Reducing servomotor instability

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Overview:
Instability in a motor is uncontrolled and unintended motion at the motor shaft and can occur at any frequency. It's caused by excessive gain in the speed controller of the drive, and the gain setting of the speed controller determines how much torque the drive will generate. As servo drives become more prevalent in industry, they are being applied in a wider range of applications. Servo motors sometimes make a "growling" noise, which can be eliminated by reducing the gain on the speed controller, but lower speed controller gains can lead to an increase in position error and a decrease in performance. This paper looks at the methods that can be used to eliminate servo instability.