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 control apparatus for a permanent magnet synchronous motor capable of performing highly accurate torque control not only during low-speed operation and medium-speed operation but also during high-speed operation without increasing a burden on a product CPU irrespective of whether the permanent magnet synchronous motor is an SPM motor or an IPM motor. The control apparatus includes a torque correction circuit that generate a torque correction command from a current phase of current correction commands on a d-axis and a q-axis and a torque command and supplies the torque correction command to a d/q-axis current command generator instead of the torque command.

Abstract: A control apparatus for a permanent magnet synchronous motor capable of performing highly accurate torque control not only during low-speed operation and medium-speed operation but also during high-speed operation without increasing a burden on a product CPU irrespective of whether the permanent magnet synchronous motor is an SPM motor or an IPM motor. The control apparatus includes a torque correction circuit that generate a torque correction command from a current phase of current correction commands on a d-axis and a q-axis and a torque command and supplies the torque correction command to a d/q-axis current command generator instead of the torque command.

Abstract: A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 for generating, in accordance with a speed instruction signal, a q-axis current component orthogonal to the magnetic field of the motor 14; a loss calculating means 50 for calculating a loss by summing a copper loss and an iron loss in the motor 14; a d-axis current generating means 52 for generating, in accordance with the value that is the motor's rated loss decreased by the loss, a d-axis current instruction signal to flow into the motor 14; and a resistor-on-judgment unit 58 for judging, from the DC voltage, whether or not the motor 14 operates in its recovery state and activating the d-axis current generator 52 while in the recovery state.

Abstract: A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 for generating, in accordance with a speed instruction signal, a q-axis current component orthogonal to the magnetic field of the motor 14; a loss calculating means 50 for calculating a loss by summing a copper loss and an iron loss in the motor 14; a d-axis current generating means 52 for generating, in accordance with the value that is the motor's rated loss decreased by the loss, a d-axis current instruction signal to flow into the motor 14; and a resistor-on-judgment unit 58 for judging, from the DC voltage, whether or not the motor 14 operates in its recovery state and activating the d-axis current generator 52 while in the recovery state.