Voice Coil Motor Driving Device Hysteresis Reduction
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Solution Overview
Problem
The hysteresis effect in voice coil motors significantly reduces their efficiency, necessitating a solution to regulate the stroke and power requirements effectively.
Innovation Solution
A voice coil motor driving device and method that generate and arrange digital current signals with forward and reverse current unit signals, considering their opposite directions and timing to reduce the hysteresis effect, utilizing a control module, current driving module, and input module to output control signals that include sinusoidal and cosinusoidal waves, with adjustable amplitudes and quantities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional driving signals are used without considering hysteresis effect, then the voice coil motor can operate, but the efficiency is significantly reduced due to hysteresis loss
Solution Approach 1:
The patent applies preliminary anti-action by introducing reverse current unit signals before the main forward current signals to preemptively counteract the hysteresis effect. The reverse current signals are arranged in time periods before the forward current signals to cancel out magnetic field residual effects, thereby reducing hysteresis loss and improving motor efficiency
Solution Approach 2:
The patent implements periodic action by structuring the driving signal as alternating sequences of forward and reverse current unit signals within periodic time periods. This periodic arrangement allows the motor to systematically address hysteresis effects through repeated cycles of forward propulsion and reverse field cancellation, optimizing energy efficiency
2Loss of energy
If reverse current unit signals are arranged at the beginning of the time period, then hysteresis effect is reduced, but the stroke regulation becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the driving signal into distinct forward current unit signals and reverse current unit signals, each occupying specific time periods. This segmentation allows independent optimization of each signal type's timing and amplitude, making the complex hysteresis compensation manageable through modular signal design
Solution Approach 2:
The patent implements dynamics by allowing flexible arrangement of reverse current signals at different time periods (beginning, middle, or end of the first time period) depending on operational requirements. This dynamic adaptability enables the system to optimize between hysteresis reduction and stroke regulation complexity based on real-time needs
3Loss of energy
If multiple reverse current unit signals are arranged in different time periods, then hysteresis effect is further reduced, but the power regulation becomes more difficult
Solution Approach 1:
The patent applies feedback by using the displacement information to dynamically adjust the arrangement and amplitude of reverse current unit signals. The control module receives displacement feedback and optimizes the reverse current signal configuration to achieve optimal hysteresis reduction while maintaining effective power regulation through closed-loop control
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 approach effectively reduces the hysteresis effect, enhancing the efficiency of the voice coil motor by regulating the stroke and power requirements through the strategic arrangement of forward and reverse current unit signals.
Implementation Method 1
A voice coil motor is a device that converts electrical energy into mechanical energy, which generates a regular motion of the voice coil motor, by utilizing a magnetic field interaction that is generated from a permanent magnet and an electrically conducted coil
Implementation Method 2
a hysteresis effect of the coil significantly reduces the efficiency of the voice coil motor
Data Source
AI summary
A voice coil motor driving device and a method for providing control signals of the same are provided. The voice coil motor driving device includes a control module, a current driving module, and an input module. The current driving module outputs a plurality of digital current signals according to a driving signal, each of the plurality of digital current signals includes a plurality of current unit signals, and each of the plurality of digital current signals is arranged in a first time period, each of the plurality of digital current signals includes a plurality of reverse current unit signals, and the plurality of reverse current unit signals are arranged in a second time period, which is at a beginning of the first time period, or arranged in a third time period, which is at the end of the first time period.