JPS6484465A - Rotary head device - Google Patents

Rotary head device

Info

Publication number
JPS6484465A
JPS6484465A JP62240708A JP24070887A JPS6484465A JP S6484465 A JPS6484465 A JP S6484465A JP 62240708 A JP62240708 A JP 62240708A JP 24070887 A JP24070887 A JP 24070887A JP S6484465 A JPS6484465 A JP S6484465A
Authority
JP
Japan
Prior art keywords
rotor magnet
addition
rotational
coil
signal
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
JP62240708A
Other languages
Japanese (ja)
Inventor
Saburo Kazama
Tomohito Yamashita
Masaharu Ono
Takayasu Ito
Shinji Ozaki
Seiichi Narishima
Hisafumi Sakimura
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 Ltd
Original Assignee
Hitachi Ltd
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 Ltd filed Critical Hitachi Ltd
Priority to JP62240708A priority Critical patent/JPS6484465A/en
Publication of JPS6484465A publication Critical patent/JPS6484465A/en
Pending legal-status Critical Current

Links

Landscapes

  • Brushless Motors (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

PURPOSE:To enhance position detecting precision and in addition, to stabilize rotational driving by moderating the leading edge and the trailing edge waveforms of the coil current waveform of a driving motor and in addition, using a coil counter electromotive force as a signal for current switching at the time of steady rotation. CONSTITUTION:At the time of a start, exciting coils 50a-50c are excited by the output of an oscillator 330 and a voltage corresponding to the rotational position of a rotary transformer 15 is generated in search coils 51a-51c and is made to be a position detect signal and a logic operation circuit 302, a control circuit 303 and a driver circuit 304 are made to operate so as to start the motor. After the start is set up, an electromotive force generated in sensor coils 121a-121c provided in the pole-face magnet field of a rotor magnet 18 by the rotation of said rotor magnet is used as the position signal of the rotor magnet 18. By such a constitution, a rotational repulsing force caused by a rotor magnet magnetic field received by a stator coil 21 is released and in addition, the energizing current waveform of the stator 21 is kept stable.
JP62240708A 1987-09-28 1987-09-28 Rotary head device Pending JPS6484465A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62240708A JPS6484465A (en) 1987-09-28 1987-09-28 Rotary head device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62240708A JPS6484465A (en) 1987-09-28 1987-09-28 Rotary head device

Publications (1)

Publication Number Publication Date
JPS6484465A true JPS6484465A (en) 1989-03-29

Family

ID=17063527

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62240708A Pending JPS6484465A (en) 1987-09-28 1987-09-28 Rotary head device

Country Status (1)

Country Link
JP (1) JPS6484465A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120679U (en) * 1990-03-24 1991-12-11
TR25270A (en) * 1990-06-07 1993-01-01 Sandoz Ltd REPLACED Phthalates and Heterocyclic Phthalides
TR27247A (en) * 1991-09-20 1994-12-21 Thomson Brandt Gmbh Moving phase detector recorder.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03120679U (en) * 1990-03-24 1991-12-11
TR25270A (en) * 1990-06-07 1993-01-01 Sandoz Ltd REPLACED Phthalates and Heterocyclic Phthalides
TR27247A (en) * 1991-09-20 1994-12-21 Thomson Brandt Gmbh Moving phase detector recorder.

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