MST290B-0018-FT-N0SN-NNNN
MST Synchronous Torque Motors
The MST290B-0018-FT-N0SN-NNNN is a frameless synchronous torque motor segment produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a direct-drive rotary element, it delivers high continuous torque at low speed so machine builders can eliminate mechanical gear stages in indexing tables, printing cylinders, or extruders. By integrating the stator and rotor directly into the host structure, the unit reduces backlash and supports position control tasks that demand smooth motion in industrial automation.
Under nominal operating conditions this motor develops a continuous torque of 220.0 Nm while turning at a rated speed of 180 rpm; both values correspond to a shaft output of 4.10 kW. A phase current of 14.8 A is required to achieve those figures, and the copper windings present a resistance of 6.6 Ω at 20 °C that determines resistive losses. Inductive behavior is defined by a coil reactance of 34.8 mH, which influences current rise time during control commands. When the rotor is locked, the windings can accept 16.5 A and produce 245 Nm, allowing static load holding without external brakes. The stator terminals accept power conductors up to 1.5 mm², and the leakage capacitance of 8.4 nF must be considered when sizing RFI suppression components.
Dynamic headroom is shown by a peak torque capability of 460 Nm, a permissible electrical speed of 340 rpm, and a maximum current draw of 60.0 A for short acceleration bursts. Thirty magnetic pole pairs create a large electrical angle per mechanical revolution, enabling high torque density even at low velocities; the pole count is therefore highlighted as 30. The torque constant of 14.90 Nm/A indicates that every ampere injected into the windings yields nearly fifteen newton-meters, a ratio useful for tuning current-controlled servo amplifiers.
Technical Specifications
Cooling Jacket Length
105 mm
Cooling Type
Water Cooling
Encapsulation
Open Aluminum Cooling Jacket
International Protection Code
IP00
Leakage Capacitance
8.4 nF
Max Electrical Speed
340 rpm
Maximum Current
60 A
Maximum Torque
460 Nm
Number Of Pole Pairs
30
Outside Cooling Jacket Diameter
310 mm
Power Wire Cross-section
1.5 mm²
Rated Current
14.8 A
Rated Power
4.1 kW
Rated Speed
180 rpm
Rated Torque
220 Nm
Standstill Current
16.5 A
Standstill Torque
245 Nm
Torque Constant (20 °c)
14.90 Nm/A
Weight
17 kg
Winding Inductance
34.8 mH
Winding Resistance (20 °c)
6.6 Ω
Common Misspellings
Fax: 1-919-867-6204
Shipping & Payment Options
Warranty
Indramat USA 1 Year Warranty
Repair
We offer a repair service for the MST290B-0018-FT-N0SN-NNNN. 
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