Voice Coil Actuators

  • Linear Voice Coil Actuators
  • Maximum Travel Ranges from 6.3 mm to 62.5 mm
  • High Purity of Motion


Voice Coil Actuator,
25 mm Travel

Zero Travel Position

Maximum Travel


Voice Coil Actuator,
6.3 mm Travel


Voice Coil Actuator,
62.5 mm Travel

Coil Assembly

Magnet Assembly

Related Items

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Voice Coil Fronts
Click to Enlarge

The top of each coil assembly includes SM threads and threaded holes for mounting to other components. See the table below for details.


  • Linear Voice Coil Motors
  • Direct Force Drive for High Purity of Motion
  • Up to 62.5 mm Maximum Travel
  • Current-Driven Operation
  • High-Speed, Precise Translation
  • Highly Responsive Acceleration and Deceleration
  • SM-Threaded Coil Assembly

Thorlabs' voice coil actuators are designed for use in applications requiring positioning with high speed or acceleration. These linear actuators use a bobbin and magnet assembly to provide linear force without contact between the moving and fixed world. The voice coil converts electrical signals directly into linear magnetic force, providing much higher purity of motion compared to DC motors requiring separate drivetrains such as belts or gears. When combined with a position sensor, our voice coils provide quick, accurate movement with excellent repeatability. The polarity of the voltage determines the translation direction of the motor. When using the red wire for positive voltage, the magnet assembly will extend when current is applied. The force can be approximated by multiplying the current by the force constant, although the position of the actuator will also affect the force provided by the actuator (see the graphs in the table below for details).

Both ends of the voice coil actuator should be firmly mounted so that the magnet assembly is suspended around the voice coil without contact. The VC063/M and VC125/M magnet assemblies have a center blind-tapped M3 mounting hole, while their coil assemblies have a center M3 mounting hole. The VC250/M, VC500/M, and VC600/M magnet assemblies have a center blind-tapped M6 mounting hole, while their coil assemblies have two M4 mounting holes on opposite sides of a center Ø6.35 mm through hole. The mounting holes could be used with our right-angle brackets to fix either end of the voice coil to an optical table or moving world of a stage. All voice coil assemblies have external SM threading for easier mounting to our fixed optic mounts or lens tubes.

If the voice coil actuator is translated beyond its maximum recommended travel range, the magnet assembly may be displaced too far from the coil assembly to maintain proper magnetic interaction. In this case, the actuator may no longer respond as expected and the voice coil must be manually contracted.

Posted Comments:
Oscar Martinez  (posted 2021-11-17 10:57:03.793)
Do you provide a controller for the voice coil?
jgreschler  (posted 2021-11-18 11:04:13.0)
Thank you for reaching out to Thorlabs. Unfortunately, we don't offer a controller for our voice coil actuators at the moment. That being said, we currently have a controller in development scheduled for release in Q2 2022.
user  (posted 2021-09-09 21:37:52.913)
We wish to buy one of these products to perform experiments and we have some queries regarding some of the possible applications First which part of the coil moves, is it the coil assembly or the magnet assembly? Can I attach a 30g mirror on the magnet assembly and expect it to oscillate about a mean position of frequency 1kHz. Will the coil be able load this mirror in the horizontal position? What resolution of movement can we expect (we require a max displacement of 60micrometers). At what voltage can we operate this coil.
azandani  (posted 2021-09-23 03:54:57.0)
Hello, thank you for contacting Thorlabs. Allow me to address each of your questions individually. Depending on how the voice coil is mounted, either the magnet or the coil can be the moving component. In most cases, the magnet will be the moving body so the wires do not get fatigued from constant movement. Your second question is more application dependent, but if you are looking to use it as a scanning device, a standalone voice coil will not yield ideal results. It is essentially just a motor and would need to be integrated and designed into a scanning device. The motion of a mirror mounted to the end of the voice coil would not provide constant motion on the surface of the mirror. That being said, these unfortunately do not have an encoder, so the movement resolution would be dependent on the resolution of the voltage and current applied.
Guoxing Gu  (posted 2021-03-14 01:25:55.75)
I would like to attach a 10 g part on the voice coil motor and use it as a vertical stage to move the part down, what acceleration can be achieved? what is the response time?
asundararaj  (posted 2021-04-01 01:49:53.0)
Thank you for contacting Thorlabs. The voice coil actuators have not been formally tested for the achievable acceleration and response time. We are looking to conduct more tests on these in the coming months and will publish any repeatable specs.
Chan Leh Mun  (posted 2021-01-18 02:28:36.843)
Hi What is the max current can be use? I thinking of using 3A for maybe 5 seconds to press a part down during UV curing. Then the coil should be at 1A current for another 5 seconds. This coil use to drive a Z axis for pick & place application. I wish to have up to 11.5N of force available during pressing down for 5 seconds.
YLohia  (posted 2021-02-16 02:07:39.0)
Hello, thank you for contacting Thorlabs. The voice coils have not been tested up to 3 A and the data we have is at 100% duty cycle. The voice coil got up to a temp of 24.5°C in the first 15 seconds of operation at 1 A and then rose to 33 °C over the following 15 seconds (Total 30 seconds of operation at 1 A). The maximum current we specify is 1.9 A. Based on the data we have at the moment and the time that you're looking to run the coil, we believe it can withstand your operating conditions but we cannot guarantee this due to the lack of formal testing with these parameters, but we cannot provide any guarantees at the moment.

Voice Coil Actuators

Item # Force Constanta
(Click for Graph)
Travel Coil
Assembly Mass
Maximum Currentb,c Mounting Features
(Click info for Diagram)
VC063/M 0.74 N/A
Click Here for Data
6.3 mm 7 g 7 g 1.9 Ω 167 µH 0.85 A @ 60 °C
1.76 A @ 200 °C
VC125/M 0.89 N/A
Click Here for Data
12.5 mm 9 g 10 g 3.5 Ω 316 µH 0.67 A @ 60 °C
1.45 A @ 200 °C
VC250/M 3.84 N/A
Click Here for Data
25.0 mm 38 g 97 g 5.1 Ω 1675 µH 0.89 A @ 60 °C
1.90 A @ 200 °C
VC500/M 3.99 N/A
Click Here for Data
50.0 mm 51 g 153 g 8.5 Ω 3274 µH 0.68 A @ 60 °C
1.45 A @ 200 °C
VC625/M 6.01 N/A
Click Here for Data
62.5 mm 58.5 g 369 g 9.8 Ω 4328 µH 0.89 A @ 60 °C
1.85 A @ 200 °C
  • Specified at the stroke position that provides the maximum continuous force when driven with 1 A current. See graph for continuous force across the entire stroke.
  • Specified for a 100% Duty Cycle
  • Severe damage to skin may occur on contact with exposed coil at temperatures > 60 °C. Damage will occur immediately on contact with the coil at temperatures > 200 °C.
Based on your currency / country selection, your order will ship from Newton, New Jersey  
+1 Qty Docs Part Number - Metric Price Available
VC063/M Support Documentation
VC063/MVoice Coil Actuator, 6.3 mm Travel
Lead Time
VC125/M Support Documentation
VC125/MVoice Coil Actuator, 12.5 mm Travel
Lead Time
VC250/M Support Documentation
VC250/MVoice Coil Actuator, 25.0 mm Travel
Lead Time
VC500/M Support Documentation
VC500/MVoice Coil Actuator, 50.0 mm Travel
Lead Time
VC625/M Support Documentation
VC625/MVoice Coil Actuator, 62.5 mm Travel
Lead Time