Product Description:

The MRS312D-2N-0160-NNNN is a rotor manufactured by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As the rotating core of an IndraDyn H synchronous spindle motor, it works with the laminated stator to convert electromagnetic force into torque for the connected mechanical load. This arrangement supports the precise rotation required by machine-tool spindles, machining centers, and other CNC equipment. The rotor is intended for applications that require stable motion at high operating speeds and under changing mechanical loads.

With a frame size code of 312, the rotor occupies the largest housing diameter in the series, providing ample surface area for magnetic flux. Its frame length code of D indicates an extended active stack that increases torque capacity without changing the outside diameter. The rotor has an internal diameter of 160 mm, which accommodates the spindle shaft and supports the required mechanical connection. Its overall axial length is 419 mm, allowing the available installation space and surrounding motor components to be arranged accurately. The rotor bore and mounting interface use a step interference fit that creates a secure press-fit connection. This connection helps prevent relative movement between the rotor and shaft during rapid acceleration, deceleration, and sustained high-speed operation.

The permitted ambient temperature range is 0 to 40 °C; operation outside this range may require reduced loading or additional cooling. The open construction has a protection rating of IP00, leaving the internal motor parts without protection against contact, solid objects, or water. As a result, the assembled motor must be installed within a suitable machine enclosure that provides the necessary physical protection and supports effective airflow. The matched motor insulation system uses Class F insulation, which permits a maximum insulation temperature of 155 °C under applicable operating conditions. The standard design is supplied without special balancing, integrated coolant passages, or factory-installed sensor options. Application-specific cooling, monitoring, and balancing provisions can be incorporated into the surrounding spindle assembly when required by the machine design.