Apart from matching drive voltage and current output to the motor’s requirements, several other factors are to be accounted for selecting a servo drive. Some drives are manufactured with specialized functions for specific demands. This guide covers the selection based on some of the common factors for most applications.
1. Commonly Paired Motors with Servo Drives
Motors operating in a closed-loop system like stepper, induction, and asynchronous ones are paired with servo drives. In motion control applications, the AC synchronous motors are paired with servo drives. Another common type is the DC brushless motor.
2. Feedback
Feedback is a crucial part of servo systems for closed-loop operation, error detection and correction of motor’s actual position, torque, and velocity. The feedback is generally provided by encoders, resolvers, or hall sensors. Other than that, the servo drive must be compatible with the motor signal for processing and communicating.
3. Voltage and current
Any motor-drive relationship derives from the power, which means drive’s maximum voltage, peak, and continuous current should be sufficient enough to produce speed, torque, and position for the motor. Manufacturers facilitate torque-speed curves for performance reportage on motor-drive combinations.
4. Analog/Digital
New digital servo drive varieties enable analog/digital inputs for command execution while the software does the tuning. These are also capable of path generation, internal function monitoring, and fault diagnostics.
5. Integrated safety
Whether AC or DC servo drive, safety standards under regulations for all machines are mandatory. Therefore, manufacturers are responsible for establishing of highest standard manufacturing with integrated safety.
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