JPS6484465A - Rotary head device - Google Patents
Rotary head deviceInfo
- 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
Links
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.
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)
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. |
-
1987
- 1987-09-28 JP JP62240708A patent/JPS6484465A/en active Pending
Cited By (3)
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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