Dual-Coil Voice Coil Motor Control Without Permanent Magnets
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Solution Overview
Problem
Voice coil motors with permanent magnets face stability issues in high-temperature, high-heat, and impact scenarios due to uncontrolled magnetic fields, affecting motion and control accuracy.
Innovation Solution
A voice coil motor design incorporating inner and outer coil modules without permanent magnets, utilizing force feedback and closed-loop control to adjust electromagnetic forces, ensuring stability and improved control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnets are used in voice coil motors, then the motor can generate magnetic field and electromagnetic force, but the magnetic field strength becomes unstable under high temperature and impact conditions
Solution Approach 1:
The patent replaces the permanent magnet magnetic field generation system with an electromagnetic coil system. Instead of relying on permanent magnets that are sensitive to temperature and impact, the invention uses controllable electromagnetic coils to generate the necessary magnetic field, thereby eliminating the reliability issues associated with permanent magnets in harsh environments.
Solution Approach 2:
The patent changes the operational parameters by using controllable electromagnetic coils with adjustable current to generate magnetic field, replacing fixed permanent magnets. This allows dynamic adjustment of magnetic field strength to compensate for environmental variations, maintaining stable motor performance under high temperature and impact conditions.
2Device complexity
If permanent magnets are used in voice coil motors, then the motor structure is simplified, but the control accuracy deteriorates due to uncontrolled magnetic field variations
Solution Approach 1:
The patent replaces the passive permanent magnet system with an active electromagnetic coil system that can be precisely controlled. This substitution enables accurate control of the magnetic field strength through current regulation, thereby improving control accuracy while maintaining a relatively simple motor structure.
Solution Approach 2:
The patent implements a closed-loop control system that uses feedback to adjust the coil current and maintain precise control of the electromagnetic force. This feedback mechanism compensates for any variations in the system, ensuring high control accuracy despite environmental changes or manufacturing tolerances.
3Duration of action of stationary object
If permanent magnets are used in voice coil motors, then the motor can operate continuously, but the environmental adaptability decreases in high temperature and high heat scenarios
Solution Approach 1:
The patent replaces temperature-sensitive permanent magnets with electromagnetic coils that are less sensitive to thermal effects. The coil system can maintain stable performance across a wider temperature range, improving environmental adaptability while preserving continuous operation capability through proper thermal management and control.
Solution Approach 2:
The patent enables dynamic parameter adjustment by controlling coil current to compensate for temperature variations. This allows the motor to adapt to different environmental conditions while maintaining continuous operation, as the electromagnetic parameters can be adjusted in real-time to counteract thermal effects.
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
Enhances environmental adaptability and stability, allowing precise control of motor acting forces in demanding conditions, suitable for applications requiring high accuracy such as robot fingers.
Implementation Method 1
driving the outer coil module of the voice coil motor to generate an outer coil electromagnetic force
Implementation Method 2
driving the inner coil module of the voice coil motor to generate an inner coil electromagnetic force according to the inner coil current instruction
Data Source
AI summary
Disclosed are a voice coil motor, a method and a device for controlling the voice coil motor. The voice coil motor includes an outer coil module and an inner coil module inside the outer coil module, an air gap for the inner coil module to move is formed between the inner coil module and the outer coil module. The method includes: driving the outer coil module to generate an outer coil electromagnetic force; determining an inner coil current instruction according to an expectation force instruction and force feedback information sent by an executing mechanism of the voice coil motor; driving the inner coil module of the voice coil motor to generate an inner coil electromagnetic force according to the inner coil current instruction; and enabling the executing mechanism to generate a motor acting force according to the outer coil electromagnetic force and the inner coil electromagnetic force.