Patent ID: 11946777
Assignee: AKEBONO BRAKE INDUSTRY CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A position detection device comprising
a position sensor including a coil and a magnetic core that is movable inside the coil; and
a signal processor configured to output a signal corresponding to a change in a relative position between the coil and the magnetic core, wherein
the signal processor is configured
to generate a rectangular wave voltage applied to the coil,
to convert a current which flow through the coil by the rectangular wave voltage into a voltage and to output the voltage, and
to acquire a voltage measurement value Vs obtained by sampling the output voltage after predetermined time Td in synchronization with a timing t0 of rising or falling of a waveform of the rectangular wave voltage, and

the predetermined time Td is set such that the voltage measurement value Vs is restricted within a range of 40% or more and 99.999% or less with respect to a maximum value of the rectangular wave voltage when the magnetic core is at a position where an inductance of the coil is minimum.