Product Description:

The 1MS140B-4B-A1/S010 is a stator subassembly produced by Bosch Rexroth Indramat and assigned to the 1MB High-Speed Asynchronous Motors series. As the fixed magnetic element of a frameless spindle motor, it pairs with a matching rotor to generate the rotating field needed for direct-drive spindles used in metal-cutting, grinding, and similar automation tasks. By supplying only the electromagnetic core, the design allows machine builders to integrate the motor directly into a spindle housing and make efficient use of available space.

Thermal management relies on liquid cooling, so water removes heat from the copper and supports high-speed operation. The stator body uses a lamination stack for frame size 140, giving an outer diameter that suits many machine-tool spindle layouts. Power and sensor lines exit through a 1.5 m loom routed through the stator end, and the pre-terminated cable helps shorten installation time while keeping the winding heads sealed. Electromagnetic behavior is set by winding variant 4B, which establishes the turns count and resistance for the high-frequency drive signals used in grinding spindles. The unit is suitable for third-party drives, so it can be paired with non-Bosch Rexroth inverters when current and voltage limits are observed. Mechanical integration is also aided by an aluminum cooling jacket, which adds rigidity and provides an internal coolant channel.

Protective monitoring is handled by integrated NTC resistors, PTC resistors, and bimetals, which provide temperature signals and cutout functions that help prevent winding damage during overload. The stator uses motor length code B, balancing torque capability with axial space for retrofit or compact spindle arrangements. It is classified as a stator for a 1MB frameless spindle motor, and it completes the magnetic circuit when installed in a customer-supplied housing.