US3252021A - Flywheel magneto - Google Patents

Flywheel magneto Download PDF

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Publication number
US3252021A
US3252021A US290538A US29053863A US3252021A US 3252021 A US3252021 A US 3252021A US 290538 A US290538 A US 290538A US 29053863 A US29053863 A US 29053863A US 3252021 A US3252021 A US 3252021A
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Prior art keywords
rotor
windings
magnet
magneto
stator
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Expired - Lifetime
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US290538A
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Stanley M Terry
Bob O Burson
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RE Phelon Co Inc
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Phelon Co Inc
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    • 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
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H02K21/222—Flywheel magnetos
    • H02K21/225—Flywheel magnetos having I-shaped, E-shaped or similarly shaped armature cores

Definitions

  • An object of the present invention is to provide a new and improved flywheel type magneto which is particularly adapted for operation with automatic spark advance.
  • Another object of the invention is to provide a new and improved flywheel type magneto of the type set forth which provides adequate ignition voltage both for starting at low cranking speed and for high speedoperation and which is designed to advance at relatively low engine speeds to provide optimum engine torque output for acv celerating under heavy load.
  • Another object is to provide a new and improved flywheel type magneto of the type set forth which produces such adequate voltage without the necessity that the ad- Vance mechanism be set for excessively high speeds.
  • Another object is to provide a new and improved flywheel type magneto of the type set forth which is particularly adapted to provide high ignition voltage in any normal designed range of advance, for example, fifteen degrees to twenty-five degrees or more.
  • Another object of the invention is to provide a new and improved flywheel type magneto of the type set forth which is both simple to apply to engines and economical to manufacture.
  • FIG. 1 is a fragmentary top view of a flywheel type magneto embodying the present invention
  • FIG. 2 is a sectional view taken on line 2-2 of FIG. 1, looking in the direction of the arrows;
  • FIG. 3 is a fragmentary bottom view of the device shown in FIGS. 1 and 2;
  • FIG. 4 is a schematic view of the electrical system of the apparatus.
  • the device shown therein comprises a low tension flywheel type magneto having a stator and a rotor 11, said rotor 11 carrying the magnet 13 and the 3,252,021 Patented May 17, 1966 associated pole pieces 14 and being mounted for rotary movement upon the engine crankshaft or shaft 12 which is adapted to be rotated in timed relationship with the engine.
  • the stator 10 is provided with a three legged or poled laminated magnetic structure or core 15 having low ten sion primary generating coils or windings 16 upon the first two legs thereof in the direction of rotation of the rotor 11, said two windings 16 being connected in series.
  • Said two coils or windings 16 may be identical or may be tailored for special engine operating requirements.
  • the capacitator 17 and the breaker 18, which is operated by the cam 19, are connected across the stator windings 16 and the high tension step-up transformer 20 is connected across said breaker 18 and said windings 16 and in parallel with said stator windings 16.
  • Any conventional means may be used to advance, either mechanically or automatically, the timing of the device and to change the phase relation between the cam 19 and the crankshaft 12.
  • An example of such means is, for example, that disclosed in United States Patent Number 2,806,156 to R. E. Phelon where the breaker cam is connected to the shaft by means of a rotatably adjustable sleeve, which sleeve is adjustable relative to said a shaft, such that advance or retardment may be obtained as the speed of the engine increases or decreases.
  • the magneto In the operation of the foredescribed magneto, at starting the magneto operates normally. At low speed operation, the magneto breaks on the reversal of flux in the coil or winding 16 on the middle leg of the laminated magnetic structure 15 carried by the stator 10. During this period, the second or other primary coil 16 is merely in series with said working primary coil 16, and, being open circuited magnetically and having low impedance, it has little effect on the final voltage output of the device.
  • the second primary coil 16 on the leading leg of the structure 15, which is connected in series with the center primary coil 16, will generate an equal voltage and, in effect, double the effective induced voltage in the total primary circuit as, in the advanced position, the two windings 16 upon the laminated structure or core 15 will be generating simultaneously.
  • a flywheel magneto having a stator and a rotor, a magnet carried by said rotor, pole shoes carried by said rotor and operatively associated with said magnet, a three legged laminated magnetic structure on said stator and operatively positioned thereon with regard to said magnet on said rotor, windings upon the first two legs of said laminated magnetic structure to be engaged by said rotor magnet and associated pole shoes during the operation of the magneto, said windings being connected in series, and a transformer connected in parallel with said windings on said magnetic structure.
  • a flywheel magneto having a stator and a rotor, said rotor being mounted for rotary movement upon a crankshaft, a magnet carried by said rotor, pole shoes carried by said rotor and operatively associated with said magnet, a three legged laminated magnetic structure on said stator and operatively positioned thereon with regard to said magnet on said rotor, windings upon the first two legs of said laminated magnetic structure to be engaged by said rotor magnet and associated pole shoes during the operation of the magneto, said windings being connected in series, a transformer connected in parallel with said windings onsaid magnetic structure, and a breaker connected across said windings, a cam operatively connected to and operating said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.
  • a flywheel'magneto having a stator and a rotor, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet, a three poled laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two poles of said laminated magnetic structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, and a transformer connected in parallel with said stator windings.
  • a flywheel magneto having a stator and a rotor, said rotor being mounted for rotation upon a crankshaft, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet, a three poled laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two poles of said laminated magnetic structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, a transformer connected in parallel with said windings, a breaker connected across said windings, a cam operatively connected to and operating said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.
  • a flywheel magneto having a stator and a rotor, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet
  • ⁇ magnet a three legged laminated magnetic structure on a three legged laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two legs of said three legged structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, and a high tension transformer connected in parallel with said windings.
  • a flywheel magneto having a stator and a rotor, said rotor being mounted for rotary movement upon a crankshaft, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the two leading legs of said three legged laminated structure, said two windings being connected in series, a high tension transformer connected in parallel with said windings, a
  • breaker connected across said windings, a cam operatively connected to said breaker such as to operate said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.

Description

y 17, 1966 s. M. TERRY Em, 3,252,021
FLYWHEEL MAGNETO Filed June 25, 1963 3 Sheets-Sheet l INVENTORS- 2 STANLEY M. TEEPY BOB o- BUESON May 17, 1966 s. M. TERRY ETAL FLYWHEEL MAGNETO 3 Sheets-Sheet 2 Filed June 25, 1963 INVENTORS. STANLEY P". TERRY BOB 0. EU 125 ATTOP/VEK May 17, 1966 s. M. TERRY ETAL FLYWHEEL MAGNE'I'O 3 Sheets-Sheet 5 Filed June 25, 1963 INVENTORS. M TEEIZY BUT? SON STANLEY OB C) B BY 2 Z ATTOP/VEM United States. Patent This invention relates to flywheel type magnetos or the like and has particular reference to the provision of a new and improved flywheel type magneto which is particularly adapted to operation with automatic spark advance.
Small, high output gasoline engines are being applied in increasingly large numbers in a large variety of applications such as, for example, in lawn, garden and farm equipment.
In order to enhance the star-ting and to improve the high speed operations of such engines, automatic spark advance i being increasingly utilized thereon.
However, when automatic spark advance is applied to conventional magnetos, either the low speed or the high speed voltage output has been found to be inadequate or the advance change over has had to operate at excessively high speed in order to generate adequate voltage after advance with resultant low torque at the lower speeds and loss of operating efiiciency of the engine.
An object of the present invention is to provide a new and improved flywheel type magneto which is particularly adapted for operation with automatic spark advance.
Another object of the invention is to provide a new and improved flywheel type magneto of the type set forth which provides adequate ignition voltage both for starting at low cranking speed and for high speedoperation and which is designed to advance at relatively low engine speeds to provide optimum engine torque output for acv celerating under heavy load.
Another object is to provide a new and improved flywheel type magneto of the type set forth which produces such adequate voltage without the necessity that the ad- Vance mechanism be set for excessively high speeds.
Another object is to provide a new and improved flywheel type magneto of the type set forth which is particularly adapted to provide high ignition voltage in any normal designed range of advance, for example, fifteen degrees to twenty-five degrees or more.
Another object of the invention is to provide a new and improved flywheel type magneto of the type set forth which is both simple to apply to engines and economical to manufacture.
Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawings. It will be understood that changes may be made in the details of construction and arrangement of parts shown and described as the preferred form of the invention has been given by way of illustration only.
Referring to the drawings:
FIG. 1 is a fragmentary top view of a flywheel type magneto embodying the present invention;
FIG. 2 is a sectional view taken on line 2-2 of FIG. 1, looking in the direction of the arrows;
FIG. 3 is a fragmentary bottom view of the device shown in FIGS. 1 and 2; and
FIG. 4 is a schematic view of the electrical system of the apparatus.
Referring more particularly to the drawings wherein similar reference characters designate corresponding parts throughout, the device shown therein comprises a low tension flywheel type magneto having a stator and a rotor 11, said rotor 11 carrying the magnet 13 and the 3,252,021 Patented May 17, 1966 associated pole pieces 14 and being mounted for rotary movement upon the engine crankshaft or shaft 12 which is adapted to be rotated in timed relationship with the engine.
The stator 10 is provided with a three legged or poled laminated magnetic structure or core 15 having low ten sion primary generating coils or windings 16 upon the first two legs thereof in the direction of rotation of the rotor 11, said two windings 16 being connected in series.
Said two coils or windings 16 may be identical or may be tailored for special engine operating requirements.
The capacitator 17 and the breaker 18, which is operated by the cam 19, are connected across the stator windings 16 and the high tension step-up transformer 20 is connected across said breaker 18 and said windings 16 and in parallel with said stator windings 16.
Any conventional means may be used to advance, either mechanically or automatically, the timing of the device and to change the phase relation between the cam 19 and the crankshaft 12. An example of such means is, for example, that disclosed in United States Patent Number 2,806,156 to R. E. Phelon where the breaker cam is connected to the shaft by means of a rotatably adjustable sleeve, which sleeve is adjustable relative to said a shaft, such that advance or retardment may be obtained as the speed of the engine increases or decreases.
In the operation of the foredescribed magneto, at starting the magneto operates normally. At low speed operation, the magneto breaks on the reversal of flux in the coil or winding 16 on the middle leg of the laminated magnetic structure 15 carried by the stator 10. During this period, the second or other primary coil 16 is merely in series with said working primary coil 16, and, being open circuited magnetically and having low impedance, it has little effect on the final voltage output of the device.
When the cam 19 is advanced, whether mechanically or automatically, the break occurs on the buildup and less voltage will, of course, be generated in a given primary coil.
Thus, the second primary coil 16 on the leading leg of the structure 15, which is connected in series with the center primary coil 16, will generate an equal voltage and, in effect, double the effective induced voltage in the total primary circuit as, in the advanced position, the two windings 16 upon the laminated structure or core 15 will be generating simultaneously.
From the foregoing, it will be seen that we have provided a new and improved high output flywheel type magneto with automatic spark advance, and high output at all speeds of the cam.
From the foregoing, it will be seen that we have provided new and improved means for accomplishing all of the objects and advantages of the invention.
We claim:
1. In a flywheel magneto having a stator and a rotor, a magnet carried by said rotor, pole shoes carried by said rotor and operatively associated with said magnet, a three legged laminated magnetic structure on said stator and operatively positioned thereon with regard to said magnet on said rotor, windings upon the first two legs of said laminated magnetic structure to be engaged by said rotor magnet and associated pole shoes during the operation of the magneto, said windings being connected in series, and a transformer connected in parallel with said windings on said magnetic structure.
2. In a flywheel magneto having a stator and a rotor, said rotor being mounted for rotary movement upon a crankshaft, a magnet carried by said rotor, pole shoes carried by said rotor and operatively associated with said magnet, a three legged laminated magnetic structure on said stator and operatively positioned thereon with regard to said magnet on said rotor, windings upon the first two legs of said laminated magnetic structure to be engaged by said rotor magnet and associated pole shoes during the operation of the magneto, said windings being connected in series, a transformer connected in parallel with said windings onsaid magnetic structure, and a breaker connected across said windings, a cam operatively connected to and operating said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.
3. In a flywheel'magneto having a stator and a rotor, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet, a three poled laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two poles of said laminated magnetic structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, and a transformer connected in parallel with said stator windings.
4. In a flywheel magneto having a stator and a rotor, said rotor being mounted for rotation upon a crankshaft, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet, a three poled laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two poles of said laminated magnetic structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, a transformer connected in parallel with said windings, a breaker connected across said windings, a cam operatively connected to and operating said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.
5. In a flywheel magneto having a stator and a rotor, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said magnet,
} magnet, a three legged laminated magnetic structure on a three legged laminated magnetic structure on said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the first two legs of said three legged structure to be engaged by said rotor magnet and associated pole pieces during the operation of the magneto, said two windings being connected in series, and a high tension transformer connected in parallel with said windings.
6. In a flywheel magneto having a stator and a rotor, said rotor being mounted for rotary movement upon a crankshaft, a magnet carried by said rotor, pole pieces carried by said rotor and operatively associated with said said stator and operatively positioned thereon relative to said magnet on said rotor, windings upon the two leading legs of said three legged laminated structure, said two windings being connected in series, a high tension transformer connected in parallel with said windings, a
breaker connected across said windings, a cam operatively connected to said breaker such as to operate said breaker, and means for changing the phase relationship between said cam and said magneto crankshaft.
References Cited by the Examiner r ORIS L. RADER, Primary Examiner.
MILTON O. HIRSHFIELD, Examiner.
A. I. ROSSI, Assistant Examiner.

Claims (1)

1. IN A FLYWHEEL MAGNETO HAVING A STATOR AND A ROTOR, A MAGNET CARRIED BY SAID ROTOR, POLE SHOES CARRIED BY SAID ROTOR AND OPERATIVELY ASSOCIATED WITH SAID MAGNET, A THREE LEGGED LAMINATED MAGNETIC STRUCTURE ON SAID STATOR AND OPERATIVELY POSITIONED THEREON WITH REGARD TO SAID MAGNET ON SAID ROTOR, WINDINGS UPON THE FIRST TWO LEGS OF SAID LAMINATED MAGNETIC STRUCTURE TO BE ENGAGED BY SAID ROTOR
US290538A 1963-06-25 1963-06-25 Flywheel magneto Expired - Lifetime US3252021A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11363402B2 (en) 2019-12-30 2022-06-14 Comhear Inc. Method for providing a spatialized soundfield

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR719183A (en) * 1931-06-26 1932-02-02 Ruthardt & Co G M B H Lighting and ignition dynamo applicable in particular to bicycles with an auxiliary engine
US2469196A (en) * 1946-01-04 1949-05-03 Pioneer Gen E Motor Corp Magneto magnet
US2710929A (en) * 1951-01-18 1955-06-14 Russell E Phelon Magneto
US2912608A (en) * 1956-11-28 1959-11-10 Globe Union Inc Stator unit for flywheel magnetos
US2928962A (en) * 1955-07-06 1960-03-15 Wipac Dev Ltd Flywheel magnetos

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR719183A (en) * 1931-06-26 1932-02-02 Ruthardt & Co G M B H Lighting and ignition dynamo applicable in particular to bicycles with an auxiliary engine
US2469196A (en) * 1946-01-04 1949-05-03 Pioneer Gen E Motor Corp Magneto magnet
US2710929A (en) * 1951-01-18 1955-06-14 Russell E Phelon Magneto
US2928962A (en) * 1955-07-06 1960-03-15 Wipac Dev Ltd Flywheel magnetos
US2912608A (en) * 1956-11-28 1959-11-10 Globe Union Inc Stator unit for flywheel magnetos

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11363402B2 (en) 2019-12-30 2022-06-14 Comhear Inc. Method for providing a spatialized soundfield
US11956622B2 (en) 2019-12-30 2024-04-09 Comhear Inc. Method for providing a spatialized soundfield

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