Dunkermotoren E90R Power-Off Brake

The Dunkermotoren E90R is a spring-force power-off brake that holds a motor axis the instant supply voltage is removed, so vertical loads, positioning stages and gravity-loaded axes stay put through an emergency stop or power failure. Because the holding force comes from a spring rather than a permanent magnet, its 1Nm nominal torque (0.60–1.20Nm over the temperature range) stays predictable as the motor heats up or the duty cycle changes. In combination with Dunkermotoren's brushless motors the E90R integrates into the motor's profile housing at IP65, pairing with BG66 and BG75 motors in that configuration. Where a standalone mount is preferred, it can also be fitted openly or under a cover, connecting via 300mm grey leads (UL style 1569 AWG22) to a 24Vdc supply. The E90R is also available with manual unlocking and with manual release; on the release version a Ø3.6mm hole in the lever takes a Bowden cable, so an operator can free a jammed axis from the front or the rear without power. Its 1Nm holding and mid-range Ø59mm body suit general-duty servo and stepper axes where a vertical load, clamp or positioning stage must not drift the moment power is lost, typical in motion control, factory automation and machine build. It's part of Dunkermotoren's full power-off brake series, which spans the permanent-magnet E22R and E100R and the spring-force E38R, E90R, E310R and E600R for larger axes, plus the power-on E46A to E605A range for applications requiring a normally-braked default state. All rated values apply in the run-in condition.