Product Description:

The 1MS160D-4B-A1 is a stator manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. This component forms the fixed magnetic assembly inside a frameless spindle motor set and pairs with a separate rotor to generate electromagnetic torque at high speeds. In this arrangement, the stationary winding assembly becomes part of the spindle structure rather than a separate housed motor. By installing the stator directly into the machine housing, the motor can be integrated into compact spindle units that deliver sensor-controlled drive power to machining centers, turning equipment, and automated tool changers.

This stator removes heat through liquid cooling, which circulates coolant across the external jacket to stabilize winding temperature during long duty cycles. This cooling method helps the motor maintain steady thermal behavior during sustained spindle loading. The unit uses frame size 160, so its outside diameter matches other 1MB components built on the same base size. Within that frame, motor length code D indicates an extended core length that increases copper volume and supports higher continuous current capacity. External heat transfer is improved by the integrated aluminum cooling jacket, and the slot design follows winding variant 4B, which sets the turn count and coil pitch for the intended voltage constant and torque output at high spindle speeds.

System cabling is provided through a 1.5 m cable loom that exits through the rear face with cable routing at the stator end, keeping electrical connections inside the machine enclosure and away from rotating parts. This layout also keeps the rotor area clear during operation. Because the unit is supplied as a stator for a 1MB Frameless Spindle Motor, it mounts directly into the spindle housing without an additional frame and preserves the frameless architecture required for short axial build lengths. When paired with a compatible rotor, the stator supports stable magnetic performance and reliable torque during extended production runs without external fan assistance.