Internal short-circuit measurement circuit of the coil

Published:2011/9/2 3:17:00 Author:Christina | Keyword: Internal short-circuit, measurement circuit, coil | From:SeekIC

When the stator coil of the electromotor is in the local short-circuit state, you can not measure it by using the multimeter. The test circuit in the figure can complete the short-circuit test of the coil. The capacitive three-point oscillator circuit is composed of the transistor VT, the inductance coil L and the capacitors C1 and C2. When the measured stator coil is connected with the A and B of the oscillation circuit, the measured stator coil has the high-impedance if there is no short-circuit fault, it will not influence the operation of the oscillator, the pointer of the milliammeter has no action. When the measured stator coil has short-circuit fault, When it is connected with the A and B of the oscillation circuit, the Q value of the oscillation loop will reduce.



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