Product Description:

The 1MS160N-4C-A2/S011 stator is manufactured by Bosch Rexroth Indramat as part of the 1MB High-Speed Asynchronous Motors series. It is supplied without a shaft or bearings, because in frameless construction the surrounding spindle housing supplies mechanical support. Within an industrial automation cell, the unit supplies the rotating magnetic field that drives a matching rotor, enabling high-speed milling, grinding, or drilling heads while keeping overall rotor inertia low. This layout lets the machine builder integrate the active motor parts directly into the spindle assembly, which helps conserve space in compact machining equipment.

The lamination stack corresponds to Frame Size 160, establishing the outer diameter and mounting pitch used in the 1MB platform. Coils are wound in the pattern identified as Winding Variant 4C, setting resistance and inductance so the motor can draw high-frequency inverter currents without saturation. Thermal energy is removed by liquid cooling, which moves coolant directly against the winding heads. The coolant circulates through an integrated jacket machined as an aluminum cooling jacket, giving high thermal conductivity with low weight. All power and sensor conductors are pre-terminated in a 1.5 m loom, which helps simplify routing from the spindle area to the associated drive and monitoring connections.

The cable bundle exits through the stator end, so axial clearances for chuck or tooling drawbars remain unobstructed. Integrated fins on the aluminum cooling jacket form sealed coolant channels, allowing connection to external chillers without extra manifolds. Axial depth corresponds to Motor Length Code N, which provides a mid-range stack length for balancing torque density and spindle overhang. Because the assembly is a stator for a 1MB frameless spindle motor, it can be bonded into a custom sleeve while the machine structure provides the surrounding enclosure. This arrangement supports spindle designs that need a compact motor package with direct thermal transfer into the housing.