Motor control system

A motor control system, comprising:

• a motor control device, including a semiconductor integrated circuit having a memory and forming a control loop for a motor to control a drive of the motor;
• and
• an external debug device, externally connected to the motor control device and accessible to the memory in the motor control device, wherein the control loop is operable to be independent of the external debug device and is operable, when disconnected from the external debug device, to generate a signal indicating a target value of a rotating speed and to access the memory in the motor control device, and wherein the external debug device includes:
• a disturbance signal superimposer, configured to generate a disturbance signal for the control loop, and to transmit the disturbance signal through writing the disturbance signal to the memory in the motor control device when the external debug device is connected to the motor control device;
• and
• a frequency characteristic deriver, configured to derive frequency characteristics of the control loop based on the signal generated in the control loop by superimposition,
• wherein the external debug device includes:
• a debugger including an external signal output unit and externally connected to the motor control device and is arranged between a computing device and the motor control device and wherein under an instruction of the computing device, the disturbance signal is superimposed,
• wherein the motor control device is configured to read the disturbance signal from the memory and superimpose the disturbance signal to the signal in the control loop, and the external debug device is configured to monitor a temperature signal representing a temperature of a predetermined measurement target position in the motor control system so as to monitor the motor control system during derivation of the frequency characteristics.