| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an AC motor driving system suitable for a plurality of AC motors, mutually connecting output shafts of the AC motors, and driving a single load. <P>SOLUTION: An activation instruction and a speed instruction are applied to an upper level controller 11. The upper level controller 11 reads a rotor speed estimation ω<SB>R</SB><SP>#</SP>of an induction motor 3 at a predetermined elapsed time in accordance with the instructions while motor controllers 2, 4, 6 operate in a rotation mode, and compares the rotor speed estimation ω<SB>R</SB><SP>#</SP>with a speed instruction value ω<SP>*</SP>. If a difference between them exceeds a predetermined value, it determines that the motor controller 2 and the induction motor 3 abnormally operate, a gate blocking instruction is issued to a PWM inverter 24, the induction motor 3 freely runs once by blocking an output from the PWM inverter 24, and the motor controller 2 and the induction motor 3 restart by issuing a restart instruction to the motor controller 2. The problem that the total AC motor driving system becomes inoperative due to an increase in the difference is overcome. <P>COPYRIGHT: (C)2007,JPO&INPIT |
