摘要:
A motor control device includes a current profile generator generating a current profile, a pilot voltage operator calculating a pilot pulse voltage, on the basis of the current profile, and adding the pilot pulse voltage to a voltage command on a d axis, a magnetic pole position detector detecting a position of a magnetic pole in the permanent magnet motor, on the basis of the pilot pulse voltage, a polarity identification evaluation current operator calculating a polarity identification evaluation current for identifying a polarity of the magnetic pole in the permanent magnet motor, on the basis of a current value on the d axis in the motor current that has been detected in synchronization with a period of PWM control, and a polarity detector outputting a phase correction amount, on the basis of a deviation between the polarity identification evaluation current and the current profile.
摘要:
The invention has an object to provide a magnetic pole position estimating method and a control apparatus for a synchronous motor which reliably detect the position of a magnetic pole of the synchronous motor to carry out stable control also when a high load is applied or a load is suddenly changed. A coordinate transformer (8) transforms a detected current value is into an impedance observation axis positioned in a place shifted from an estimated magnetic pole position &thgr;{circumflex over ( )} by 45 degrees. A high-frequency impedance estimator (10) estimates high-frequency impedances Zdm and Zqm on two points which are advanced and delayed by an electrical angle of 45 degrees from a &ggr;-axis. A first magnetic pole position estimator (13) estimates a first magnetic pole position estimated value &thgr;{circumflex over ( )} to eliminate a deviation between the high-frequency impedances Zdm and Zqm. A second magnetic pole position estimator (14) inputs a current command value i&dgr;* to estimate an internal phase angle compensating angle &thgr;{circumflex over ( )}r and subtracts the internal phase angle compensating angle &thgr;{circumflex over ( )}r from the first magnetic pole position estimated value &thgr;{circumflex over ( )}, and outputs a second magnetic pole position &thgr;{circumflex over ( )}c.
摘要:
An alternating-current motor control apparatus includes a voltage controller configured to output a command voltage vector so that the command voltage vector is time-averaged for time periods, a square-wave voltage generator configured to control, every time period, amplitudes and phases of voltages to be applied to an alternating-current motor, a current detector configured to detect motor currents at a timing synchronized with periods 1/N-th of the time periods, where N is equal to or larger than one, a coordinate transformation section configured to perform coordinate transformation to transform the motor currents into two-phase currents, an envelope extractor configured to extract two-phase currents as waveforms having amplitudes that periodically change from the two-phase currents, and extract envelopes of the waveforms, and a magnetic-pole-position computing section configured to compute a magnetic-pole position using the envelopes.
摘要:
An alternating-current motor control apparatus includes a stator frequency computing unit configured to compute a stator frequency of a motor magnetic flux; a torque error computing unit configured to compute a torque error by using the motor magnetic flux, an estimated current, and a motor current; and a speed estimator configured to estimate a speed of the alternating-current motor by using the stator frequency and the torque error. The speed estimator includes a proportional controller configured to reduce the torque error to zero, and an adaptive filter configured to eliminate a high-frequency component of the torque error.
摘要:
An inverter control apparatus includes: a state estimator that calculates an estimated current vector and an estimated magnetic flux vector from a motor command voltage vector, a detected current vector, and a motor parameter; a correction voltage calculator that calculates a correction voltage vector on the basis of a current error between the detected current vector and the estimated current vector; and a correction voltage unit that adds the correction voltage vector to the motor command voltage vector.
摘要:
It is an object of the invention to provide a sensorless control apparatus of an AC motor which can carry out a stable control within all driving ranges including a region having a zero speed and a zero output frequency. The invention includes a high frequency generator (110) for superposing a high frequency signal on an estimated magnetic flux axis, a high frequency component extractor (130) for extracting an error signal of a magnetic flux position from a voltage or current detection signal having the same frequency component as a frequency component of the high frequency signal, a magnetic flux observer (120) for estimating a magnitude and a position of a magnetic flux, a first adaptive regulator for adaptively regulating an error signal on a high frequency superposing side, a second adaptive regulator for adaptively regulating an error signal on a magnetic flux observer side, a hybrid device (140) for switching the first adaptive regulator at a very low speed, the first and second adaptive regulators at a low speed and the second adaptive regulator at a high speed depending on the speed, and a speed estimator (150) for estimating a speed from an output of the hybrid device.
摘要:
An alternating-current motor control apparatus includes an inverter unit, a current-command divider, a current controller, a torque-variation calculator, and a phase angle generator. The current-command divider is configured to divide a command current amplitude into command current components based on a phase-angle command value that is a sum of the phase angle and an alternating current signal. The torque-variation calculator is configured to calculate a motor electric power based on the command voltage and either the motor current or the command current components and to calculate a torque variation based on the motor electric power. The phase angle generator is configured to generate a phase angle based on the torque variation.
摘要:
A control device includes a slip calculator that calculates a first slip frequency of an induction motor, a current detector that detects motor current that passes through the induction motor, an adder that calculates a primary frequency by adding a speed command and a second slip frequency that are given, a command voltage generation unit that generates first command voltage from the primary frequency, a voltage error observer unit that estimates a command voltage error from the first command voltage and the motor current, a slip correction unit that calculates a slip correction amount from the command voltage error, an adder that calculates the second slip frequency by adding the first slip frequency and the slip correction amount, and a voltage error correction unit that corrects the first command voltage using the command voltage error and outputs second command voltage.
摘要:
An inverter control apparatus includes: a state estimator that calculates an estimated current vector and an estimated magnetic flux vector from a motor command voltage vector, a detected current vector, and a motor parameter; a correction voltage calculator that calculates a correction voltage vector on the basis of a current error between the detected current vector and the estimated current vector; and a correction voltage unit that adds the correction voltage vector to the motor command voltage vector.
摘要:
The present invention provides an initial pole position estimating apparatus and method for an AC synchronous motor without using magnetic pole detector. The initial pole position estimating apparatus includes a thrust force or torque pattern generating portion for generating a thrust force or torque pattern, a pole position command generating portion for generating a pole position command, and a position detecting portion for detecting a position of the AC synchronous motor. The initial pole position estimating apparatus can estimate an initial pole position in a short time with high precision without depending on a fluctuation in a load. The initial pole position estimating apparatus further includes a pole position correcting portion (8) for correcting the pole position command and a thrust force or torque pattern correcting portion (9) for correcting the thrust force or torque pattern, and an initial pole position is estimated through a repetitive correction.