The ST(K)-family of torque motors are designed for direct drive applications avoiding the use of gearboxes. 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-Boron-magnets and the optimisation of 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.
Torquemotor for harsh environment
Thus, MACCON currently has 3 rotors structures that are reliable for different applications and environments:
The standard torque motor or alternator rotor with glue-bonded magnets, suitable for slow speeds in direct drive in dry workshop environment and for well-sealed and non-condensing external applications.
The torque motor or alternator rotor with glue-bonded and encapsulated magnets with peripheral bandage under tensile strength enabling higher speed and / or vibratory applications and / or in the presence of moisture to be addressed. Moreover, this rotor is suitable for applications of motor internal parts immersed in oil under equipressure as in the applications of propulsion of underwater vehicles in deep depth. This rotor is more resistant to external aggressions than the standard rotor but is not immersible in water. Moreover, this rotor is mechanically interchangeable with standard rotors with a slightly higher weight and inertia.
The torque motor rotor without glue and polymers with magnets integrated in mechanical parts. It is intended for applications of rotors in vacuum and ionizing radiations and motors integrated in machines linked to processes with the possibility of infiltration of solvents aggressive for glues despite the sealing.This rotor is interchangeable with the standard rotor and has a slightly higher weight and inertia than the standard one.