The Bosch Rexroth KDF Variable Frequency Drives series is a family of cabinet-mounted drive modules designed to control AC motor speed and torque in industrial automation systems.
The series is built around a DC bus power architecture and includes multiple current classes, allowing the drives to be matched to different motor and machine requirements. KDF drives were used in applications that required controlled spindle or motor operation, with versions configured for blower cooling and separate control-voltage inputs. Within the machine electrical system, these units function as integrated drive hardware rather than as standalone general-purpose inverters, and they are intended to operate with the associated Rexroth power and control components. The series is most relevant in legacy installations where replacement drive hardware must remain compatible with the original cabinet layout, electrical interface, and drive-system configuration.
