Electric Maintenance Service Co., Inc. 143 Bennett Street Bridgeport CT 06605 Tel: 203 333 6163 800 900 6163 FAX 203 334 2825 Electric Product And Repair Specialists Since 1918
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Electric motor application requirements for adjustable speed can be met with an eddy current drive. The eddy current drive is a combination of a constant speed AC induction motor, coupled to an eddy current clutch and controlled through a field coil. Varying the level of excitation to the field coil controls the output speed of the eddy current drive.

The induction motor is operated at a constant speed. There is no fixed linkage between the motor and clutch to cause mechanical wear. The eddy current coupling consists of three major components: a drum assembly connected to the rotor of the induction motor; the output clutch rotor assembly; and the field coil assembly that creates a magnetic field.
The drum assembly is the driving member and rotates at the speed of the constant speed motor. The drum is formed to fit around the output clutch rotor with a maintained air gap between the two units. With no current flowing through the field coil, the drum and rotor assemblies are free to rotate independently of each other.

A magnetic field in the clutch is created by a stationary field coil that is energized with a low voltage (45 or 90 volts DC) from the controller. The magnetic lines of force from the coil loop through the air gap and back to the coil forming a closed magnetic circuit.
ADVANTAGES OF EDDY CURRENT DRIVES

Of all electrical, adjustable speed drives, the eddy current drive is most frequently recommended for high torque applications. They provide high torque over a wide speed range. Because the motor on an eddy current drive constantly rotates at near synchronous speed, it can provide the breakaway and intermittent torque across all operating speed ranges up to 250% of full rated torque.

Eddy current drives also operate across a wider speed range than other types of drives. Because of its built in cooling fan running continuously at full speed an eddy current drive can operate over a 34:1 speed range with no heat damage.

These features of high torque and broad speed range permit engineers to specify smaller drives and motors for high torque applications.

Eddy Current Drive -Repair & Rebuilding

 
Electric Maintenance Service is the sole source for Louis Allis
Magnetek MC2 Controller main control boards.

We also repair Dynamatic and other circuit boards.
You may check our inventory of Used and Rebuilt Dynamatic Drives.

Or view our In-Stock New Drives

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