Product Description:

The 1MR160D-A061 is a rotor component built by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Classified as a rotor for a 1MB frameless spindle motor, it is installed inside a machine tool or woodworking spindle where the stator is mounted separately. By combining a two-pole design with liquid cooling passages, the rotor supports the high peripheral velocity needed for precision metal cutting and grinding.

The rotor is designed for a rated speed of 2000 rpm, giving the spindle a predictable cutting surface velocity under continuous operation. At that speed, it produces a rated torque of 32 Nm, translating electromagnetic force from the stator into usable spindle power. Heat generated during load is removed by a coolant flow of 2.6 l/min that passes through an internal duct with a volume of 0.3 l; the circuit must not exceed an inlet pressure of 3 bar and shows only 0.1 bar of pressure drop at nominal flow. With a rated power loss of 1.8 kW, the rotor relies on that coolant to limit the average temperature rise to 10 K. The protection rating is IP00, so every installation must place the rotor inside a sealed spindle housing filled with oil or water-glycol to avoid contamination.

Mechanically, the component belongs to frame size 160 and follows motor length code D, giving designers a standard envelope for pairing with 1MB stators. The active laminate stack is bored to an inside diameter of 60.3 mm, allowing a shaft to be mounted with a step interference fit. Total rotor mass is 7.3 kg, and its mass distribution results in a polar moment of inertia of 0.012 kg·m²; these values affect acceleration behavior and drive tuning when the spindle ramps between setpoints. The low thermal rise helps maintain dimensional stability during prolonged duty cycles, which supports spindle accuracy during long machining runs.