GB778187A - Improvements in and relating to frequency multiplication of alternating currents - Google Patents

Improvements in and relating to frequency multiplication of alternating currents

Info

Publication number
GB778187A
GB778187A GB1021553A GB1021553A GB778187A GB 778187 A GB778187 A GB 778187A GB 1021553 A GB1021553 A GB 1021553A GB 1021553 A GB1021553 A GB 1021553A GB 778187 A GB778187 A GB 778187A
Authority
GB
United Kingdom
Prior art keywords
windings
stator
rotor
transformer
winding
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
GB1021553A
Inventor
Brian Bowman Daly
Henryk Stevens
Philip Alexander Stow
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.)
Woods of Colchester Ltd
Original Assignee
Woods of Colchester 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 Woods of Colchester Ltd filed Critical Woods of Colchester Ltd
Priority to GB1021553A priority Critical patent/GB778187A/en
Publication of GB778187A publication Critical patent/GB778187A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00Adaptations of transformers or inductances for specific applications or functions
    • H01F38/02Adaptations of transformers or inductances for specific applications or functions for non-linear operation
    • H01F38/04Adaptations of transformers or inductances for specific applications or functions for non-linear operation for frequency changing

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Control Of Ac Motors In General (AREA)
  • Induction Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

778,187. Induction motors. WOODS OF COLCHESTER, Ltd. July 14, 1954 [April 14, 1953], No. 10215/53. Class 35. An induction motor is constructed with the stator combined with the core of a transformer, the windings on the stator also forming the primary windings of the transformer and being fed from a single phase or a three phase supply so that the stator is operated at saturation; the rotor winding forming the secondary of the transformer and the rotor being so associated with the stator that it is only responsive to the third harmonic flux so that the speed of the rotor is the speed corresponding to three times the supply frequency. The combined stator and transformer core 49 is cruciform in shape, one of the limbs being broken to form pole pieces 51, 52 between which is positioned a rotor 53 carrying a squirrel-cage winding which forms the secondary winding of the transformer. The remaining three limbs carry the rotor-connected stator or transformer primary windings 55, 56, 57 which when connected to a supply cause the core 49 to be operated at saturation. The fundamental frequency flux will circulate in the three core limbs carrying the windings 55, 56, 57; the third harmonic fluxes will be additive and flow through the rotor 53. Thus the rotor will be responsive only to the third harmonic flux. Shading rings 54 are provided to make the motor self-starting. A further means of making the motor self-starting is to provide it with interpoles and excite them with the third harmonic voltage only. In another embodiment the stator may be constructed as shown in Fig. 3. In this embodiment the three star connected stator or primary windings are wound on the pole pieces 67 each winding being placed half on one pole (e.g. A1) and half on the other pole (e.g. A2). If a further pair of poles 66 are added with similar winding arrangements but in which the windings are delta connected the motor becomes a two-phase motor. In order that the windings may be delta connected, however, auxiliary windings X, Y, Z must be provided, wound around the three parts of each pole piece and connected in series with the stator windings. Thus the third harmonic currents which would normally circulate in the delta connected windings are suppressed. The windings may, by the suitable use of a condenser, be connected to a singlephase supply. The construction can be further developed into a construction more in keeping with the normal construction of an induction motor by placing the stator windings in slots and suitably arranging the polarity of the poles; and by using a rotor with a short-circuited twopole winding. Although other odd harmonics could be utilized in an induction motor of the kind outlined above there are practical considerations against using harmonics higher than the third. Specification 778,188 is referred to.
GB1021553A 1953-04-14 1953-04-14 Improvements in and relating to frequency multiplication of alternating currents Expired GB778187A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1021553A GB778187A (en) 1953-04-14 1953-04-14 Improvements in and relating to frequency multiplication of alternating currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1021553A GB778187A (en) 1953-04-14 1953-04-14 Improvements in and relating to frequency multiplication of alternating currents

Publications (1)

Publication Number Publication Date
GB778187A true GB778187A (en) 1957-07-03

Family

ID=9963716

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1021553A Expired GB778187A (en) 1953-04-14 1953-04-14 Improvements in and relating to frequency multiplication of alternating currents

Country Status (1)

Country Link
GB (1) GB778187A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102692573A (en) * 2012-05-28 2012-09-26 无锡北科自动化科技有限公司 Submerged arc furnace transformer load monitoring and recording device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102692573A (en) * 2012-05-28 2012-09-26 无锡北科自动化科技有限公司 Submerged arc furnace transformer load monitoring and recording device

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