JPS6488957A - Index position detecting device - Google Patents
Index position detecting deviceInfo
- Publication number
- JPS6488957A JPS6488957A JP24545987A JP24545987A JPS6488957A JP S6488957 A JPS6488957 A JP S6488957A JP 24545987 A JP24545987 A JP 24545987A JP 24545987 A JP24545987 A JP 24545987A JP S6488957 A JPS6488957 A JP S6488957A
- Authority
- JP
- Japan
- Prior art keywords
- index
- detecting
- signal
- magnet
- permanent magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Rotational Drive Of Disk (AREA)
Abstract
PURPOSE:To simplify composition and to improve profitability by providing an index magnetized to opposite magnetism at one part of a permanent magnet for the field system of a rotor, logic-processing the output of the magnetoelectric converting element for detecting the magnetic field of the permanent magnet and generating an index signal. CONSTITUTION:To one of permanent magnets 22 for the field system of a rotor 21, a magnet 23 for detecting the index which is magnetized the part thereof to the opposite magnetism, is provided, and it is detected by an element HG11 in the Hall element of fixed magnetoelectric converting elements for detecting the magnetic field HG11-HG13 for detecting the magnet 22. Triggering is executed by this detecting signal, and a window signal WD is outputted from a monostable multivibrator 31, the detecting signal to pass through an inverter and an AND circuit 33 are AND-processed, and an H signal from the circuit 33 becomes an index position detecting signal. Thus, the exclusive-use Hall element to magnetize the index to the external side of the permanent magnet for the field system and to detect the index can be eliminat ed, the constitution can be simplified, and the profitability of an index detecting device can be increased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24545987A JPS6488957A (en) | 1987-09-29 | 1987-09-29 | Index position detecting device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP24545987A JPS6488957A (en) | 1987-09-29 | 1987-09-29 | Index position detecting device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6488957A true JPS6488957A (en) | 1989-04-03 |
Family
ID=17133976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP24545987A Pending JPS6488957A (en) | 1987-09-29 | 1987-09-29 | Index position detecting device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6488957A (en) |
-
1987
- 1987-09-29 JP JP24545987A patent/JPS6488957A/en active Pending
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