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GB1330131A - Control means for electric motors operated from batteries - Google Patents

Control means for electric motors operated from batteries

Info

Publication number
GB1330131A
GB1330131A GB4672769A GB1330131DA GB1330131A GB 1330131 A GB1330131 A GB 1330131A GB 4672769 A GB4672769 A GB 4672769A GB 1330131D A GB1330131D A GB 1330131DA GB 1330131 A GB1330131 A GB 1330131A
Authority
GB
United Kingdom
Prior art keywords
signal
current
amplifier
motor
battery
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.)
Expired
Application number
GB4672769A
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.)
Cableform Ltd
Original Assignee
Cableform 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 Cableform Ltd filed Critical Cableform Ltd
Publication of GB1330131A publication Critical patent/GB1330131A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
    • H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements

Landscapes

  • Control Of Direct Current Motors (AREA)

Abstract

1330131 Control of D.C. motors CABLEFORM Ltd 16 Sept 1970 [23 Sept 1969 6 Feb 1970 7 Feb 1970 14 Feb 1970] 46727/69 5741/70 5990/70 and 7188/70 Heading H2J A series or shunt motor A is supplied from battery B through a thyristor switch S, while detector D provides a signal V1 representing the peak motor current, this signal being applied to an amplifier G which also receives a threshold signal VR corresponding to the current at which maximum design horse-power is reached. Until the signal V1 exceeds the signal VR, there is no output from the amplifier G so that the switch S is controlled entirely by a demand signal obtained from a control pedal. When the signal V1 exceeds the signal VR, the demand signal is modified by the output of amplifier G whereby the motor voltage decreases with increasing current. The degree of voltage reduction is determined by the gain of amplifier G which is set by adjustment of feedback H. Typical speed-current characteristics for shunt and series motors are described, Fig. 2 (not shown). A fuse FS in the battery circuit has a lower rating than the maximum motor current. Similar fuses may interconnect adjacent cells of the battery, Fig. 4 (not shown). A PTC thermistor TH responds to the temperature of the heat sink of the thyristors, the motor or other part to be protected. If the temperature exceeds a predetermined level, the demand signal is modified to reduce the current from the switch S. Alternatively, an output stage of the amplifier G contains the thermistor. If desired VR may be obtained from a plurality of thermistors sensing the temperature of various parts of the apparatus. Typical characteristics relating speed or duty cycle to current are discussed for a series motor, its supply battery and the thyristor switch operating at a constant recommended temperature, Fig. 3 (not shown).
GB4672769A 1969-09-23 1969-09-23 Control means for electric motors operated from batteries Expired GB1330131A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4672769 1969-09-23

Publications (1)

Publication Number Publication Date
GB1330131A true GB1330131A (en) 1973-09-12

Family

ID=10442365

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4672769A Expired GB1330131A (en) 1969-09-23 1969-09-23 Control means for electric motors operated from batteries

Country Status (2)

Country Link
GB (1) GB1330131A (en)
ZA (1) ZA706375B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458183A (en) * 1981-10-15 1984-07-03 The University Court Of The University Of Edinburgh DC Motor control
EP1873884A1 (en) * 2006-05-23 2008-01-02 Dr. Johannes Heidenhain GmbH Protective circuit for a converter
EP2395621A1 (en) * 1999-03-12 2011-12-14 Eaton Corporation Thermal compensation control for a motor starter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4458183A (en) * 1981-10-15 1984-07-03 The University Court Of The University Of Edinburgh DC Motor control
EP2395621A1 (en) * 1999-03-12 2011-12-14 Eaton Corporation Thermal compensation control for a motor starter
EP1873884A1 (en) * 2006-05-23 2008-01-02 Dr. Johannes Heidenhain GmbH Protective circuit for a converter
US7649724B2 (en) 2006-05-23 2010-01-19 Dr. Johannes Heidenhain Gmbh Protective circuit for a converter
CN101079541B (en) * 2006-05-23 2012-08-29 约翰尼斯海登海恩博士股份有限公司 Protection circuit for frequency converter

Also Published As

Publication number Publication date
ZA706375B (en) 1971-05-27

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee