Product Description:

The 1MR140F-A045 rotor is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Classified as a rotor for a 1MB frameless spindle motor, it forms the rotating magnetic element that couples with a stator to convert drive current into mechanical power in automated machining and milling centers. The unit follows frame size 140 and motor length code F conventions. It uses an IP00 protection class because it is installed inside a closed spindle cartridge where external barriers and cooling are already present.

At a nominal supply of 182 V, the rotor pairs with its stator to deliver a continuous output of 7.5 kW. When energized, the two pole pairs establish a synchronous magnetic field that supports a rated shaft speed of 3000 rpm and a steady torque of 24 Nm for metal-cutting loads. The winding inductance of 1.83 mH affects the electrical time constant that the drive must regulate, while the maximum permissible phase current of 111.3 A marks the upper thermal limit during rapid acceleration or heavy chip-removal passes. These electrical values must be matched by the spindle drive and the corresponding stator during operation.

A rotor inertia of 0.0082 kg·m² balances fast dynamic response with torsional stability, and a mass of 6.1 kg keeps centrifugal forces within the bearing capacity at full speed. The magnetic lamination stack is enclosed by a forged sleeve that measures 93.4 mm in outside diameter and seats on a shaft diameter of 45 mm, secured through a step interference fit that helps prevent micro-slip during high-frequency reversals. An overall length of 195 mm ensures correct engagement with the matching stator, and an M4 × 0.5 pressure-oil thread facilitates controlled extraction when spindle service is required. This geometry supports secure seating inside the spindle cartridge without adding external housing features.