INVERTER CONTROLLER AND SENSORLESS DRIVE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide an inverter controller for accurately controlling current and a sensorless drive system.;SOLUTION: An inverter controller comprises an estimation value calculation section 40 for calculating a rotational phase angle estimation value of a synchronous machine M on the basis of current values detected by current detection sections SU and SW and an output voltage target vector in initial estimation. The estimation value calculation section 40 uses the output voltage target vector when current synchronized with a rotor frequency is fed to the synchronous machine M and the current values detected by the current detection sections SU and SW, calculates an error Δθ of the rotational phase angle estimation value of the synchronous machine M and calculates the rotational phase angle estimation value θ_est so that the error Δθ becomes zero with winding resistance R of the synchronous machine M, d-axis average inductance L_da and q-axis differential inductance L_qh as setting values when an inverter main circuit section INV is started from a stop state.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT