MSS312F-0028-FR-N0CN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS312F-0028-FR-N0CN-NNNN is part of the MSS Synchronous IndraDyn H Motors series and delivers a rated power of 28.6 kW and a rated torque of 975 Nm at a rated speed of 280 rpm. This motor has a maximum current of 180 Amps, a maximum speed of 1200 rpm, and a stator weight of 179.5 kilograms. It features direct-axis and quadrature inductances of 15 mH and 18.8 mH, as well as a rated current of 62 Amps.
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Product Description:
The MSS312F-0028-FR-N0CN-NNNN is a liquid-cooled synchronous motor built by Bosch Rexroth Indramat for the MSS Synchronous IndraDyn H Motors series. It functions as the rotary drive element in industrial automation systems that demand continuous torque at low base speeds, such as extruders, test stands, and large gear stages. Liquid circulating through an integrated jacket removes heat directly from the stator, allowing the motor to sustain its rated load without requiring an oversized frame.
Under nominal conditions, the motor produces 975 Nm at a shaft speed of 280 rpm, yielding a mechanical output of 28.6 kW while drawing a current of 62 A. Maintaining this operating point requires a coolant flow of 7.7 L/min through the radial G 1/4 threaded port. Conductors with a cross-sectional area of 16 mm² connect the stator windings to the inverter, minimizing voltage drop at the full rated current. The 179.5 kg stator provides thermal mass and rigidity for heavy-duty mounting. Electrical behavior is influenced by a direct-axis inductance of 15 mH and a quadrature-axis inductance of 18.8 mH, which affect current regulation and field-oriented control bandwidth. The winding resistance is 0.59 ohm, contributing to copper losses and the expected temperature rise during steady operation.
For short-term acceleration or process upsets, the shaft can deliver up to 2275 Nm, and its mechanical speed can rise to 1200 rpm when the inverter supplies a peak current of 180 A. Torque generation scales with current according to a torque constant of 15.72 Nm/A, which helps determine the current required for a commanded load. Back electromotive force follows a voltage constant of 930 V/1000 rpm, supporting inverter voltage selection and DC-bus planning. The direct cooling circuit helps control stator temperature during rapid load changes, while the motor’s electrical characteristics support responsive current regulation. These operating capabilities allow the motor to handle temporary overloads without changing its nominal continuous-duty operating point.
