Product Description:

The MST290D-0002-FT-N0SN-NNNN is a permanent-magnet torque motor manufactured by Bosch Rexroth Indramat for the MST Synchronous Torque Motors series. Delivered as a frameless stator-rotor assembly, it bolts directly to rotary tables, winders, and indexing heads that demand consistent torque at crawl speeds. With 30 pole pairs, the motor produces dense magnetic flux at low electrical frequency, allowing the drive controller to couple to the load without mechanical gear reduction. This direct-drive layout improves positioning accuracy, reduces mechanical wear, and simplifies service in automated production cells.

Under continuous duty, the unit develops a rated torque of 350 Nm and turns at a rated speed of 25 rpm. At that operating point, its base output is 0.9 kW. Supplying this operating point requires a phase current of 6.3 A, which matches compact inverter modules. The generated back EMF follows a voltage constant of 4.670 V/rpm, so the drive must furnish proportionally higher voltage as speed rises to maintain current regulation. The winding inductance is 122 mH, the discharge capacity is 15.6 nF, and at 20 °C the motor settles into steady-state behavior within a 3.3-minute thermal time constant.

For transient moves such as indexing or tensioning, the electromagnetic system can generate up to 700 Nm, provided the inverter can momentarily deliver the permitted 25 A peak current. Each ampere contributes torque according to a constant of 55.50 Nm/A, so control loops can calculate load response precisely. Copper losses are governed by a winding resistance of 20.6 Ohm measured at 20 °C, which the drive can use for real-time thermal estimation. The construction carries a protection class of IP00, so the motor must be installed inside a guarded housing where foreign objects or moisture cannot reach the windings.