Systems and methods for operating a motorized system. The methods comprise by a circuit: receiving a first position signal generated by a gimbal resolver coupled to a load, a second position signal generated by a first motor encoder coupled to a shaft of a first motor, and a third position signal generated by a second motor encoder coupled to a shaft of a second motor; converting the second and third position signals into a velocity signal specifying a scaled velocity of the load; converting the velocity signal into a fourth position signal specifying a position of the load; combining the first position signal and the fourth position signal to generate a fifth position signal representing a stable position of the load; and using the fifth position signal to control operations of the first and second motors.

The electric motor speed control apparatus in an embodiment comprises a rotation speed estimation unit and a control unit. The rotation speed estimation unit generates an estimated value of a rotation speed of an electric motor by using a result of FFT analysis of a speed detection signal ωFBK, which is based on a detection result from a resolver for detecting the rotation speed of the electric motor, and the speed detection signal ωFBK. The control unit implements speed control so as to reduce deviation between the estimated value of the rotation speed and a speed command value for speed control of the electric motor.

Position and speed correction are applied to observed values from a position sensor in order to operate an electric motor. Observed position values and observed speed values are obtained from the position sensor for time points during a sampling window, ideal position values and ideal speed values are determined for each of the time points, and position and speed error values are determined based on the observed and ideal values. Stored position information is updated using the position error values and the speed error values. The electric motor is operated using corrected position values and corrected speed values that are determined from the observed position values, the observed speed values, and the stored position information.

An arithmetic processing device for resolver signal including: an A/D converter for converting a rotation detection signal of a rotation detection sensor supplied from the outside into a digital signal; and a logic unit constituting a logic circuit that calculates the angle of the script detection sensor from the digital signal output from the A/D converter, wherein the amplifier, the A/D converter, and the logic unit are mounted in the same chip or in the same package.

Disclosed is an apparatus for excitation signal generation for a resolver. The apparatus includes a sine wave generator that generates a sine wave based on a square wave, an amplifier that amplifies the sine wave, a differential signal generator that converts, into a differential signal, the amplified sine wave, a driver that inputs the differential signal to a coil, and a processor that generates an excitation signal by increasing a voltage of the sine wave from a start voltage to a target voltage through at least one of the sine wave generator and the amplifier based on a transient current that flows into the coil in a transient response interval.

The electric motor speed control apparatus in an embodiment comprises a rotation speed estimation unit and a control unit. The rotation speed estimation unit generates an estimated value of a rotation speed of an electric motor by using a result of FFT analysis of a speed detection signal ?FBK, which is based on a detection result from a resolver for detecting the rotation speed of the electric motor, and the speed detection signal ?FBK. The control unit implements speed control so as to reduce deviation between the estimated value of the rotation speed and a speed command value for speed control of the electric motor.

An example method includes: receiving a sine feedback signal and a cosine feedback signal from a resolver; generating a rectified sine signal and a rectified cosine signal; determining a direction of rotation of a shaft of an electric motor using the sine feedback signal, the cosine feedback signal, the rectified sine signal, and the rectified cosine signal; converting the rectified sine signal and the rectified cosine signal into a signed sine signal and a signed cosine signal, respectively, using information associated with determining the direction of rotation; determining a speed of rotation of the shaft using the signed sine signal and the signed cosine signal; comparing the direction and the speed of rotation to respective direction and respective speed of rotation determined by a resolver-to-digital converter; and operating the electric motor based on the comparing.

Disclosed is an apparatus for excitation signal generation for a resolver. The apparatus includes a sine wave generator that generates a sine wave based on a square wave, an amplifier that amplifies the sine wave, a differential signal generator that converts, into a differential signal, the amplified sine wave, a driver that inputs the differential signal to a coil, and a processor that generates an excitation signal by increasing a voltage of the sine wave from a start voltage to a target voltage through at least one of the sine wave generator and the amplifier based on a transient current that flows into the coil in a transient response interval.

A method includes receiving a sine feedback signal and a cosine feedback signal from a resolver coupled to an output shaft of an electric motor. Rectified sine and cosine signals are generated by sampling the feedback signals. A direction of rotation of the output shaft is determined using the feedback signals and the rectified signals. The rectified sine signal and the rectified cosine signal are converted into a signed sine signal and a signed cosine signal, respectively, using information associated with the direction of rotation. A speed of rotation of the output shaft is determined using the signed sine signal and the signed cosine signal. The direction and the speed of rotation are compared to a respective direction and a respective speed determined by a resolver-to-digital converter. The electric motor is operated based on the comparison.