WO1999017421A1 - Alternator with mechnically adjustable output - Google Patents
Alternator with mechnically adjustable output Download PDFInfo
- Publication number
- WO1999017421A1 WO1999017421A1 PCT/US1998/018369 US9818369W WO9917421A1 WO 1999017421 A1 WO1999017421 A1 WO 1999017421A1 US 9818369 W US9818369 W US 9818369W WO 9917421 A1 WO9917421 A1 WO 9917421A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stator
- magnetic flux
- windings
- ring
- alternator
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
Definitions
- the present invention relates in general to alternators and in particular to a permanent magnet alternator whose output voltage can be mechanically regulated by varying the magnetic flux flow path through the alternator windings.
- Permanent magnet alternators are well known in the art and there are a variety of systems for controlling the output voltage thereof.
- the stator is actually movable with respect to the rotor for adjusting the voltage.
- U.S. Patent No. 4,578,609 a variable voltage permanent magnet alternator is disclosed in which a permanent magnet rotor is located within a hollow cylindrical stator.
- first and second annular iron members On the outside of the stator are first and second annular iron members that are axially movable with respect to the stator for causing an increase or decrease in magnetic flux flow through the stator windings.
- the present invention relates to an alternator in which a hollow cylindrical stator having a plurality of spaced windings thereon is attached to a housing.
- a permanent magnet rotor is mounted on the housing on one side of the stator for rotation with respect to the stator. Alternating polarity permanent magnets are placed on the stator for inducing magnetic flux into the stator windings as the rotor rotates.
- a mechanically operable ring is mounted on the other side of the stator for arcuate movement between first and second positions with respect to the stator. Magnetic flux carrying members on the ring create a maximum magnetic flux flow path through the windings from the permanent magnets when the ring is in a first position and creates a minimum magnetic flux flow path through the windings when the ring is in the second position.
- the mechanically operable ring may have spaced teeth thereon equal in number to the windings and that carry magnetic flux.
- the teeth extend radially outwardly and have an outer face thereon for juxtaposed radial alignment with a corresponding one of the interfaces on each winding core to create a maximum magnetic flux flow through the electrical windings in the first position of the ring and for radial alignment interposed between adjacent ones of the interfaces on each of the winding cores to create a minimum magnetic flux flow through the windings in the second position of the ring.
- the permanent magnet rotor is placed on the inside of the hollow cylindrical stator and the ring having the teeth thereon for adjusting the magnetic flux flow path is rotatedly mounted on the outside of the stator. Otherwise it functions as the first embodiment.
- the air gap is created by a number of cam followers which slide into and out of slots between the pole pieces.
- the cam followers are manufactured separately and joined with a nonmagnetic ring.
- the cam is a disk with a number of grooves in which pegs extending laterally from the respective cam followers are slideably mounted. The position of the cam is controlled by a linkage to rotate the cam and thus cause the pegs or pins to ride up and down in the grooves or slots to cause the cam followers to move in and out of the slots between the pole pieces thereby changing the magnetic flux flow path.
- an alternator with a mechanically adjustable output comprising a housing, a hollow cylindrical stator fixedly attached to the housing, a plurality of spaced windings on the stator for generating electricity, a permanent magnet rotor mounted on the housing on one side of the stator for rotation with respect to the stator, alternating polarity permanent magnets on the rotor for inducing magnetic flux into the windings as the rotor rotates, a mechanically operable ring mounted on the other side of the stator for arcuate movement between first and second positions with respect to the stator, and magnetic flux carrying members on the ring for creating a maximum magnetic flux flow path through the windings from the permanent magnets when the ring is in the first position and for creating a minimum magnetic flux flow path through the windings when the ring is in the second position.
- FIG. 1 is a schematic end view of the novel alternator of the present invention in a first embodiment in which the permanent magnet rotor is on the outside of the stator;
- FIG. 2 is a partial cross sectional top view of the alternator of FIG. 1;
- FIG. 3 is a partial schematic end view of an alternate embodiment of the present invention in which the permanent magnet rotor is mounted on the inside of the hollow cylindrical stator;
- FIG. 4 is a schematic representation of an end view of a third embodiment of the present invention in which the air gap is varied by means of cams of magnetic material that move into and out of the spaces between pole pieces;
- FIG. 5 is a partial schematic top view of the alternator of FIG. 4;
- FIG. 6 is a partial schematic representation of the cam followers of FIG. 4 in their retracted position to create a minimum magnetic flux flow
- FIG. 7 is a schematic representation of the cam followers in the extended position between pole pieces to create maximum flux flow
- FIG. 8 is a cross-sectional view of FIG. 6 taken along lines 8-8;
- FIG. 9 is a cross-sectional view of FIG. 7 taken along lines 9-9.
- FIG. 1 is a schematic representation of an end view of the novel alternator 10 of the present invention in which proportional control of the output of the alternator 10 can be achieved by mechanically altering the relationship between the rotor 12 and the stator 17.
- the alternator 10 has a rotor 12 rotatedly mounted to a housing 20 (shown in FIG. 2) in any well known manner.
- the rotor 12 has teeth 14 thereon that may be used for a variety of purposes well known in the art. It also has a plurality of permanent magnets 16 spaced around the inner periphery of the rotor 12.
- a stator 17 is formed of a nonmagnetic ring and attached in any well known manner to the housing 20.
- a plurality of coils 19 wound around magnetic of pole pieces 18 are wound separately and then joined together with the nonmagnetic ring 17 in a well-known fashion. Each winding or coil 19 has magnetic core 18 protruding inwardly therefrom with a face 26.
- Each of the magnetic teeth 22 extending outwardly from magnetic ring 21 has an outer face 28 for juxtaposed radial alignment with the corresponding one of the interfaces 26 on each magnetic core 18 to create a maximum magnetic flux flow path through the electrical windings or coil 19 when in the engaged position shown by linkage member or arm 24.
- the magnetic flux flows through the paths illustrated by arrows 30 and 32 to provide a maximum output voltage from the alternator.
- the linkage or arm 24 is moved to the position 26 illustrated in phantom lines, the magnetic teeth 22 on magnetic ring 21 are moved to the position shown in phantom lines 34.
- the hollow cylindrical stator 17 is fixedly attached to the housing 20 (FIG. 2) in any well known manner.
- a plurality of spaced windings 19 are joined together with the nonmagnetic ring 17 for generating electricity.
- a permanent magnet rotor 12 is mounted on the housing 20 on the outside of the stator 17 for rotation with respect to the stator 17 about shaft 13.
- Alternating polarity permanent magnets 16 are mounted on the rotor 12 for inducing magnetic flux into the windings 19 as the rotor 12 rotates.
- the mechanically operable ring 21 is mounted on the inside of the stator 17 for arcuate movement between a first position 24 and a second position 26 with respect to the stator 17.
- Magnetic flux carrying members or teeth 22 are formed on the mechanically operable magnetic ring 21 for creating a maximum magnetic flux flow path through the windings 19 from the permanent magnets 16 when the ring 21 is in the first position with the teeth 22 in radial alignment with the windings 19 and for creating a minimum magnetic flux flow path through the windings 19 when the ring 21 is in the second position 26 and the magnetic flux carrying teeth and ring are in the second position with the teeth 22 radially interposed between windings 19.
- the rotor 12 is in the form of a hollow cylinder
- the stator 17 is mounted inside the hollow rotor 12
- the mechanically operable magnetic ring 21 is mounted to the housing 20 for arcuate movement inside the stator 17.
- the alternator 10 functions in the identical manner as in FIG. 1 except that in the second embodiment, the rotor 12 is a solid cylinder mounted inside the hollow cylindrical stator 17 for rotatable movement therein and the mechanically movable ring 21 is magnetic flux conducting and is mounted to the housing for arcuate movement around the outside of the stator 17.
- the teeth 22 on magnetic ring 21 are in radial alignment with the core 18 of the windings 19 to create a maximum magnetic flux flow path through the windings as the magnets 16 pass the windings 19 during rotation of rotor 12.
- FIGS. 4 and 5 represent a third embodiment that works similarly to the first two embodiments but instead of changing the air gap by rotating a toothed ring, the air gap is created by a number of magnetic cam followers that slide into and out of slots between the pole pieces.
- the pole pieces are, of course as in the first case, manufactured separately and joined with a nonmagnetic ring that forms stator 17.
- the cam is a non-magnetic disk 36 with a number of grooves 41 in which pegs or pins 40 extending laterally from the cam followers 38 ride or are carried.
- the position of the cam disk 36 is controlled by the throttle linkage 48.
- a rotor 12 having permanent magnets 16 thereon are rotatedly mounted to a housing in a well known manner and rotated about shaft 13 (FIG. 5).
- the stator 17 again has a number of windings 19 formed thereon with magnetic cores or pole pieces 18 inside of the coils and extending inwardly towards the nonmetallic annular slotted guide ring or cam 36.
- FIGS. 6 and 8 when the handle 48 is moved to the position 50 shown in FIG. 4, the magnetic element or cam follower 38 is retracted as shown in FIGS. 6 and 8.
- FIG. 4 the air gap is created by a number of magnetic cam followers 38 that slide into and out of slots 39 between the magnetic pole pieces 18 that are manufactured separately and joined with the nonmagnetic ring that forms stator 17.
- Magnetic cam follower 38 cooperates with the disk 36 having a number of grooves 41 therein in which pegs or pins 40 extending from the magnetic cam followers 38 ride.
- the position of the cam followers 38 is controlled by the throttle linkage 48. Note in both FIGS. 6 and 8, that when the magnetic cam followers 38 are retracted, a gap 44 exists between the magnetic pole pieces 18 and the magnetic cam followers 38 thus creating a large air gap.
- FIG. 9 is a cross-sectional view of FIG. 7 taken along lines 9-9.
- the nonmagnetic disk 36 is rotated counterclockwise, because slots 41 are at an angle, the pins 40 ride upwardly thus forcing the magnetic cam followers 38 upwardly into the slots 39.
- the slots 39 are shown in FIG. 6. In that position, they are in close proximity with adjacent pole pieces 18 thus forming a complete magnetic path between adjacent pole pieces 18.
- the throttle linkage 48 is attached to the nonmagnetic disk 36 in any well known manner such as to a shoulder portion 46 shown in FIGS. 8 and 9.
- toothed wheel 12 and its associated magnets 16 are not shown in FIGS. 6, 7, 8 and 9. They are shown however in FIGS. 4 and 5.
- a variable air gap is created by the magnetic cam followers 38.
- the magnetic cam followers 38 are caused to slide into and out of the slots 39 between the magnetic pole pieces 18.
- the nonmagnetic disk 36 has a number of grooves 41 as shown in FIG. 4 in which a corresponding peg or pin 40 extending laterally from a magnetic cam follower 38 is movably located.
- the toothed wheel is placed on the outside of the stator and is moved between first and second positions to change the magnetic flux flow path from a maximum to minimum.
- the air gap is created by a number of magnetic cam followers which slide into and out of slots between the magnetic pole pieces.
- the pole pieces are manufactured separately and joined with a nonmagnetic ring.
- the magnetic cams cooperate with a disk having a number of grooves therein in which pegs or pins, laterally extending from the cam followers, ride. The position of the cam followers is controlled by the throttle linkage.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU93760/98A AU9376098A (en) | 1997-09-30 | 1998-09-04 | Alternator with mechnically adjustable output |
JP2000514373A JP2001518773A (en) | 1997-09-30 | 1998-09-04 | Alternator with mechanical output adjustment |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/941,586 US5834874A (en) | 1997-09-30 | 1997-09-30 | Alternator with mechanically adjustable output |
US08/941,586 | 1997-09-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999017421A1 true WO1999017421A1 (en) | 1999-04-08 |
Family
ID=25476726
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/018369 WO1999017421A1 (en) | 1997-09-30 | 1998-09-04 | Alternator with mechnically adjustable output |
Country Status (4)
Country | Link |
---|---|
US (1) | US5834874A (en) |
JP (1) | JP2001518773A (en) |
AU (1) | AU9376098A (en) |
WO (1) | WO1999017421A1 (en) |
Families Citing this family (37)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6348751B1 (en) * | 1997-12-12 | 2002-02-19 | New Generation Motors Corporation | Electric motor with active hysteresis-based control of winding currents and/or having an efficient stator winding arrangement and/or adjustable air gap |
US6166463A (en) * | 1998-11-25 | 2000-12-26 | Woodward, Jr.; Richard C. | Axial force electrical machines |
US6249069B1 (en) * | 1999-11-22 | 2001-06-19 | Bomardier Motor Corporation Of America | Output regulation of internal combustion engine alternator by mechanical means |
US6313560B1 (en) * | 1999-12-20 | 2001-11-06 | Pratt & Whitney Canada Corp. | Thermally protected electric machine |
US20040090195A1 (en) * | 2001-06-11 | 2004-05-13 | Motsenbocker Marvin A. | Efficient control, monitoring and energy devices for vehicles such as watercraft |
US6659815B2 (en) | 2001-06-11 | 2003-12-09 | Maruta Electric Boatworks Llc | Efficient motors and controls for watercraft |
US6858962B2 (en) * | 2001-09-05 | 2005-02-22 | The Regents Of The University Of California | Halbach array generator/motor having an automatically regulated output voltage and mechanical power output |
US6906446B2 (en) * | 2001-09-05 | 2005-06-14 | The Regents Of The University Of California | Halbach array generator/motor having mechanically regulated output voltage and mechanical power output |
US6492753B2 (en) | 2002-03-08 | 2002-12-10 | Dura-Trac Motors, Inc. | Brushless permanent magnet motor with variable axial rotor/stator alignment to increase speed capability |
US20040075279A1 (en) * | 2002-10-18 | 2004-04-22 | Breth Newton Roi | Wind powered electric generator |
US6920023B2 (en) * | 2003-03-21 | 2005-07-19 | Pratt & Whitney Canada Corp. | Current limiting means for a generator |
US7119467B2 (en) * | 2003-03-21 | 2006-10-10 | Pratt & Whitney Canada Corp. | Current limiting means for a generator |
US7119461B2 (en) * | 2003-03-25 | 2006-10-10 | Pratt & Whitney Canada Corp. | Enhanced thermal conductivity ferrite stator |
US7583063B2 (en) | 2003-05-27 | 2009-09-01 | Pratt & Whitney Canada Corp. | Architecture for electric machine |
US6965183B2 (en) | 2003-05-27 | 2005-11-15 | Pratt & Whitney Canada Corp. | Architecture for electric machine |
US7262539B2 (en) * | 2004-11-26 | 2007-08-28 | Pratt & Whitney Canada Corp. | Saturation control of electric machine |
US7545056B2 (en) * | 2003-05-27 | 2009-06-09 | Pratt & Whitney Canada Corp. | Saturation control of electric machine |
US6873071B2 (en) * | 2003-06-03 | 2005-03-29 | Pratt & Whitney Canada Corp. | Method, apparatus and system for controlling an electric machine |
US7253548B2 (en) * | 2003-06-16 | 2007-08-07 | Pratt & Whitney Canada Corp. | Method and apparatus for controlling an electric machine |
WO2005008865A1 (en) | 2003-07-18 | 2005-01-27 | Yamaha Hatsudoki Kabushiki Kaisha | Motor generator and electric vehicle having the same |
US6943478B2 (en) * | 2003-11-14 | 2005-09-13 | Dura-Trac Motors, Inc. | Brushless permanent magnet wheel motor with variable axial rotor/stator alignment |
WO2005076463A1 (en) * | 2004-02-06 | 2005-08-18 | Yamaha Hatsudoki Kabushiki Kaisha | Vehicle |
TWI283103B (en) * | 2004-02-06 | 2007-06-21 | Yamaha Motor Co Ltd | Rotating electric machine and electrically driven vehicle |
JP4664819B2 (en) * | 2004-02-06 | 2011-04-06 | ヤマハ発動機株式会社 | Electric vehicle |
KR100631533B1 (en) * | 2004-09-13 | 2006-10-09 | 엘지전자 주식회사 | Rotor structure for bldc motor |
JP2006191782A (en) | 2004-12-09 | 2006-07-20 | Yamaha Motor Co Ltd | Rotating-electric machine |
CN1787340B (en) * | 2004-12-09 | 2012-05-16 | 雅马哈发动机株式会社 | Rotary electrical machine |
JP2006345591A (en) * | 2005-06-07 | 2006-12-21 | Fuji Seratekku Kk | Flux controller in permanent magnet generator |
JP5089892B2 (en) * | 2005-08-05 | 2012-12-05 | ヤマハ発動機株式会社 | Rotating electric machine |
ES2359417T3 (en) * | 2005-08-05 | 2011-05-23 | Yamaha Hatsudoki Kabushiki Kaisha | STATOR FOR ROTARY ELECTRIC MACHINE. |
US7288923B1 (en) | 2006-04-21 | 2007-10-30 | Pratt & Whitney Canada Corp. | Voltage-limited electric machine |
JP5428185B2 (en) * | 2008-04-01 | 2014-02-26 | 日産自動車株式会社 | Axial gap type rotating electrical machine |
US8496080B2 (en) | 2010-09-30 | 2013-07-30 | National Taiwan University | Wheel driven mechanism |
US8288982B2 (en) * | 2010-12-10 | 2012-10-16 | Current Motor Company, Inc. | Permanent magnet motor with field weakening |
US9431877B2 (en) * | 2014-12-03 | 2016-08-30 | The Boeing Company | Concentric ring generators |
GB201704579D0 (en) * | 2017-03-23 | 2017-05-10 | Rolls Royce Plc | An electrical machine |
DE102019212472A1 (en) * | 2019-08-21 | 2021-02-25 | Robert Bosch Gmbh | Electrically commutated machine |
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US2492810A (en) * | 1948-08-02 | 1949-12-27 | Mcdermott Carl | Electric light generator for motor scooters and the like |
US4578609A (en) * | 1982-09-29 | 1986-03-25 | The Garrett Corporation | Permanent magnet dynamoelectric machine |
Family Cites Families (6)
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US2453523A (en) * | 1947-03-24 | 1948-11-09 | Chefford Master Mfg Co Inc | Bicycle generator regulated by rotor torque variations |
US3090879A (en) * | 1955-03-31 | 1963-05-21 | Barmag Barmer Maschf | Variable speed motor for winding apparatus |
US3401290A (en) * | 1966-05-12 | 1968-09-10 | Bendix Corp | Permanent magnet rotor electric generator with axially movable stator for adjusting voltage |
US3525005A (en) * | 1967-08-29 | 1970-08-18 | Edward Stanley Beyers | Axial air gap alternators with movable p-m disc rotor |
US4734604A (en) * | 1986-08-01 | 1988-03-29 | Cuisinarts, Inc. | Friction braking system and apparatus for appliance induction motor drive |
BE1000820A7 (en) * | 1987-08-10 | 1989-04-11 | Holden Karel | Alternator. |
-
1997
- 1997-09-30 US US08/941,586 patent/US5834874A/en not_active Expired - Fee Related
-
1998
- 1998-09-04 AU AU93760/98A patent/AU9376098A/en not_active Abandoned
- 1998-09-04 WO PCT/US1998/018369 patent/WO1999017421A1/en active Application Filing
- 1998-09-04 JP JP2000514373A patent/JP2001518773A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2492810A (en) * | 1948-08-02 | 1949-12-27 | Mcdermott Carl | Electric light generator for motor scooters and the like |
US4578609A (en) * | 1982-09-29 | 1986-03-25 | The Garrett Corporation | Permanent magnet dynamoelectric machine |
Also Published As
Publication number | Publication date |
---|---|
AU9376098A (en) | 1999-04-23 |
US5834874A (en) | 1998-11-10 |
JP2001518773A (en) | 2001-10-16 |
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