Permanent Magnet Brakes

PMB Series

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
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
Model: PMB - 126
Model: PMB - 157
Model: PMB - 197
Model: PMB - 252
Model: PMB - 319
Model: PMB - 398
Model: PMB - 496
Model: PMB - 634
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.