JPS54156115A - Excess current protector for dc motors - Google Patents

Excess current protector for dc motors

Info

Publication number
JPS54156115A
JPS54156115A JP6520878A JP6520878A JPS54156115A JP S54156115 A JPS54156115 A JP S54156115A JP 6520878 A JP6520878 A JP 6520878A JP 6520878 A JP6520878 A JP 6520878A JP S54156115 A JPS54156115 A JP S54156115A
Authority
JP
Japan
Prior art keywords
current
sent
voltage
motor
base
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
JP6520878A
Other languages
Japanese (ja)
Inventor
Hiroshi Mizuguchi
Shunichi Kawasaki
Yoshiyuki Furuya
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP6520878A priority Critical patent/JPS54156115A/en
Publication of JPS54156115A publication Critical patent/JPS54156115A/en
Pending legal-status Critical Current

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  • Control Of Direct Current Motors (AREA)

Abstract

PURPOSE: To carry out stable excess current protection by connecting an antipolar diode in parallel between the base and the emitter of a feed control transistor.
CONSTITUTION: When excess current is sent to the circuit of a DC motor 2 the voltage drop by a current detecting resistor 5 exceeds the forward voltage between the base and the emitter of a transistor Tr10 constituting a hook switch, collector current is sent to the Tr10, base current and collector current are sent to another Tr9 constituting a hook switch and the Tr9, Tr10 become continuous at the same time. Therefore the current sent from a positive feeder 1 does not pass a feed control Tr3 and the feed to the motor 2 stops. Then an AC signal appears at A-point by the operation of a governor switch 7 connected with the motor 2 but the inverse voltage is bypassed by a diode 15 and the charged voltage of a condenser 12 can be kept stable regardless of change of the supply voltage.
COPYRIGHT: (C)1979,JPO&Japio
JP6520878A 1978-05-30 1978-05-30 Excess current protector for dc motors Pending JPS54156115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6520878A JPS54156115A (en) 1978-05-30 1978-05-30 Excess current protector for dc motors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6520878A JPS54156115A (en) 1978-05-30 1978-05-30 Excess current protector for dc motors

Publications (1)

Publication Number Publication Date
JPS54156115A true JPS54156115A (en) 1979-12-08

Family

ID=13280257

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6520878A Pending JPS54156115A (en) 1978-05-30 1978-05-30 Excess current protector for dc motors

Country Status (1)

Country Link
JP (1) JPS54156115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750639U (en) * 1980-09-09 1982-03-23
JPS63191897U (en) * 1988-05-19 1988-12-09

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5750639U (en) * 1980-09-09 1982-03-23
JPS63191897U (en) * 1988-05-19 1988-12-09

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