DRIVING DEVICE AND ITS CONTROL METHOD

PROBLEM TO BE SOLVED: To make it difficult to generate a trouble and to simplify maintenance work by preparing a first AC motor whose driving shaft is connected to an object to be driven and a second AC motor whose driving shaft is connected to the output shaft of the first AC motor via no clutch mechanism which inter mittently transmits torque. SOLUTION: A driving device of a recoiler 2 is provided with a first AC motor 4 whose output shaft is connected to a coil F1 made of an aluminum material F and a second AC motor 6 whose output shaft is connected to the output shaft of the first AC motor 4 via a coupling 5. On the other hand, the driving device of the recoiler is provided with a first AC motor 7 which is connected to the output shaft of the first AC motor 7 and a second AC motor 9 whose output shaft is connected to the output shaft of the first AC motor 7 and a second AC motor 9 whose output shaft is connected to the output shaft of the first AC motor 7 via a coupling 8. Since the AC type motor is used as the motor for the driving device, two motors are provided in a state that their output shafts are directly connected each other, and whereby a clutch mechanism between the motors is omitted.