H2W Technologies has developed what it claims to be the world’s highest force commercially available non-commutated DC linear actuator, otherwise known as a direct drive voice coil actuator. The model NCC08-75-3000-3X is capable of generating a continuous force of 300lbs (1330N) and a peak force of 900lbs (4000N) at a duty cycle of 10% (i.e. 1 second on, and 9 seconds off). A moving mass of just under 8lbs [3.6kg] allows for a maximum theoretical continuous acceleration of nearly 38 ’s.
The NCC08-75-3000-3X has a stroke of 0.8” (20mm) and a motor constant of 17.6lbs/sqrt(watt) (323 N/sqrt(watt)). The voice coil motor requires 4A of continuous current and 12A of peak current in order to generate the specified forces. The massive actuator has a diameter of 7.47” (190mm) and a retracted length of 8.15” (207mm).
The moving coil design ensures a hysteresis free movement as the bobbin is constructed of aluminum while the non-commutated coil allows for ripple-free motion and no cogging. The voice coil actuator has been designed with a thru hole in the magnet and coil assemblies. This allows for the integration of a shaft and bearing system through the center of the motor. Alternatively, the actuator can be used in many applications where a thru hole would be necessary such as focusing applications or fibre optic routing.