JPS55153153A - Magnetic recording and reproducing device - Google Patents
Magnetic recording and reproducing deviceInfo
- Publication number
- JPS55153153A JPS55153153A JP6183779A JP6183779A JPS55153153A JP S55153153 A JPS55153153 A JP S55153153A JP 6183779 A JP6183779 A JP 6183779A JP 6183779 A JP6183779 A JP 6183779A JP S55153153 A JPS55153153 A JP S55153153A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- rotational frequency
- torque
- magnet
- eddy current
- 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
- Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
Abstract
PURPOSE: To make it possible to obtain large reel turntable torque with variations in rotational frequency of a driving source by composing a rotation transmission mechanism of a magnet and a body of revolution generating an eddy current loss and by specifying the number of poles of the magnet.
CONSTITUTION: As a difference in rotational frequency between motors 3 and wheel 7 is gradually increased by increasing a voltage supplied to the motor 3, an eddy current is generated depending upon a difference in rotational frequency between disk 8 and magnet 5 and the torque of this eddy current increases in proportion to the difference in rotational frequency. In fast traversing or rewinding mode, a high voltage is applied to motor 3 to increase the rotational frequency. In reproduction, on the other hand, the voltage applied to motor 3 is decreased. At this time, although motor 3 has cogging, a transmission mechanism by the eddy current nearly eliminates a ripple of torque generated by motor 3. In this device, although magnet 5 gives effect to magnetization with 4W10 poles, the largest torque can be extracted and a circular disk can lower the rotational frequency of motor 3 to suppress dispersion in torque.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6183779A JPS55153153A (en) | 1979-05-18 | 1979-05-18 | Magnetic recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6183779A JPS55153153A (en) | 1979-05-18 | 1979-05-18 | Magnetic recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55153153A true JPS55153153A (en) | 1980-11-28 |
Family
ID=13182599
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6183779A Pending JPS55153153A (en) | 1979-05-18 | 1979-05-18 | Magnetic recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55153153A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5880155A (en) * | 1981-11-06 | 1983-05-14 | Hitachi Ltd | Magnetic recording and reproducing device |
-
1979
- 1979-05-18 JP JP6183779A patent/JPS55153153A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5880155A (en) * | 1981-11-06 | 1983-05-14 | Hitachi Ltd | Magnetic recording and reproducing device |
JPS6240774B2 (en) * | 1981-11-06 | 1987-08-31 | Hitachi Ltd |
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