| 摘要 |
PURPOSE:To enable accurate diagnosis, by displaying the phase non-equilibrium ratio and amplitude non-equilibrium ratio of the stator coil of a three-phase electromotor and the ratio of the power spectrum intensity of the primary current of the electromotor in the beat frequency and power source frequency of a rotor coil. CONSTITUTION:The primary radio waves of the first and third phases of a three-phase induction electromotor 1 are detected by current transformers 2, 3 and the number of rotations of said electromotor 1 are detected by a pulse generator 6. Signals of input terminals 4, 5, 7 are converted by A/D converters 8, 9, 10. A central processing unit 12 collects respective wave form data outputted from the A/D converters 8, 9, 10 to store the same in memory 13 to perform various operations and calculates data for performing the diagnosis (detection of layer short, disconnection and slackening) of a stator coil and the diagnosis (detection of layer short, disconnection and slackness) of a rotor coil and displays the same on display devices. |
