Patent ID: 8704475

Claim:
A current source inverter device, characterized in that: the current source inverter device comprises: a current source inverter that converts direct-current power into alternating-current power; a motor that is supplied with alternating-current power from the current source inverter; and a control means that controls the current source inverter with no magnetic pole position sensor by: sensing a terminal voltage of the motor; calculating an internal induced voltage of the motor on a basis of the sensed terminal voltage, a motor current flowing through a coil of the motor, and a coil impedance of the motor; converting the terminal voltage into magnetic pole position information by integrating the terminal voltage; and generating a current having a conduction pattern synchronized with the internal induced voltage; and the control means: calculates a phase difference θc of the terminal voltage with respect to the motor current, wherein the phase difference θc is expressed as a function containing a voltage value and a current value of a direct-current side of the current source inverter; calculates a phase difference θv of the terminal voltage with respect to the internal induced voltage, wherein the phase difference θv is expressed as a function containing a value of a phase difference θx of the motor current with respect to the internal induced voltage, a value of the coil impedance of the motor, and a value of the motor current; and determines an adjusting angle θα by using a conditional equation of θα=θv−θy−θc, wherein the adjusting angle θα is an error in the phase difference θx of the motor current with respect to the internal induced voltage wherein θy represents a setpoint of the phase difference θx.