2015 Designer's Notebook - 97

The Magnetic Particle Clutch
The magnetic particle clutch is basically a very simple
device. The illustration shows the principal parts of the
clutch. At the inner-most position is a smooth solid rotor.
This rotor is surrounded by the drive cylinder. This cylinder
is also smooth on the inside and outside diameters, and is
supported by the drive cylinder shaft which is mounted in
ball bearings. Magnetic particles are located in the space
between the OD of the rotor and the ID of the drive
cylinder. The two matching stator frames surround the drive
cylinder and coil, and provide support for the bearings.

In normal operation, the drive cylinder is attached to the
drive mechanism, and the rotor is connected to the load.
With no current in the clutch, the load is not connected to
the drive. As the current is increased, more torque ability is
developed in the clutch and this torque is delivered to the
load. As long as the load torque requirements are less than
the torque setting in the clutch, the drive and the load are
100% coupled, with no slip. Slip only occurs when the
clutch torque is commanded to a level equal to or less than
the load requirements.

With no current in the coil, the particles are free to lie
loosely between the rotor and drive cylinder. When current
is applied to the coil, it sets up a magnetic field in the
stator. This field passes through the drive cylinder, through
the magnetic particles and into the rotor. The magnetic
particles line up with the magnetic field and couple the
rotor to the drive cylinder. As the current is increased, the
field strength increases. This coupling, or torque capacity,
is proportional to the amount of current in the coil.

The magnetic particle clutch is unique in that it acts like a
"torque valve", allowing any amount of torque to be passed
to the load. Long life, smooth starts, and silent operation
make it perfect for cycling and overload applications.
Offered in a variety of mounting styles in both clutch and
brake configurations, the machine designer can be assured
of finding the proper unit for his machine.

MAGPOWR Tech Notes: Low Speed Application
MAGPOWR clutches and brakes provide torque independent
of speed down to 0 rpm, however, the ability to dissipate
heat generated under slip conditions limits the torque at
higher slip speeds. The heat dissipation is dependent upon
the speed of the outer rotating member.

Clutches

The charts below list the maximum input speed each clutch
can be run at its rated torque with the process side locked
at 0 rpm. They also apply for brakes by defining the
maximum input speed the process can be run at rated
torque.

Global Clutches

Brakes
Torque
lb-ft

Max rpm
Input

C-1
C-3
C-3A
C-10
C-10A
C-10W
C-10WA
C-50
C-50A
C-50W
C-50WA
C-100
C-100A
C-100W
C-100WA

1
3
3
10
10
10
10
50
50
50
50
100
100
100
100

430
427
1170
145
431
1920
3020
38
135
350
810
34
87
272
497

Model

Torque
lb-ft

Maxrpm
rpm
Max
Input
Input

B-5
B-5A
B-25
B-25A
B-50
B-50A
C-10B
C-10AB
C-10WB
C-10WAB
C-50B
C-50AB
C-50WB
C-50WAB
C-100B
C-100AB
C-100WB
C-100WAB
B-7V
B-20V

5
5
25
25
50
50
10
10
10
10
50
50
50
50
100
100
100
100
7
20

116
428
47
161
41
108
145
431
1920
3020
38
135
350
810
34
87
272
497
55
35

Model
GCA
GCB
GCC
GCD
GCA-AIR
GCB-AIR
GCC-AIR
GCD-AIR

Torque
lb-ft
5.5
11
26
56
5.5
11
26
56

Max rpm
Input
257
137
66
25
613
332
184
92

Magnetic Particle Clutches & Brakes

Model

Global Brakes
Model
GBA
GBA-AIR
GBB
GBB-AIR
GBC
GBC-AIR
GBD
GBD-AIR
GBE
GBE-AIR
GBF
GBF-AIR

Torque
lb-ft
5.5
5.5
11
11
26
26
56
56
100
100
325
325

Max rpm
Input
92
350
39
191
38
141
19
73
22
87
12.9
41.8

Magnetic Particle Clutches & Brakes

97



Table of Contents for the Digital Edition of 2015 Designer's Notebook

Table of Contents
2015 Designer's Notebook - Cover1
2015 Designer's Notebook - Cover2
2015 Designer's Notebook - Table of Contents
2015 Designer's Notebook - 2
2015 Designer's Notebook - 3
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2015 Designer's Notebook - Cover3
2015 Designer's Notebook - Cover4
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