Product Description:

The KDA 2.1-050-3-LPD-W1 is a spindle drive developed by Bosch Rexroth Indramat for the KDA Spindle Drives series. In a machining center or grinding cell, it regulates spindle speed and torque by converting intermediate DC power into three-phase output matched to the motor. By adjusting motor output in real time, the drive helps the spindle follow commanded speed profiles while resisting disturbance from changing cutting loads. That behavior helps maintain spindle response during tool engagement, deceleration, and speed changes between machining steps.

The drive can deliver a continuous output of 50 A, giving it enough current margin for rapid acceleration of heavy spindle rotors. This current capability also supports steady operation during demanding duty cycles. It operates from a DC bus rated at 300 VDC, which is generated by a separate supply module shared across multiple axes in the machine. Thermal energy is removed through a mounted heatsink blower powered from a dedicated 220 V 50–60 Hz AC source, and the unit uses Forced Cooling to keep the power electronics within safe junction limits during prolonged operation. Speed commands arrive over the fiber-optic SERCOS Interface, allowing the drive to synchronize with other motion devices on the same real-time network without additional control wiring.

The housing may be installed up to 1000 m above sea level without derating, and reliable performance is maintained across an ambient range of 5 to 45 °C. These operating limits suit typical workshop installations where air conditions vary during daily production. For axis coordination, a separate channel accepts a digital position command value, allowing the CNC to send fine positioning references independently of the main velocity loop. A second encoder input supports spindle feedback or additional motor feedback, which allows high-resolution speed monitoring or tandem-motor alignment when tighter control is required.