GB734233A - Improvements in control arrangements for three-phase electric machines - Google Patents

Improvements in control arrangements for three-phase electric machines

Info

Publication number
GB734233A
GB734233A GB13013/53A GB1301353A GB734233A GB 734233 A GB734233 A GB 734233A GB 13013/53 A GB13013/53 A GB 13013/53A GB 1301353 A GB1301353 A GB 1301353A GB 734233 A GB734233 A GB 734233A
Authority
GB
United Kingdom
Prior art keywords
switch
motor
star
delta
relay
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
GB13013/53A
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.)
M I C E N AZIONARIA MA Soc
Original Assignee
M I C E N AZIONARIA MA Soc
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 M I C E N AZIONARIA MA Soc filed Critical M I C E N AZIONARIA MA Soc
Publication of GB734233A publication Critical patent/GB734233A/en
Expired 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
    • H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
    • H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
    • H02P25/18—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring with arrangements for switching the windings, e.g. with mechanical switches or relays

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Relay Circuits (AREA)
  • Motor And Converter Starters (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

734,233. Control of A.C. motors. S.A.M.I. C.E.N. SOC. AZIONARIA MANTOVANA IMPRESE COSTRUZIONI E NAVIGAZIONE. May 11, 1953 [May 10, 1952], No. 13013/53. Class 38 (3). In a system of star-delta control for a threephase motor, actuation of a push-button 1 closes a line contactor T1 which has a selfmaintaining contact 5. A star-connection switch T3 also closes for starting the motor, whereupon the switch 1 is released so that switch 2 closes automatically. A relay S1, which is responsive to the motor current, opens contacts 10 to disconnect the switch T3 and to close the delta-connection switch T2. The closure of the delta switch is maintained through contacts 11 of a relay S2 which has one operating coil energized in accordance with the motor current and an auxiliary coil energized with intermittent current, so that, if the motor current falls below a predetermined value and remains below it, the contacts 11 are opened during one of the periodic interruptions of the energization of the auxiliary winding of the relay S2. The opening of the contacts 11 de-energizes the delta-switch T2 and energizes the switch T3 so that the motor returns to the star-connection. After the opening of a time-delay contact 13R the motor connections may again be changed from star to delta. The intermittent current for energizing the auxiliary coil of the relay S2 is derived from a transformer Tr through a mercury switch M1 periodically operated by a bimetallic strip B. A mercury switch M2 operates when the bimetallic strip reaches its maximum deflection to disconnect the heater R for the strip which thus alternates between two extreme positions. The transformer Tr is disconnected .when the star switch T3 is closed. In a modification, Fig. 2 (not shown), the relay for shifting the motor windings from delta to star connection is of the electromagnetic type in which the magnetic circuit is closed by a movable armature. The parts coming into contact are polished so as to present a gap as small as possible, thus preventing chattering.
GB13013/53A 1952-05-10 1953-05-11 Improvements in control arrangements for three-phase electric machines Expired GB734233A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT734233X 1952-05-10

Publications (1)

Publication Number Publication Date
GB734233A true GB734233A (en) 1955-07-27

Family

ID=11315295

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13013/53A Expired GB734233A (en) 1952-05-10 1953-05-11 Improvements in control arrangements for three-phase electric machines

Country Status (2)

Country Link
BE (1) BE536043A (en)
GB (1) GB734233A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691155A (en) * 1979-04-06 1987-09-01 Taylor Noel R Automatic load seeking control for a motor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2071938B (en) * 1980-03-13 1984-01-04 Borg Warner Control system for ac induction motors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4691155A (en) * 1979-04-06 1987-09-01 Taylor Noel R Automatic load seeking control for a motor

Also Published As

Publication number Publication date
BE536043A (en)

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