| 摘要 |
PURPOSE:To eliminate the influence of main flux facilitating the detection of signals with smaller oscillating flux by a method wherein a search coil stator for measuring flux is fixed deflected positions to be connected in the reverse phase concelling the main flux for connecting to an arithmetic unit. CONSTITUTION:The search coils 3, 4 for measuring flux are fixed to motor stator at deflected positions by pi radiant of electrical angle with conductive bars 6 buried in a rotor 5. Said search coils 3, 4 are connected in reverse phase concelling the main flux to input the power into an arithmetic unit 7. The coils 3, 4 are wound around a block 2a of laminated into core 1 through vent ducts 8 between slot bottom and periphery of stator 2 to be fixed. Through these prosedures, any defect such as the conductive bar cut etc. may be detected earlier. |
