Abstract: Techniques are disclosed relating to sensing an object using an inductive proximity sensor. In an embodiment, an apparatus includes a transmission coil having turns formed on a first circuit board and including a first primary winding having a first winding direction. The apparatus further includes a first sensor coil having turns formed on a second circuit board and including a second primary winding having a second winding direction and a second sensor coil having turns formed on a third circuit board and including a third primary winding having a third winding direction opposite to the second winding direction. The coils are spaced apart from one another in a common axial direction and at least one of the coils includes a compensation winding having at least one turn, where the compensation winding is arranged radially outside of, and has a winding direction opposite to, the same coil's primary winding.

Abstract: Techniques are disclosed relating to sensing an object using an inductive proximity sensor. In an embodiment, an apparatus includes a transmission coil having turns formed on a first circuit board and including a first primary winding having a first winding direction. The apparatus further includes a first sensor coil having turns formed on a second circuit board and including a second primary winding having a second winding direction and a second sensor coil having turns formed on a third circuit board and including a third primary winding having a third winding direction opposite to the second winding direction. The coils are spaced apart from one another in a common axial direction and at least one of the coils includes a compensation winding having at least one turn, where the compensation winding is arranged radially outside of, and has a winding direction opposite to, the same coil's primary winding.

Abstract: Inductive proximity switch has a first transmitting coil (S1) and a first receiving coil (E1) of a receiving coil arrangement. The transmitting coil (S1) 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 (E1) of the receiving coil arrangement. The first coil E1 and a second coil (E2) 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 (E2) of the receiving coil arrangement and a compensating coil (S2) connected in series with the transmitting coil (S1), the pair of compensating coils being isolated from the eddy current field.

Abstract: Inductive proximity switch has a first transmitting coil (S1) and a first receiving coil (E1) of a receiving coil arrangement. The transmitting coil (S1) 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 (E1) of the receiving coil arrangement. The first coil E1 and a second coil (E2) 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 (E2) of the receiving coil arrangement and a compensating coil (S2) connected in series with the transmitting coil (S1), the pair of compensating coils being isolated from the eddy current field.