MSS200B-050-A1N-NN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS200B-050-A1N-NN is a stator for synchronous kit spindle motors from the MSS Synchronous IndraDyn H Motors series. It is liquid cooled and features an insulation class F with a stator mass of 17 kg. The stator delivers a standstill torque of 90 Nm, a standstill current of 128 A, and allows a usable peak current of 245 A.
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Product Description:
The MSS200B-050-A1N-NN belongs to the MSS Synchronous IndraDyn H Motors series produced by Bosch Rexroth Indramat. This model is supplied as a stator for a synchronous kit spindle motor, allowing direct integration of the liquid-cooled electromagnetic section into a custom housing. In spindle applications, it generates torque for metal-cutting or grinding heads while maintaining a compact diameter for installation in confined machine frames. The separate-stator format also allows the surrounding spindle housing to provide the required support, protection, and coolant passages.
The stator delivers continuous torque of 90 Nm at standstill while drawing a standstill current of 128 A. Its torque constant is 0.73 Nm/A, and the induced back electromotive force follows a voltage constant of 66.4 V/1000 rpm. The compact winding package has an inductance of 0.46 mH, supporting a rapid current rise for responsive spindle operation. A 22 mm cable exits the jacket and has a length of 1.5 m, while its minimum bend radius is 90 mm to protect the internal conductors. The aluminum jacket transfers winding heat to the surrounding coolant circuit. Class F insulation tolerates winding temperatures up to 155 °C, and the permitted ambient temperature range extends from 0 to 40 °C. Frame length code B keeps the stator mass at 17.0 kg, reducing the weight added to the spindle assembly when the stator is paired with the matching rotor.
For short-duty peaks, the windings accept up to 245 A, providing additional current for demanding acceleration periods. The winding resistance is 0.06 Ω, which helps limit electrical losses during operation. When installed with a shrink fit, the assembly can reach a maximum mechanical speed of 6300 rpm, whereas axial clamping limits the speed to 2500 rpm because of flange stress. The stator has an IP00 protection rating, so it must be installed inside a sealed spindle housing that prevents contact with live or moving components. Coolant must circulate around the outer jacket to remove generated heat. No feedback device is integrated into the stator, allowing the spindle design to use a separately selected position or speed sensor when closed-loop control is required.
