Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-11-17
2001-11-27
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S156550, C310S156640
Reexamination Certificate
active
06323572
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnet type electric motor and generator and in particular to in a magnet type electric motor and generator a magnetic pole structure is constituted to obtain an output improvement, an output adjustment and an efficiency improvement, etc, of the magnet type electric motor and generator.
Up to now, in a conventional magnet type electric motor and generator, a magnet arrangement is a cylindrical shape, or magnets are formed by magnetizing a disc-like shape material, or separation magnets are used by arranging with a circumferential shape. Accordingly, the magnetic field of an air gap formed between a rotor and a stator is influenced by the magnetic force of the magnet and, as a result an output and an efficiency of the magnet type electric motor and generator are determined naturally.
Recently, under a resource saving and an energy saving, it is desired strongly a high efficiency and a resource saving in the magnet type electric motor and generator technical field but there is not appear a satisfied technique up to now. Further, there is a problem that a strong magnetic flux magnet, for example, which is exemplified by a neodymium magnet, is performed recently before the footlights and such a magnet is very high cost in comparison with a ferrite magnet and has a limitation for the purpose aspect and at the same time has a limitation for the resource aspect.
Accordingly, in the present invention, it has paid to an attention in which an improvement in the magnetic flux density of an air gap portion formed between a rotor and a stator in the magnet type electric motor and generator relates directly to the performance improvement.
SUMMARY OF THE INVENTION
The objects of the present invention are to solve the problems in a magnet type electric motor and generator, which are (1) an arrangement of magnets for increasing the magnetic flux of an air gap, (2) a concentration of the magnetic flux to an air gap, and (3) a shape and a productivity of an iron core structure, etc.
The means for solving the problems to attain the above stated objects of the present invention will be explained in order.
(1) The Arrangement of the Magnet for Increasing the Magnetic Flux of the Air Gap
To attain the magnetic flux increase of the air gap, there are one case in which it is carried out using a single magnet every magnetic pole and another case in which it is carried out by combining plural magnets every magnetic pole.
First of all, the case of the single magnet will be explained. A radial shape slit for inserting the magnet is provided on a respective iron core, and the magnet can be adjusted in a radial direction, in particular when the magnetic flux is formed to strengthen, a strong magnetic flux magnet or a magnet being fully inserted to the slit in the radial direction is used.
Further, by employing a structure in which the magnet can be attached to and detached from the slit, it is possible to carry out an alternation and an adjustment of the characteristics of the magnetic type electric motor and generator.
Next, in the case of the single magnet, since there are limitations about the structure and the magnetic force, the magnetic force of the air gap is tried to strengthen further, the combination of plural magnets is used every magnetic pole, or a length of the slit to the axial direction is formed longer than a length of an axial direction of the stator (a length of the iron core).
Or it is utilized an empty space enable to put to a practical use, accordingly it is possible to carry out effectively the increase in the magnetic flux of the air gap.
Further, when the empty space has a limitation, a three-dimensional space of the magnetic pole is put effectively to a practical use, and to a whole face or to a part of the face of the three-dimensional space the magnet is arranged organically and the magnetic flux can be concentrated and can be increased to the air gap portion.
(2) The Concentration of the Magnetic Flux to the Air Gap
In a case where the radial shape slit for inserting the magnet is provided on the iron core of the respective magnetic pole, it is possible to carry out that the radial direction length of the slit is formed longer than the circumferential length per one magnetic pole of the air gap portion or it is carry out the length of the iron core for inserting the magnet is formed longer than the axial direction length of the stator, etc., accordingly the magnetic force of the magnet's own can be strengthened.
Namely, it is necessary to form long the axial direction length of the iron core to have the area of the magnetic generation side of the magnet more than ½ (half) against a facing area of the stator to the rotor per one magnetic pole.
To attain above, the iron core of the respective magnetic pole is formed with a complete separate structure or an incomplete structure in which the necessary minimum combination of the iron cores is confined mechanically or the combination is formed using the non-magnetic body etc. Accordingly, it is essential to not leak as soon as possible the magnetic flux except for the air gap. It is one manner in which the constitution members except for the iron core are unified using almost non-magnetic bodies.
(3) The Shape and the Productivity of the Iron Core
In ordinary in a case of a mass production the iron core is generally to comprise an integrated structure. However, to form effectively the concentration of the magnetic flux of the air gap the iron core is formed with the separation structure every the respective magnetic pole. Further, the rotor iron core and the stator iron core, both have different axial direction lengths, are not suited economically for the integration production, it is necessity to employ an individual production according to the separation structure of the iron core.
Further, the magnet insertion iron core has the constant magnetic field and as a material for the iron core a high cost material such as a thin silicon steel plate of the winding iron core is unnecessary but a block material such a thick plate and a cast body can be used, and in the latter case accordingly it is profitable from a cost aspect.
REFERENCES:
patent: 4405873 (1983-09-01), Nondahl
patent: 4618792 (1986-10-01), Yates
patent: 5371426 (1994-12-01), Nagate et al.
patent: 5955807 (1999-09-01), Kajiura et al.
patent: 6025667 (2000-02-01), Narita et al.
patent: 6037691 (2000-03-01), Akemakou
Antonelli Terry Stout & Kraus LLP
Dinh Le Dang
Ramirez Nestor
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