Two Speed Drive


Force Control Industries announces their Two Speed Drive for applications up to 30 HP that require a high turndown ratio while maintaining high torque. Unlike variable speed motors which lose torque or develop heat problems at very low speed, the Force Control Two Speed Drive eliminates those problems with secondary speeds as low as 60:1 while still maintaining full torque continuously.  This unique drive includes a brake motor with a low speed drive built in. This provides precise low speed control with continuous high torque as well as high speed capability in one compact package.   Additional benefits include the simplicity of a mechanical drive which is easily maintained by local mechanical maintenance staff, and not affected by electrical line spikes, lightning, or other electrical issues. Totally enclosed units are ideal for dusty, dirty, or wet environments, even outdoors.  Force Control Two Speed Drives are ideal for transfer or lift systems, rotary components, car spotters, cranes, winches and more.

The Posidyne Two Speed Drive consists of a high speed motor connected through a spring set friction stack operating as a clutch and a brake (primary brake clutch) to a 4 lug shaft mounted to a worm gear. The worm gear connects to a worm which has a secondary drive consisting of a small low speed motor connected to one end and a spring set brake (low speed brake) to the other end.

The spring set brake on the secondary drive is set while in operation, thus holding the worm and worm gear set locked. The primary brake clutch is spring set so the entire drive is locked. To actuate high speed (main motor only) the primary brake clutch is released and the main motor functions normally. To stop the high speed motor the primary brake clutch is engaged connecting it to the locked secondary drive causing the main motor to stop. To operate the drive in low speed, the low speed brake is released, the primary brake clutch is released, and the low speed motor drives through the gear ratio driving the main motor at low speed.

The MagnaShear Two Speed Drive is the same concept as the air actuated units except that the brakes are actuated by an electrical coil instead of an air piston. High speed and low speed modes are selected by energizing the appropriate electrically controlled coils.  The spring-set braking mode is selected when both coils are de-energized, allowing the springs to engage both disc stacks to stop the drive system. Low speed is selected by releasing both brakes and energizing the secondary low speed feed motor.

This unique design provides internal surge suppression, standard electrical connections, and modular assembly designs.  They are suitable for standard NEMA motor mounting and are available for a wide range of gear ratios.  Each Force Control Two Speed drive is totally enclosed and impervious to dirt, dust and harsh environments. 


  • for applications up to 30 HP
  • secondary speeds as low as 60:1
  • Totally enclosed units
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