Product Description:

The 1MS160N-4B-A1/S010 is a stator assembly produced by Bosch Rexroth Indramat for use in the 1MB High-Speed Asynchronous Motors series. As a frameless component, it is mounted directly into a spindle housing to create a compact motor that drives high-speed machining centers and other automation axes. By separating rotor and stator, the design reduces shaft mass and permits rapid acceleration, while liquid circulation through an external jacket maintains thermal stability during continuous industrial duty.

This stator uses liquid cooling, so heat is removed through a closed fluid circuit rather than ambient air, supporting high power density in enclosed spindles. The frame is classified as size 160, which sets the outside diameter and matches mechanical interfaces found in mid-range machine tools. A winding variant of 4B sets the conductor cross-section and number of turns to balance current demand with available inverter voltage. The motor length code N indicates an axial package that delivers the rated torque without exceeding installation depth. Power and thermal sensor leads exit through a 1.5 m loom routed out of one stator end, allowing straightforward connection inside the spindle housing.

For drive selection, the unit is suitable for use with third-party drives, enabling pairing with non-Rexroth inverters while preserving electromagnetic performance. The active laminations are encased with an aluminum cooling jacket, providing a corrosion-resistant path for coolant and helping maintain uniform temperature around the winding. Internal protection is enhanced by NTC resistors, PTC resistors, and bimetals that feed temperature data or open safety circuits when preset limits are reached. As a stator for a 1MB frameless spindle motor, it is combined with a rotor, bearing set, and position feedback to match application speed, torque, and installation space.