| 摘要 |
PURPOSE:To perform a controlling method for a synchronous motor capable of controlling the effective and reactive powers from a power source to arbitrary values by simultaneously controlling the firing phase angles of a converter and an inverter in response to the load state of the motor. CONSTITUTION:An effective current command value I*P is obtained by a multiplier ML from a torque command T* and a command value omega through a control compensating circuit HN(S) and a limiter LIM from the deviation epsilonN between a speed command value omega* and a speed detected value omega. A reactive current command value I*Q is obtained through a control compensator HQ(S) from the deviation epsilonQ between the reactive power set value Q* and the reactive power detected value Q from a reactive power calculator VAR. (I*Q)<2>, (I*P)<2> are respectively calculated by square calculators SQ1, SQ2, are added by an adder A1, and the DC current command value I*0 is obtained by a square root calculator SQR. DC voltage command value V*0 is obtained from I*P and I*0 through a divider DIV and an operational amplifier KV, and the firing phase angles of the converters SS1, SS2 are controlled on the basis of the command value V*0 and the current deviation epsilon0. |
