JPS6412887A - Speed control device of dc motor - Google Patents
Speed control device of dc motorInfo
- Publication number
- JPS6412887A JPS6412887A JP62167255A JP16725587A JPS6412887A JP S6412887 A JPS6412887 A JP S6412887A JP 62167255 A JP62167255 A JP 62167255A JP 16725587 A JP16725587 A JP 16725587A JP S6412887 A JPS6412887 A JP S6412887A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- voltage
- resistance
- equivalent
- switched
- 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.)
- Granted
Links
Landscapes
- Control Of Direct Current Motors (AREA)
Abstract
PURPOSE:To prevent the deterioration of load resistant characteristic even if an engine speed is switched by switching the value of resistance to a shunt circuit and the value of voltage dividing resistance simultaneously in the case of switching of the engine speed. CONSTITUTION:A detection terminal 2 detecting the equivalent voltage of a base terminal 1 and the counter electromotive force is provided to an IC 2 for the speed control of a DC motor. And, an error detecting circuit 2a outputs a signal equivalent to a voltage obtained in such a way that a voltage equivalent to the difference between a voltage equivalent to the speed of the DC motor M and the reference voltage is divided by voltage dividing resistors Ra and Rb. Accordingly, a shunt transistor Q1 and the driving transistors Q2-Qn are controlled, and the current It applied to the resistance Rt1 & Rt2 and the current Ia applied to the DC motor M are controlled. An engine speed of the DC motor M is switched by operation of a switch S1. Simultaneously, the resistance Rt1, Rt2 and Rt3 are switched to prevent the deterioration of load resistant characteristic.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167255A JPH084391B2 (en) | 1987-07-03 | 1987-07-03 | DC motor speed control device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167255A JPH084391B2 (en) | 1987-07-03 | 1987-07-03 | DC motor speed control device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6412887A true JPS6412887A (en) | 1989-01-17 |
JPH084391B2 JPH084391B2 (en) | 1996-01-17 |
Family
ID=15846342
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62167255A Expired - Lifetime JPH084391B2 (en) | 1987-07-03 | 1987-07-03 | DC motor speed control device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH084391B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5298979A (en) * | 1990-12-31 | 1994-03-29 | Samsung Electronics Co., Ltd. | Automatic digital white-balancing circuit utilizing memory addresses to determine where white-balance correction is necessary |
US5325183A (en) * | 1992-02-29 | 1994-06-28 | Samsung Co., Ltd. | OSD circuit for displaying advertising picture data |
-
1987
- 1987-07-03 JP JP62167255A patent/JPH084391B2/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5298979A (en) * | 1990-12-31 | 1994-03-29 | Samsung Electronics Co., Ltd. | Automatic digital white-balancing circuit utilizing memory addresses to determine where white-balance correction is necessary |
US5325183A (en) * | 1992-02-29 | 1994-06-28 | Samsung Co., Ltd. | OSD circuit for displaying advertising picture data |
Also Published As
Publication number | Publication date |
---|---|
JPH084391B2 (en) | 1996-01-17 |
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