1MS240B-4A-A1 Bosch Rexroth Indramat
Wake Industrial LLC is not an authorized distributor of this product.
Wake Industrial LLC is not an authorized distributor of this product.
MPN: R911247772
Ask for AvailabilityThe Bosch Rexroth Indramat 1MS240B-4A-A1 is a stator designed for the 1MB High-Speed Asynchronous Motors series. It features liquid cooling with an aluminum cooling jacket and comes with a 1.5 meter connection cable conducted through the stator end. The stator has a frame size of 240 and a winding variant of 4A.
Internal Product Review
The 1MS240B-4A-A1 is a stator for a 1MB frameless spindle motor that presents as a well-engineered choice for high-speed machine builds. Liquid cooling paired with an aluminum cooling jacket supports strong thermal stability under demanding spindle duty. A 1.5 m connection cable routed through the stator end makes the 4A winding variant especially appealing for precise installations.
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Product Description:
The 1MS240B-4A-A1 stator is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the stationary section of a frameless spindle motor, it generates the magnetic field needed for high-speed machining spindles and other precision axes. This layout lets machine builders install the active motor components directly into a machine housing or matched rotor assembly, which helps save space in compact spindle designs. Because the rotor and housing are supplied separately, the stator is intended for spindle assemblies that require direct integration rather than a finished motor body.
The thermal design uses liquid cooling, so process water or a water-glycol mixture can circulate through the jacket and remove heat without relying on ambient airflow. Its frame size 240 suits large-bore spindle arrangements, while motor length code B indicates a medium axial stack length within the 240 frame family. An aluminum cooling jacket surrounds the laminations to move heat efficiently from the copper slots to the coolant passages. Electrical behavior is set by winding variant 4A, which corresponds to the turn count and wire gauge used for the matching voltage constant and current rating. This cooling and winding combination supports stable operation during sustained high-speed duty.
For installation, the stator includes a 1.5 m connection cable that is factory loomed and routed through the end of the assembly, so the leads can reach a terminal box without added joints. This part becomes a complete frameless spindle motor only after it is paired with a separate rotor core, because the stator itself contains no rotating element. The preassembled lead helps reduce extra connection points inside the spindle housing and simplifies cable routing through the machine structure. The cable routing, liquid unions, and stator outside diameter are intended for repeatable integration in machine spindles, and the unit can be pressed into a steel or composite sleeve while maintaining thermal transfer and electrical insulation.
