Product Description:

The MST290B-0018-FT-N0SN-NNNN is a frameless synchronous torque motor produced by Bosch Rexroth Indramat in the MST Synchronous Torque Motors series. By delivering high torque directly to the load without mechanical reduction, this motor suits rotary tables, extruders, printing cylinders, and similar assemblies that demand precise angular control at low speed. Integrated into a servo loop, it provides smooth continuous rotation, accurate position holding, and repeatable start-stop cycles that are essential for modern automated production cells.

Under continuous operation, the motor supplies 220 Nm at a shaft speed of 180 rpm, producing 4.1 kW while drawing a rated current of 14.8 A. The electromagnetic design yields a torque constant of 14.90 Nm/A, so drive current translates linearly into output torque, and the stator inductance of 34.8 mH helps limit ripple when PWM inverters switch phases. A winding resistance of 6.6 Ω contributes to copper losses at nominal load, while the leakage capacitance of 8.4 nF affects the grounding scheme of the machine frame. Thirty pole pairs permit smooth commutation, and the power leads are sized at 1.5 mm². The rotor-stator assembly has a mass of 17 kg, which keeps axis inertia moderate while supporting thermal stability.

Peak conditions are handled through 460 Nm of instantaneous torque and a maximum phase current of 60 A, allowing rapid indexing before settling into its rated zone. Electrical commutation remains stable up to 340 rpm, which is the listed maximum electrical speed. Cooling is managed by water cooling through an open aluminum jacket, and the sleeve measures 105 mm in length with an outside diameter of 310 mm so it can fit inside tight machine housings. The assembly carries an IP00 ingress rating, so it must be installed inside a protected enclosure. Static holding capability is 245 Nm at 16.5 A, and smooth low-speed interpolation is maintained by the motor’s electromagnetic design.