MSS312H-0025-FR-N0CN-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MSS312H-0025-FR-N0CN-NNNN is a stator for synchronous kit spindle motors and part of the MSS Synchronous IndraDyn H Motors series. This product features a stator-cooling jacket, liquid cooling with a radial connection, and a 1.5 meter power cable with flying leads. It is designed for an ambient temperature from 0 to 40 degrees Celsius and operates with insulation class F.
Internal Product Review
The MSS312H-0025-FR-N0CN-NNNN is a stator for a synchronous kit spindle motor featuring liquid cooling and a stator-cooling jacket. The axial cable connection and radial cooling connection support clean machine integration and practical routing. With insulation class F and a rated speed of 250 min-1, the unit stands out as a well-engineered spindle stator for stable thermal performance.
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Product Description:
The MSS312H-0025-FR-N0CN-NNNN stator is produced by Bosch Rexroth Indramat for the MSS Synchronous IndraDyn H Motors series. As a dedicated spindle motor component, it provides the stationary windings required to generate torque in high-precision machine-tool drives. The separate stator and rotor design allows the motor components to be installed directly inside a spindle housing. This arrangement reduces the overall space required by the motor while supporting integration with a liquid-cooled spindle system.
The winding is tuned for a rated speed of 250 rpm, providing a low base velocity suited to heavy spindle loads and high pole counts. Heat is managed through liquid cooling routed around a stator cooling jacket. Coolant enters the jacket through a threaded G 1/4 port located on the radial plane of the housing, allowing short hose runs within the spindle assembly. Because the stator does not have an enclosure, it has an ingress protection rating of IP00 and must be installed inside a housing that prevents contact with energized parts and blocks foreign objects. Power reaches the winding through a 1.5 m flying-lead cable that exits axially where radial clearance is limited. The stator does not contain a feedback device, so the drive must receive position data from an external sensor installed elsewhere in the spindle system.
The electrical package uses winding code 0025, which provides resistance and inductance values suited to compatible high-current IndraDrive inverters. The stator has a frame size of 312 and a frame length of H, establishing the physical envelope required for installation in the spindle housing. Its Class F insulation supports conductor temperatures up to 155 °C during continuous machining cycles. Permitted ambient temperatures range from 0 to +40 °C, and operation outside this range may reduce winding life or adversely affect coolant viscosity. Proper coolant circulation is required to remove winding heat during sustained low-speed, high-torque operation. The surrounding spindle housing must also provide the mechanical support and sealing that are not included with the unenclosed stator.
