Permanent Magnet Brakes from SEPAC, Inc.

PMB Series(Must be used with PWM Controller)

Permanent Magnet Brakes

1.1 to 6.3” diameter ; 1.1 to 3.6” length
Bore sizes from 6 to 40 mm
Static torque from 0.3 to 103.3 lb-ft
24 VDC coil voltage
Dry operation
Modified designs and customized assemblies available

Available Downloads

Resources

Questions? (607) 732-2030

Performance / Mechanical Specifications	PMB Series - Model Size
		PMB - 110	PMB - 126	PMB - 157	PMB - 197	PMB - 252	PMB - 319	PMB - 398	PMB - 496	PMB - 634
STP File Model		Model: PMB - 110 3D	Model: PMB - 126 3D	Model: PMB - 157 3D	Model: PMB - 197 3D	Model: PMB - 252 3D	Model: PMB - 319 3D	Model: PMB - 398 3D	Model: PMB - 496 3D	Model: PMB - 634 3D
Torque Rating (static)	lb-ft	Model: PMB - 110 0.3	Model: PMB - 126 0.7	Model: PMB - 157 1.5	Model: PMB - 197 3.3	Model: PMB - 252 6.6	Model: PMB - 319 13.3	Model: PMB - 398 26.6	Model: PMB - 496 53.1	Model: PMB - 634 103.3
	(Nm)	Model: PMB - 110 (0.4)	Model: PMB - 126 (1.0)	Model: PMB - 157 (2.0)	Model: PMB - 197 (4.5)	Model: PMB - 252 (9.0)	Model: PMB - 319 (18.0)	Model: PMB - 398 (36.0)	Model: PMB - 496 (72.0)	Model: PMB - 634 (140.0)
Body Diameter	in	Model: PMB - 110 1.10	Model: PMB - 126 1.26	Model: PMB - 157 1.58	Model: PMB - 197 1.97	Model: PMB - 252 2.52	Model: PMB - 319 3.19	Model: PMB - 398 3.98	Model: PMB - 496 4.96	Model: PMB - 634 6.34
	(mm)	Model: PMB - 110 (28)	Model: PMB - 126 (32)	Model: PMB - 157 (40)	Model: PMB - 197 (50)	Model: PMB - 252 (64)	Model: PMB - 319 (81)	Model: PMB - 398 (101)	Model: PMB - 496 (126)	Model: PMB - 634 (161)
Overall Length (ref)	in	Model: PMB - 110 1.14	Model: PMB - 126 1.33	Model: PMB - 157 1.50	Model: PMB - 197 1.73	Model: PMB - 252 1.82	Model: PMB - 319 2.16	Model: PMB - 398 2.58	Model: PMB - 496 2.99	Model: PMB - 634 3.58
	(mm)	Model: PMB - 110 (29)	Model: PMB - 126 (34)	Model: PMB - 157 (38)	Model: PMB - 197 (44)	Model: PMB - 252 (46)	Model: PMB - 319 (55)	Model: PMB - 398 (66)	Model: PMB - 496 (76)	Model: PMB - 634 (91)
Pilot Diameter - Max	in	Model: PMB - 110 0.43	Model: PMB - 126 0.49	Model: PMB - 157 0.75	Model: PMB - 197 1.02	Model: PMB - 252 1.38	Model: PMB - 319 1.65	Model: PMB - 398 2.05	Model: PMB - 496 2.44	Model: PMB - 634 3.15
	(mm)	Model: PMB - 110 (11.0)	Model: PMB - 126 (12.5)	Model: PMB - 157 (19.0)	Model: PMB - 197 (26.0)	Model: PMB - 252 (35.0)	Model: PMB - 319 (42.0)	Model: PMB - 398 (52.0)	Model: PMB - 496 (62.0)	Model: PMB - 634 (80.0)
Hub Bore Diameter	in	Model: PMB - 110 0.236	Model: PMB - 126 0.236	Model: PMB - 157 0.394	Model: PMB - 197 0.591	Model: PMB - 252 0.709	Model: PMB - 319 0.787	Model: PMB - 398 1.181	Model: PMB - 496 1.181	Model: PMB - 634 1.575
	(mm)	Model: PMB - 110 (6.00)	Model: PMB - 126 (6.00)	Model: PMB - 157 (10.00)	Model: PMB - 197 (15.00)	Model: PMB - 252 (18.00)	Model: PMB - 319 (20.00)	Model: PMB - 398 (30.00)	Model: PMB - 496 (30.00)	Model: PMB - 634 (40.00)

PMB Operation:

With current off to the electric coil, the permanent magnet provides ongoing magnetic flux to engage the armature plate with the brake’s inner and outer friction faces. The load attached to the hub/diaphragm spring/armature plate assembly is held continuously without power consumption.

When current is applied to the coil, the permanent magnet flux path is counteracted, thereby reducing the magnetic force at the friction face contact points to zero. This allows the diaphragm spring to pull the armature plate away from the magnet case, allowing the load to rotate freely — only while power is applied to the coil.