Product Description:

The KDA 3.2-150-3-A00-U1 spindle drive is produced by Bosch Rexroth Indramat for the KDA Spindle Drives series. The unit is Series 3 and Version 2, and it regulates high-speed machining spindles by converting a regulated DC bus into three-phase output currents. In an automation cell, it accepts velocity references from the CNC in analog form and adjusts spindle torque to the commanded profile, allowing accurate cutting speeds while protecting the motor and tooling. The unit also mates with the motor’s primary feedback device and omits a secondary encoder connection to keep cabinet wiring straightforward. This arrangement helps the spindle maintain stable speed during changing cutting loads.

The power section is rated for 150 A, so continuous armature current up to this value can be delivered without derating when adequate airflow is maintained. It draws energy from a 300 VDC supply, matching Indramat TVM and KVR power modules used in shared-bus racks. Thermal management is handled by a mounted heat sink blower that pulls air across the fin stack; this hardware uses forced cooling to keep semiconductor junctions below their limits during sustained high-speed operation. Air moves directly across the fins rather than relying on passive heat dissipation alone. This cooling arrangement supports continuous spindle duty during roughing, finishing, and rapid positioning cycles.

The heat sink fan is powered from a dedicated 115 V/50–60 Hz auxiliary line, so blower performance remains independent of the DC bus. The drive operates in ambient conditions from 5 to 45 °C and at elevations up to 1000 m above sea level; outside these limits, current or switching frequency must be reduced. Speed reference arrives as an analog speed command, and there is no additional interface option when only primary motion control signals are required. This signal arrangement keeps the control path focused on the primary spindle command.