GB1508505A - Method and circuit for operating an electrical machine - Google Patents

Method and circuit for operating an electrical machine

Info

Publication number
GB1508505A
GB1508505A GB2609875A GB2609875A GB1508505A GB 1508505 A GB1508505 A GB 1508505A GB 2609875 A GB2609875 A GB 2609875A GB 2609875 A GB2609875 A GB 2609875A GB 1508505 A GB1508505 A GB 1508505A
Authority
GB
United Kingdom
Prior art keywords
temperature
rotor
current
value
limiting
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
GB2609875A
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.)
BBC Brown Boveri AG Germany
BBC Brown Boveri France SA
Original Assignee
Brown Boveri und Cie AG Germany
BBC Brown Boveri France SA
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 Brown Boveri und Cie AG Germany, BBC Brown Boveri France SA filed Critical Brown Boveri und Cie AG Germany
Publication of GB1508505A publication Critical patent/GB1508505A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H02H7/085—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 against excessive load
    • H02H7/0856—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 against excessive load characterised by the protection measure taken
    • H02H7/0859—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 against excessive load characterised by the protection measure taken avoiding restarting after fault condition has disappeared
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H6/00—Emergency protective circuit arrangements responsive to undesired changes from normal non-electric working conditions using simulators of the apparatus being protected, e.g. using thermal images

Abstract

1508505 Automatic control systems BROWN BOVERI & CIE AG 19 June 1975 [1 July 1974] 26098/75 Heading G3R A temperature-limiting arrangement for an electric motor is based on the principle of limiting the current in accordance with a simulated rotor temperature. The rotor current is sensed at 2, squared at 3 and integrated at 4 to provide #i<SP>2</SP>dt as an indicator of the heat input to the rotor. A resistive device 5, simulating the heat loss to the surroundings, then converts the #i<SP>2</SP>dt value to a presumed rotor temperature output 58. This is compared at 8 with a set 'safe' temperature 7 and, if the two temperature values become equal, a fixedcurrent determining subsystem 9,10 over-rides the normal (speed) control 11. To correct for variations in ambient temperature, a measured temperature value 64 - from a transducer associated with the motor casing - may modify the action of the simulator 4, 5.
GB2609875A 1974-07-01 1975-06-19 Method and circuit for operating an electrical machine Expired GB1508505A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742431540 DE2431540C2 (en) 1974-07-01 1974-07-01 Circuit arrangement for protecting an electrical machine against excessive heating with a simulation device

Publications (1)

Publication Number Publication Date
GB1508505A true GB1508505A (en) 1978-04-26

Family

ID=5919403

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2609875A Expired GB1508505A (en) 1974-07-01 1975-06-19 Method and circuit for operating an electrical machine

Country Status (9)

Country Link
AT (1) AT338364B (en)
BE (1) BE830861A (en)
CH (1) CH591775A5 (en)
DE (1) DE2431540C2 (en)
FR (1) FR2277513A7 (en)
GB (1) GB1508505A (en)
IT (1) IT1040771B (en)
NL (1) NL7507740A (en)
SE (1) SE404280B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006065337A1 (en) * 2004-12-13 2006-06-22 Caterpillar Inc. Overload protection system for an electrical device
US8319465B2 (en) 2007-03-19 2012-11-27 Siemens Aktiengesellschaft Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847765C2 (en) * 1978-11-03 1984-02-16 Kaltenbach & Voigt Gmbh & Co, 7950 Biberach Circuit arrangement for protecting a drive motor from overload, in particular for a dental device
DE3046860A1 (en) * 1980-12-12 1982-07-15 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Optical heat sensitive monitor circuit - has heat sensitive element coupled to relay to extend control and monitoring facilities
DE3203682A1 (en) * 1982-02-04 1983-08-11 Brown, Boveri & Cie Ag, 6800 Mannheim DRIVE SYSTEM FOR VEHICLES WITH A DC GENERATOR
DE3311771A1 (en) * 1983-03-31 1984-10-04 Vorwerk & Co Interholding Gmbh, 5600 Wuppertal MONITORING CIRCUIT FOR ELECTRIC MOTORS
DE3519472A1 (en) * 1984-07-03 1986-01-16 Keiper Recaro GmbH & Co, 5630 Remscheid Protection circuit
US4550277A (en) * 1984-09-24 1985-10-29 Black & Decker Inc. Overload detection and warning system for electric motors in power tools and the like
DE3638946A1 (en) * 1986-11-14 1988-05-26 Bbc Brown Boveri & Cie METHOD FOR PROTECTING THE ELECTRIC DRIVE OF A VEHICLE AGAINST OVERLOAD
FR2685986B1 (en) * 1992-01-03 1994-06-24 Valeo Electronique METHOD AND DEVICE FOR THERMAL CONTROL OF AN ELECTRIC MOTOR ON BOARD ON VEHICLE AND APPLICATION TO A POWER STEERING SYSTEM.

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1255184B (en) * 1962-05-19 1967-11-30 Siemens Ag Method and device for regulating the feed rate of a feed device driven by an electric motor as a function of the load on the drive motor of the associated working machine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006065337A1 (en) * 2004-12-13 2006-06-22 Caterpillar Inc. Overload protection system for an electrical device
US7307396B2 (en) 2004-12-13 2007-12-11 Caterpillar Inc. Overload protection system for an electrical device
US8319465B2 (en) 2007-03-19 2012-11-27 Siemens Aktiengesellschaft Method for the automatic adjustment of a protective device having an excess-current release, particularly a low-voltage circuit breaker

Also Published As

Publication number Publication date
SE7507412L (en) 1976-01-02
ATA498375A (en) 1976-12-15
SE404280B (en) 1978-09-25
NL7507740A (en) 1976-01-05
DE2431540C2 (en) 1984-09-13
FR2277513A7 (en) 1976-01-30
IT1040771B (en) 1979-12-20
CH591775A5 (en) 1977-09-30
AT338364B (en) 1977-08-25
DE2431540A1 (en) 1976-01-22
BE830861A (en) 1975-10-16

Similar Documents

Publication Publication Date Title
GB1508505A (en) Method and circuit for operating an electrical machine
ES411582A1 (en) Electronic motor protection relay with current-dependent release action
DE3167479D1 (en) Method and apparatus for determining the rotor resistance in an asynchronous electric machine
ES440677A2 (en) Zener diode effect on long acceleration module
IE781888L (en) A heating circuit
GB1504237A (en) Torque monitoring
ES2050063A1 (en) Method for the overload protection of devices which cannot endure continous running on account of heat loss
GB1405834A (en) Electrical loss-dependent thermal simulator circuit of an electrical operating means
JPS5637441A (en) Control device for air conditioner
SE7602161L (en) POWER CONTROL SYSTEM
JPS5686089A (en) Operator for magnetic flux vector of induction motor
JPS5649694A (en) Simulator for instantaneous power failure
JPS5286134A (en) Overload protector for motor
FR2450526A1 (en) Electric drill overheating protection circuit - has resistive temp. sensor in motor windings connected to triac to operate acoustic warning
GB918773A (en) Speed responsive device
JPS5332321A (en) Acceleration and deceleration control system for ac motor
SU1557621A2 (en) Device for determining heating of synchronous electric machine
SU838615A1 (en) Device for monitoring electronic circuit parameters
JPS5373701A (en) Method of compensating electric inertia of equivalent road simulation system
GB905855A (en) Synchronous motor control
JPS5289701A (en) Controlling circuit for the number of rotations of turbine
JPS5248031A (en) Control device for in-door wiring connected apparatus
JPS5245987A (en) Torque detecting system
JPS5731057A (en) Information processing equipment
Sastry et al. Dynamics of a power synchro system with shunt-connected rotor resistancesߞDynamic analysis and experimental results

Legal Events

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