Product Description:

The MST130A-0250-NS-N0CN-D303 is a frameless synchronous torque motor produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Applied as a direct-drive element, it generates mechanical torque directly on the load shaft, which simplifies transmission layouts in indexing tables, rotary knife stations, and winding heads where compact construction and precise speed control are required. Its frameless construction allows the active motor parts to be integrated into the machine axis, reducing the need for separate couplings and other drive components. With no gearbox or belt stage required by the motor itself, the axis can respond more directly to speed and position commands.

During continuous operation the rotor can run at 2500 rpm, delivering a shaft output of 1.20 kW while producing a steady torque of 4.5 Nm. That operating point draws 3.5 A of phase current and is supported by ten pole pairs that establish the electromagnetic field geometry. The torque-to-current relationship uses a constant of 1.30 Nm/A, so commanded current can be translated into predictable drive torque in the control loop. Copper and core losses at the rated point add up to 0.11 kW of heat that must be removed through the mounting plate, and a voltage constant of 0.085 V/rpm provides the back-EMF reference used by the drive for commutation and protection. This arrangement supports smooth commutation across the speed range and helps the motor maintain stable torque production under controlled load changes.

Short-term overloads are handled by a ceiling torque of 13 Nm and a corresponding phase limit of 12.0 A. When the rotor is locked, it withstands a holding load of 5 Nm with a standstill winding current of 3.9 A, which supports static clamping or creep-feed processes. The difference between continuous and peak current values allows brief load surges without forcing the motor to remain at its thermal limit during normal duty. Thermal saturation is moderated by a winding time constant of 15.0 min, allowing intermittent peaks without immediate overheating and giving the drive time to track temperature feedback.