SYNCHRONOUS MOTOR CONTROLLER AND COMPENSATION OF MAGNETIC FIELD POLARITY POSITION

摘要

PROBLEM TO BE SOLVED: To provide a synchronous motor controller to realize adequate control of the synchronous motor and provide a method of compensating magnetic field polarity position. SOLUTION: An induced voltage appearing on the terminal of a synchronous motor 105 is detected by driving a synchronous motor 105 at a predetermined velocity for adequately detecting the induced voltage of the synchronous motor 105, under the condition that a relay 104 is opened after compensating the magnetic field polarity position due to the control of CPU 101. Magnetic polarity detecting error (δ2) as a phase difference between the induced voltage and current phase compensation is obtained by subtraction between the induced voltage and current instruction after compensating current phase, to determine the final current phase compensation amount (γ+δ2) by a magnetic polarity detecting error (δ2) and a temporary compensation amount (γ) and a phase (ρ2) of a current to be applied with current phase compensation amount (γ+δ2) and temporary magnetic field polarity position (θ) in view of controlling synchronous motor with the second current instruction having the phase (ρ2) of current.