GB1020643A - A.c. electric motor - Google Patents

A.c. electric motor

Info

Publication number
GB1020643A
GB1020643A GB2879963A GB2879963A GB1020643A GB 1020643 A GB1020643 A GB 1020643A GB 2879963 A GB2879963 A GB 2879963A GB 2879963 A GB2879963 A GB 2879963A GB 1020643 A GB1020643 A GB 1020643A
Authority
GB
United Kingdom
Prior art keywords
auxiliary
rotor
control
auxiliary stator
motor
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
GB2879963A
Inventor
Frederic Calland Williams
John Frederick Eastham
Dennis Tipping
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.)
National Research Development Corp UK
Original Assignee
National Research Development Corp UK
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 National Research Development Corp UK filed Critical National Research Development Corp UK
Priority to GB2879963A priority Critical patent/GB1020643A/en
Publication of GB1020643A publication Critical patent/GB1020643A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Synchronous Machinery (AREA)

Abstract

1,020,643. Induction motors. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Oct. 19, 1964 [July 19, 1963], No. 28799/63. Heading H2A. In a wound-rotor induction motor, the use of slip-rings is avoided by connecting a resistor R permanently across each rotor coil 8, and S.C.R.'s or thyratrons D 1 , D 2 which may be rendered conducting to short-circuit the resistor when a trigger voltage is generated in windings 9, 10 on an auxiliary rotor. Variable excitation of the auxiliary stator thus acts to control the motor speed. The auxiliary generator produces high-frequency current, e.g. from short-pitched coils as shown in Fig. 2, currentlimiting resistors r and reverse-current-stopping diodes d being connected in series with them. The auxiliary stator may be of high pole number and its field have opposite rotation to the main machine. Full-wave operation of the auxiliary windings 9, 10 may be achieved by using full-wave or polyphase rectifiers at d, and the trigger-pulse may be lengthened by inductance. Two auxiliary machines may be used to provide alternative values of resistance. Speed control may be achieved by tachometric control of the on/off time of the auxiliary stator energization. The machine may operate as a single-phase repulsion motor by limiting the auxiliary stator winding to arcuate sections only.
GB2879963A 1963-07-19 1963-07-19 A.c. electric motor Expired GB1020643A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2879963A GB1020643A (en) 1963-07-19 1963-07-19 A.c. electric motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2879963A GB1020643A (en) 1963-07-19 1963-07-19 A.c. electric motor

Publications (1)

Publication Number Publication Date
GB1020643A true GB1020643A (en) 1966-02-23

Family

ID=10281367

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2879963A Expired GB1020643A (en) 1963-07-19 1963-07-19 A.c. electric motor

Country Status (1)

Country Link
GB (1) GB1020643A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500826A (en) * 1983-06-14 1985-02-19 Espinosa Fausto L Variable speed electric induction motors without brushes
US4736147A (en) * 1985-04-01 1988-04-05 Huazhong Institute Of Technology Method of starting motors by harmonics and electrical motors started by this method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4500826A (en) * 1983-06-14 1985-02-19 Espinosa Fausto L Variable speed electric induction motors without brushes
US4736147A (en) * 1985-04-01 1988-04-05 Huazhong Institute Of Technology Method of starting motors by harmonics and electrical motors started by this method

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