Product Description:

Bosch Rexroth Indramat manufactures the MST450E-0006-FT-N2RN-NNNN torque motor as part of the MST Synchronous Torque Motors series. This frameless stator-rotor set is intended for direct-drive rotary axes where gearboxes would introduce backlash and wear. Its frameless design lets the machine builder integrate the motor directly into the rotary structure instead of using a housed motor with transmission components. By supplying high stall torque at very low shaft speed, the unit supports precise positioning and smooth continuous rotation in extrusion screws, rotary tables, and printing cylinders used throughout industrial automation.

For continuous operation, the motor delivers a rated torque of 1400.0 Nm at a rated speed of 90 rpm, corresponding to a shaft output of 12.70 kW. These figures are based on a rated current of 27.8 A passing through windings with a resistance of 2.6 Ω at 20 °C. This operating point suits heavy rotary axes that need steady torque at low speed rather than high-speed spindle duty. When rapid acceleration or disturbance rejection is required, the drive can reach a maximum current of 85.0 A, enabling a peak torque of 3250 Nm. A torque constant of 48.34 Nm/A relates instantaneous phase current to produced torque, simplifying current-mode control. The electrical top speed is limited to 350 rpm, which helps prevent magnetic saturation in the thermally encapsulated winding pack.

Water cooling circulates through channels in the stator laminations, and the resin-based encapsulation spreads losses evenly toward the coolant. With a stator mass of 84.0 kg, the assembly stores heat without sudden temperature swings, allowing the system time to react before protection trips. The induced back electromotive force corresponds to a voltage constant of 2.759 V/rpm, while energy storage in the magnetic circuit appears as a winding inductance of 21.9 mH. Power conductors sized at 6.0 mm² exit radially on the larger outside-diameter side, easing cable strain relief and maintaining a compact interface. This radial cable exit also helps when the motor is installed in machine layouts with limited axial space around the rotating assembly.