Product Description:

The KDA 3.2-100-3-AQI-W1 is a spindle drive module manufactured by Bosch Rexroth Indramat and placed within the KDA Spindle Drives series. Serving as a power stage for high-speed motorized spindles, it converts energy from the shared DC bus into controlled three-phase output while accepting speed references from CNC or PLC controllers. In machining centers and grinding systems, the unit delivers rapid acceleration and maintains precise spindle velocity so cutting tools match programmed surface speeds. Its role is to regulate motor current and output frequency so the spindle responds smoothly during speed changes and load variations.

This version supplies a continuous motor current of 100 A, drawn from a DC link stabilized at 300 VDC. Thermal dissipation is handled by a mounted heat sink blower that works under forced cooling, keeping power semiconductors within safe junction limits during extended machining cycles. The blower motor is energized from an auxiliary source rated at 220 V/50–60 Hz, so the cooling assembly can operate independently of the main output stage. Spindle velocity commands enter the drive as an analog signal, providing smooth voltage-to-frequency modulation from the supervisory control card. This arrangement allows the higher-level control to vary spindle speed without requiring a separate digital command channel.

The drive operates in ambient air from 5 to 45 °C and at elevations up to 1000 m above sea level without derating. A built-in incremental encoder output passes spindle position data to downstream devices that need a synchronized motion signal. The drive is in Series 3 and uses design version 2. That output can be used where spindle motion must be monitored in parallel with the main control loop. Stable speed regulation is important in machine tools when cutting forces change during a programmed cycle.