Product Description:

The MST450D-0012-FH-N0KR-NNNN is a frameless torque motor produced by Bosch Rexroth Indramat as part of the MST Synchronous Torque Motors series. As a direct-drive component, it mounts inside machine tables or rotary axes. It delivers high stall torque without gears or belts for positioning tasks in industrial automation, and its frameless design supports integration directly into the driven mechanism.

This model develops a rated torque of 810 Nm while turning at a rated speed of 120 rpm, giving a continuous mechanical output of 10.2 kW. To support this output, the electromagnetic loading draws 33 A from the drive and is carried through power leads sized at 6.0 mm². Heat generated by copper and iron losses is removed by a liquid cooling circuit that flows through an integrated cooling jacket, so the winding temperature stays within operating limits during long production runs. Electrical termination is made in a terminal box positioned on the right side of the stator, and an M8 PE thread provides the protective earth connection. The motor is wound without an encoder, leaving feedback selection to the machine builder so the axis can be matched to the required feedback format. A voltage constant of 1.480 V·min⁻¹ relates back EMF to speed, and a rated winding resistance of 1.35 Ω at 20 °C sets copper loss at nominal current.

For short periods, the motor can generate a maximum torque of 1800 Nm, supplied by a peak phase current of 100 A. The torque constant is 24.50 Nm/A, so additional current produces a proportional rise in shaft torque and supports fast indexing. A maximum mechanical speed of 250 rpm sets the upper operating range, and liquid cooling helps maintain thermal stability while the encapsulated stator resists vibration. The low-resistance copper path and the terminal arrangement help limit voltage drop between the inverter and the winding.