Inverter control device and inverter control method

An inverter control device comprising:

• an inverter configured to convert direct-current power inputted from a direct-current power supply into alternating-current power, and to supply the alternating-current power to a motor;
• a command value calculation unit configured to calculate a command value of an alternating-current voltage outputted from the inverter, on the basis of a detection value of an alternating current;
• a phase compensation unit configured to compensate for any of a phase of the command value and a phase of the detection value;
• an inverter control unit configured to control the inverter on the basis of any of the command value and the detection value compensated for by the phase compensation unit;
• a motor rotational velocity detection unit configured to detect a rotational velocity of the motor;
• a current detection unit configured to detect the detection value by detecting phase currents of the motor;
• and
• a first coordinate transformation unit configured to perform coordinate transformation of the phase currents into d- and q-axis currents, wherein the phase compensation unit compensates for phases of the d- and q-axis currents, wherein
• the phase compensation unit calculates a phase lead amount by multiplying the rotational velocity by a phase compensation time determined on a basis of an inherent characteristic of the motor, and compensates for a phase based on an inherent characteristic of the motor in accordance with the phase lead amount, and
• the phase compensation unit compensates for a rotating angle of the coordinate transformation by the first coordinate transformation unit on the basis of the phase lead amount.

A method of controlling an inverter comprising:

• an operation of converting direct-current power inputted from a direct-current power supply into alternating-current power and supplying the alternating-current power to a motor;
• a detection operation of detecting an alternating current outputted from the inverter;
• a calculation operation of calculating a command value of an alternating-current voltage outputted from the inverter, on the basis of a detection value detected in the detection operation;
• a compensation operation of compensating for a phase of any of the command value and the detection value;
• an operation of controlling the inverter on the basis of any of the command value and the detection value compensated for in the compensation operation;
• an operation of detecting a rotational velocity of the motor an operation of detecting the detection value by detecting phase currents of the motor;
• and
• an operation of transforming the phase currents into d- and q-axis currents, wherein in the compensation operation, a phase lead amount is calculated by multiplying the rotational velocity by a phase compensation time determined on a basis of an inherent characteristic of the motor, and a phase based on an inherent characteristic of the motor is compensated for in accordance with the phase lead amount,
• the calculation operation includes
• an operation of calculating d- and q-axis current command values on the basis of a torque command value and the rotational velocity of the motor, and
• an operation of calculating d- and q-axis voltage command values to conform the d- and q-axis currents to the d- and q-axis current command values,
• in the compensation operation, the phases of the d- and q-axis voltage command values are compensated for.

A method of controlling an inverter comprising:

• an operation of converting direct-current power inputted from a direct-current power supply into alternating-current power and supplying the alternating-current power to a motor;
• a detection operation of detecting an alternating current outputted from the inverter;
• a calculation operation of calculating a command value of an alternating-current voltage outputted from the inverter, on the basis of a detection value detected in the detection operation;
• a compensation operation of compensating for a phase of any of the command value and the detection value;
• an operation of controlling the inverter on the basis of any of the command value and the detection value compensated for in the compensation operation;
• and
• an operation of detecting a rotational velocity of the motor,
• an operation of detecting the detection value by detecting phase currents of the motor;
• and
• a transformation operation of transforming the phase currents into d- and q-axis currents, wherein
• the compensation operation includes:
• an operation of calculating a phase lead amount by multiplying the rotational velocity by phase compensation time determined on the basis of an inherent characteristic of the motor;
• an operation of compensating for phases of the d- and q-axis currents in accordance with the phase lead amount, and
• an operation of compensating for a rotating angle of the coordinate transformation in the transformation operation on the basis of the phase lead amount.