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Magnetic Particle Slip Clutches


DESIGN:
The magnetic particle slip clutch uses a sealed, steel outer housing and permanent
magnets arranged alternately (north and south poles) around a central hub.
The space between the housing and the magnets is filled with a ferromagnetic compound
(hysteresis particles). The particles align themselves along the flux pattern between the
steel housing and the magnets, creating a magnetic coupling between them.
The torque rating is determined by the number of particles added. The clutches
can be manufactured in the range from 2.82 to 39.55 N • cm. Because the coupling
is magnetic, torque value remains stable over time, temperature and speed value.
APPLICATIONS:
One of the applications is for paper feeding devices on scanners, copy machines
and fax machines. Paper is an abrasive material. Pages often stick together and
usually the thickness of the paper is different. The paper feeding device uses a
powered roller to “urge” the top sheet off an infeed stack toward the interface
between a second pair of rollers just beyond the urging mechanism. On the second
pair, one of the rollers is powered; the second is unpowered, spring-loaded against
the first and rides on a shaft linked to the chassis through the magnetic particle clutch.
With no paper in the feeder mechanism, the clutch slips; when a single page is drawn
between rollers, friction between the rollers and the paper remains high enough to
maintain slippage and paper passes through the mechanism normally.
If two or more pages are drawn in, the coefficient of friction between the pages is
not high enough to drive the unpowered roller. The slip clutch now acts as a drag
brake holding back the lower roller. The roller stalls, preventing all but the top page
from continuing through the feed device.
ZERO MAINTENANCE
CONSTANT TORQUE LEVELS
MATERIAL:
Shell - Steel
End Caps - Plastic
FEATURES:
Requires no power
Uses permanent magnets and magnetic particles
Long operational life
Sealed from contamination
SPECIFICATIONS:
d Tolerances:
Fig. 1: +0.1/0
Fig. 2: +0.022/0
*D1 Tolerance: 0/-0.033 (h8)
**Optional torques available only by special order.
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Product Name | Catalog PDF | Body Dia. | Bore Size (d) | Hub Dia. (D) | Hub Dia. (D₁) | Material (End Caps) | Material (Shell) | Max. Speed (RPM) | Operating Torque Range (N•m) | Overall Length (L) | Static Torque (N•m) | Stock | Price | Qty | Add to Cart |
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- Body Dia.
- Hub Dia. (D)
- Hub Dia. (D₁)
- Max. Speed (RPM)
- Operating Torque Range (N•m)
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- Static Torque (N•m)