Product Description:

The MST161E-0050-FT-N0CN-D303 is a frameless synchronous torque motor built by Bosch Rexroth Indramat and supplied within the MST Synchronous Torque Motors series. It is intended for direct-drive rotary axes where high continuous torque at low speed is required, removing gear stages in indexing tables, printing cylinders, or extruders. The stator and rotor arrive as separate components so they can be mounted directly into the machine housing, reducing mechanical backlash. This arrangement also helps keep the drive train compact and responsive during low-speed rotary motion.

Under nominal conditions the motor draws a rated phase current of 16.7 A to deliver its continuous shaft power of 7.80 kW at 675 rpm. Peak demand can reach 45.8 A, enabling an acceleration torque of 260 Nm for short-term load surges. Ten embedded pole pairs generate a near-sinusoidal air-gap field that improves smoothness at low frequency. With a winding resistance of 3.0 Ω and inductance of 18.2 mH, the electrical time constant remains compatible with standard Rexroth drive inverters. A 3.6 l/min glycol-water loop must be maintained through the jacket to keep winding temperature below its Class F limit.

At constant duty the unit produces 110.0 Nm without thermal derating, and its standstill capability rises to 125 Nm when the rotor is locked. The torque constant of 6.01 Nm/A links phase current to mechanical output, while the back-EMF coefficient of 0.407 V/rpm indicates the inverter voltage needed as speed increases. Rotor inertia affects acceleration response and settling behavior during indexing cycles, so the direct-drive layout supports precise low-speed motion without gearbox compliance. Power leads are specified as AWG 12, which helps limit resistive loss under repetitive acceleration. That conductor size also helps maintain stable current delivery during repeated acceleration and deceleration cycles.