Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1997-04-30
1999-07-20
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310181, 310198, 310206, 310269, 310 49R, H02K 100
Patent
active
059259590
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a multi-poles magneto electric generator having special windings, and is particularly adaptive for frequency-changeable generators.
BACKGROUND ART
The electric generators of the prior art have some deficiencies, such as low effective flux due to the large winding slots of the armature core; high internal resistance of the coil; high power consumption, resulting in temperature rising easily; long and overlapped end of the stator windings; high eddy loss of the rotor and so on, which cause the restrictions on power output, materials cost, and size of the electric generator, consequently limit its application.
DISCLOSURE OF THE PRESENT INVENTION
The object of the present invention is to provide a novel electric generator which has smaller size, higher power output and saves the materials to build it.
The present invention is an improvement to the structures of the stator and rotor of a conventional generator. The sections of the stator winding slots are rectangular shape and the sections of the teeth are sectorial shape, thereby the effective area of the armature core is increased and the total effective flux rises. The stator windings are comprised of square-wave open rings with different pitches, so that the lengths of the end windings are decreased, and a lower internal resistance can be obtained. Magnet poles are laid on the magnet yoke of the rotor, and slits extending axially along the rotor are formed in the magnet poles and the magnet yoke. By means of these slits the iron loss of the generator decreases and using efficiency increases. The number of the stator slots and teeth is a multiple of 3, and the number of the teeth is a multiple of 3 times as much as the number of the magnet poles. The distance between each two adjacent magnet poles laid on the rotor surface equals to the width of one slot on the stator. The thickness of the magnet poles laid on the rotor surface is equal to 7-8 times as much as the width of the air gap between the rotor and stator. The magnet poles are fixed to the rotor surface with adhesive. The two ends of each of the magnet poles laid on the rotor are formed into wedge shape and tightly held by wrap-edges of the rotor, and the portion held by the wrap-edges is not greater than a quarter of the pole thickness. The length of the slits extending axially in the magnet poles and the yoke of the rotor is longer than a half of the axial length of the magnet pole. The width of the slits extending axially in the magnet poles and the yoke of the rotor is 0.1 mm. Three branch windings belong to one set of windings corresponding to a pair of opposite magnet poles are arranged to embed in their respective slots on the stator with different pitches as: crossing 5 teeth then crossing 1 tooth; crossing 3 teeth then crossing 3 teeth; and crossing 1 tooth then crossing 5 teeth. Each 12 slots on the stator form a minimum unit. The windings between the units can be connected in series, parallel or series-parallel mode. A plurality of winding sets overlapped in multiple layers are embedded in the stator slots at a same position and the windings thereof can be connected in series, parallel or series-parallel mode. With their respective displacement the three-phase windings are embedded in their respective slots of the stator. The winding arranged in each layer in each slot of the stator comprises a single conducting wire.
Compared to the prior art, the present invention has the advantages such as: smaller size, simpler manufacture process, saving on materials, and higher generator efficiency etc.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic sectional view of the generator of the present invention.
FIG. 2 is a schematic developed view of the stator windings of the present invention.
FIG. 3 is a schematic structural view of the rotor and its magnet poles of the present invention.
PREFERRED EMBODIMENTS OF THE PRESENT INVENTION
As shown in FIG. 1, the present invention comprises two major parts: stator 1 and rotor 5. The sect
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patent: 3218494 (1965-11-01), Bacon et al.
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patent: 4541575 (1985-09-01), Dickerson
patent: 4746827 (1988-05-01), Ochiai et al.
patent: 5128570 (1992-07-01), Isozaki
Chen, Shikun, Electrical Generator Design, vol. 2, pp. 95-96 (Jun. 1982).
Bai Xiabin
Ren Hongchang
Wang Bin
Ye Nianguo
Zhang Xibin
Bai Xiabin
Lam Thanh
Stephan Steven L.
Zhang Xibin
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