Product Description:

The 1MS160D-4B-A2 is a stator assembly supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series of frameless spindle drives. As a stand-alone stator, it is paired with a compatible rotor to create a high-speed motor for machine-tool spindles and other precision automation duties. In operation, the stator generates the electromagnetic field that produces torque, while the frameless format allows the finished motor to fit directly into the spindle housing. This arrangement supports compact spindle construction without requiring a separate motor enclosure or external adapter components.

Thermal management is handled by liquid cooling, which carries heat away from the winding area before temperature rises too far within the lamination stack. The unit has a frame size of 160, matching spindle housings in the same metric class. Length code D indicates the axial stack height and helps establish the installed motor length. Heat transfer is further improved by an aluminum cooling jacket, which moves thermal energy from the stator body to the coolant path with low thermal resistance. This cooling arrangement supports stable operation during continuous high-speed use.

Electrical connection is provided through a 1.5 m loom, and the leads exit through the stator end to keep the outer housing surface clear for coolant connections and mounting features. The magnetic circuit uses winding variant 4B, which matches the electrical characteristics expected by compatible high-frequency inverters in this motor platform. Because the stator is supplied as a separate assembly, it can be integrated into a spindle build where the rotor, shaft, and bearing system are selected for the required speed range. This layout helps the motor assembly fit tightly within the machine structure while keeping electrical and cooling connections accessible.