Product Description:

The 1MS160B-4A-A1 stator is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary magnetic element of a frameless spindle motor, it creates the electromagnetic field that the rotor cuts to generate torque during acceleration and steady operation. It is used inside machine-tool spindles and other high-speed assemblies where compact dimensions and closed-loop cooling help maintain stable thermal conditions during continuous industrial use. The frameless format allows the stator to be integrated directly into the surrounding spindle structure instead of being mounted in a separate motor housing.

This stator has a frame size of 160, which suits housing bores commonly used in heavy-duty spindle assemblies. Its axial depth follows motor length code B, giving a mid-length construction that balances power density and winding resistance. Heat is removed by liquid cooling, so coolant circulates around the laminated core instead of relying on ambient airflow. This cooling method allows higher continuous current without exceeding insulation limits. The aluminum cooling jacket improves heat transfer to the coolant channel and adds stiffness around the core, while a 1.5 m loom routes electrical power out of the stator end with enough reach for cabinet termination and clear separation from rotating parts.

The electromagnetic layout uses winding variant 4A, which sets the slot fill factor and phase resistance for high-frequency inverter operation. Because it is a stator for a 1MB frameless spindle motor, it is paired with a compatible rotor to form a compact drive without an external housing. The winding is built for repeatable impedance, which supports consistent electrical behavior and predictable thermal response during operation. This arrangement is suited to enclosed spindle assemblies that must maintain stable performance at high speed.