Force Control Industries’ Two Speed Drive is designed for applications up to 30 hp that require a high turndown ratio while maintaining high torque. Unlike variable speed motors that lose torque or develop heat problems at very low speed, the Two Speed Drive eliminates those problems with secondary speeds as low as 60:1 while still maintaining full torque continuously.
This drive includes a brake motor with a low-speed drive built in, providing 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 suited for dusty, dirty or wet indoor/outdoor environments. The drive is available in two versions: the Posidyne air-actuated unit and the electrically activated MagnaShear model. According to the vendor, its Oil Shear Technology is the reason its brakes do not need constant maintenance, adjustment, disc replacement, and last up to 10 times longer than standard dry friction brakes. Oil Shear Technology is the function of a boundary layer of transmission fluid in shear between the friction disc and drive plate. As the parts come together, the fluid under shear will transmit torque between the two parts as well as absorb heat. This eliminates direct contact of the friction discs and drive plates during high-speed slip. Heat from the friction surface is dissipated as the fluid circulates to the housing.