MSS312H-0085-FR-N0CN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS312H-0085-FR-N0CN-NNNN is a stator for synchronous kit spindle motors from the MSS Synchronous IndraDyn H Motors series. It features a standard design with a stator-cooling jacket and uses liquid cooling through a radial G 1/4 connection. The stator has a motor frame size of 312 and insulation class F, and is rated for a speed of 850 min-1.
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Product Description:
The MSS312H-0085-FR-N0CN-NNNN stator is manufactured by Bosch Rexroth Indramat for the MSS Synchronous IndraDyn H Motors series. This component represents the stationary half of a frameless synchronous kit spindle motor and is intended for integration into custom housings used in milling heads, grinding spindles, and comparable automation axes. By supplying the electromagnetic field while a separate rotor carries the magnets, the stator converts drive-controller current into torque without adding extra bearings or end bells, supporting compact, high-precision machinery.
The unit is delivered with a 1.5 m power cable that terminates in flying leads, allowing direct connection to the inverter where space for plugs is limited. Thermal regulation is handled by a stator cooling jacket; coolant circulates through this sleeve to extract heat from the copper windings. The circuit uses a G 1/4 threaded port on the radial side, matching standard machine-tool fittings and keeping hose runs short. Internal passages support liquid cooling, enabling continuous operation at full current without derating. Winding variant 0085 pairs with the magnetic core to achieve a rated speed of 850 rpm, favoring high torque at a low electrical frequency for heavy cutting or low-speed indexing tasks.
Because the machine builder supplies the external enclosure, the stator itself carries an ingress protection rating of IP00, so it must be mounted where conductive debris cannot reach the laminations. The windings use Class F insulation, which tolerates hot-spot temperatures up to 155 °C when the coolant loop functions correctly. The stator has a frame size of 312 and a length code of H, providing a large magnetic stack for high continuous torque while fitting common spindle bores. Operation is permitted at ambient temperatures from 0 to +40 °C; additional temperature control is required outside this range. Axial cable routing and radial coolant connections simplify installation in both vertical and horizontal spindle orientations.
