Product Description:

The KDA 3.1-150-3-AQD-W1 spindle drive is manufactured by Bosch Rexroth Indramat for the KDA Spindle Drives series. Within a machine-tool cabinet, it couples the common DC link to the spindle motor and modulates three-phase output so speed and torque follow controller demands during cutting, drilling, or grinding cycles. The product’s role in industrial automation is to translate numerical program commands into repeatable spindle motion, allowing cutters or grinding wheels to maintain the surface speeds required for dimensional accuracy, surface finish, and cycle-time consistency on automated production lines. That makes the drive suitable for machine tools that rely on stable spindle behavior during changes in material load.

It receives energy from a shared bus at 300 VDC, and its IGBT bridge is dimensioned for a continuous phase output of 150 A. This current capacity supports demanding spindle acceleration and continuous machining loads. A separate single-phase feed of 220 V/50–60 Hz powers the blower, isolating cooling demand from the DC link. Because the blower uses an external AC feed, cooling does not add load to the shared bus. The drive’s aluminum heat sink is fitted with a heat sink-mounted blower that moves air directly across the fins, and the drive uses forced cooling. This arrangement helps maintain semiconductor temperature so the full rated current can be sustained during prolonged roughing cuts or rapid acceleration sequences.

Site conditions must stay within an ambient range of 5 to 45 °C, and mounting is allowed up to 1000 m above sea level. Outside these limits, thermal rise and partial-discharge risk increase. The velocity loop accepts an analog speed command, while a separate channel handles the digital position command value so spindle orientation can be synchronized with tool changers or tapping cycles. This arrangement lets the control system manage continuous spindle rotation and indexed spindle positioning through separate command paths. Separate speed and position paths are useful when the spindle must alternate between free-running motion and precise angular alignment.