JP2004048868A5 - - Google Patents

Claims (8)

A control unit for synchronous motor speed command input to generate a pulse width control signal to the inverter for driving the synchronous motor an output, wherein the controller includes a sampling means for sampling the current of the inverter, the Current reproducing means for reproducing an alternating current flowing through the synchronous motor based on a sampling current value obtained by sampling of the sampling means; and an dc axis assuming the magnetic pole axis in the synchronous motor as an alternating current generated by the reproduction of the current reproducing means. A dq coordinate conversion means for converting the current to a current on the qc axis orthogonal to the dc axis, and a torque current command for the synchronous motor based on a current component on the qc axis obtained by the coordinate conversion of the dq coordinate conversion means. Torque current command generating means for generating, the dc axis and the qc axis based on the rotational speed command and the torque current command Applied voltage command calculating means for calculating each applied voltage command, phase calculating means for calculating an AC phase related to the driving frequency of the synchronous motor based on the rotational speed command, and phase calculation for each applied voltage command Dq reverse conversion means for converting the coordinates into a three-phase AC voltage command based on the AC phase calculated by the means, a pulse width control signal generation means for generating a pulse width control signal based on the three-phase AC voltage command, and the dc A state quantity computing means for computing a state quantity corresponding to an error angle between the qq axis and the dq axis that is the actual magnetic pole axis of the synchronous motor; and phase correction for correcting the AC phase based on the state quantity And a speed control device for a synchronous motor.   2. The speed control device for a synchronous motor according to claim 1, wherein the state quantity calculation means includes a current component on a qc axis obtained by coordinate conversion of the dq coordinate conversion means and torque generated by the torque current command generation means. A speed control apparatus for a synchronous motor, wherein the state quantity is calculated according to a difference from a current command. 3. The speed control device for a synchronous motor according to claim 1, wherein the state quantity calculation means is obtained by converting the q-axis inductance of the synchronous motor to Lq, winding resistance R, and coordinate conversion of the dq coordinate conversion means. The current component on the qc axis is Iqc, the current component on the dc axis obtained by the coordinate conversion of the dq coordinate conversion means is Idc, the electrical angular frequency command obtained from the rotation speed command is ω1 ^* , and the dc axis is The applied voltage command of Vdc ^* and the applied voltage command on the qc axis is Vqc ^* , based on the following formula (Equation 1):

A speed control apparatus for a synchronous motor, wherein an axis error Δθc is calculated as the state quantity.   4. The speed control device for a synchronous motor according to claim 1, wherein a voltage is calculated from each applied voltage command on the dc axis and the qc axis and an AC phase calculated by the phase calculating means. 5. A voltage phase calculating means for calculating a command phase; an interrupt signal generating means for outputting an interrupt signal for instructing sampling to the sampling means for each specific phase of the voltage command phase calculated by the voltage phase calculating means; A speed control device for a synchronous motor, comprising:   The speed control device for a synchronous motor according to any one of claims 1, 2, and 3, wherein the polarity of each phase is calculated by calculating the polarity of each phase of the three-phase AC voltage command by the output of the dq reverse conversion means. A polarity calculating means for outputting a signal; and an interrupt signal generating means for outputting an interrupt signal for instructing sampling to the sampling means in response to a change in polarity of the polarity signal of any one of the phases. A speed control device for a synchronous motor, comprising:   The speed control device for a synchronous motor according to any one of claims 1, 2, and 3, wherein an absolute value for calculating and outputting an absolute value of each phase of the three-phase AC voltage command by the output of the dq inverse conversion means is provided. An interrupt signal for outputting an interrupt signal for instructing sampling to the sampling means when the absolute value of any two phases of the value calculating means and the absolute value of each phase becomes an approximate value A speed control device for a synchronous motor, characterized by comprising a generating means.   The speed control device for a synchronous motor according to any one of claims 1, 2, and 3, wherein a difference between a current component on a dc axis and a d-axis current command obtained by coordinate conversion of the dq coordinate conversion means. A synchronous motor comprising: a subtracting means for calculating the motor constant; and a motor constant correcting means for correcting a motor constant for calculating an applied voltage command on the qc axis according to a calculation result of the subtracting means. Speed control device.   A synchronous motor, a speed control device for controlling the speed of the synchronous motor, a speed control device for the synchronous motor according to any one of claims 1 to 7, and a compressor using the synchronous motor as a power source; An air conditioner comprising