Product Description:

The MST450D-0012-FT-N0CN-NNL3 is a frameless synchronous torque motor produced by Bosch Rexroth Indramat in the MST Synchronous Torque Motors series. It provides low-speed, high-torque direct drive for rotary tables, extruders, and similar equipment, eliminating mechanical gearboxes and improving positioning accuracy in automated lines. Because it is a frameless motor, the active parts can be integrated directly into the machine structure, which helps reduce drivetrain backlash and supports compact axis layouts. This type of motor is commonly used on axes that require high stiffness, repeatable positioning, and smooth rotation without compliance from couplings or reducer stages.

Its mechanical output is rated at 810 Nm at a rated speed of 190 rpm, producing continuous shaft power of 16.10 kW. To reach that operating point, the stator draws a rated current of 31.0 A, and the electromagnetic design yields a torque constant of 26.29 Nm/A, so torque rises in proportion to current. A voltage constant of 1.455 V/rpm reflects back-EMF generation as speed increases, while the standstill current of 36.7 A indicates the current demand when the rotor is locked. Winding resistance of 1.4 Ω contributes to copper losses and influences heating during sustained load, and these electrical values help the matching drive regulate torque during indexing and constant-speed operation.

Thermal management relies on liquid cooling circulated through an open cooling jacket that holds 0.48 L of coolant. The circuit must provide a flow rate of 5.7 l/min to remove 4.00 kW of internal power loss and keep the winding temperature within operating limits. During aggressive acceleration, the inverter may supply up to 100.0 A, and the 6.0 mm² power leads are sized for that load. The winding inductance of 11.2 mH helps limit current ripple when the drive switches at high carrier frequencies, and open-jacket cooling moves heat away from the stator without requiring external air movement around the motor core.