Product Description:

The MST290B-0018-FH-N0PU-NNNN torque motor is manufactured by Bosch Rexroth Indramat for the MST Synchronous Torque Motors series. This direct-drive unit is optimized for rotary axes that demand high stall torque at minimal speed, such as extrusion screws, rotary tables, or large indexing heads in automated production. By coupling the rotor directly to the load, the motor eliminates mechanical gear stages, reduces backlash, and improves position repeatability. Its construction emphasizes sustained torque output rather than rapid acceleration, making it suitable for machine sections that operate continuously under heavy process loads.

Heat removal is handled by liquid cooling, using an aluminum cooling jacket molded into the housing so circulating coolant keeps the windings within safe limits. In continuous operation, the motor delivers 220 Nm at 180 rpm, yielding 4.10 kW of mechanical power while requiring only 14.8 A from the inverter. Because the motor does not include an internal encoder, external feedback must be supplied when closed-loop positioning is required. Mains conductors terminate on a connector socket identified as RLS1200, and the recommended supply cables use 1.5 mm² conductors to help limit temperature rise and voltage drop over the lead length.

Within the frame envelope of 290, the windings tolerate intermittent loads up to 460 Nm, supported by a peak phase demand of 60 A rms. Under these overload conditions, the stator releases 3.00 kW of losses that the cooling circuit must absorb to prevent thermal shutdown. The fixed flange geometry simplifies installation against large bearing cartridges and keeps the power connector clear of rotating members. This layout helps the motor fit cleanly into compact machine arrangements without additional structural adapters and supports stable integration where heavy rotary loads must be driven directly.