Motor Vibration Control via Digital Equalizer Signal Processing
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Solution Overview
Problem
Existing smartphone motor vibration control technologies fail to accurately achieve the expected motor vibration effect due to the lack of specific control methods for motor vibration, leading to discrepancies between intended and actual vibration curves.
Innovation Solution
A method involving the use of a second-order recursive digital filter (equalizer) to process input signals based on measured motor damping and resonance frequencies, ensuring the output signal effectively controls motor vibration to match the expected vibration curve, with optional amplitude adjustments to meet similarity thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a control signal is obtained by using the expected motor vibration curve, then the motor vibration effect can be controlled, but the actual vibration effect does not match the expected effect due to different motor properties
Solution Approach 1:
The patent changes the parameters of the control signal by introducing an equalizer with transfer function H(z) that adjusts the frequency response characteristics. The equalizer modifies the control signal parameters (amplitude and phase) across different frequency components to compensate for motor-specific variations, thereby achieving consistent vibration effects across different motor properties.
Solution Approach 2:
The patent implements a feedback mechanism where the actual motor vibration response is measured and used to adjust the control signal through the equalizer. The transfer function H(z) is designed based on the measured motor characteristics, creating a closed-loop system that adapts the control signal to match the expected vibration curve despite motor property variations.
2Manufacturing precision
If the equalizer is used to process the input signal, then the similarity between actual and expected vibration curves is improved, but the device complexity increases
Solution Approach 1:
The patent introduces an equalizer as an intermediary component between the control signal generator and the motor. This intermediary device (equalizer with transfer function H(z)) processes the control signal to compensate for system variations, achieving high vibration curve similarity without requiring complex changes to the motor or control architecture.
Solution Approach 2:
The patent replaces direct mechanical tuning or complex mechanical vibration control mechanisms with a digital signal processing approach (equalizer). By substituting mechanical complexity with electronic/digital processing, the system achieves precise vibration control while maintaining relatively simple hardware architecture.
Data Source
AI summary
The present disclosure relates to the technical field of electronic devices, and discloses a method and an apparatus for controlling motor vibration. The method includes: obtaining an input signal based on an expected motor vibration curve, inputting a digital signal sequence of the input signal to an equalizer, and obtaining an output signal after processing by the equalizer, and inputting the output signal to a motor to control vibration of the motor, where the equalizer is a digital filter constructed based on a damping factor ζ and a resonance frequency ωn of the motor, and a preset system sampling frequency fs, a preset damping factor ζd, and a preset cut-off frequency ωd. The method and apparatus provided in embodiments of the present disclosure have an advantage that an actual vibration effect of the motor can be consistent with an expected motor vibration curve.