JPS5472415A - Controlling system of brush-less direct current drum motor - Google Patents

Controlling system of brush-less direct current drum motor

Info

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
Application number
JP13918077A
Other languages
Japanese (ja)
Inventor
Masao Ishikura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Denshi KK
Original Assignee
Hitachi Denshi KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Denshi KK filed Critical Hitachi Denshi KK
Priority to JP13918077A priority Critical patent/JPS5472415A/en
Publication of JPS5472415A publication Critical patent/JPS5472415A/en
Pending legal-status Critical Current

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
JP13918077A 1977-11-18 1977-11-18 Controlling system of brush-less direct current drum motor Pending JPS5472415A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033378A (en) * 1973-07-30 1975-03-31

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5033378A (en) * 1973-07-30 1975-03-31

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