| 摘要 |
PROBLEM TO BE SOLVED: To provide a control device for a permanent magnet synchronous motor capable of estimating a stable angle/speed even in the case where a rotation speed is spread over the vicinity of zero.SOLUTION: The control device comprises: power conversion means 14; current detection means 15; a current observer 22 which calculates an estimate of an armature current from a voltage, a current and inductance of a permanent magnet synchronous motor 100, magnetic fluxes of magnetic poles of permanent magnets, armature resistance, an output frequency of the power conversion means 14 and an observer gain; angle estimation error calculation means which calculates an angle estimation error of the magnetic poles of the motor 100; speed estimation error calculation means 31 which calculates a speed estimation error using the inductance of the motor 100, the magnetic fluxes of the magnetic poles of the permanent magnets, a current detection value and a deviation between the current estimate of the current observer 22 and the current detection value; and speed estimation means which calculates a value as a speed estimate, the value being obtained by adding a value resulting from performing a proportional integral operation on the angle estimation error and a value resulting from multiplying the speed estimation error by an adjustment gain.SELECTED DRAWING: Figure 1 |
