CONTROL DEVICE OF PERMANENT MAGNET TYPE SYNCHRONOUS MOTOR

摘要

PROBLEM TO BE SOLVED: To enable stable current control and high-accuracy torque control even if a terminal voltage of a permanent magnet type synchronous motor is controlled to a maximum output voltage of a power converter.

SOLUTION: The control device of the permanent magnet type synchronous motor comprises: an input voltage detector 12; a voltage limit value operator 22; a voltage amplitude operator 21; a current command operation part 18; and current adjusters 20a, 20b. The current command operation part 18 comprises: a q-axis current command value operator 131 which operates a q-axis current command value from a torque command value; a magnetic flux adjuster 122 which operates a magnetic flux correction value by amplifying a difference between a voltage limit value and a voltage command value; an adder 124 which operates a second magnetic flux limit value by adding a first magnetic flux limit value and the magnetic flux correction value; a d-axis current limit value operator 132 which operates a d-axis current limit value from the second magnetic flux limit value and a q-axis current command; and an output limiter 133 which limits an upper limit value of the d-axis current command value by using the d-axis current limit value.

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