JPS6412887A - Speed control device of dc motor - Google Patents

Speed control device of dc motor

Info

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
Application number
JP62167255A
Other languages
Japanese (ja)
Other versions
JPH084391B2 (en
Inventor
Hidekazu Ishii
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP62167255A priority Critical patent/JPH084391B2/en
Publication of JPS6412887A publication Critical patent/JPS6412887A/en
Publication of JPH084391B2 publication Critical patent/JPH084391B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.
JP62167255A 1987-07-03 1987-07-03 DC motor speed control device Expired - Lifetime JPH084391B2 (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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