BE789997A - Perfectionnements aux appareils de projection cinematographique - Google Patents

Perfectionnements aux appareils de projection cinematographique

Info

Publication number
BE789997A
BE789997A BE789997DA BE789997A BE 789997 A BE789997 A BE 789997A BE 789997D A BE789997D A BE 789997DA BE 789997 A BE789997 A BE 789997A
Authority
BE
Belgium
Prior art keywords
projection devices
cinematographic projection
cinematographic
devices
projection
Prior art date
Application number
Other languages
English (en)
Original Assignee
Bencini Spa
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.)
Publication date
Publication of BE789997A publication Critical patent/BE789997A/fr

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
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
    • H02P7/285—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only
    • H02P7/288—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance
    • H02P7/2885—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using variable impedance whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Direct Current Motors (AREA)
BE789997D 1972-03-25 Perfectionnements aux appareils de projection cinematographique BE789997A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2237672A IT950751B (it) 1972-03-25 1972-03-25 Circuito elettronico a transistore di potenza per la tratura e varia zione lineare di velocita a coppia costante di motore a collettore par ticolarmente per cineproiettori

Publications (1)

Publication Number Publication Date
BE789997A true BE789997A (fr) 1973-02-01

Family

ID=11195424

Family Applications (1)

Application Number Title Priority Date Filing Date
BE789997D BE789997A (fr) 1972-03-25 Perfectionnements aux appareils de projection cinematographique

Country Status (6)

Country Link
JP (1) JPS4916429A (fr)
BE (1) BE789997A (fr)
DE (1) DE2248378A1 (fr)
FR (1) FR2178518A5 (fr)
IT (1) IT950751B (fr)
NL (1) NL7214375A (fr)

Also Published As

Publication number Publication date
DE2248378A1 (de) 1973-09-27
FR2178518A5 (fr) 1973-11-09
IT950751B (it) 1973-06-20
NL7214375A (fr) 1973-09-27
JPS4916429A (fr) 1974-02-13

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