Product Description:

The 1MS105N-4B-A1 stator is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It forms the stationary half of a frameless spindle motor that delivers high rotational energy to machine tools, packaging spindles, and other automated equipment. The unit follows motor length code N and incorporates an aluminum cooling jacket for direct liquid circulation, enabling tight thermal regulation during continuous duty. By providing the electromagnetic field in a compact, housing-free format, it simplifies integration into custom spindle assemblies where space constraints and high speed are primary design drivers.

During continuous operation, the stator is designed to convert electrical input into a mechanical output of 5.5 kW. At its rated condition, the rotor reaches 2400 rpm while the active magnetic field delivers 22 Nm of shaft torque, all sustained with a phase draw of 16.4 A. These figures align with a torque constant of 1.56 Nm/A, meaning each additional ampere produces a proportional rise in torque over the usable range. Heat generated in the copper is removed by the specified liquid-cooling circuit that flows through the aluminum jacket, and power is supplied through a 2.5 mm² lead set bundled in a 1.5 m loom that exits the stator end. The winding resistance of 1.901 Ω limits I²R losses, while the 4B winding layout sets the slot and turn configuration for this frame size.

For dynamic acceleration, the system can reach speeds up to 12000 rpm, supported by a peak torque of 53 Nm. To reach those transients, the drive may momentarily supply up to 35.1 A, a level calculated against the inductive reactance of 9.284 mH per phase. The low inductance permits rapid current rise without excessive voltage demand, supporting fast tool changes and brief overload events while staying within the intended thermal range of this stator design.