| 摘要 |
<p>PURPOSE:To improve detectability for number of revolutions in a compressor by means of simple structure. CONSTITUTION:A compressor is constructed in such ways as burying a permanent magnet 20 in the outer circumference part of a movable member 8, bringing a rotational locus of a magnetic pole 20a of the permanent magnet 20 close to a fastener 14, generating a periodic change in a magnetic flux, which is generated from the permanent magnet 20 and transmits the fastener 14, detecting the change in the magnetic flux by a detector 18 installed in the vicinity of the outside part of the device in the fastener 14, and on the basis of the detected result, the number of revolutions of the compressor is detected, so that a high detection output can be obtained by simple structure.</p> |
