Servo system

A servo system, comprising:

• a control device;
• and
• a plurality of servo drivers configured to synchronously control a plurality of motors based on a motion command from the control device, each of the plurality of servo drivers including
• a servo signal generator configured to generate a command signal for a corresponding motor of the plurality of motors based on the motion command,
• a PWM calculator configured to generate, based on the command signal generated by the servo signal generator, a PWM control signal with a pulse being modulated, where PWM is pulse width modulation, and
• an inverter configured to generate a drive voltage to drive the corresponding motor by switching a switching element based on the PWM control signal generated by the PWM calculator,
• wherein the PWM calculator performs a first process of generating, using a predetermined parameter set related to a circuit structure including the servo driver and the corresponding motor, a superimposed signal to be superimposed on the command signal, and the superimposed signal differs for each of control axes corresponding to the respective plurality of motors when the command signal is in a low voltage range, and
• the PWM calculator performs a second process of generating the PWM control signal by adding the superimposed signal to the command signal and by comparing a resulting signal with a predetermined carrier signal.