US3566168A - Eddy current rotary machine having torque transmission arrangement - Google Patents

Eddy current rotary machine having torque transmission arrangement Download PDF

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Publication number
US3566168A
US3566168A US837678A US3566168DA US3566168A US 3566168 A US3566168 A US 3566168A US 837678 A US837678 A US 837678A US 3566168D A US3566168D A US 3566168DA US 3566168 A US3566168 A US 3566168A
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United States
Prior art keywords
drums
eddy
inductor
supported
current
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Expired - Lifetime
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US837678A
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English (en)
Inventor
Toshiya Matsubara
Yoshibumi Taniwaki
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Yaskawa Electric Corp
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Yaskawa Electric Corp
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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

  • the drums consisting of magnetic material, are supported in spaced relation by nonmagnetic means interposed between the drums intermediate the ends between the inductor members on the one hand and the yoke on the other hand. Efficient cooling is afforded by a series of holes in the drums and the provision of fan blades for impelling air through the holes.
  • the present invention relates to improved eddy current rotary machines, in which torque transmission between a driving part and a driven part is carried out by eddy-currents as in the case of an eddy-current-type coupling or an eddy-current-type brake device.
  • an exciting winding is provided on an iron yoke member supported by the machine frame, a magnetic drum supported by a driving shaft and an inductor supported by a driven shaft are arranged between legs of said yoke member with a suitable air gap therebetween, and a magnetic path is formed through the above-mentioned members, whereby torque transmission between the driving and driven parts is attained by utilizing the eddy-currents generated between said magnetic drum and inductor.
  • an essential object of the present invention is to provide improved eddy-current rotary machines in which radiation or dissipation of the loss heat generated by the eddycurrents can be effectively attained without causing enlargement, expensiveness and complication of the machine.
  • the abovementioned object has been effectively attained by the machine comprising in combination: a first structure having at least two concentric eddy-current drums of magnetic material supported with a radial gap therebetween by nonmagnetic means interposed between the drums intermediate the ends thereof, the first structure being rotatably mounted for rotation about an axis concentric with the drums; a plurality of inductor members disposed in a circular array concentric with the axis and forming an inductor disposed in the gap between the drums on one side of the nonmagnetic means, the inductor constituting a second structure and being rotatably mounted for rotation about an axis coaxially with the first structure; a yoke member disposed in the gap between the drums on the other side of the nonmagnetic means from the inductor; exciting means for generating a magnetic flux passing through and linking the inductor, the yoke member, and both of the drums; and driving means coupled to one of the structures for
  • FIG. I is a side view, in section of one part, of a first example of the invention.
  • FIG. 2 is a vertically sectioned front view along line (II-ll) in FIG. 1;
  • FIG. 3 is a perspective .view of one part of the magnetic drum in the example of FIG. 1;
  • FIG. 4 is a vertically sectioned side view of only the upper half portion of a second example of the invention.
  • FIG. 5 is a side view, in vertical section, of only the upper half portion of a third example of the invention.
  • FIG. 6 is a side view, partially sectioned, of a fourth example of the invention.
  • FIG. 7 is a side view, partially sectioned, of a fifth example of the invention.
  • FIG. 8 is a sectional view along line VIII-VIII in FIG. 7.
  • the machine comprises a machine frame 1; a driving shaft 2 supported by the frame 1 through a bearing 3 and connected to the shaft of a driving motor (not shown); a driven shaft 4 supported by the frame 1 through a bearing 5; a magnetic structural body 6 supported by the driving shaft 2 by means of a hub 24, this body consisting of inner and outer eddy-current generating drums A and B which are separated through a suitable distance, but connected to each other at their central portions by means of nonmagnetic members 23; and an inductor 7 supported by the driven shaft 4 through a supporting plate 25, this inductor comprising a plurality of inductor pieces 27 which are magnetically separated from one another by means of nonmagnetic pieces 26 disposed between the plate 25 and inductor pieces 27 and arranged in a circumferential array.
  • the inductor pieces 27 are inserted into a space formed between the opposing inner and outer magnetic drums A and B from one side of the drums, and an iron yoke 8 is inserted into the space from other side of the drums, said yoke being fixed to the machine frame 1 and being provided with an exciting winding 9.
  • the magnetic drums A and B are provided with ventilating holes 10 and 11, respectively.
  • the ventilating hole 11 is provided with cooling fins 12 acting as centrifugal fans due to rotation thereof. Of course, both ventilating holes 10 and 11 may be provided with the fins 12 and these fins may be attached on the inside or outside of the ventilating hole or holes.
  • the supporting plate 25 is provided with a ventilating hole 13, and the machine frame I is provided with a suction inlet 14, air exhausting holes 15 and an air guide plate 16.
  • the magnetic flux I is made to fluctuate by relative difference between the rotary speed of the magnetic structural body 6 and that of the inductor 7, whereby an eddy-current is generated in the surfaces of each of the magnetic drums A and B, these surfaces being opposite to the inductor pieces 27, thus causing generation of a torque due to the eddy-current, thereby to rotate the driven shaft 4.
  • cooling air for removing the loss heat generated by the eddy-currents enters into the suction inlet 14 and passes through the ventilating hole 13 of the supporting plate 25.
  • the cooling air passed through the hole 13 is forcibly exhausted outward from the magnetic structural body 6 through the ventilating holes 10 and 11, while cooling the heat generating parts of the magnetic drums A and B, and then is exhausted from the exhaust outlets 15 of the machine frame 1.
  • FIG. 4 illustrates another example of the present invention, in which the eddy-current generating surface of the magnetic structural body 6 is increased, and the inductor pieces 17 are formed as multilayer pieces.
  • an auxiliary eddy-current generating drum C is arranged between opposed layers of the inductor pieces and rotated together with the eddy-current generating drums A and B.
  • the same or .equivalent members in FIG. 4 are indicated by the same reference numerals as those in FIGS. 1, 2 and 3, and since their functions are substantially equal to those of the example of FIGS. 1, 2 and 3, further explanation of the operation of the example of FIG. 4 is omitted herein.
  • FIG. 5 corresponds to a further improvement of the example of FIG. 1.
  • the example of FIG. 5 is substantially equal to that of FIG. 1 except that shielding plates 17 facing inner and outer surfaces of the magnetic drums A and B with narrow air therebetween are provided on the yoke member 8 and supporting plate 25, respectively, and partition plates 18 for shielding the ventilating holes 10 and 11 of the magnetic drums A and B are provided, whereby the inductor pieces 27 and exciting winding 9 are protected from entering of dust thereinto.
  • a suitable filter may be provided at the suction inlet 14 of each of the examples as illustrated in FIGS. 1, 4 and 5.
  • the eddy-current generating members are constructed as cylindrical magnetic drums, but may be formed as circular rings and disposed in opposition to each other in the axial direction, so as to form a magnetic path through the axial air gap, or one of the shafts 2 and 4 may be fixed thereby to use the machine as an eddy-current brake device, or the shafts 2 and 4 may be, respectively, used as the driven shaft and driving shaft.
  • the eddy-current generating drums are arranged at the outside position and extended toward the outside of the iron yoke member, so that contacting of the drums by the ventilating cooling air and accordingly their heat exchange becomes very effective, whereby highly effective dissipation of the loss heat due to the eddy-currents can be attained by the cooling effect of the broad area of the drums.
  • the above-mentioned cooling effect can be further improved by provision of ventilating holes in the drums.
  • both the inductor and yoke member are arranged in the space formed between opposite drums, so that any thrust force due to magnetic attraction force between various parts cannot be applied to the shafts, thus causing simplification of the bearings.
  • This advantage can cause minimization of the machine structure together with the effective cooling effect, thereby to simplify the construction, manufacturing and inspection of the machine.
  • FIG. 6 in which the same or equivalent members as those of the example of FIGS. 1 and 2 are designated by the same reference numerals, there are provided a partition plate 19 supported by the driving shaft 2 so as to separate the outside and inside space of the eddy-current generating structure, cooling fans 20, 21 being provided, respectively, on front and rear surfaces of said partition plate 19, and a ventilating guide plate 22 to protect efi'ectively the machine from overheating due to the eddy-current loss.
  • a driving motor may be enclosed within the machine frame including therein the eddy-current generating structure.
  • the machine of FIGS. 7 and 8 comprises, in a machine frame 1 which is provided with air suction inlets 42, 43 and an air exhaust outlet 36 and which supports a driven shaft 4 through bearings 32, an electric motor comprising a stator 28 having a stator winding 29 and a rotor 30 having an end ring 31; a hollow shaft 35 supporting said rotor 30 therearound and supported by means of bearings 33, 34 on the driven shaft 4 which passes through the hollow space of the shaft 35; a fan plate 37 provided with double fans 38, 39 and supported by the hollow shaft 35; an eddycurrent generator consisting of magnetic drums A and B which are connected by a nonmagnetic member 41 so as to form a space therebetween, this eddy-current generator being attached to the driven shaft 4 by means of a hub 44 formed integrally with the inner magnetic drum A and having a ventilating hole 45; inductor pieces 27
  • cooling-air is sucked in through the inlets 42 and 43 and discharged out from the outlet 36 by action of the double fans 38 and 39, whereby the cooling of the eddycurrent device and driving motor is effectively attained.
  • an extremely miniaturized eddy-current coupling machine can be realized by skillful combination of an electric motor and an eddy-current device.
  • An eddy-current rotary machine comprising in combination: a first structure having at least two concentric eddy-current drums of magnetic material supported with a radial gap therebetwe'en by nonmagnetic means interposed between said drums intermediate the ends thereof, said first structure being rotatably mounted for rotation about an axis concentric with said drums; a plurality of inductor members disposed in a circular array concentric with said axis and forming an inductor disposed in said gap between said' drums on one side of said nonmagnetic means; said inductor constituting a second structure and being rotatably mounted for rotation about an axis coaxially with said first structure; a yoke member disposed in said gap between said drums on the other side of said nonmagnetic means from said inductor; exciting means for generating a magnetic flux passing through and linking said inductor, said yoke member, and both of said'dr ums; and driving means coupled to one of said structures for causing it to rotate
  • An eddy-current rotary machine as claimed in claim 2 in which shields are supported adjacent the ends of said drums to provide an air bafi'le between the drums and the yoke member on one side and between the drums and the inductor on the other side, and the ventilating holes in one of said drums are in registration with corresponding holes of the other of said drums with plates spanning the space between the drums around opposite holes to shield the yoke member and inductor from dust.
  • An eddy-current rotary machine as claimed in claim I in which the driving means is coupled to said second structure and is in the form of a shaft, and wherein a partition plate is mounted on said shaft for rotation, fan elements are provided on both sides of said partition plate radially spaced from said shaft, and said inductor members are joined to the fan ele-' ments on the side of said partition facing said drums.
  • An eddy-current rotary machine which comprises a driven shaft supported by a machine frame having ventilating holes; an electric motor enclosed in said machine frame and consisting of a stator and a rotator, the rotator being supported by a hollow shaft-through which said driven shaft passes; an eddy-current generator consisting of mutually opposed concentric radially spaced apart magnetic drums supmotor and said eddy-current generator, whereby said motor and generator portions in the frame are effectively cooled.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Motor Or Generator Cooling System (AREA)
US837678A 1968-07-01 1969-06-30 Eddy current rotary machine having torque transmission arrangement Expired - Lifetime US3566168A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP43046379A JPS5011007B1 (enrdf_load_stackoverflow) 1968-07-01 1968-07-01

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US3566168A true US3566168A (en) 1971-02-23

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US837678A Expired - Lifetime US3566168A (en) 1968-07-01 1969-06-30 Eddy current rotary machine having torque transmission arrangement

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US (1) US3566168A (enrdf_load_stackoverflow)
JP (1) JPS5011007B1 (enrdf_load_stackoverflow)
DE (1) DE1932845A1 (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624436A (en) * 1970-11-13 1971-11-30 Eaton Yale & Towne Air-cooled electromagnetic brake
US3863083A (en) * 1973-06-13 1975-01-28 Eaton Corp Fluid-cooled dynamometer
US4129249A (en) * 1977-08-17 1978-12-12 Baker Perkins Inc. Centrifuge for separating solids and liquids
US4446391A (en) * 1980-10-24 1984-05-01 Mitsubishi Denki Kabushiki Kaisha Rotating electric machinery
US4469966A (en) * 1981-10-28 1984-09-04 Mitsubishi Denki Kabushiki Kaisha Electric generator for use with vehicles
US4564775A (en) * 1982-04-15 1986-01-14 Societe De Paris Et Du Rhone, S.A. Device for rotatably driving a cooling fan of an electric rotating machine
US5557153A (en) * 1993-09-15 1996-09-17 Abb Management Ag Air-cooled rotating electrical machine
US5611415A (en) * 1994-02-25 1997-03-18 Horton, Inc. Rotational control apparatus
US5613586A (en) * 1994-02-25 1997-03-25 Horton, Inc. Rotational control apparatus
US5627422A (en) * 1993-03-18 1997-05-06 Paul D. Boggs, III Shaft mounted eddy current drive
US5636719A (en) * 1994-02-25 1997-06-10 Horton, Inc. Rotational control apparatus
US5650679A (en) * 1993-03-18 1997-07-22 Boggs, Iii; Paul Dewey Eddy current drive
US5751079A (en) * 1996-10-17 1998-05-12 Ford Motor Company Alternator with internal and external fans
US5994810A (en) * 1997-02-12 1999-11-30 Horton, Inc. Integral steel-aluminum ring for eddy current activated friction clutch
US20110209965A1 (en) * 2008-11-12 2011-09-01 Horton, Inc. Two-speed clutch and retro-fit kit
US9130446B2 (en) 2012-11-28 2015-09-08 Abd El & Larson Holdings, LLC Eddy current torque transfer coupling assembly
US20150280536A1 (en) * 2014-04-01 2015-10-01 Siemens Aktiengesellschaft Electric machine with permanently excited inner stator
US9458844B2 (en) 2013-06-21 2016-10-04 Hamilton Sundstrand Corporation Propeller rotor and engine overspeed control
US10935321B2 (en) 2015-02-04 2021-03-02 Kilr-Chilr, Llc Energy transfer systems and energy transfer methods

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1684128B1 (de) * 1968-01-10 1970-09-03 Zeller Dipl Ing Eckhart Fussleiste
JPS57193951A (en) * 1981-05-19 1982-11-29 Mitsubishi Electric Corp Rotary electric machine
JPS58145080U (ja) * 1982-03-25 1983-09-29 澤藤電機株式会社 車両用ブラシレスオルタネ−タ
DE3530528A1 (de) * 1985-08-27 1987-04-16 Gerhard Hess Fussbodenleiste aus einem gebogenen metallschienenverstaerkten bodenbelagstreifen
JPH0614782B2 (ja) * 1989-08-28 1994-02-23 いすゞ自動車株式会社 渦電流式減速装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808845A (en) * 1929-10-08 1931-06-09 Leland Gifford Co Cooling device for motors
US2099050A (en) * 1934-06-19 1937-11-16 Chicago Flexible Shaft Co Speed control mechanism
US2542138A (en) * 1949-02-02 1951-02-20 Dynamatic Corp Dynamoelectric torque-transmitting apparatus
US2630466A (en) * 1950-01-24 1953-03-03 Landis Robert Eddy-current clutch and brake motor
US2871383A (en) * 1956-05-14 1959-01-27 Eaton Mfg Co Electric coupling and brake
US2908834A (en) * 1958-07-30 1959-10-13 Allis Louis Co Air-cooled eddy current coupler device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808845A (en) * 1929-10-08 1931-06-09 Leland Gifford Co Cooling device for motors
US2099050A (en) * 1934-06-19 1937-11-16 Chicago Flexible Shaft Co Speed control mechanism
US2542138A (en) * 1949-02-02 1951-02-20 Dynamatic Corp Dynamoelectric torque-transmitting apparatus
US2630466A (en) * 1950-01-24 1953-03-03 Landis Robert Eddy-current clutch and brake motor
US2871383A (en) * 1956-05-14 1959-01-27 Eaton Mfg Co Electric coupling and brake
US2908834A (en) * 1958-07-30 1959-10-13 Allis Louis Co Air-cooled eddy current coupler device

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3624436A (en) * 1970-11-13 1971-11-30 Eaton Yale & Towne Air-cooled electromagnetic brake
US3863083A (en) * 1973-06-13 1975-01-28 Eaton Corp Fluid-cooled dynamometer
US4129249A (en) * 1977-08-17 1978-12-12 Baker Perkins Inc. Centrifuge for separating solids and liquids
US4446391A (en) * 1980-10-24 1984-05-01 Mitsubishi Denki Kabushiki Kaisha Rotating electric machinery
US4469966A (en) * 1981-10-28 1984-09-04 Mitsubishi Denki Kabushiki Kaisha Electric generator for use with vehicles
US4564775A (en) * 1982-04-15 1986-01-14 Societe De Paris Et Du Rhone, S.A. Device for rotatably driving a cooling fan of an electric rotating machine
US5627422A (en) * 1993-03-18 1997-05-06 Paul D. Boggs, III Shaft mounted eddy current drive
US5650679A (en) * 1993-03-18 1997-07-22 Boggs, Iii; Paul Dewey Eddy current drive
US5557153A (en) * 1993-09-15 1996-09-17 Abb Management Ag Air-cooled rotating electrical machine
US5636719A (en) * 1994-02-25 1997-06-10 Horton, Inc. Rotational control apparatus
US5613586A (en) * 1994-02-25 1997-03-25 Horton, Inc. Rotational control apparatus
US5611415A (en) * 1994-02-25 1997-03-18 Horton, Inc. Rotational control apparatus
US5821658A (en) * 1995-07-06 1998-10-13 Boggs, Iii; Paul Dewey Speed control in self-powered eddy current drive
US5751079A (en) * 1996-10-17 1998-05-12 Ford Motor Company Alternator with internal and external fans
US5994810A (en) * 1997-02-12 1999-11-30 Horton, Inc. Integral steel-aluminum ring for eddy current activated friction clutch
US8544627B2 (en) 2008-11-12 2013-10-01 Horton, Inc. Two-speed clutch and retro-fit kit
US20110209965A1 (en) * 2008-11-12 2011-09-01 Horton, Inc. Two-speed clutch and retro-fit kit
US9140309B2 (en) 2008-11-12 2015-09-22 Horton, Inc. Two-speed clutch and kit
US9130446B2 (en) 2012-11-28 2015-09-08 Abd El & Larson Holdings, LLC Eddy current torque transfer coupling assembly
US9458844B2 (en) 2013-06-21 2016-10-04 Hamilton Sundstrand Corporation Propeller rotor and engine overspeed control
US20150280536A1 (en) * 2014-04-01 2015-10-01 Siemens Aktiengesellschaft Electric machine with permanently excited inner stator
US9935534B2 (en) * 2014-04-01 2018-04-03 Siemens Aktiengesellschaft Electric machine with permanently excited inner stator
US10935321B2 (en) 2015-02-04 2021-03-02 Kilr-Chilr, Llc Energy transfer systems and energy transfer methods

Also Published As

Publication number Publication date
JPS5011007B1 (enrdf_load_stackoverflow) 1975-04-26
DE1932845A1 (de) 1970-01-15

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