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.
The non-commutated motor construction increases reliability. The direct coupling of the motor to the load allows for fast acceleration / deceleration and high speed operation.
Very high speeds and accelerations can be easily achieved.
The moving part needs to be supported by a mechanism supplied by the customer.
This type of motor may be used in conjunction with a position sensor and a motion controller for accurate positioning.
The other applications of the voice coil motors are force and pressure control.
All the following motors can be manufactured with metric threads in production quantities.
Mounting hardware is available in various lengths and styles and may be obtained at 

Linear DC Motors Catalog in PDF