Product Description:

The MRS202F-2N-0085-NNNN rotor is supplied by Bosch Rexroth Indramat as a component for a synchronous IndraDyn H spindle motor. This item forms the rotating core of a spindle assembly used in CNC machining centers that require precise angular motion and controlled acceleration. When paired with the stator, the rotor’s permanent-magnet field interacts with the applied current to generate torque. The resulting electromagnetic force converts electrical excitation into controlled spindle rotation while transferring mechanical power to the connected spindle shaft.

The geometric envelope begins with a frame size of 202, providing a large magnetic cross-section for high power density. Within this envelope, the frame length code F indicates the axial stack depth selected for medium-inertia spindle applications. The rotor core is machined to an internal diameter of 85 mm, allowing space for clamping drawbars or cooling lines without interfering with the rotating assembly. The overall rotor length is 387 mm, providing the surface area needed for secure coupling to the tool-holding sleeve. The rotor has an ingress protection rating of IP00, so it must operate inside a fully enclosed motor housing that provides protection from contact, dust, and moisture.

Mechanical integration relies on a step interference fit between the bored hub and the spindle shaft, producing concentric alignment and preventing axial movement during rapid acceleration cycles. Operation is permitted at ambient temperatures from 0–40 °C, allowing thermal growth to remain within the range expected for precision machining cells. The windings paired with this rotor use class F insulation, which permits winding temperatures up to 155 °C during intermittent duty. The Standard design uses the baseline magnet grade and balancing quality for this rotor type. It belongs to the IndraDyn H family and is intended for integration into a compatible enclosed spindle motor assembly.