Product Description:

The MST530D-0012-FH-NNKR-NNNN is a frameless synchronous torque motor built by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Supplied as separate stator and rotor rings, it integrates directly into machine housings so mechanical play is eliminated and stiffness is maximized. This construction is suited to rotary tables, extrusion drives, and print cylinders, where accurate low-speed motion and high holding capability are required in repeatable industrial automation processes. Because the active parts mount directly into the machine structure, the design also reduces backlash and supports rigid axis behavior under reversing loads.

At its continuous operating point, the motor supplies 1680 Nm of rated torque while turning at a 120 rpm rated speed. This is the mechanical output the motor can deliver continuously without exceeding winding temperature limits. Electrical input at that point corresponds to a 21.10 kW rated power, which helps size the inverter. For brief load surges, the unit can reach a 3760 Nm maximum torque so indexing motions or start-ups can be handled without external gearing. The electromagnetic design uses a torque constant of 35.59 Nm/A, so each ampere of phase current produces a proportional amount of torque and supports current-controlled closed-loop tuning.

The phase windings draw 47.2 A of rated current in continuous service and may momentarily accept a 156.4 A maximum current during peak demand, which gives the drive a wider short-term load margin during acceleration and holding events. Dynamic response is influenced by a 11.91 mH winding inductance, while a 1.017 Ω resistance contributes to copper losses during both current changes and steady operation. Heat from those losses is absorbed over a 8.3 min thermal time constant, allowing short overloads without a rapid temperature rise. Other electrical values include 53.8 A standstill current, 1920 Nm standstill torque, 18.4 nF leakage capacitance, a 2.531 V/rpm voltage constant, and a 170 rpm permitted electrical top speed.