JPS564057A - Speed generator - Google Patents
Speed generatorInfo
- Publication number
- JPS564057A JPS564057A JP7989779A JP7989779A JPS564057A JP S564057 A JPS564057 A JP S564057A JP 7989779 A JP7989779 A JP 7989779A JP 7989779 A JP7989779 A JP 7989779A JP S564057 A JPS564057 A JP S564057A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic material
- projections
- magnet
- output
- hall devices
- 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.)
- Granted
Links
Landscapes
- Linear Or Angular Velocity Measurement And Their Indicating Devices (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
PURPOSE: To miniaturize and simplify the construction of a speed generator as a whole by utilizing a part of the generator as a motor body as well.
CONSTITUTION: Hall devices 1W3 are fixed to a stator, and a field magnet 5 and a soft magnetic material 6 are fixedly mounted on a rotary shaft 7. The magnetic material 6 has projections of a constant pitch at an outer circumferential portion thereof. When the magnetic material 6 with the magnet 5 is rotated, the projections mentioned above and recesses defined thereby are opposed alternately to the Hall devices. Every time the polarity of the magnet 5 is changed in accordance with variations in an angle of rotation θ of the rotor, an output is generated in terminals 1A, 1B of the Hall device 1 alternately. An output is generated in the same manner in terminals of the Hall devices 2, 3. When these outputs are added up, a basic wave component and a modulated wave component due to the projections and recesses at the outer circumferential portion of the magnetic material 6 are put together. The resulting output is processed through HPF 8 to stably obtain an AC wave signal proportional to the number of revolutions of the rotor.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54079897A JPS602622B2 (en) | 1979-06-22 | 1979-06-22 | speed generator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP54079897A JPS602622B2 (en) | 1979-06-22 | 1979-06-22 | speed generator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS564057A true JPS564057A (en) | 1981-01-16 |
JPS602622B2 JPS602622B2 (en) | 1985-01-23 |
Family
ID=13703059
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP54079897A Expired JPS602622B2 (en) | 1979-06-22 | 1979-06-22 | speed generator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS602622B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58118055A (en) * | 1981-12-30 | 1983-07-13 | Sony Corp | Rotary driver |
JPS58175459U (en) * | 1982-05-19 | 1983-11-24 | パイオニア株式会社 | Rotation speed detection device for DC brushless motor |
-
1979
- 1979-06-22 JP JP54079897A patent/JPS602622B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58118055A (en) * | 1981-12-30 | 1983-07-13 | Sony Corp | Rotary driver |
JPH0446075B2 (en) * | 1981-12-30 | 1992-07-28 | Sony Corp | |
JPS58175459U (en) * | 1982-05-19 | 1983-11-24 | パイオニア株式会社 | Rotation speed detection device for DC brushless motor |
Also Published As
Publication number | Publication date |
---|---|
JPS602622B2 (en) | 1985-01-23 |
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