Voice Coil Motors (VCM), also called Voice Coil Actuators (VCA), is an electric motor consists of a magnet and yoke in conjunction with a coil. The magnet’s position, the type of magnet, the surrounding structure, etc., can influence the efficiency of the unit.

Voice-Coil-Motors

Voice-Coil-Motors

Some examples of applications of VCM
Shaker/Vibrator
Voice coil actuators (VCAs) provide advanced solutions for a broad range of industrial shaking applications where the actuator is used as the vibration source.
Lens focusing
Voice coil motor (VCM) actuator is used for cell phone camera applications in which the lens was precisely positioned by a closed-loop feedback signal generated by a Hall element.
Servo valves
Voice coil motor (VCM) actuator is used for servo valves.
Positioning Stage
Voice coil motor (VCM) actuator is widely used for positioning stage.
Speaker
Voice coil motor (VCM) actuator is widely used for speaker.

Advantages of VCM
Linear DC Motors, Voice Coil Motors (VCM) or Voice Coil Actuators (VCA) are the simplest type of electric motors. These motors consist of two separate parts; the magnetic housing and the coil. Applying a voltage across the terminals of the motor causes the motor to move to one direction. Reversing the polarity of the applied voltage will move the motor to the opposite direction. The generated force is proportional to the current that flows through the motor coil. This force is almost constant in the specified stroke range of the motor. Voice coil motors are brushless and do not utilize commutation. Their structural stability can support high positioning resolutions presented by external position sensors and motion controllers. These are many advantages of VCM.
No commutation required
Low to no hysteresis
Zero cogging
Fewer mechanical components compared to “screw-type” actuators
Linear control characteristics
High power to mass ratio
High power to volume ratio
Infinite position (only limited by the encoder device)
High acceleration

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