Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-29
2001-04-17
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S201000, C310S208000
Reexamination Certificate
active
06218754
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to the field of electrical engineering, and more exactly, to electric motors of a submersible pump with a large length-to-diameter ratio.
BACKGROUND OF THE INVENTION
During the development of wells, in particular oil wells, submersible pump units are used which are equipped with a drive, the dimensions of which should not exceed the diameter of the well. The electric motors usually used as power drives of submerged units, taking this requirement into account, have a large length-to-diameter ratio.
An electric motor is known which comprises a body, with a laminated stator core arranged therein, in the slots of the tooth zone of which multiturn sections of a two-layer winding are disposed with face parts and a rotor spaced from the stator. In that construction the sections of the two-layer winding are disposed in slots open from the side of the face, wherein the sections may be formed by turns of wire that has a round or rectangular cross section depending on the power of the machine (V. V. Dombrovsky, G. M. Khutoretsky, “Basics of Designing Alternating Current Motors,” Leningrad, Energiya, 1974, p. 349, FIGS. 8-29).
However, when there is a large ratio of the length of the electric motor to the diameter (L/d≧10), it is impossible in practice to make a winding of sections laid into slots from the side of the gap.
A submersible electric motor for a pump is also known, which includes a body, with a laminated stator core arranged therein, in the slots of the tooth zone of which multiturn sections of a two-layer winding are disposed with face parts, and a rotor spaced from the stator (prospectus of the “Konnas” firm—Submersible electric motors).
This motor has a large length-to-diameter ratio, which excludes the arrangement of a two-layer winding with preliminary formed multiturn sections in the slots of the tooth zone of a laminated core. In such a motor the sections of the winding are made of round wire by the method of broaching through slots. However, when wire with a round cross section is used the filling factor of the winding in the slot is small (the ratio of the cross section of copper to the cross section of the slot), which is accompanied by an increase of the weight and size of the motor, a relatively large thickness of the layer of impregnation compound is required, which increases the thermal resistance for losses in the copper and makes the release of heat into the environment more difficult.
The method of assembling a motor by broaching wire through a slot, including forming sections of the winding directly in the slot, results in the necessity for rewinding in the case of insufficient electrical strength or damage to the insulation, and also makes the step of laying slot insulation more difficult.
SUMMARY OF THE INVENTION
The object at the base of the invention is to create an electric motor for a submersible pump, the construction of which would make it possible, with a large ratio of the length of the motor to its diameter, to preliminarily form sections of a two-layer winding of the stator and to arrangement it in the slots of the tooth zone of the core as already formed sections, which would make it possible to enhance the filling factor of a slot and, consequently, reduce the size and weight of the electric motor, and also to increase the productivity of submersible pumps with an electric drive in small diameter wells.
The stated object is achieved in an electric motor of a submersible pump, which includes a body, with a laminated stator core arranged therein, in the slots of the tooth zone of which multiturn sections of a two-layer winding are disposed with face parts, and a rotor spaced from the stator, in that in accordance with the invention, the stator core comprises two parts, an inner part including a tooth zone with slots open to the side of the periphery of that part, and an outer part encompassing the inner and being an annular yoke, each section of the stator winding has a substantially square cross section and is formed by turns of wire of substantially rectangular cross section, the turns lying adjacent each other along their large surfaces, wherein a first and second side of each section are positioned in different layers of the two-layer winding so that in each slot the large surfaces of the turns in the first and second layers of the winding are oriented mutually perpendicular, and the height of the face parts does not exceed the height of the slot.
The concept “substantially square cross section” within the limits of this invention is considered as a cross section selected taking the following relationship into account:
h
=(0.9−1.1)
b,
wherein h is the height of the cross section of the section,
b is the width of the cross section of the section.
The concept “substantially rectangular cross section” assumes any cross section, the length of two opposite sides of which exceeds the length of the two other opposite sides of that cross section.
REFERENCES:
patent: 1799021 (1931-03-01), Parsons et al.
patent: 2085099 (1937-06-01), Jones
patent: 2333575 (1943-11-01), Kilgore et al.
patent: 3590301 (1971-06-01), Woydt
patent: 3979618 (1976-09-01), Auinger
patent: 4350911 (1982-09-01), Wilson et al.
patent: 679173 A5 (1991-12-01), None
patent: 42 34 129 C2 (1994-05-01), None
patent: 1070344 (1967-06-01), None
patent: 2 140 629 (1984-11-01), None
patent: 2030058 (1995-02-01), None
patent: 2083047 (1997-06-01), None
patent: 1046847 (1983-10-01), None
Bukhalenko, E.I. Ed.Oil-Field Equipment, Manual, 2ndedition, Moscow, “Nedra” 1990.
Alekperov Vagit Jusufovich
Bezzubov Alexandr Vasilievich
Graifer Valery Isaakovich
Klochkov Oleg Grigorievich
Lesnichy Vitaly Fedorovich
Dinh Le Dang
Nath Gary M.
Nath & Associates PLLC
Novick Harold L.
Otkrytoe Aktsionernoe Obschestvo Neftyanaya Kompania “Lukoil”
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