Product Description:

The MRS382F-2N-0230-NNNN is a frameless synchronous motor stator-rotor set produced by Bosch Rexroth Indramat within the MRS Synchronous IndraDyn H Motors series. Delivered without an outer housing, it is intended to be pressed into the machine structure using a stepped interference-fit mounting arrangement. Once integrated, the motor supplies direct-drive motion for industrial automation tasks that demand very high torque at low rotational speeds. This gearless arrangement reduces mechanical play and provides a rigid connection to the driven equipment.

Under continuous operating conditions, the unit produces 40.9 kW of mechanical power while turning at a nominal speed of 180 rpm. To achieve this speed, the windings draw a rated current of 83.6 A and develop a sustained shaft torque of 2170 Nm. For short overloads, the electromagnetic system can raise torque to a peak of 4500 Nm when the drive supplies up to 250 A. Nine pole pairs establish the electrical frequency relationship between the stator and rotor fields. A winding resistance of 0.9 Ω determines the copper losses that must be dissipated through the surrounding machine frame. The 230 mm internal rotor diameter provides sufficient clearance for coupling to large-diameter shafts or rotary tables.

The motor has a torque constant of 26.15 Nm/A, so each ampere of phase current contributes a corresponding amount of torque to the load. Back EMF scales with speed according to a voltage constant of 1842 V/1000 rpm, which supports proper selection of the inverter and its DC bus. The magnetic circuit has a longitudinal inductance of 13 mH, which affects current rise time and control-loop tuning. The rotor inertia is 2.41 kg·m², supporting stable motion during slow indexing and rapid load changes. Its 120 kg rotor mass also contributes to the rotating assembly’s momentum and must be considered when calculating acceleration and deceleration profiles.