JPS573587A - Controlling circuit for electric motor - Google Patents

Controlling circuit for electric motor

Info

Publication number
JPS573587A
JPS573587A JP7432580A JP7432580A JPS573587A JP S573587 A JPS573587 A JP S573587A JP 7432580 A JP7432580 A JP 7432580A JP 7432580 A JP7432580 A JP 7432580A JP S573587 A JPS573587 A JP S573587A
Authority
JP
Japan
Prior art keywords
voltage
fan
inverter
electrically
switch
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
JP7432580A
Other languages
Japanese (ja)
Inventor
Seiki Kikuchi
Hideaki Rokutan
Shoichi Kawamata
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 JP7432580A priority Critical patent/JPS573587A/en
Publication of JPS573587A publication Critical patent/JPS573587A/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
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/60—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors controlling combinations of dc and ac dynamo-electric motors

Abstract

PURPOSE:To reduce the number of revolutions of an electrically-driven cooling fan or stop the operation thereof while a battery fork lift is at a temporary rest and prevent said fan from producing noises, by controlling the voltage applied by an inverter which controls the drive of the electrically-driven cooling fan. CONSTITUTION:While the fork lift is traveling with a switch 14 on, a switch 7 is off, and also an PNP transistor 8 is off. Therefore, a voltage which is fed by a constant-voltage circuit 4 and dropped by a resistor 9 is applied to a terminal 13, and the output frequency or voltage from an inverter 5 to an electrically-driven cooling fan 6 rises by a portion corresponding to said voltage drop, so that the fan 6 rotates at high speed. On the other hand, while the lift is at rest, the switch 7 is on, and also the PNP transistor 8 is on. Therefore, the voltage applied to the terminal 13 is entirely what is fed from the constant-voltage circuit 4. Accordingly, the output frequency or voltage from the inverter 5 to the fan 6 drops by a voltage portion higher than the voltage applied through the resistor 9, so that the fan 6 is reduced in speed or stopped.
JP7432580A 1980-06-04 1980-06-04 Controlling circuit for electric motor Pending JPS573587A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7432580A JPS573587A (en) 1980-06-04 1980-06-04 Controlling circuit for electric motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7432580A JPS573587A (en) 1980-06-04 1980-06-04 Controlling circuit for electric motor

Publications (1)

Publication Number Publication Date
JPS573587A true JPS573587A (en) 1982-01-09

Family

ID=13543840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7432580A Pending JPS573587A (en) 1980-06-04 1980-06-04 Controlling circuit for electric motor

Country Status (1)

Country Link
JP (1) JPS573587A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095260A1 (en) * 2002-05-14 2003-11-20 Toyota Jidosha Kabushiki Kaisha Method and device for controlling fan for cooling vehicle-mounted battery

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5316812B2 (en) * 1974-08-21 1978-06-03

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5316812B2 (en) * 1974-08-21 1978-06-03

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003095260A1 (en) * 2002-05-14 2003-11-20 Toyota Jidosha Kabushiki Kaisha Method and device for controlling fan for cooling vehicle-mounted battery
US7348741B2 (en) 2002-05-14 2008-03-25 Toyota Jidosha Kabushiki Kaisha Method and device for controlling fan for cooling vehicle-mounted battery

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