Electromagnetic clutch

However, because the activation energy dissipates as heat in the electromagnetic actuator when the clutch is engaged, there is a risk of overheating.

Within a relatively short time, the load is accelerated to match the speed of the rotor, thereby engaging the armature and the output hub of the clutch.

In most designs, springs hold the armature away from the rotor surface when power is released, creating a small air gap.

Electromagnetic clutches are also often found in AWD systems, and are used to vary the amount of power sent to individual wheels or axles.

This connects the air conditioning compressor's shaft end to a pulley driven by the engine's crankshaft through a belt.

Introduction – Multiple disk clutches are used to deliver extremely high torque in a relatively small space.

Running the clutches in an oil bath also greatly increases the heat dissipation capability, which makes them ideally suited for multiple speed gear boxes and machine tool applications.

How it works – Multiple disk clutches operate via an electrical actuation but transmit torque mechanically.

Springs hold the friction disks away from each other, so there is no contact when the clutch is not engaged, creating a minimal amount of drag.

Because torque is transmitted without any slippage, clutches are ideal for multi stage machines where timing is critical such as multi-stage printing presses.

Sometimes, exact timing needs to be kept, so tooth clutches can be made with a single position option which means that they will only engage at a specific degree mark.

They can be used in dry or wet (oil bath) applications, so they are very well suited for gear box type drives.

How it works – Electromagnetic tooth clutches operate via an electric actuation but transmit torque mechanically.

Springs hold the armature away from the rotor surface when power is released, creating a small air gap and providing complete disengagement from input to output.

Because of their fast response, they can also be used in high cycle application, such as card readers, sorting machines, and labeling equipment.

Depending upon the output torque required, this pull eventually can match the input speed, giving a 100% lockup.

When current is removed from the clutch, the armature is free to turn and no relative force is transmitted between either member.