JPS5681092A - Speed control circuit for dc motor - Google Patents

Speed control circuit for dc motor

Info

Publication number
JPS5681092A
JPS5681092A JP15437679A JP15437679A JPS5681092A JP S5681092 A JPS5681092 A JP S5681092A JP 15437679 A JP15437679 A JP 15437679A JP 15437679 A JP15437679 A JP 15437679A JP S5681092 A JPS5681092 A JP S5681092A
Authority
JP
Japan
Prior art keywords
motor
voltage
circuit
current mirror
mirror circuit
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
JP15437679A
Other languages
Japanese (ja)
Inventor
Yasuo Kominami
Yuichi Okubo
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 JP15437679A priority Critical patent/JPS5681092A/en
Publication of JPS5681092A publication Critical patent/JPS5681092A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
    • H02P7/2885—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE:To prevent the error due to the temperature change in the speed control circuit for the DC motor whose driving current is controlled by a current mirror circuit, by driving the current mirror circuit with the emitter follower of an NPN transistor. CONSTITUTION:A reference voltage is applied to one input of a voltage comparating circuit 12 constituted by transistors Q4, Q5, Q6, and Q7, and the output voltage of the current mirror circuit 16 is fedback to the other input thereof, thereby the counter-electromotive force of the DC motor 10 gets a constant voltage, and the motor is driven at a constant rotational speed. A transistor Q1 which drives the current mirror circuit 16 is driven by the emitter follower of the NPN transistor Q9 which responds to the output signal of the voltage comparing circuit 12. Since the NPN transistor Q9 has a high current amplification factor, the base current of Q1 becomes small, thereby the error due to the temperature change can be minimized.
JP15437679A 1979-11-30 1979-11-30 Speed control circuit for dc motor Pending JPS5681092A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15437679A JPS5681092A (en) 1979-11-30 1979-11-30 Speed control circuit for dc motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15437679A JPS5681092A (en) 1979-11-30 1979-11-30 Speed control circuit for dc motor

Publications (1)

Publication Number Publication Date
JPS5681092A true JPS5681092A (en) 1981-07-02

Family

ID=15582795

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15437679A Pending JPS5681092A (en) 1979-11-30 1979-11-30 Speed control circuit for dc motor

Country Status (1)

Country Link
JP (1) JPS5681092A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981300U (en) * 1982-11-19 1984-06-01 松下電器産業株式会社 DC motor speed control device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5469708A (en) * 1977-11-14 1979-06-05 Matsushita Electric Ind Co Ltd Speed controller for dc motor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5469708A (en) * 1977-11-14 1979-06-05 Matsushita Electric Ind Co Ltd Speed controller for dc motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5981300U (en) * 1982-11-19 1984-06-01 松下電器産業株式会社 DC motor speed control device

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