Motor controlling apparatus

摘要

A motor controlling apparatus including an inverter, a voltage detector, a rotational speed detector, a command value calculating component, an inverter controller, a state detector and an offsetting component. The inverter converts direct-current power to alternating-current power supplied to a motor. The voltage detector detects a direct-current voltage, and the rotational speed detector detects a rotational speed of the motor. The calculating component calculates current and torque command values, and motor rotational speed. The controller provides a control signal to control the inverter based on the current command value. The state detector detects a control state of the inverter, and the offsetting component offsets the detected voltage or rotational speed by an offset amount. The calculating component modifies the current command value based on the offset detected voltage or rotational speed to increase on a negative side a d-axis current command value included in the current command value.

主权项

1. A motor controlling apparatus comprising:
an inverter configured to convert direct-current power to alternating-current power and supply the power to a motor, the direct-current power being input from a direct-current power source; a voltage detector configured to detect a direct-current voltage of the direct-current power source; a rotational speed detector configured to detect a rotational speed of the motor; a command value calculating component configured to calculate a current command value for an alternating current output by the inverter based on a detected voltage detected by the voltage detector, a torque command value input from an external source, and a detected rotational speed detected by the rotational speed detector; an inverter controller configured to provide a control signal for a switching element included in the inverter and to control the inverter based on the current command value; a state detector configured to detect a control state of the inverter; and an offsetting component configured to offset the detected voltage or the detected rotational speed by an offset amount according to the control state detected by the state detector; the command value calculating component being further configured to modify the current command value based on the detected voltage or the detected rotational speed that was offset by the offsetting component when the control state of the inverter is detected to be unstable by the state detector such that a d-axis current command value included in the current command value becomes more negative as compared to a d-axis current command value derived from the detected voltage before the current command value was modified.