| 摘要 |
PROBLEM TO BE SOLVED: To realize stable and highly accurate speed control in a speed control system of the inverter of a guided motor based on instant speed calculation by a first speed computing element, a second speed computing element and a third speed computing element. SOLUTION: This inverter controller is provided with a current comparator 15 to compare the absolute value of primary current of a current detector 5 with a set threshold, a speed switching device 13 to switch speed information to be fed back to a speed controller 10 and a first secondary magnetic flux computing element according to a state of a variable of the current comparator 15, the third speed computing element to calculate rotation speed of the guided motor 2 from a torque command value of the speed controller 10 and computing the speed of the speed switching device 13 and a filter circuit 19 to smoothly switch the speed information. |
