Product category:
Stepper and Servo Drives, Motors, Controls
News Release from: Micromech | Subject: ST torque motors
Edited by the Engineeringtalk Editorial
Team on 22 March 2006
High torque to size ratio for direct
drive motors
Direct drive torque motors have a high torque to size ratio, eliminating the need for gear reducers, and are designed to be an integral part of a machine.
The ST direct drive torque motors have a high torque to size ratio, eliminating the need for gear reducers, and are designed to be an integral part of a machine Available from Micromech, the torque motors are a packaged low inertia motor capable of acceleration rates up to 20,000rad/s2 available in 145 and 190mm frame sizes
This article was originally published on Engineeringtalk on 26 Feb 2001 at 8.00am (UK)
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They can deliver continuous torques from 15 to 115Nm that is achievable in standard windings optimised for 500, 1000 and 1500rev/min.
Smooth rotation is achievable at low speeds.
The continuous torque to weight ratio is up to 3Nm/kg and peak torque to weight ratio up to 7Nm/kg.
There are options of 60 or 75mm diameter solid shaft and hollow versions, and optional resolver or sincos encoder feedback.
Also available are the STK frameless kit motors for use as an integral of a machine.
They are capable of rated continuous torques of 15 to 2708Nm with natural convection.
They can reach 6000Nm using fluid cooling.
The peak torque is three times higher than the rated torque where up to 9258Nm is available even up to the rated speed.
The large-diameter hollow shaft provides an internal clearance between 56 and 630mm with six external diameters from 145 to 800mm.
The ST system suits applications wanting no backlash, needing low speed of rotation, high torque, compactness and dynamic performance.
The kit model can be integrated within machine tools such as rotary tables and grinding heads where they frequently require a large-diameter hollow shaft as well as high accuracy and speed regulation.
By eliminating a gearbox, the packaged drive is more suitable for printing machines, bending machines or machine tools which require extremely smooth rotation, especially at very low speed and very high accuracy.
Frequently there is also a requirement for a hollow shaft.
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