Sepac UTSEB series for continuous duty robotics and automation

May 7, 2018 – Sepac’s new line of power-off brakes, the UTSEB series (Ultra Thin Spring-Engaged Brakes), is offered in five standard frame sizes from 1.14 to 2.68 inches in diameter and lengths from 0.47 to 0.67 inches.

The company explains the ultra-thin design provides a “very short package size” when the brake is mounted to the rear of a motor; and when mounted to the front, there is room for mounting a pulley. The series, it adds, offers static torques of over 22 lb-inchs. Used for power-off engagement applications, the UTSEB is equipped with a PWM controller to help reduce heat and save energy. Energizing the brake’s UL Class F insulated coil with 24 VDC, the PWM controller then provides 7 VDC to hold the brake in the power-on/brake-released position, which Sepac explains reduces ongoing heat generation by conserving current and wattage draw. When power is turned off, the coil’s electromagnetic field dissipates, allowing the springs to push the armature plate into contact with the friction disc material. This squeezes the friction disc between the pressure plate and the armature plate, thus transmitting torque to stop/hold the friction disc, hub, and shaft.