US2906900A - Magnetic variable-speed device - Google Patents

Magnetic variable-speed device Download PDF

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Publication number
US2906900A
US2906900A US700128A US70012857A US2906900A US 2906900 A US2906900 A US 2906900A US 700128 A US700128 A US 700128A US 70012857 A US70012857 A US 70012857A US 2906900 A US2906900 A US 2906900A
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driven
drive
driving member
magnetic
windings
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Expired - Lifetime
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US700128A
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English (en)
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Cohen Elie
Roth Szymon
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
    • H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
    • H02K49/043—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with a radial airgap

Definitions

  • This invention relates to magnetic variable-speed drive devices or speed variators, more particularly to speed variators operating on the eddy-current principle as disclosed inter alia in our co-pending US. application Ser. No. 489,642, flled February 21, 1955, now Pat. No. 2,847,594, issued August 12, 1958, and also in our earlier French patents Nos. 1,117,613 and 1,132,712.
  • an improved variable-speed drive device comprises, in combination, a rotatable input element, a pair of independently rotatable driven elements coaxial therewith, a pair of magnetic means selectively energizable for establishing an eddy-current drive connection from said drive element to a desired one of said driven elements, a rotatable output element, and respective gear trains of different drive ratios connecting each driven element with the output element.
  • the said drive ratios are of opposite sign, whereby selective energization of one or the other of said magnetic means will cause the driven element to be totated in one or the opposite direction.
  • a drive or input shaft 1 is supported for rotation in spaced bearings 3 and 4 mounted in any suitable frame or casing, not illustrated.
  • An output shaft 2 is similarly supported in the frame in parallel spaced relation with the input shaft 1.
  • an inner rotor 5 made of a suitable magnetic material, e.g. magnetic steel, and including as shown a hub part 7, a radially projecting flange 5 and an annular peripheral flange of substantial extent in the axial direction, said peripheral flange being externally formed with parallel axially extending ribs, grooves, or splines 6.
  • tubular shafts 8 and 9 Surrounding the input shaft 1 on each side of the rotor hub 7, between it and the respective bearing 3 or 4, are a pair of tubular shafts 8 and 9 respectively, which are journalled for free rotation around the shaft 1 through bearings 10 and 11, so that the tubular shafts 8 and 9 are freely rotatable independently both of each other and of the input shaft 1 around which they are mounted.
  • Tubular shafts 8 and 9 constitute the hub parts of respective driven rotors or drag-cups generally designated 12' and 13', each of which comprises a radial flange or wall, secured to tubular hub 8 or 9, and an annular peripheral flange 12 or 13 both of which extend towards each other around the outer periphery of rotor 5 with the inner adjacent ends of said flanges 12 and 13 defining a comparatively narrow gap around the midplane of said rotor 5.
  • annular stator 14 Surrounding the composite rotor and dual drag-cup structure just described is an annular stator 14 of magnetic steel or the like, in which a pair of axially spaced windings 15 and 16 are housed so that winding 15 surrounds drag-cup 12 while winding 16 surrounds drag-cup 13.
  • the peripheral flange of each of drag-cups 12 and 13 is preferably formed with an annular groove in its outer surface, as indicated at 12a and 13a, so as to provide areas of increased magnetic reluctance substantially registering with the transverse midplane of each winding.
  • gear 17 and 18 Secured on the outer ends of tubular shafts or hubs 8 and 9 are respective drive gears 17 and 18, and secured at spaced points on the output shaft 2 are respective driven gears 21 and 23.
  • Gear 17 drives gear 21 by way of a gear train including two intermediate idler gears 19 and 2t suitably journalled in the frame of the device.
  • Gear 18 drives gear 23 by way of a gear train including a single intermediate idler gear 22 similarly journalled in he frame.
  • gear train 17192021 will tend to drive the shaft 2 in one direction (counterclockwise) whilst gear train r 3 18-22-23 will tend .to drive the shaft 2 in the opposite direction (clockwise).
  • gear train r 3 18-22-23 will tend .to drive the shaft 2 in the opposite direction (clockwise).
  • the apparatus described may be considered as actually comprising two cooperating eddy-current or drag-cup drive devices having a cominon drive rotor (the rotor With input shaft 1 driven in rotation from any source of power, then if winding 15 be energized to establish an eddy-current driving link from drive rotor 5 to driven rotor 12, the output shaft 2 will be rotated in an opposite direction relative to the rotation of shaft 1; yet if winding 16 is energized in place of winding 15, so as1to establish a driving link from drive rotor 5' to driven rotor 13, then the output shaft 2 will be rotated in the same direction as the rotation of shaft 1.
  • the rotation of output shaft 2 may be instantly reversed without having to reverse the rotation of the motor powering the input shaft 1, simply by throwing a suitable switch (not shown) whereby a suitable energizing circuit for the selected one of the two windings 15 and 16 is completed.
  • the driven shaft 2 may be driven at any desired velocity over a range extending from a maximum velocity in one direction to a maximum velocity in the opposite direction, for any given load torque.
  • the driven shaft is positioned coaxially with the drive shaft.
  • the particular number of gears in each of the two gear trains may differ from that shown.
  • the drive ratios through said gear trains may not necessarily be opposite in sign but might possess different values of similar sign so that the selective energization of the windings 15 and 16 would then serve to provide two different ranges of speed variation in the same direction rather than in opposite directions as shown herein; however, the construction wherein said drive ratios are of opposite sign, so as to provide for the drive-reversal feature disclosed herein, constitutes a preferred embodiment of the invention.
  • any suitable control circuits and switching means may be associated with the windings 15 and 16, depending on the particular application to which the device of the invention is to be put, as will be readily apparent to those familiar with the art.
  • An electromagnetic coupling comprising a substantially cylindrical rotatable driving member of ferromagnetic material, a stationary member coaxial with said driving member and provided with a pair of axially spaced windings facing different portions of said driving member, a pair of ferromagnetic driven elements coaxial with said driving member and rotatable independently thereof, said driven elements being interposed between said windings, respectively, and said driving member whereby energization of either of said windings causes magnetic flux to penetrate the respective driven element and the corresponding portion of said driving member, a rotatable output element, first and second transmission means of different transmission ratios respectively linking said output element with said driven elements, and switch means for selectively energizing said windings, thereby causing entrainment of the respective driven element by said driving member.
  • An electromagnetic coupling comprising a substantially cylindrical rotatable driving member of ferromagnetic material, a stationary member coaxial with said driving member and provided with a pair of axially spaced windings facing different portions of said driving member, a pair of ferromagnetic driven elements coaxial with said driving member and rotatable independently thereof, said driven elements being interposed between said windings, respectively, and said. driving member whereby energization of either of said windings causes magnetic flux to penetrate the respective driven element and the corresponding portion of said driving member, a rotatable out. put element, and first and second transmission means respectively linking said output element with said driven elements, said transmission means being effective in opposite senses of rotation.
  • An electromagnetic coupling comprising a substantially cylindrical rotatable driving member of ferromagnetic material, a stationary member coaxially surrounding said driving member and provided with a pair of axially spaced windings facing different portions of said driving member, a pair of ferromagnetic driven elements coaxial with said driving member and rotatable independently thereof, said driven elements being interposed between said windings, respectively, and said driving member whereby energization of either of said windings causes magnetic flux to penetrate the respective driven element and the corresponding portion of said driving member, a rotatable output element, and first and second transmission means of different transmission ratios respectively linking said output element with said driven elements.
  • An electromagnetic coupling comprising a substantially cylindrical rotatable driving member of ferromagnetic material, a stationary member coaxial with said driving member and provided with a pair of axially spaced windings facing difierent portions of said driving member, a pair of ferromagnetic driven elements coaxial with said driving member and rotatable independently thereof, said driven elements being interposed between said windings, respectively, and said driving member whereby energization of either of said windings causes magnetic flux to penetrate the respective driven element and the corresponding portion of said driving member, a rotatable output element, and first and second gear trains of different transmission ratios respectively linking said output element with said driven elements.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
US700128A 1957-04-23 1957-12-02 Magnetic variable-speed device Expired - Lifetime US2906900A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR844965X 1957-04-23
FR2906900X 1957-04-23

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US2906900A true US2906900A (en) 1959-09-29

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DE (1) DE1050882B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3202893A (en) * 1962-04-09 1965-08-24 Univ Iowa State Res Found Inc Variable differential gear drive automatic control apparatus for machines
US3202895A (en) * 1962-01-31 1965-08-24 Univ Iowa State Res Found Inc Automatic taped program control apparatus for a machine tool
US3249778A (en) * 1961-09-01 1966-05-03 Gen Electric Eddy current coupling
US3394278A (en) * 1966-12-01 1968-07-23 Schetinin Timofei Alexeevich Non-contact induction clutch

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1113978B (de) * 1959-10-31 1961-09-21 Rheinstahl Hanomag Ag Elektromagnetische Wirbelstromkupplung
DE1265840B (de) * 1961-04-01 1968-04-11 Prec Mecanique Labinal Antriebsanordnung zur Konstanthaltung der Drehzahl einer Abtriebswelle bei stark schwankender Drehzahl einer Antriebswelle mit einer Schlupfkupplung zwischen diesen Wellen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US744423A (en) * 1903-06-03 1903-11-17 Abram P Steckel Electrical clutch and brake mechanism.
US2428104A (en) * 1944-06-14 1947-09-30 Martin P Winther Eddy-current apparatus
DE904737C (de) * 1949-09-16 1954-02-22 Clark Equipment Co Insbesondere fuer den Antrieb von Flurfoerdergeraeten und aehnlichen kleineren Kraftfahrzeugen geeignete elektromagnetische Kupplung
US2679604A (en) * 1951-08-18 1954-05-25 Eaton Mfg Co Eddy current mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US744423A (en) * 1903-06-03 1903-11-17 Abram P Steckel Electrical clutch and brake mechanism.
US2428104A (en) * 1944-06-14 1947-09-30 Martin P Winther Eddy-current apparatus
DE904737C (de) * 1949-09-16 1954-02-22 Clark Equipment Co Insbesondere fuer den Antrieb von Flurfoerdergeraeten und aehnlichen kleineren Kraftfahrzeugen geeignete elektromagnetische Kupplung
US2679604A (en) * 1951-08-18 1954-05-25 Eaton Mfg Co Eddy current mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249778A (en) * 1961-09-01 1966-05-03 Gen Electric Eddy current coupling
US3202895A (en) * 1962-01-31 1965-08-24 Univ Iowa State Res Found Inc Automatic taped program control apparatus for a machine tool
US3202893A (en) * 1962-04-09 1965-08-24 Univ Iowa State Res Found Inc Variable differential gear drive automatic control apparatus for machines
US3394278A (en) * 1966-12-01 1968-07-23 Schetinin Timofei Alexeevich Non-contact induction clutch

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Publication number Publication date
DE1050882B (de)

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