MSS312D-0060-FA-N0CN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS312D-0060-FA-N0CN-NNNN is part of the MSS Synchronous IndraDyn H Motors series and offers a rated power of 51.5 kW and a rated torque of 820 Nm. This motor features a maximum current of 250 Amps, a rated current of 93.2 Amps, and a maximum torque of 1950 Nm. With a coolant flow rate of 7.6 liters per minute and a pressure loss at minimum flow of 0.5 bar, it includes 7 pole pairs.
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Product Description:
The MSS312D-0060-FA-N0CN-NNNN is a liquid-cooled synchronous motor in the MSS IndraDyn H series manufactured by Bosch Rexroth Indramat. The unit operates as a direct-drive rotary actuator for industrial automation stages that demand high continuous torque at a comparatively low shaft speed, allowing machine designers to eliminate gearboxes and maintain precise position control. Its electromagnetic design uses permanent magnets on the rotor to synchronize mechanical rotation with the stator field, providing stable speed regulation under the load variations often encountered in large printing presses, test stands, and material-forming equipment.
During continuous operation, the motor delivers 51.5 kW while producing 820 Nm at a rated shaft speed of 600 rpm. This operating point requires a phase current of 93.2 A, and the corresponding rated power loss is 5.2 kW. Heat generated in the windings is removed by a water-glycol circuit that maintains a flow rate of 7.6 liters per minute through the cooling channels. The pressure drop across the motor remains 0.5 bar at this minimum flow rate, allowing it to operate with standard plant pumping systems. These electrical and thermal values help establish the operating requirements when the motor is connected to a compatible closed-loop drive system.
During transient operation, the drive can produce 1950 Nm by applying up to 250 A, providing additional torque for acceleration and disturbance rejection. A torque constant of 8.8 Nm/A relates stator current to mechanical output, while a voltage constant of 432 V/1000 rpm indicates the back electromotive force that the inverter must overcome. The machine has seven pole pairs, so a mechanical speed of 600 rpm corresponds to an electrical frequency of 70 Hz. Differential inductance is 3.2 mH along the direct axis and 7.8 mH along the quadrature axis, influencing vector-control bandwidth and flux-weakening margins. A stator winding resistance of 0.29 ohms contributes to copper heating and affects current ripple during pulse-width modulation.
