Product Description:

The 1MS242N-4B-A1/S045 is a stator supplied for integration in frameless spindle assemblies that require high peripheral speed and compact envelopes. It serves as the stationary electromagnetic field generator inside a rotor-stator set used in precision milling, grinding, and turning spindles in industrial automation. In operation, it works with a matching rotor to produce the magnetic field needed for spindle rotation and speed control. Because the active elements are integrated directly into the spindle structure, the design helps conserve installation space and supports rigid machine layouts.

The manufacturing origin, Bosch Rexroth Indramat, places this component within the spindle-drive portfolio, while the 1MB High-Speed Asynchronous Motors series places it in applications above conventional induction-motor speeds. Thermal regulation is handled by closed-loop liquid cooling; coolant passes around the stator housing, allowing continuous high current density without overheating. With a frame size of 242, the stator mates to machine housings that provide a 242 mm outside diameter interface, and its mechanical depth follows motor length code N, which corresponds to the active iron stack height related to available torque and power. These dimensional standards let length variants share the same mounting geometry.

The unit is supplied as a stator for a 1MB frameless spindle motor, so it is ready for shrink-fit assembly around a customer-supplied laminated core. Heat is removed efficiently through an aluminum cooling jacket, which provides high thermal conductivity with low mass. Electromagnetic characteristics are set by winding variant 4B, which sets conductor gauge and coil pitch for the intended voltage and current ratings. Electrical terminations exit through a 1.5 m loom at the non-drive end, providing preassembled leads that reduce wiring time and keep the coolant jacket uninterrupted. This arrangement also keeps the cable exit clear of the rotating spindle area and supports compact housing layouts.