ST(K) TORQUE MOTORS

The ST(K)-family of torque motors are designed for direct drive applications without gearbox. Up to size 300 these motors are available as housed motors (ST) with bearing and sensor or as frameless motors (STK); size 400 and bigger are available as frameless motors only. The ST(K) offers within 6 frame sizes from 145 to 800mm and various stack length options in each size a continuous torque range from 14.6 to 2,708Nm (peak torque 43 to 9,258Nm). Optional cooling allows to increase the cont. torque to 29.9 bis 6,100Nm.

The use of Neodymium-Iron-Bor-magnets and the optimisation electromagnetical and thermal properties lead to a torque to weight ratio of up to 15 Nm/kg for the STK motors. In size 145 and 190 there are special high  precision versions with a cogging torque of less than 1% of the nominal value, so that these motors are suitable for applications requiring extreme smoothness and precision. As all direct drive motors the ST(K) motors offer very good dynamic response, precision and smoothness in case the connection to the load is very stiff. Another advantage is the possibility for a very compact machine design leading to very high reliability and low audible noise compared to conventional designs with gear motors.

The housed motors of the ST series are available with various flange and shaft options (including hollow shaft versions). Also various sensor options can be selcecte, including resolver, incremental and absolute encoders. Two windings for operation at three phase 400Vac are offered as standard; custom versions are available on request.