Product Description:

The 1MS376A-QA-A2 is a dedicated stator component designed by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a frameless spindle motor element, the stator integrates directly into machine tool housings where compact, high-torque rotation is required for milling, drilling, and turning operations. When paired with its corresponding rotor, the unit converts three-phase drive energy into controlled rotary motion at moderate shaft speeds for high-performance automation systems.

Under continuous operation, the stator produces a mechanical output of 10.4 kW while maintaining a shaft speed of 450 rpm. At this operating point, it develops a constant torque of 220 Nm, a value supported by the electromagnetic design and the aluminum cooling jacket around the windings. The drive electronics must deliver a nominal phase current of 32.4 A and may rise momentarily to 65.1 A during acceleration or heavy cuts. Torque rises in proportion to armature current with a constant of 8.49 Nm/A, allowing predictable feed-forward control in CNC applications. Nine pole pairs create the rotating field, and the 6.097 mH inductance filters switching harmonics to keep motor heating within the stated 2.5 kW loss budget.

Performance stability depends on efficient liquid circulation. The integrated jacket tolerates inlet pressures up to 6.0 bar and requires a flow rate of 3.6 l/min to remove copper losses before thermal limits are reached. With this cooling, the winding temperature changes according to a thermal time constant of 10.0 min, which permits brief overloads at the maximum torque of 840 Nm without exceeding insulation limits. A low winding resistance of 0.742 Ω minimizes I²R losses, while 10.0 mm² power leads on a 1.5 m cable routed through the stator end help keep voltage drop low and simplify cabinet integration.