Product Description:

The 1MB200D-4E-A060A1 is a frameless spindle motor developed by Bosch Rexroth Indramat within the 1MB High-Speed Asynchronous Motors series. Designed for machine tools and production centers, the unit integrates directly into a spindle assembly, delivering continuous rotary motion for cutting, grinding, or drilling tasks. A liquid-cooled aluminum stator jacket extracts process heat, while the separate rotor with a 60 mm bore couples to the machine shaft. By combining high power density with a compact frame size 200 envelope, the motor supports demanding duty cycles in automated manufacturing lines.

At its electrical rating, the motor provides 13.5 kW of mechanical output when the windings are energized with a rated current of 84 A at 138 V. This power is achieved at a shaft speed of 1500 rpm, giving a continuous shaft torque of 85 Nm. The electromagnetic design produces this torque with a sensitivity of 1.06 Nm/A, so incremental current changes translate linearly into speed or torque adjustments inside a servo loop. Control bandwidth is further influenced by the low leakage reactance associated with the 0.743 mH phase inductance, which allows current to rise quickly after every command step and minimizes delay between drive output and mechanical response.

During temporary load spikes, the stator can accept up to 201.9 A, offering ample overload room before thermal limits are reached. Stable operation is sustained by circulating coolant at 3.9 L/min through the jacket, keeping copper temperature within insulation class limits even on long production shifts. The rotor inertia is 0.037 kg·m², balancing acceleration capability against torsional stability for surface-finish-critical machining. Electrical losses remain moderate because the copper network presents only 0.103 Ω of phase resistance, reducing I²R heating and supporting the motor’s continuous duty rating without derating.