Product Description:

Bosch Rexroth Indramat's 1MS160D-4A-A1 is a stator component within the 1MB High-Speed Asynchronous Motors series. Serving as the active magnetic core of a spindle assembly, the unit provides the electromagnetic field required for high-speed machining platforms and other precision automation stations. Because the stator is frameless, it is intended to be integrated directly into the machine spindle housing rather than installed as a complete standalone motor. When paired with a matching rotor, it forms a direct-drive spindle motor capable of transmitting torque directly to the tool shaft without intermediary couplings, an arrangement that reduces inertia and improves dynamic response on CNC and transfer lines.

The stator ships with a 1.5 m loom that routes power leads through the stator end, simplifying enclosure wiring and minimizing bend radius at the exit point. Heat rejection is handled by liquid cooling, so coolant circulates around the laminated core instead of relying on airflow. This arrangement helps remove heat from the windings more evenly during sustained high-speed operation. The unit uses frame size 160, providing an outside diameter that mates with standard cartridge housings. An integral aluminum cooling jacket surrounds the winding stack to transfer thermal energy directly into the coolant circuit.

For installations with limited space, the motor length code D balances axial size with adequate magnetic depth, allowing useful torque density without exceeding housing depth constraints. Electrical characteristics are tuned through the winding variant 4A, giving resistance and inductance values matched to high-frequency inverters, so the drive can maintain the intended magnetic behavior across the operating range. The molded grommet on the connection cable helps maintain sealing along the liquid path and prevents vibration chafing. The unit is a stator for a 1MB frameless spindle motor, which places the stationary windings and core directly in the machine housing.