PHASE CURRENT DETECTION METHOD, INVERTER CONTROL METHOD, MOTOR CONTROL METHOD, AND APPARATUSES USED IN THESE METHODS

摘要

A phase current detection apparatus includes an output time detection unit for receiving a voltage vector instruction and detecting a voltage vector for which output time should be increased, an output time increase unit for receiving a voltage vector instruction and the voltage vector detected by the output time detection unit and performing increase of the output time, a subtraction unit for subtracting the actually output voltage vector length from the voltage vector instruction and outputting an error, an output error accumulation unit for accumulating errors from the subtraction unit so as to calculate an accumulated error of output for the voltage vector instruction, an inverse vector generation unit for outputting an inverse vector of the voltage vector increased, and a selection unit for switching according to a sign of the accumulated error from the output error accumulation unit so as to select an output from the output time increase unit, an output from the inverse vector generation unit, and an output from the inverse vector generation unit. With this configuration, it is possible to reduce the cost, to obtain stable detection of phase current of a desired timing, and to significantly reduce the voltage waveform distortion.