Product Description:

The 1MS105N-4A-A1 stator is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless spindle motor component, it forms the stationary winding assembly that combines with a matching rotor to generate torque for high-speed machine-tool spindles and other automation axes that require compact liquid-cooled drives. Because the stator is frameless, it is intended to be integrated into a spindle structure rather than used as a stand-alone motor housing. A pre-installed 1.5-meter loom exits the stator end for power and sensor cabling.

In the complete motor assembly, the stator supports a continuous output of 7.0 kW when the rotor turns at 4500 rpm, resulting in a shaft load of 15 Nm. At this operating point, the windings draw 29.0 A, and the torque constant is 0.68 Nm/A. Electrical losses reflect a winding resistance of 0.429 Ω, and dynamic response is influenced by an inductance of 1.916 mH. Two pole pairs synchronize with the inverter, and the 4A winding variant is carried on an aluminum cooling jacket that channels liquid through the housing. The assembly weighs 11.2 kg and has a short thermal time constant of 5.0 minutes, which lets process control respond quickly to load changes.

The liquid circuit must supply 3.0 L/min at no more than 6.0 bar inlet pressure, and under this flow the coolant temperature rises only 10 K while the insulation remains protected. With adequate flow, the windings can accept 73.68 A and produce up to 48 Nm, and the rotor may accelerate to 15000 rpm without thermal overload. The stator length code N keeps the overall stack height moderate so it can fit into restricted spindle bores. Liquid cooling removes heat directly from the copper, which supports high torque density and helps keep surrounding cabinet temperatures lower than with forced-air cooling.