Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1995-06-20
1997-08-05
Dougherty, Thomas M.
Electrical generator or motor structure
Dynamoelectric
Linear
310 24, H02K 4100
Patent
active
056545967
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates in general to an electrodynamic machine and a method of using it. More particularly, the invention relates to a homopolar permanent magnet linear electrodynamic alternator and method of using it in a highly efficient and effective manner.
The present invention further relates in general to an improved electrodynamic machine and methods of using and constructing it. The invention more particularly relates to a linear electrodynamic machine and a method of constructing it in a cost effective and efficient manner.
2. Background Art
There have been many different types and kinds of electrodynamic machines for generating electrical currents. For example, reference may be made to the following U.S. Pat. Nos. 2,842,688; 3,022,450; 3,103,603; 3,136,934; 3,247,406; 3,259,769; 3,292,065; 3,323,793; 3,351,850; 3,366,809; 3,422,292; 3,441,819; 3,500,079; 3,542,495; 3,816,776; 3,891,874; 4,198,743; 4,210,831; 4,395,649; 4,445,798; 4,454,426; 4,542,311; 4,546,277; 4,602,174; 4,623,808; 4,642,547; 4,697,113; 4,924,675; 4,937,481; 4,945,269 and 5,136,194.
As disclosed in the foregoing patents, electrodynamic machines in the form of linear generators or alternators, generally include a stator having a predetermined number of magnetic poles for producing magnetic fields, and a mover which travels reciprocatively linearly relative to the poles. The magnetic fields are typically produced by electromagnets or permanent magnets. As the mover travels, electrical current is typically induced in the stator windings.
While such linear generators and alternators have been satisfactory for some applications, they have been relatively inefficient, due to unwanted and undesirable heat and power losses. For example, when permanent magnets are employed on the mover, heat generated by the magnets radiate radially into the machine windings, thus significantly reducing the efficiency of the operation, due the heat build-up and attendant losses.
Therefore, it would be highly desirable to have new and improved electrodynamic machine, which greatly reduces heat losses, and which is highly efficient in its operation.
Another problem associated with such prior art machines is the loss of kinetic energy from oscillating the mover relative to the stator poles. For example, the windings and permanent magnets disposed on the prior known mover are undesirably heavy. Thus, energy is wasted to reciprocate the mover, due to the excessive weight of the mover itself.
Therefore it would be highly desirable to have a new and improved electrodynamic machine, which greatly reduces the amount of energy required to reciprocate the machine mover.
Such a machine should be highly efficient and effective in its operation. Also, it should be relatively less expensive to manufacture.
It would also be highly advantageous to increase the thrust per unit weight of the machine. Such an increased power density would permit the unit to have a wider range of applications. For example, such an improved machine could be utilized for applications requiring compact configurations and where weight is a factor. Such applications can be not only linear motors and alternators, but also vibrators and actuators, such as vehicle door lock actuators. Also, where space is limited, such compact applications could include linear motors and vibrators for refrigerator compressors.
Thus, it would be highly desirable to have a new and improved linear electrodynamic machine and method of making find using it, wherein the machine would be relatively inexpensive to manufacture. Such a machine should be highly efficient by having a high thrust to weight ratio, so that it can be utilized in a wider range of applications.
DISCLOSURE OF INVENTION
Therefore, the principal object of the present invention is to provide a new and improved linear electrodynamic machine, and method of using it, whereby losses are greatly reduced to enable it to be more efficient in its operation.
Another object of the present invention is to provide such a n
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Boldea Ion
Nasar Syed A.
Dougherty Thomas M.
Kleinke Bernard L.
Link Jonathan
Scott Peter P.
Stirling Technology Company
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