Product Description:

The 1MB200D-4E-A066A1 is a frameless spindle motor produced by Bosch Rexroth Indramat within the 1MB High-Speed Asynchronous Motors series. Designed for machine tool spindles and other high-speed axes, the unit integrates directly into the host shaft to deliver mechanical output without an external housing. Its asynchronous design allows slip for smooth acceleration, while the integrated aluminum cooling jacket supports liquid circulation around the stator. This layout helps the motor fit compact spindle assemblies where a separate motor housing would add size and mass.

The motor delivers a continuous mechanical output of 31.4 kW, meaning it can maintain this power level when adequate thermal management is provided by the stator jacket. Corresponding torque at the shaft is 70.9 Nm, so cutting forces in milling or grinding applications can remain steady during extended duty cycles. At a rated operating speed of 4230 rpm, the electromagnetic and thermal design supports regular production use. For rapid tool changes, the rotor can accelerate up to a maximum of 18000 rpm, so the system bearings and drive electronics must tolerate the associated centrifugal loads. Heat generated at higher speeds is removed by an integrated liquid cooling circuit, which keeps winding temperature below insulation limits and helps prevent derating.

The motor uses frame size 200 and motor length code D, giving a compact axial package that still accommodates the 4E winding variant. The bare rotor weighs 18.3 kg and carries an IP00 rating, so the assembly relies on the machine enclosure for protection against contact and contamination. With a rotational inertia of 0.052 kg·m², speed commands from the drive are carried out quickly while still providing damping against minor load disturbances. Continuous duty is supported by a short-time utilization factor of 44 %, which allows brief overloads before thermal equilibrium is restored. Under peak power conditions, the rotor speed is limited to 10834 rpm so mechanical stress stays within the permitted range for this stator construction.