Rotary machine control apparatus

摘要

A current sensor detects a bus current flowing to an inverter. An estimation section uses actual currents id and id outputted from a d-q conversion section as initial values, estimates currents flowing in a motor/generator and calculates estimated currents ide and iqe. A UVW conversion section converts the estimated current ide and iqe to three phase currents. A selection section inputs, as currents flowing in each phase of the motor/generator, three out of outputs of the UVW conversion section and the bus current. The bus current is used as the current of one phase, if a voltage vector representing an operation state of the inverter is an effective voltage vector.

主权项

1. A rotary machine control apparatus for controlling a control amount including at least one of current, torque and magnetic flux of a rotary machine by turning on and off switching devices of a DC-AC conversion circuit, which selectively connects terminals of the rotary machine to a positive side and a negative side of a DC power source, the rotary machine control apparatus comprising:
an estimation section for setting provisionally an operation state of the DC-AC conversion circuit represented by a voltage vector determined by an on-off operation and estimating the control amount in correspondence to each provisionally set operation state; a determination section for determining the operation state of the DC-AC conversion circuit based on an estimated control amount; an operation section for operating the DC-AC conversion circuit to attain a determined operation state; and an acquisition section for acquiring a detection value of a current flowing in an input terminal of the DC-AC conversion circuit, wherein the estimation section uses, as an initial value for estimating the control amount, an acquired detection value of the current based on the operation state of the operation section; the DC-AC conversion circuit applies output voltages to three terminals of the rotary machine; and the estimation section uses a detection value of the current as a current flowing in either one of the three terminals of the rotary machine, when the voltage vector representing the operation state of the operation section is an effective voltage vector.