Abstract: A motor control device includes a motor-speed detection unit detecting and outputting a detected motor speed based on an output signal of an encoder connected to a motor that is a synchronous motor; a motor electric-angle detection unit detecting and outputting a detected motor electric angle based on the output signal; a motor electric-angle estimation unit receiving a motor voltage, a motor current, and the detected motor speed, and estimating and outputting an estimated motor electric angle based on the motor voltage and the motor current; and a switching unit receiving the detected motor electric angle and the estimated motor electric angle, determining whether the encoder is operating normally based on the detected motor electric angle and the estimated motor electric angle, outputting the detected motor electric angle when the encoder is operating normally, and outputting the estimated motor electric angle when the encoder is not operating normally.

Abstract: A motor control device that controls motion of a control target including a motor and a vibratable element includes a generating unit configured to generate, according to state information representing a state of the control target related to a vibration characteristic of the control target, a first parameter representing the vibration characteristic of the control target, a first calculating unit configured to calculate a second parameter corresponding to a temporal change amount of the first parameter generated by the generating unit, a second calculating unit configured to calculate, using a motion target value, the first parameter, and the second parameter, model torque such that the control target does not excite vibration, and a developing unit configured to develop, according to the model torque calculated by the second calculating unit, a torque command such that the motion of the control target follows the motion target value.

Abstract: A motor control device that controls motion of a control target including a motor and a vibratable element includes a generating unit configured to generate, according to state information representing a state of the control target related to a vibration characteristic of the control target, a first parameter representing the vibration characteristic of the control target, a first calculating unit configured to calculate a second parameter corresponding to a temporal change amount of the first parameter generated by the generating unit, a second calculating unit configured to calculate, using a motion target value, the first parameter, and the second parameter, model torque such that the control target does not excite vibration, and a developing unit configured to develop, according to the model torque calculated by the second calculating unit, a torque command such that the motion of the control target follows the motion target value.

Abstract: An accurate load position control is made possible even when rigidity of a load drive system using a motor is relatively low. Load position signal xl is a present-position measurement value of a load, and after compensation in response to a phase delay thereof has been performed by a stability compensation circuit, the high-frequency portion thereof is taken as a control-target position signal xfb by replacing, in a position-signal combination circuit, a motor position signal xm as a present-position measurement value of a motor, and then the control-target position signal xfb is fed back to a position control circuit. Thereby, a torque command signal indicating a torque target value for driving the load is outputted.

Abstract: Even when rigidity of a load drive system using a motor is relatively low, by performing a load position control in which a load position signal is fed back as stable as a semi-closed control system in which only a motor position signal is fed back, an accurate load position control can be made possible. Therefore, regarding a load position signal xl as a present-position measurement value of a load 20, after compensation in response to a phase delay thereof has been performed by a stability compensation circuit 80, the high-frequency portion thereof is taken as a control-target position signal xfb by replacing, in a position-signal combination circuit 90, by a motor position signal xm as a present-position measurement value of a motor 30, and then the control-target position signal xfb is fed back to a position control circuit 110; thereby, a torque command signal indicating a torque target value that the motor 30 drives the load 20 is configured to be outputted.