Torque motors to replace gearbox mechanisms
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Parker Hannifin - Electromechanical and Drives Division product story
Edited by the Engineeringtalk editorial team
Sep 4, 2008
The TMW series torque motors from Parker Hannifin are designed to help end users of heavy duty industrial machinery replace traditional gearbox mechanisms with an efficient direct drive system.
The TMW series is based on a proven design of the permanent magnet, brushless servo motor, which produces high levels of torque at low operating speeds.
Used in combination with Parker AC890 variable speed drives, this enables screws to be connected directly to a motor, with speed and torque being controlled by the drive.
Unlike traditional gearbox systems, this allows operating parameters to be varied infinitely within the performance envelope of the motor.
The TMW motors are virtually noiseless, have a far smaller footprint and can be retrofitted in a matter of hours.
The range of products feature an integrated thrust bearing, which can be sized according to the application, plus an innovative screw extraction mechanism to simplify installation and maintenance.
In addition, Parker is able to offer both standard and customised mechanical interfaces for shafts and barrels, with the shaft being hollow to improve cooling.
The TMW range can be used with machinery requiring from 1,200Nm to 22,000Nm of torque and running at speeds of between 50rpm and 500rpm.
Parker quotes typical efficiency improvements from a TMW motor and AC890 drive combination, compared with a traditional gearbox based system, as being up to 10 per cent.
Used in conjunction with the variable speed drives, the torque motors are intended primarily for use with plastics and rubber extrusion machines, and injection moulding, mixing, crushing and winding equipment.
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