SEW-Eurodrive electromagnetic disk brakes

SEW-Eurodrive has released a range of motor-integrated electromagnetic disk brakes that can be customised to match the specific torque and voltage requirements for a wide variety of electric motor applications.

The brake features a spring-operated pressure plate that provides pressure against the brake disk. The brake is based on a two-coil design comprising an accelerator coil and a holding coil operated by an AC-to-DC intelligent rectifier circuit. When energised, the accelerator coil creates a strong magnetic force that counteracts the spring force and releases the pressure plate from the brake disk in a very short time. Once the brake has released, the holding coil retains the brake in the open position while the motor is running.

The accelerator coil design helps minimise start-up heating in the motor, reduces energy consumption and also increases the number of cycle times at which the motor can operate. Short response times at switch-off facilitate shorter braking distances, high repeat accuracy and an elevated degree of safety. These, plus the failsafe feature, ensure that the brakes are particularly suited to horizontal and vertical applications, such as hoisting.

The brake torque can be varied to suit the application requirements and range from a very low torque right up to 300% of motor torque. Brake operating voltages can also be varied to match the control requirement and span from 24 VDC to 500 VAC.