Title:
ROTARY ENCODER RESPONSIVE TO BATTERY LOSS AND SERVO CONTROL DEVICE USING SAME
Document Type and Number:
WIPO Patent Application WO/2022/003761
Kind Code:
A1
Abstract:
Provided is a rotary encoder that has a function for responding to battery loss, has high performance, and is compact and inexpensive. This rotary encoder comprises an MR sensor unit, a battery loss response unit that generates power and stores information about the rotation angle of a rotary shaft to non-volatile memory when power from the main battery of a motor is lost, and an encoder output control unit for processing the output of the MR sensor unit and the output of the battery loss response unit according to preset conditions and outputting the result of the processing. The MR sensor unit comprises an MR sensor that is provided on a substrate at a position opposing a small flat magnet fixed to the rotary shaft. The battery loss response unit comprises an angle information processing unit and a large Barkhausen effect power generation module that is disposed on the substrate behind the MR sensor. The angle information processing unit has a function for generating and recording information relating to multiple rotations of the rotary shaft when the power is lost according to initially set conditions that include a recording period length.
Inventors:
TADA JUNICHI (JP)
Application Number:
PCT/JP2020/025478
Publication Date:
January 06, 2022
Filing Date:
June 29, 2020
Export Citation:
Assignee:
IGARASHI ELECTRIC WORKS LTD (JP)
International Classes:
G01D5/245; G01D5/244; H02K29/08; H02P6/16
Foreign References:
| US20150130450A1 | 2015-05-14 | |||
| US20170253267A1 | 2017-09-07 | |||
| JPH01223310A | 1989-09-06 |
Attorney, Agent or Firm:
TAKEZAWA Soichi et al. (JP)
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