KEB's Combinorm Electromagnetic Clutch allows
power to be transferred from a primary drive
shaft to a secondary load shaft. The Combinorm
clutch product is electrically engaged and
can be configured in inline or offset configurations.
KEB or customer supplied hubs and pulleys
can be incorporated into the clutch along
with integrated bearings. First, let's get
acquainted with the main clutch components.
The primary drive shaft typically contains
a stationary electromagnet which is fixed
with a flange or torque tab. A rotor is fixed
to the primary driving shaft with a key or
other connection. Next, an armature is riveted
to a flat spring. The flat spring is then
riveted or screwed to a hub, or in this case,
a pulley, which is then connected to a secondary
shaft with a belt. Here's how the clutch works.
When a DC voltage is applied to the electromagnet
coil a magnetic field is created. The magnetic
circuit passes through the clutch rotor and
armature. The force is large enough to deflect
the flat spring and the armature is pulled
across a small air gap into the rotor face.
The friction between the rotor and armature
allow the driving shaft and armature to rotate
at the same speed. When electrical power is
removed from the coil the flat spring returns
and pulls back the armature. Without a friction
connection the two shafts rotate independently.
