MSS312B-0035-FA-N0CN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS312B-0035-FA-N0CN-NNNN is part of the MSS Synchronous IndraDyn H Motors series and features liquid cooling with a 380 mm cooling jacket length. This motor provides a rated power of 23.8 kW and a rated speed of 350 rpm, delivering a maximum torque of 1550 Nm. It has an axial electrical connection, a stator mass of 128.7 kg, and a maximum current of 170 A.
Internal Product Review
The MSS312B-0035-FA-N0CN-NNNN is a Bosch Rexroth Indramat synchronous IndraDyn H motor with liquid cooling and an axial coolant connection. Rated output of 23.8 kW at 350 rpm supports strong low-speed drive performance in demanding industrial service. A maximum torque of 1550 Nm stands out as a key strength for high-load motion applications.
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Product Description:
The MSS312B-0035-FA-N0CN-NNNN is a liquid-cooled synchronous motor produced by Bosch Rexroth Indramat within the MSS Synchronous IndraDyn H Motors series. The motor is intended for direct-drive positioning or rotary tables where high continuous torque at low speed supports precise machining or forming operations. Its integrated cooling jacket removes heat from the stator windings, allowing the unit to sustain nominal output without the larger frame required by an air-cooled design. By coupling directly to the load, the motor eliminates gearboxes and lowers maintenance demands in industrial automation systems such as presses, extruders, and heavy-duty indexers.
At the nominal operating point, the motor delivers 23.8 kW of mechanical power while rotating at 350 rpm. This low-speed, high-power combination is enabled by the liquid cooling circuit that maintains the copper temperature. A back electromotive force of 686 V/1,000 rpm indicates the voltage that the drive must overcome and helps guide controller selection for regenerative events. The recommended supply conductors have a cross-sectional area of 16.0 mm², providing suitable ampacity and minimal voltage drop for the high torque currents. The cooling jacket has an outside diameter of 340 mm, allowing the unit to fit into compact spindle housings while leaving space for axial coolant ports and feedback devices. Both coolant and power leads exit axially, so the motor can be recessed into machine frames without radial cable loops.
During clamped positioning, the rotor can continuously hold 650 Nm at zero speed while drawing a standstill current of 62.5 A. Transient overloads are handled with a phase current of up to 170 A, allowing the motor to accelerate heavy loads with a peak torque of 1550 Nm without stalling. The winding resistance is 0.47 Ω at 20 °C, which helps limit resistive losses during operation. The liquid jacket spans 380 mm in length and stabilizes thermal gradients along the stator’s 128.7 kg mass. Its axial coolant pathway simplifies manifold design and maintains uniform flow through the entire sleeve.
