2015 Designer's Notebook - 148

Perma-Tork® Design Features
Operating Principles
Perma-Tork clutches and brakes are designed
to handle any light torque control application.
High energy, multipole magnets are used to
establish magnetic fields. Therefore, an
outside power source is not required for torque
control The strength of the magnetic field is
controlled using two different methods:

A. Twin Magnet
This style uses the relative position of the
magnetic poles to determine the field
strength.

Hysteresis Disc

These two methods of controlling magnetic
field strength are incorporated into two types
of magnetic clutches and brakes:

Magnetic Particle (PB)

1. Hysteresis

The magnetic particle units utilize the flux
gate design. In the maximum position,
magnetic lines of force pass through the flux
gate and across the power gap. In the
minimum position, magnetic lines of force
are "short-circuited" by the flux gate. When
magnetic lines of force pass through the
powder gap, the particles form chains
between the flux gate and the rotating disk.
These chains produce a retarding force or
torque that is unaffected by speed.

2. Magnetic particle

Hysteresis (HC, HB)
Constant torque with respect to speed
The hysteresis units utilize the twin magnet
construction (except for the HB 1/2 which uses
a flux gate). When in the maximum position,
similar magnetic poles are on opposite sides
of the disk. Magnetic lines of force are
directed through the very narrow width of the
hysteresis disk which produces high magnetic
field strength. In the minimum position, lines
of force are not concentrated and field
strengths are low.
As the hysteresis disk rotates through the field
established by alternating poles, the magnetic
state of the disk alternates. The resistance of
the disk to change magnetic states, produces
a retarding force. This retarding force is
converted to a smooth consistent torque
unaffected by speed.

B. Flux Gate
This style uses the position of the flux gate
relative to the magnetic poles to determine
the field strength.

Permanent Magnet Clutches & Brakes

Housing

148 Permanent Magnet Clutches & Brakes

Constant torque with respect to speed



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