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Voice Coil motors and actuators

Voice Coils are ideal for short stroke (typically less than 2 inches) closed loop servo applications. Their compact size allows them to fit into small spaces. They have very low electrical and mechanical time constants. The low moving mass allows for high accelerations of light payloads.

These actuators are wound in such a way that no commutation is required for motion to occur. The result is a much simpler and more reliable system.

Coupling the actuators with a bearing system (if not supplied), position feedback device, linear servo amplifier and motion controller yields a system that is capable of intricate position, velocity, and acceleration control. These actuators can also be used for precise force control because of the linear force versus current characteristics.

Our voice coil actuators are available in both standard as well as custom sizes. You can choose from either the moving magnet (NCM type) or moving coil type (NCC Type).  See: Related Drives & Controls


  • The moving coil actuators, NCC Type (sometimes referred to as voice coils) are typically supplied without bearings or a shaft, but can be added if desired. They are generally larger in diameter and shorter in length. Higher forces can be achieved by increasing the diameter. This type of actuator can be designed with large radial clearances to ensure no contact between the coil and magnet assembly if a tilt or radial movement is required.
  • The moving magnet actuators, NCM Type are supplied with bearings and a shaft. This type is generally smaller in diameter and longer in length. Higher forces can be achieved by increasing the number of poles, which increases the length, or by increasing the diameter. The main advantage is that there are no moving leads since the coil assembly is stationary. Optional no power magnetic latching is available at one or both ends of the stroke.


It should be noted that for both types of actuators, longer strokes are available but the efficiency or motor constant (Km) decreases as the stroke increases. This is due to the fact that the motor constant is inversely proportional to the stroke. If higher efficiency is desired for longer stroke actuators, the coil assembly can be wound as a multiphase coil and then it will have to be commutated.



  • Small Size, High Force to Weight Ratio
  • High Accelerations
  • No Cogging or Commutation
  • Custom Designs with Quick Turnaround Times
  • High Flux Density Neodymium Magnets are Used
  • Z Axis for Pick and Place Equipment
  • Medical Diagnostic Probes and Laser Beam Steering
  • Mirror Tilt and Focusing Actuators
  • Miniature Position Control

    Related Drives & Controls