| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an inverter device capable of precisely estimating an input current. <P>SOLUTION: A current flowing an AC motor 5 is detected by a shunt resistor 63. A motor control part 40, PWM-controls switching elements Q1-Q6 provided to a current path of the AC motor 5 so that an excitation component current and a torque component current at the AC motor 5 which are obtained from the current detected with the shunt resistor 63 come to be target values by means of a uvw/dq conversion part 41, a position/speed estimating part 42, a subtractor 43, a speed control part 44, subtractors 45 and 46, a current control part 47, and a dq/uvw conversion part 48. An input current calculation part 49 estimates an input current from the current flowing the AC motor 5 which is detected with the shunt resistor 63 and a PWM control duty ratio of the switching elements Q1-Q6. <P>COPYRIGHT: (C)2011,JPO&INPIT |
