Product Description:

The 1MR310F-S125 is a rotor component produced by Bosch Rexroth Indramat as part of the 1MB High-Speed Asynchronous Motors series. It fits inside a matching stator to form the rotating core of a compact motor-driven spindle, a configuration favored where envelope size and rapid speed changes are critical. Designed for integration into machining centers and automated production cells, this rotor converts electromagnetic induction from the surrounding stator into mechanical torque that drives high-speed cutting or grinding tools.

Its frame size of 310 sets the outer diameter envelope, aligning the rotor with compatible stator laminations. The core provides an inside diameter of 125 mm, leaving room for through-shaft clamping or coolant piping. A design using 3 pole pairs balances synchronous speed against torque generation and supports the high-frequency drives typical of metal-cutting spindles. The assembled steel stack, end rings, and bars yield a rotor mass of 95 kg, supplying the rotational momentum needed for smooth machining at elevated speeds. The moment of inertia is 0.723 kg·m², which affects the acceleration profile that the drive controller must overcome during rapid speed changes.

The axial envelope uses motor length code F, indicating a medium-length rotor that balances stiffness against overall spindle size. Because the unit has a protection class of IP00, it must operate inside an enclosed stator housing where circulating oil or air removes heat and shields the laminated stack from contamination. It is supplied as a rotor for a 1MB frameless spindle motor and comes without bearings, allowing machine builders to mount precision support assemblies that match the application. Compatibility with standard stator windings, cooling jackets, and encoder systems simplifies integration into high-speed machining spindles.