear vibration motor, having a stator and a vibrator at least one of which is constituted by an electromagnet, which vibrates the vibrator relative to the stator by supplying a drive current to a coil of the electromagnet
Implementation Method 2
the drive signal generating unit generates a drive signal whose phase is opposite to the phase of the drive signal generated during the motor running, and the driver unit supplies the drive current of opposite phase according to the drive signal of opposite phase, to the coil so as to quicken a stop of the linear vibration motor
Data Source
AI summary
A drive signal generating unit generates a drive signal used to alternately deliver a positive current and a negative current to a coil. A driver unit generates the drive current in response to the drive signal generated by the drive signal generating unit and supplies the drive current to the coil. After the drive termination of a linear vibration motor, the drive signal generating unit generates a drive signal whose phase is opposite to the phase of the drive signal generated during the motor running. The driver unit quickens the stop of the linear vibration motor by supplying to the coil the drive current of opposite phase according to the drive signal of opposite phase.