1MS240H-4B-A2 Bosch Rexroth Indramat
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MPN: R911253871
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The Bosch Rexroth Indramat 1MS240H-4B-A2 is a stator for the 1MB Frameless Spindle Motor and is part of the 1MB High-Speed Asynchronous Motors series. It features a frame size of 240 with an H length code and uses liquid cooling with an aluminum cooling jacket. The stator includes a 1.5 meter connection cable conducted through the stator end and utilizes a 4B winding variant.
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Product Description:
The 1MS240H-4B-A2 is a stator assembly manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Serving as the fixed magnetic field generator inside a frameless spindle drive, it works with a companion rotor to produce the torque and speed demanded by automated milling, drilling, and grinding systems. By isolating the electromagnetic core from rotating masses, the unit allows machine builders to place bearings and sensor packs directly around the rotor, supporting compact, high-speed axes in modern industrial automation.
The stator is cooled by liquid cooling, a method that channels a water-glycol flow around the lamination stack so copper and iron losses are removed without dependence on cabinet air. Its mechanical envelope corresponds to frame size 240, giving a 240 mm outer diameter that lines up with standardized spindle housings. Axial depth uses length code H, which increases the active material length for higher power density within this frame. A factory-terminated 1.5 m loom carries phase conductors and temperature sensors ready for connection to the inverter and supervisory PLC.
Cabling leaves the machine through dedicated stator-end routing, clearing the interior bore for toolholder shafts and drawbar mechanics. Heat is transferred outward by an aluminum cooling jacket, whose conductivity spreads thermal load uniformly into the circulating fluid. Within the slots, the dedicated 4B winding supplies the impedance and back-EMF profile expected by high-frequency Rexroth drive modules, while the open housing geometry seats directly against a frameless spindle motor flange for minimal radial stack-up. This arrangement provides a stable coolant-jacket interface that helps keep winding temperatures controlled during prolonged high-speed machining cycles.
