Product Description:

Kollmorgen manufactures the CR10551 as a servo drive in the CD Servostar CD Drives series. The unit belongs to the Compact Drive product family and is intended to regulate current, velocity, and position loops for brushless servo motors on assembly lines, packaging machinery, and material-handling cells. By converting DC bus energy into controlled three-phase output while monitoring resolver feedback, it serves as the power stage between the motion controller and the motor in a closed-loop axis. This arrangement lets the drive respond to command changes quickly while keeping motor operation stable during starts, stops, and speed changes.

The analog command channel accepts a differential reference with 14-bit resolution, allowing fine torque or speed updates without significant quantization error. Internally, the current loop executes at 16 kHz, so phase currents are corrected every 62.5 µs for tight electromagnetic control. During continuous operation, the power stage delivers 10 A of current, while transient maneuvers can draw up to 20 A for rapid acceleration. Velocity feedback is sampled and processed at 4 kHz, giving the controller adequate bandwidth to suppress load disturbances. The resolver interface excites the sensor with 4.25 VAC and receives 2 VAC return signals at a transformation ratio of 0.47. These control rates help the drive maintain smooth motor response when commanded speed or torque changes abruptly.

Energy returned from decelerating loads can be dissipated through an external shunt rated at 200 W, and the regenerative circuit requires a minimum braking resistor value of 20 Ω to prevent overvoltage. The position loop closes at 2 kHz, working with a resolver excitation current limit of 55 mA ACRMS and a maximum DC input resistance of 120 Ω on the analog leads. Mechanical accuracy is supported by a resolver tracking tolerance of 19 arc-min, which is suitable for medium-precision indexing tasks. Differential signaling also helps reduce noise pickup on low-level command and feedback wiring.