| 摘要 |
PROBLEM TO BE SOLVED: To provide a frequency converter which can control the rotational speed of an induction motor, using the induction motor small in outside dimension. SOLUTION: This is a frequency converter in which the rotor of a first induction motor 3 and the rotor of a second induction motor 6 are coupled with each other, and primary winding 4 and primary winding 7 are connected to a first power system 1, and secondary winding 5 is connected to a secondary power line 2, and secondary winding 8 is connected to a second power line through a power converter 9, and which gets the differential signal between the output signal from a power detector and the command value of power, and gets the speed differential signal between the output signal from the rotational speed detector 11 and the synchronous speed reference value, and outputs a control signal to the power converter, based on the differential signals of the power differential signal and the speed differential signal, and controls the secondary current of a second induction motor so as to control the rotational speed of a first induction motor. In this case, this is provided with a revolution conversion means 45 between the rotor of the first induction motor and the rotor of the second induction motor, and the rotor of the second induction motor 6 is rotated at high speed.
|
