Proof that good things come in small packages

The client required a 4Nm brake design solution, reduced in size to fit its existing motor frame with flange square mounting. The brake incorporated a custom flange and reverse mounted brake hub, to keep the overall length as compact as possible. This allowed the brake air gap to be pre-set by SG Transmission. A unit was then supplied which allowed the customer to fit the brake straight into its motor, significantly reducing assembly time.

A permanent magnet brake is a ‘power-off’ device which is designed so that when power is removed from the unit, the magnetic energy of a permanent magnet disc is channelled and controlled to attract the steel armature plate across an air gap. Therefore, holding it in its place against a stationary field housing to give the required braking effect.

Adam Russell, design engineer, at SG Transmission, said: “We are finding that more and more of our clients are moving away from spring applied brakes and switching to permanent magnet brakes when controlling servo motors. This is due not only to the fact that they are zero backlash, but also their compact size and high reliability.”