Product Description:

The MST530F-0012-FH-NNKR-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. It is a frameless direct-drive unit that mounts directly to the load to supply controlled angular motion for rotary tables, extruder screws, and indexing heads in automated equipment. Because it is frameless, the rotor and stator are integrated into the machine structure instead of a separate motor housing. The direct liquid-cooled construction keeps the active parts compact while still supporting the large magnetic surfaces needed for high torque production.

Under continuous duty, the motor delivers a rated torque of 2520 Nm at a rated speed of 120 rpm, which equals 31.70 kW of mechanical power, and this output requires a stator current of 71.3 A. A torque constant of 35.30 Nm/A links phase current to shaft torque and allows predictable closed-loop control. The electrical circuit presents a winding inductance of 6.45 mH and a winding resistance of 0.546 Ω at 20 °C, so the drive must manage current rise while limiting I²R losses. Back electromotive force rises with speed through a voltage constant of 2.430 V per min⁻¹, and stable operation is permitted up to an electrical maximum of 175 rpm. These electrical values must be matched with a compatible drive so current response remains stable across the operating range.

Dynamic overload capability is significant: peak motion events can command up to 5640 Nm, while the inherent standstill torque available for holding position is 2880 Nm. These limits are attainable because the windings accept a short-term current of 253.0 A, and the lamination stack can dissipate 8.10 kW of heat. Thermal stability relies on liquid cooling; the stator contains a 1.80 L channel that must be supplied with 11.5 L/min of coolant. The leakage capacitance to the machine frame is 27.6 nF, which is relevant to grounding and filtering behavior in the drive system. Stable coolant flow helps control winding temperature during extended operation and during repeated high-torque events.