SEPAC Ultra Thin Spring Brake UTSEB Series

Description

Thinnest profile power-off brake available — 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 still room for mounting a pulley. Equipped with PWM controller to reduce heat and save energy for continuous duty applications.

• 1.02 to 3.29” diameter ; 0.47 to 0.75” length
• Bore sizes from 0.19 to 0.79”
• Static torque from 0.53 to 28.32 lb-in
• 24VDC coil voltage for 0.5 sec max; 7VDC holding voltage with PWM controller
• Modified designs and customized assemblies available

Performance / Mechanical Specifications	UTSEB Series — Model Size
		UTSEB – 102	UTSEB – 114	UTSEB – 154	UTSEB – 189	UTSEB – 221	UTSEB – 280	UTSEB – 328
Torque Rating (Static)	lb-in	0.53	1.42	2.83	5.49	11.68	28.32	44.25
	(Nm)	0.06	0.16	0.32	0.62	1.32	3.20	5.00
Recommended Max Speed	rpm	5000	5000	5000	5000	5000	5000	5000
Body Diameter	in	1.02	1.54	1.54	1.89	2.20	2.80	3.29
	(mm)	(26.0)	(29.0)	(39.0)	(48.0)	(56.0)	(71.0)	(83.5)
Overall Length (ref)	in	0.49	0.47	0.55	0.55	0.57	0.75	0.84
	(mm)	(12.6)	(12.0)	(14.0)	(14.0)	(14.5)	(19.0)	(21.3)
Pilot Diameter	in	0.28	0.35	0.35	0.59	0.59	0.87	1.85
	(mm)	(7.0)	(9.0)	(9.0)	(9.0)	(15.0)	(22.0)	(47.0)
Hub Bore Diameter	in	0.197	0.315	0.315	0.551	0.551	0.790	0.748
	(mm)	(5.00)	(8.00)	(8.00)	(14.00)	(14.00)	(20.00)	(19.00)

UTSEB Operation:

The magnet body is attached to the rear of the motor or bulkhead, and the hub is attached to the shaft with two set screws. When the coil is energized, the electromagnetic field attracts the armature plate and compresses the springs. This allows the friction plate to rotate freely with the hub and shaft.

Once energized with 24 VDC, the PWM controller will provide the 7VDC to hold the brake in the release position.
When power is turned off, the electromagnetic field dissipates, allowing the springs to push the armature plate into contact with the friction disk. This squeezes the friction disk between the pressure plate and the armature plate, thus transmitting torque, and stopping/holding the friction disc, hub, and shaft.

 

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