Product Description:

The 1MS375B-6B-A2/S011 is a stator assembly manufactured for the 1MB High-Speed Asynchronous Motors series. Serving as the fixed magnetic core in a frameless spindle motor, it produces the rotating field that drives the paired rotor when the inverter applies three-phase power. This arrangement is widely used in automated machining centers where high spindle speeds and compact installation space are required. Supplying the magnetic circuit separately from the rotor also allows custom housings to be built around the motor while preserving stable torque delivery and controlled thermal behavior.

Mechanical sizing begins with the 375 frame size, whose outside diameter suits large cartridge-style spindles and leaves a generous bore for through-shaft coolant passages or tool drawbars. The 6B winding sets the electromagnetic behavior of the assembly and supports compatibility with standard IndraDrive inverter voltages. Heat produced during high-speed operation is removed by liquid cooling, which helps keep copper temperatures within insulation limits during sustained use. That heat passes directly into an aluminum cooling jacket, whose high thermal conductivity helps limit radial growth and maintain consistent air-gap clearance.

Power and feedback conductors are supplied as a 1.5 m loom that is factory terminated and shielded to reduce electrical noise. The harness is routed through the stator end, which allows axial rotor insertion without cable interference and simplifies assembly inside the spindle housing. The B length code gives the unit a mid-range axial stack, balancing torque capacity with inertia for responsive spindle acceleration. Delivered as a stator for 1MB frameless spindle motor and supplied without bearings, the module is intended for direct integration into precision housings built around the motor assembly.