Linear Motor Voltage Control for Directional Vibration Feedback
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Solution Overview
Problem
Current linear motor applications in mobile devices only provide a vibration reminder function without allowing users to perceive clear vibration direction.
Innovation Solution
A driving voltage generation method for linear motors that determines system gain and current phase, calculates driving voltage based on target acceleration and initial amplitude, and adjusts voltage according to preset rules to achieve directional vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If linear motor is used for vibration reminder function, then vibration effect is provided, but user cannot perceive clear vibration direction
Solution Approach 1:
The patent segments the vibration signal into multiple frequency components (fundamental frequency and second harmonic frequency) with different amplitudes. By controlling the amplitude ratio between these frequency components, the system encodes directional information that users can perceive, thereby resolving the contradiction between providing vibration feedback and conveying clear directional information.
Solution Approach 2:
The patent changes the frequency domain parameters of the vibration signal by introducing a second harmonic frequency component with a specific amplitude ratio relative to the fundamental frequency. This parameter modification enables directional perception while maintaining the vibration reminder function, thus resolving the information loss problem.
2Manufacturing precision
If driving voltage is calculated based on target acceleration and system parameters, then vibration control is achieved, but driving voltage may not reach target amplitude
Solution Approach 1:
The patent implements a feedback mechanism where the calculated driving voltage is compared against the target voltage amplitude. When the driving voltage does not reach the target amplitude, the system automatically adjusts by increasing the voltage according to preset rules, ensuring both precise control and sufficient amplitude reliability.
Solution Approach 2:
The patent introduces dynamic adjustment of driving voltage based on real-time comparison with target amplitude requirements. The system transitions from a static calculation approach to a dynamic control approach where voltage can be increased according to preset rules when needed, balancing precision control with reliability.
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
Enables the linear motor to express vibration effects in a specific direction, enhancing user perception of directional vibration.
Implementation Method 1
The tactile feedback in the prior art plays an important role in the interactive experience of electronic products. The form of tactile feedback is often realized by the vibration of a linear motor
Data Source
AI summary
The present invention provides a linear motor driving voltage generation method and related devices. The object is to use the driving voltage generated by the driving voltage generation method to effectively control the linear motor to express the vibration effect in a specific direction. The method of an embodiment of the present invention includes: determining the system gain and current phase of the linear motor system, obtaining the target acceleration and amplitude of initial value of the linear motor, calculating the driving based on the target acceleration and the initial value amplitude, the system gain, and the current phase.