Product Description:

The MST161E-0050-FT-N0CN-NNLE is a permanent-magnet torque motor produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. It is intended for direct-drive rotary axes in industrial automation, where high continuous torque at low speed is required to position tables, extruders, or winders without mechanical gearboxes. Power and sensor leads exit axially through a sealed cable gland, which keeps the cooling channel uninterrupted and simplifies mounting.

At its rated operating point, the motor supplies 7.80 kW of mechanical output. This power corresponds to a continuous torque of 110.0 Nm delivered at a shaft speed of 675 rpm, providing stable drive force for long production runs. For short overload intervals, the electromagnetic stack can reach 260 Nm, giving extra margin for acceleration or cutting spikes. Heat generated by copper and iron losses, measured as 2.51 kW of power dissipation, is removed through liquid cooling, which circulates water-glycol inside an integrated cooling jacket; the circuit requires 3.6 l/min of flow to hold temperature. Dual KTY84-130 and SNM-150 DK sensors report coil temperature to the drive, and the thermal casing isolates the coolant from nearby machine elements.

A torque constant of 6.01 Nm/A links controller current to shaft output, while the back-EMF coefficient is 0.407 V per min⁻¹, which indicates the voltage the inverter must supply as speed rises. Phase inductance of 18.2 mH moderates current rise, and the 3.0 Ω winding resistance determines steady-state copper loss. The rotor stays dynamically balanced up to a maximum electrical speed of 1050 rpm, and beyond that point the drive should limit frequency to avoid overshoot. Thermal response is quick, and the stator reaches 63% of its final temperature in 3.0 min, so coolant flow can be adjusted almost in real time.