Product Description:

The KDA 3.2-100-3-L0I-W1 spindle drive is produced by Bosch Rexroth Indramat as part of the KDA Spindle Drives series. It serves as a dedicated power stage for machine-tool spindles, converting shared DC-link energy into regulated phase currents while receiving motion commands from a CNC controller. This arrangement helps the spindle maintain stable speed during cutting, tapping, and grinding cycles. Direct torque control also helps the drive respond quickly to changing load conditions during machining. The unit is intended for installations where consistent spindle behavior is required across varying process demands.

This model has a rated output of 100 A, which suits medium-power spindle motors used on machining centers. The internal power section is supplied by a shared DC bus at 300 VDC, allowing energy exchange with other axes on the same supply. To remove switching heat, the housing uses a mounted heat sink blower for forced cooling. The blower is powered by an auxiliary supply of 220 V/50–60 Hz, so the cooling circuit remains independent of the drive's DC electronics. This arrangement helps maintain thermal stability in the power section during extended operating periods.

The velocity loop receives its setpoint through the SERCOS interface, and position data can be forwarded through the additional incremental encoder output when a controller requires real-time speed information. A second encoder socket is omitted, so no extra input is available for dual-loop configurations. Digital command transfer avoids the need for an analog speed reference and supports clean integration in multi-axis control cabinets. Reliable operation is specified for ambient temperatures from 5 to 45 °C and for mounting heights up to 1000 m above sea level. Operation outside these limits may require derating.