Product Description:

The 1MS376A-QA-A1 is a stator element produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated stator for a 1MB frameless spindle motor, it forms the stationary half of a high-speed spindle assembly and supplies the electromagnetic fields that generate torque for precision machining and other automated cutting processes. The motor length code A indicates the shortest active stack, which helps reduce spindle overhang.

Under continuous load, the unit reaches a rated shaft speed of 450 rpm, where it supplies a steady torque of 220 Nm. This mechanical output corresponds to 10.4 kW of power at the coupling flange. The operating point is obtained with a phase current of 32.4 A, and the magnetic design yields a torque constant of 8.49 Nm/A, allowing torque to be estimated from commanded current. Nine embedded pole pairs synchronize with an inverter to minimize torque ripple, while a winding inductance of 6.097 mH and resistance of 0.742 Ω shape current rise and copper losses. Liquid cooling circulates through an aluminum jacket, and a 1.5 m pre-loomed cable exits the stator end for direct cabinet routing.

For short bursts, the spindle can reach a peak torque of 840 Nm when the inverter supplies a maximum current of 65.1 A, or it can be driven up to 800 rpm electrically for tooling that benefits from higher surface speed. During these overload events, the laminated core dissipates 2.5 kW of heat, so the cooling circuit must maintain a flow of 3.6 l/min to hold winding temperature within limits. The integrated jacket, fed by 10.0 mm² power leads, gives the module a thermal time constant of 10 min, and the stator has a mass of 33.0 kg that should be considered during handling. Connection integrity is aided by the 1.5 m loom.