Product Description:

Bosch Rexroth Indramat manufactures the MST290B-0018-FT-N0BN-NNNN, a torque motor that belongs to the MST Synchronous Torque Motors series. As a frameless direct-drive unit, it mounts directly to the machine axis and supplies high continuous torque at low rotational speed, a characteristic favored in rotary positioning tables, printing cylinders, and similar automation tasks. Its frameless layout also reduces the need for separate couplings inside the drive train, which helps limit compliance in precision rotary axes.

The motor’s continuous operating point uses a rated current of 14.8 A, and at that current the electromagnetic system delivers a rated torque of 220 Nm. At that torque, the shaft reaches a rated speed of 180 rpm and produces a mechanical output of 4.10 kW. The copper windings generate torque in proportion to phase current, and that proportionality is shown by the torque constant of 14.90 Nm/A. This operating range suits low-speed, high-force duty where inertia must be overcome without gearing. Liquid cooling circulates through an internal jacket, and thermal encapsulation stabilizes temperature gradients so the motor can hold its continuous ratings during extended cycles.

During transient events, the drive can reach a maximum torque of 460 Nm while drawing up to 60.0 A, which provides headroom for rapid indexing or breakthrough cuts. Electrical dynamics are moderated by a winding inductance of 34.8 mH and a phase resistance of 6.6 ohms, and these values influence current rise time and copper loss during inverter operation. Thirty pole pairs support fine angular resolution in external feedback systems even though no encoder is factory mounted. The liquid loop must provide 5.0 l/min of flow at a maximum inlet pressure of 6.0 bar to remove loss heat and preserve insulation integrity throughout repetitive start-stop duty.