Multirotation type encoder

Details Multirotation type encoder Multirotation type encoder

2006-05-09

2006-05-09

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

Displacement

Reexamination Certificate

active

07042211

ABSTRACT:
A multirotation type encoder of the invention includes a first encoder20attached to a rotating shaft11of a rotating machine10for detecting an absolute value rotational angle within one rotation, and a second encoder for counting a multirotation amount of the rotating shaft11by using a speed reducing mechanism30by magnetic coupling and the second encoder40is constituted by a first magnetic gear31directly connected to the rotating shaft and magnetized in multiple poles and at least one second magnetic gear32arranged to be opposed thereto in noncontact and magnetized in multiple poles by a number of magnetic poles larger than that of the first magnetic gear31and is constituted to count a multirotation amount by detecting a rotational angle of the second magnetic gear by the second encoder.

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