The permanent magnet power off brake is designed so that when the power is off, the brake is engaged (power-off brake engagement).
This brake can be used in fail-safe applications to automatically stop the drive when the electrical power fails, this means that when the power is removed from the unit, the armature becomes engaged with the brake field. Therefore the permanent magnet brake is typically used for static holding or parking brakes (E-stop brakes), with some dynamic capability.
The permanent magnet power off brake is essentially zero backlash creating an increased level of safety and accuracy. Unlike conventional fail-safe br Read More...akes which often include splines, the permanent magnet brake’s construction may be considered as ‘torsionally rigid’ where linear movement is achieved via deformation of a diaphragm spring, not the clearance between rotating parts (see zero backlash brakes).
The multi pole version of the permanent magnet brake provides a solution to give increased torque in the same size envelope. The torque is boosted by doubling the number of working poles and this technology can also be applied to clutches and power-on brakes.
The permanent magnet power off brake can be mounted in any orientation and due to its precision, is suited to high safety applications in the robotics, medical and military sector.
At SG Transmission, we use rare earth magnets to create a higher flux density (tesla/gauss) than comparable, older design ferrite magnets. These rare earth magnets allow for very high torque densities in small envelopes. Our design engineers can create customised armature styles depending on the application.
SG Transmission brakes can be supplied, as standard with C.L., C.C. and C.R. armature types and feature bores and keys to suit specific requirements.
This is a SG Transmission type 62 permanent magnet, power-off brake. Click here for the full brake datasheet.
Alternatively, to view the type 52, power-on brake, click here.