JPS5472415A - Controlling system of brush-less direct current drum motor - Google Patents
Controlling system of brush-less direct current drum motorInfo
- Publication number
- JPS5472415A JPS5472415A JP13918077A JP13918077A JPS5472415A JP S5472415 A JPS5472415 A JP S5472415A JP 13918077 A JP13918077 A JP 13918077A JP 13918077 A JP13918077 A JP 13918077A JP S5472415 A JPS5472415 A JP S5472415A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- synchronizing signal
- motor
- standard synchronizing
- brush
- 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
- Control Of Electric Motors In General (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
PURPOSE: To control a rotation of a motor stably by changing over to an internal standard synchronizing signal included in a VTR and controlling when a video input signal or an external standard synchronizing signal becomes not to be supplied.
CONSTITUTION: When a motor driving amplifier 5 is controlled through an error voltage additioner 13 by suppliing a speed detecting signal of a brush-less direct current drum motor 20 used on a VTR etc. in parallel to a frequency discriminator 8 and a phase error detecting circuit 11, an internal standard synchronizing signal generating circuit 21 constituted with a quartz oscillator and a digital counter and a signal selecting circuit 25 to operate by an output of an external standard signal level detector 23 are added. Accordingly when an external standard synchronizing signal becomes to a non signal by whatever causes, a change over is made to an internal standard synchronizing signal, therefore a motor 20 is rotated stably and normal recording and regenerating can be performed.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13918077A JPS5472415A (en) | 1977-11-18 | 1977-11-18 | Controlling system of brush-less direct current drum motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13918077A JPS5472415A (en) | 1977-11-18 | 1977-11-18 | Controlling system of brush-less direct current drum motor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5472415A true JPS5472415A (en) | 1979-06-09 |
Family
ID=15239417
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13918077A Pending JPS5472415A (en) | 1977-11-18 | 1977-11-18 | Controlling system of brush-less direct current drum motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5472415A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5033378A (en) * | 1973-07-30 | 1975-03-31 |
-
1977
- 1977-11-18 JP JP13918077A patent/JPS5472415A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5033378A (en) * | 1973-07-30 | 1975-03-31 |
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