| 摘要 |
Inductive proximity switch has a first transmitting coil (S 1 ) and a first receiving coil (E 1 ) of a receiving coil arrangement. The transmitting coil (S 1 ) transmits an exciting field inducing eddy currents in a metallic trip ( 1 ) brought into the vicinity of the proximity switch. The eddy currents generate a voltage-inducing eddy current field in the first coil (E 1 ) of the receiving coil arrangement. The first coil E 1 and a second coil (E 2 ) of the receiving coil arrangement are disposed and connected so that the exciting field generates a differential voltage ( 3 ), in the receiving coil arrangement. A pair of compensating coils includes the second coil (E 2 ) of the receiving coil arrangement and a compensating coil (S 2 ) connected in series with the transmitting coil (S 1 ), the pair of compensating coils being isolated from the eddy current field.
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