| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a controller of an AC motor system which performs terminal constant-voltage control in a simple method. <P>SOLUTION: In the controller of the AC motor system which performs conversion between a direct current and an alternating current by a power conversion device to apply the alternating current to a motor, and finds a composite current command of an excitation current command and a torque current command to perform firing angle control over the power conversion device, excitation current command means of giving the excitation current command includes function generation means of inputting a rotating speed and outputting the excitation current command so as to perform weak field control over the motor, and the function generation means gives a first excitation current command when the rotating speed of the motor is a firsts rotating speed and a second excitation current command when the rotating speed is a second rotating speed, and supplies the excitation current command as a complementary value when the rotating speed is another rotating speed, the first excitation current command when the rotating speed is the first rotating speed and the second excitation current command when the rotating speed is the second rotating speed being such values that it is verified that the motor terminal voltage is made constant through operation using the values. <P>COPYRIGHT: (C)2012,JPO&INPIT |
