Product Description:

The 1MS310B-6B-A1 is a stator module built by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated stator for a frameless spindle motor, it provides the stationary magnetic field that interacts with a separately supplied rotor to generate torque in high-speed machine-tool spindles and other precision automation axes. The supply conductors are factory-installed in a 1.5 m loom passed through one stator end, simplifying cabinet wiring while keeping motor leads short for low impedance.

Bosch Rexroth Indramat supplies this part within the 1MB High-Speed Asynchronous Motors series, so its electrical and mechanical interfaces match the other components in that family. A sealed network of channels enables liquid cooling, which removes heat directly at the copper and permits higher continuous current density than air-cooled stators. Thermal transfer is helped by the integrated aluminum cooling jacket; aluminum’s high conductivity spreads localized hot spots and protects winding insulation. The stator belongs to frame size 310, identifying an outer lamination diameter of roughly 310 mm that sets the clearance for the mating motor housing and determines the achievable magnetic surface area.

Motor length code B designates the intermediate axial stack height in the 1MB range, providing a balance between torque output and envelope depth for medium-power spindles. Inside the slot pack, the winding variant is coded as 6B, meaning the coil pitch, wire gauge, and turns count are optimized for the high switching frequencies used by modern inverters. Because it is a stator for a 1MB frameless spindle motor, the unit ships without a bearing system or shaft; it is intended to be pressed into a customer-supplied housing where the liquid-cooling circuit and rotor assembly complete the motor.