Abstract: A drive device for an AC motor includes: an adaptive observation unit that adaptively estimates an angular velocity of a rotor of an AC motor; a speed control unit that determines a first torque command with which an angular velocity command matches an average value of an estimated angular velocity; a phase lead amount calculation unit that calculates, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation; a vibration suppression control unit that determines, based on a frequency of load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and a torque control unit that controls a torque of the AC motor based on the first torque command and the second torque command.

Abstract: A drive device for an AC motor includes: an adaptive observation unit that adaptively estimates an angular velocity of a rotor of an AC motor; a speed control unit that determines a first torque command with which an angular velocity command matches an average value of an estimated angular velocity; a phase lead amount calculation unit that calculates, based on a disturbance frequency, a phase lead amount of a transfer function from a true angular velocity to a model deviation; a vibration suppression control unit that determines, based on a frequency of load torque pulsations, the model deviation, and the phase lead amount, a second torque command with which speed pulsations in the AC motor are suppressed; and a torque control unit that controls a torque of the AC motor based on the first torque command and the second torque command.

Abstract: A controller outputting a voltage instruction for drive control to a electric rotating machine includes a drive voltage instruction calculation section calculating drive voltage instructions for driving the electric rotating machine, a position estimation voltage generator generating position estimation voltage instructions for position estimation about the electric rotating machine, a noise reduction voltage generator generating noise reduction voltage instructions for reducing noise occurring from the electric rotating machine along with input of the position estimation voltage instructions to the electric rotating machine, and adders outputting, to a voltage application means, a voltage instruction obtained by adding the position estimation voltage instructions and the noise reduction voltage instructions to the drive voltage instructions.

Abstract: The second torque value and a motor speed detected from the motor in operation are compared to an upper limit and lower limit of torque tolerance which is obtained based on the third torque value. Accordingly, if the third torque value exceeds the upper limit or underruns the lower limit of the torque tolerance, the motor is stopped in accordance with a difference between the third torque value and the torque tolerance. Consequently, since abnormality of the motor can be promptly and accurately detected within an entire speed range including a lower speed range, it is effective for protecting the motor or the machine equivalent of a load for the motor.

Abstract: A controller outputting a voltage instruction for drive control to a electric rotating machine includes a drive voltage instruction calculation section calculating drive voltage instructions for driving the electric rotating machine, a position estimation voltage generator generating position estimation voltage instructions for position estimation about the electric rotating machine, a noise reduction voltage generator generating noise reduction voltage instructions for reducing noise occurring from the electric rotating machine along with input of the position estimation voltage instructions to the electric rotating machine, and adders outputting, to a voltage application means, a voltage instruction obtained by adding the position estimation voltage instructions and the noise reduction voltage instructions to the drive voltage instructions.

Abstract: An inverter device includes a converter circuit that rectifies a first alternating current output from a power supply to generate a rectified current, a capacitor that stores therein the rectified current and outputs a direct current based on the rectified current, and an inverter circuit that converts the direct current into a second alternating current for driving a load. Moreover, a voltage control unit generates and outputs, during a period when any one of an instantaneous power cut and an instantaneous voltage drop occurs in the power supply, a first current command based on a voltage of the capacitor and a second current command; and a current control unit generates and outputs, based on the first current command, the second current command for controlling the inverter circuit to output the second alternating current.

Abstract: An inverter device includes a converter circuit that rectifies a first alternating current output from a power supply to generate a rectified current, a capacitor that stores therein the rectified current and outputs a direct current based on the rectified current, and an inverter circuit that converts the direct current into a second alternating current for driving a load. Moreover, a voltage control unit generates and outputs, during a period when any one of an instantaneous power cut and an instantaneous voltage drop occurs in the power supply, a first current command based on a voltage of the capacitor and a second current command; and a current control unit generates and outputs, based on the first current command, the second current command for controlling the inverter circuit to output the second alternating current.

Abstract: A CPU calculates, based on a frequency command value for driving a motor and on a state quantity of the motor, an output-voltage command value in which only the phase advances while amplitude is constant in each calculation period, without reducing the calculation period. An ASIC reflects the output-voltage command value in a triangular wave signal in a time-series order to compare with each other, and outputs a PWM signal to a switching circuit. Thus, a waveform of an output voltage is made close to a sine wave irrespective of an output frequency being high or low, and a processing load of the CPU is reduced.

Abstract: An apparatus for controlling a power converter including a voltage-vector control unit that determines, based on voltage instruction value for the power converter, a voltage vector output from a power converter in one control cycle of pulse width modulation control and times for outputting of the voltage vector, a voltage-vector adjusting unit that adjusts the time of outputting of the voltage vector so that time of outputting of a zero-voltage vector is larger than a fixed time or zero, and a firing-pulse generating unit that generates a signal for turning on and off a semiconductor switching element included in the power converter, based on the time of outputting of the voltage vector adjusted by the voltage-vector adjusting unit.

Abstract: An influence resulting from double saliency of an electric motor, i.e., an influence of a deviation of the axis of an alternating current due to a rotor magnetic pole position ? on the estimation of a magnetic pole position, is eliminated, and, in particular, the magnetic pole position of double saliency electric motor can be estimated with high precision.

Abstract: An influence resulting from double saliency of an electric motor, i.e., an influence of a deviation of the axis of an alternating current due to a rotor magnetic pole position ? on the estimation of a magnetic pole position, is eliminated, and, in particular, the magnetic pole position of a double saliency electric motor can be estimated with high precision.

Abstract: A CPU calculates, based on a frequency command value for driving a motor and on a state quantity of the motor, an output-voltage command value in which only the phase advances while amplitude is constant in each calculation period, without reducing the calculation period. An ASIC reflects the output-voltage command value in a triangular wave signal in a time-series order to compare with each other, and outputs a PWM signal to a switching circuit. Thus, a waveform of an output voltage is made close to a sine wave irrespective of an output frequency being high or low, and a processing load of the CPU is reduced.

Abstract: In a control apparatus for a rotating machine, an integration unit integrates a primary angular frequency based on an angular velocity command and computes phase, a power converting unit applies three-phase voltages to the rotating machine according to three-phase voltage commands, a current detecting unit detects three-phase currents flowing through to the rotating machine, a coordinate converting unit converts the currents detected by the current detecting unit into currents on rotating two-axis coordinates based on the phase output by the integration unit and converts voltage commands on the rotating two-axis coordinates into the three-phase voltage commands, and a voltage command computing unit computes the voltage commands based on the absolute value of deviations of the primary angular frequency and the current components along each of the rotating two-axis coordinates.

Abstract: An apparatus for controlling a power converter including a voltage-vector control unit that determines, based on voltage instruction value for the power converter, a voltage vector output from a power converter in one control cycle of pulse width modulation control and times for outputting of the voltage vector, a voltage-vector adjusting unit that adjusts the time of outputting of the voltage vector so that time of outputting of a zero-voltage vector is larger than a fixed time or zero, and a firing-pulse generating unit that generates a signal for turning on and off a semiconductor switching element included in the power converter, based on the time of outputting of the voltage vector adjusted by the voltage-vector adjusting unit.

Abstract: In a conventional rotation state detecting apparatus of a synchronous machine, since short-circuiting must be carried out twice or more when a rotation speed is detected, there have been problems in that it takes a time to detect a rotation state, and it takes a time to start up. A rotation state detecting apparatus for a synchronous machine according to the present invention has been made to solve the above problem, and includes a calculation unit for outputting a voltage vector command and a trigger signal and for outputting a rotation state of a synchronous machine having at least three windings in an idle state, a circuit unit for applying voltages to the respective phases of the synchronous machine on the basis of the voltage vector command, and a detection unit for detecting a current of the synchronous machine on the basis of the trigger signal and outputting a value of the detected current to the calculation unit.

Abstract: In a control apparatus for a rotating machine, an integration unit integrates a primary angular frequency based on an angular velocity command and computes phase, a power converting unit applies three-phase voltages to the rotating machine according to three-phase voltage commands, a current detecting unit detects three-phase currents flowing through to the rotating machine, a coordinate converting unit converts the currents detected by the current detecting unit into currents on rotating two-axis coordinates based on the phase output by the integration unit and converts voltage commands on the rotating two-axis coordinates into the three-phase voltage commands, and a voltage command computing unit computes the voltage commands based on the absolute value of deviations of the primary angular frequency and the current components along each of the rotating two-axis coordinates.

Abstract: In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controller outputs a voltage command on the coordinates so that the current follows a current command on the coordinates. Another coordinate converter converts the voltage command into three-phase voltage commands. An adaptive observer calculates an angular frequency so that a q-axis component of an estimated rotor magnetic flux is zero. An inverter applies a voltage to the motor based on the voltage command.

Abstract: In a control apparatus for a synchronous motor, a coordinate converter converts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controllers outputs a voltage command on the coordinates so that the current follows a current command on the coordinates. Another coordinate converters converts the voltage command into three-phase voltage commands. An adaptive observer calculates an angular frequency so that a q-axis component of an estimated rotor magnetic flux is zero. An inverter applies a voltage to the motor based on the voltage command.

Abstract: In a control apparatus for a synchronous motor, a coordinate converterconverts a detected current into a current on rotational biaxial coordinates (d-q axis). A current controller outputs a voltage command on the coordinates so that the current follows a current command on the coordinates. Another coordinate converterconverts the voltage command into three-phase voltage commands. An adaptive observer calculates an angular frequency so that a q-axis component of an estimated rotor magnetic flux is zero. An inverter applies voltage to the motor based on the voltage command.

Abstract: The invention provides a synchronous motor sensorless controller which drives a synchronous motor without use of a rotational position sensor. The controller has a relative position counter 4 which acquires an estimated position of a magnetic pole from the position-and-speed estimation device simultaneously with resetting a summated value to zero when the reference position signal is input and which starts summation operation; and a speed instruction generator 3 having a position controller 29 which performs position control operation on the basis of a deviation between an instruction value pertaining to the amount of movement from the reference position and a summated value output as a relative position from the relative position counter, the generator outputting a speed instruction. The sensorless controller can position at a predetermined location a synchronous motor not having a position sensor.