| 摘要 |
PURPOSE:To enable highly accurate high speed vector control by a method wherein variation of secondary resistance is compensated for over the entire operating region and the interference between exciting component current and torque component current is compensated for whereby the amplitude of basic wave in a pulse width modulated waveform is maintained constant with respect to a command value regardless of the variation of DC voltage. CONSTITUTION:A coordinates conversion circuit 21 produces an exciting component current signal i1delta and a torque component current signal i1delta. An adder 19 produces a delta axis component command signal V1delta* through a delta axis component command circuit 16 and a delta axis non-interfering circuit 23. An adder 18 produces a gamma axis command signal V1gamma* through a gamma axis component command circuit 17 and a gammaaxis non-interfering circuit 22. A coordinates converting circuit 20 produces three-phase command signals Vu*-Vw*. A DC voltage detecting circuit 4 and a reference triangular wave generating circuit 10 produce a reference triangular wave Vp having constant basic wave amplitude. A comparator 12 produces a PWM signal and drives an induction motor 8 through an inverter drive circuit 11 and an inverter 5. By such arrangement, highly accurate high speed vector control is realized. |
