Magnetic part e.g. slot, detecting sensor for e.g. motor, has coils separated by air-gap in which flux generated at primary and captured at secondary of transformer is circulated, where presence of part in air-gap blocks circulation of flux

摘要

The sensor (1) has two coils (2, 3) respectively forming primary and secondary of a transformer. The coils are separated by an air-gap (4) in which a magnetic flux generated at the primary and captured at the secondary is circulated. The presence of the magnetic part in the air-gap blocks the circulation of the flux in the air-gap. A supply unit supplies a high frequency signal to the primary, and a measurement unit measures the amplitude of signal induced at the secondary by a signal applied to the primary. The coils are assembled on a magnetic circuit open to the air-gap.