Patent ID: 6639376
Filing Date: 2003-10-28
Classification: G05B

Abstract:
A frequency characteristic identifying method executable in a drive controlling apparatus that controls driving of a servo motor, the method comprising:receiving an instruction value; generating as a signal one of (i) a sequential signal including sequential sine waves with different frequencies and identical amplitudes, and (ii) a superimposed signal including a plurality of superimposed signals having different frequencies and identical amplitudes; adding the instruction value to the signal generated to produce an added signal; driving a servo motor based on the added signal; measuring a parameter of the servo motor while the servo motor is being driven; calculating a characteristic value based on the parameter measured; calculating a difference between the characteristic value and a reference value; determining whether the difference is within a range; and when the difference is not within the range, changing amplitude of the signal generated so that the characteristic value converges to the reference value.