MST450B-0012-FT-N0RN-NNNN Bosch Rexroth Indramat
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MPN: R911400249
The Bosch Rexroth Indramat MST450B-0012-FT-N0RN-NNNN is part of the MST Synchronous Torque Motors series and delivers a rated power of 10.50 kW, rated torque of 540 Nm, and operates at a rated speed of 185 rpm. This motor has a maximum torque of 1350 Nm and a maximum current of 65.0 Amps. It requires a power wire cross-section of 2.5 mm² and a coolant flow of 4.3 liters per minute.
Internal Product Review
The MST450B-0012-FT-N0RN-NNNN is a Bosch Rexroth Indramat synchronous torque motor rated for 540 Nm at 185 rpm. This motor shows strong low-speed drive capability with 640 Nm standstill torque and 10.50 kW rated power. A maximum torque of 1350 Nm makes this unit an excellent choice for demanding direct-drive applications.
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Product Description:
The MST450B-0012-FT-N0RN-NNNN is a direct-drive synchronous torque motor manufactured by Bosch Rexroth Indramat under the MST Synchronous Torque Motors series. This frameless stator and rotor set is intended for rotary positioning tasks where high continuous torque and precise speed regulation are required, such as indexing tables or compound extruder drives in automated production lines. By eliminating gear stages, the motor transmits torque directly to the load, reducing backlash and simplifying mechanical assemblies in motion-control platforms. Its direct-drive layout also supports smooth low-speed operation in applications that need accurate rotary control.
At its continuous operating point, the unit delivers 10.50 kW of mechanical power while turning at 185 rpm, and this output corresponds to a rated torque of 540 Nm. To achieve this condition, the drive supplies a rated current of 20.4 A through copper conductors sized at 2.5 mm², and the winding pair has 2.4 Ω of resistance together with 17.8 mH of inductance, which shapes the electrical response. A torque constant of 26.23 Nm/A links stator current to shaft torque, while the voltage constant of 1.455 V per rpm determines the back EMF generated at speed. For short overloads, the electromagnetic system can reach a peak torque of 1350 Nm without loss of synchronism, giving the motor a substantial dynamic reserve during acceleration or load changes.
Dynamic operation is limited by a maximum phase current of 65.0 A and an electrical top speed of 350 rpm, and these values set the acceleration range when the motor is paired with an IndraDrive amplifier. During locked-rotor positioning, the motor can sustain a standstill torque of 640 Nm with a standstill current of 24.4 A, and the thermal mass can be modeled with a time constant of 6.0 min. Forced liquid cooling removes heat at a flow rate of 4.3 l/min, helping the motor maintain stable operation under sustained load. The brief overload interval ends as winding temperature approaches its limit, so duty cycle must remain within the permitted operating range.
