WO2020041845A1 - Rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos - Google Patents
Rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos Download PDFInfo
- Publication number
- WO2020041845A1 WO2020041845A1 PCT/BR2018/050312 BR2018050312W WO2020041845A1 WO 2020041845 A1 WO2020041845 A1 WO 2020041845A1 BR 2018050312 W BR2018050312 W BR 2018050312W WO 2020041845 A1 WO2020041845 A1 WO 2020041845A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- poles
- rotor
- wedge
- detachable
- pole
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
- H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
Definitions
- the present invention belongs to the field of rotating electrical machines, in particular the means for assembling or attaching rotating magnetic parts to the rotor structures, notably the rotors with protruding poles.
- Electric rotating machines are equipment used for the transformation of electrical energy into mechanics, in the case of motors, and vice versa, in the case of generators. Basically, they consist of four basic structures, which are housing, stator, rotor and bearings / covers.
- the housing is the element responsible for the integration of the other structures, housing a stator and rotor.
- the stator is the active (energized) static component responsible for conducting the magnetic flux to rotate the rotor, in the case of motors, and to conduct the energy generated by the rotor, in the case of generators, while the rotor is the active component (energized) spinning of the spinning electric machine.
- the bearings and covers are the elements responsible for coupling the static parts to the rotating parts of an electric rotating machine.
- auxiliary systems such as those for excitation, cooling, lubrication, among others.
- the rotor system is constructed by assembling a machined shaft in a package that can be formed by stacked plates, a component in which the conductors, usually copper, are assembled, thus forming the active part of the rotor.
- This component can be classified as “cage” or “ring” when it is an alternating current induction electric rotating machine, or “smooth poles” or “protruding poles” when it is a synchronous rotating electric machine.
- the geometry with solid poles is composed of poles machined from a single block of metal.
- the geometry of laminated poles has two variations, the first being called integral laminated poles, which presupposes all poles belonging to the same plate, or with detachable laminated poles, which are produced separately from the rotor core and subsequently mounted on a component called a polar wheel which, in turn, is mounted on the rotor axis.
- the constructive form with detachable poles is usually used for rotating electrical machines with a large number of poles, such as, for example, large hydrogenerators, as it facilitates their manufacture.
- this geometry incorporates an interface region between the poles and the polar wheel in the project, and this contact region can lead to an increase in the magnetic losses of the rotor, thus worsening the electrical performance of the rotating electrical machine.
- This reduction in the cross section can also result in a reduction in the efficiency of the rotating electrical machine.
- the constructive option with integral sheets should, whenever possible, be preferred.
- Each second rotor segment has a second coiled pole rigidly attached to the first rotor segment in one of the respective first circumferential clearances, to form a plurality of second circumferential clearances between the wire of each first pole and the wire of the adjacent second pole, where the first and second rotor segments are configured to cooperate with each other to minimize the second circumferential clearance.
- each second rotor segment in relation to the first (polar wheel) occurs through alternating fitting elements in both segments, which form a kind of indentation with holes in each the axes of these holes are parallel to the longitudinal axis of the rotor.
- the holes in the indentations of each of the second segments coincide with the holes in the first segment.
- the attachment of each second rotor segment to the first is then done by inserting pins through the matching holes in the indentations.
- the first apparent disadvantage of the solution is the rigid connection between the detachable segments and the polar wheel, a connection referenced in US20160056676 descriptive report as being rigid and permanent (paragraphs 22 and 24 to 26), which does not allow disassembly in case of maintenance, preventive or corrective, a highly recommended and desired condition in the case of large machines, which require overhauls and, therefore, For reasons of cost, they must allow for the independent replacement of their components.
- Ways of fixing and locking the detachable poles on the polar wheel which allow the disassembly of the poles for their maintenance, may include the use of lower or lateral wedges, as well as the use of known mechanics solutions such as the swallowtail, which they bring the same limitations and problems of strangling the magnetic flux and loss of efficiency already mentioned, both in larger or smaller machines.
- One of the objectives of the present invention is, therefore, to provide a protruding pole rotor according to the characteristics of claim 1 of the attached claim table.
- Another objective of the present invention is to provide a corresponding rotating electric machine according to the characteristics of claim 8 of the attached claim table. [026] Other characteristics and details of the characteristics are represented by the dependent claims.
- Figure 1 shows an isometric perspective view of a detachable pole according to the invention
- Figure 2 shows a front view of the detachable pole of the figure
- Figure 3 shows an isometric perspective view of a polar wheel according to the invention, only with integral poles and without detachable poles;
- Figure 4 shows a front view of the polar wheel in figure 3;
- Figure 5 shows an isometric perspective view of a polar wheel according to the invention, in the final assembled state, with the detachable poles arranged between the integral poles;
- Figure 6 shows a front view of the polar wheel in figure 5;
- Figure 7 shows an isometric perspective view of a hybrid rotor according to the invention
- Figure 8 shows a front view of an enlarged detail of a detachable pole according to the invention
- Figure 9 shows a side view of the C-C section of figure 8, with a partial enlarged detail of a wedge and counter-set;
- Figure 9a shows the section of figure 9, showing the geometric and dimensional relationships of the different components
- Figure 9b shows the upper and lower wedges in isolation, showing their measurements
- Figure 10 shows an isometric perspective view of half of the polar wheel according to the invention, with the set of wedges mounted in the region of attachment of the detachable poles.
- the present invention relates to a hybrid rotor composed of a package (10), also called a polar core, arranged on an axis (20).
- the projecting poles or simply poles (30) of the package (10) are the elements on which the winding of conductive materials or simply a coil (40) is arranged.
- the poles (30) are arranged radially around the entire diameter of the package (10), alternating poles of the integral type (31) and poles of the detachable type (32).
- Each set of wedge and counter wedge (70) comprises an upper wedge (71) and a lower wedge (72), with at least one set of wedge and counter wedge (70) for each detachable pole, the use of at least being preferred. minus two sets of wedge and counter-counter (70).
- the lower wedges (72) are positioned in recesses (80) of the polar wheel (60).
- the lower wedge (72) has a length (I) whose dimension, parallel to the longitudinal axis of the axis (20), represents between 20 and 50% of the total length (L) of the package (10). [047] The insertion of the upper wedge (71) on the lower wedge (72) limited by the recess (80), guarantees the necessary force to keep the detachable pole (32) in its position and the maximum contact between the interface (90 ) of the detachable pole (32) and the cavity walls (50) of the polar wheel (60).
- the upper wedge (71) is positioned in such a way that it projects from the end of the package (10), in longitudinal dimension (D), parallel to the longitudinal axis of the axis (20), which corresponds to a value between 3 to 5 times its greatest thickness (F1).
- the upper wedge (71) must still be inserted into the cavity (50) of the polar wheel (60) maintaining an average interference of 0.05 to 0.9mm in its length, and should have an inclination ratio, preferably between 1: 90 and 1: 1 10, but not limited to that range.
- the clearance (E) between two upper wedges (71) is designed to accommodate the sum of the assembly and manufacturing tolerances of the detachable pole (32) and the package (10). Therefore, the clearance (E) can be determined as a function of the longitudinal dimension (D), being equal to or up to 50% greater than the longitudinal dimension (D).
- the dimension (H), which represents the linear distance between one end of the lower wedge (72) and the front face of the package (10), or the linear distance between the opposite end of the lower wedge (72) and the half the total length (L) of the package (10), is therefore half the difference between half the total length (L) of the package (10) and the length (I) of the lower wedge (72).
- the upper (71) and lower (72) wedges should be the same in terms of inclination ratio and flatness tolerances, as well as having the same greater thicknesses (F1) and (F2), differing only in length and smaller thicknesses (G1) and (G2). Due to geometric reasons, the smaller thicknesses (G1) and (G2) must be such that the smaller thickness (G1) will always be smaller than the smaller thickness (G2). Also, the thicknesses of the upper (71) and lower (72) wedges are related in such a way that the largest (F1) and (F2) and the smallest (G2) thicknesses will be determined and function of the minimum possible thickness for the smaller thickness (G1) that, according to the manufacturing processes, can be manufactured according to the desired flatness tolerances.
- a hybrid pole rotor solution (30) alternately comprising integral poles (31) and detachable poles (32), the latter being reversibly mounted on the polar wheel (60) by means of a wedge and counter-counter assembly (70), the wedges (71, 72) being removable and arranged in the lower region of the detachable poles (32), in order to remove the air gap between the detachable pole (32) and the polar wheel (60).
- the detachable poles (32) each have a geometry that favors the passage of the magnetic flux as it provides maximum contact between the detachable pole (32) and the polar wheel (60) through the contact region (90 ) with a contact dimension face (B) of the detachable pole (32).
- Such contact is amplified due to the combination of the two loads acting on the detachable pole (32): the first is exerted by the force that the wedge and counter-counter assembly (70) exerts by pushing the detachable pole (32) against the polar wheel (60) in the contact region (90) and, in nominal operation, the centrifugal force generated by the pole's mass acting in the same direction.
- the transverse dimension (A) represents the "throat" of the detachable pole (32), the region through which the electromagnetic flow from the coil (40) passes.
- the detachable poles (32) must be constructed in such a way as to guarantee a relationship between the dimensions (A, B) such that the contact dimension (B) is greater or equal half of the transverse dimension (A), without limitations as to ratios greater than 50%, and therefore cannot be less than this value under the risk of not obtaining the expected electromagnetic effect.
- the contact dimension (B) (represents the contact region (90) between the detachable pole (32) and the polar wheel (60).
- This region is therefore responsible for driving, on each side of the detachable pole (32), half of the total magnetic flux generated by the coil (40), so as the flux comes from the detachable pole (32) it passes through the area of the transverse dimension (A) and also passes through the areas of the contact dimension (B), it is necessary that the contact dimension (B) is at least half of the transverse dimension (A) .It is extremely important that the faces represented by the contact dimension (B) are in complete contact with the polar wheel (60), in its contact region (90) As mentioned earlier, the solution described here prioritizes this contact due to the efforts of the wedges (71, 72) and the centrifugal force of the rotation of the polar wheel (60).
- hybrid poles (30) can be laminated (formed by a stack of cut or stamped sheets) or solid (formed by a solid metal block), which represents another significant advantage in terms of flexibility of application of the present invention.
- the technician in the subject will understand that the hybrid pole rotor of the invention creates more stable conditions of production of the equipment, avoiding that process deviations cause reductions in the performance of the equipment, in addition to the increase of the manufacturing capacity, since with the same winding equipment can produce a rotor with twice the maximum number of poles foreseen for such equipment.
- the proposed solution considerably reduces the increase in rotor electrical losses inherent in the use of rotors with detachable poles, if comparable to the use of integral poles, by minimizing the space between the hybrid pole interface (30) with the polar wheel (60), a space called "air gap", which strangles the magnetic flux.
- the proposed solution expands the manufacturing capacity, making it able to manufacture rotors with a high number of poles without the need for new equipment.
- the solution called a hybrid rotor, consists of half of the integral poles (31) with the polar wheel plates (60) and the other half of the detachable poles (32). In this way, it is possible to avoid the appearance of empty spaces in the interfaces of the detachable ones with the integrals (90) using the wedge system (70) to fix those in these, keeping the passage area of the magnetic flux constant, and so avoiding bottlenecks.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2018/050312 WO2020041845A1 (pt) | 2018-08-31 | 2018-08-31 | Rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos |
BR112021003810-8A BR112021003810A2 (pt) | 2018-08-31 | 2018-08-31 | rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/BR2018/050312 WO2020041845A1 (pt) | 2018-08-31 | 2018-08-31 | Rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2020041845A1 true WO2020041845A1 (pt) | 2020-03-05 |
Family
ID=69643416
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/BR2018/050312 WO2020041845A1 (pt) | 2018-08-31 | 2018-08-31 | Rotor de polos híbridos para máquina elétrica girante de polos salientes e máquina elétrica utilizando os mesmos |
Country Status (2)
Country | Link |
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BR (1) | BR112021003810A2 (pt) |
WO (1) | WO2020041845A1 (pt) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021233724A1 (de) * | 2020-05-20 | 2021-11-25 | Voith Patent Gmbh | Rotor für eine elektrische maschine |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3673816A (en) * | 1971-03-05 | 1972-07-04 | Jones & Laughlin Steel Corp | Coupling arrangement |
US3877828A (en) * | 1973-08-06 | 1975-04-15 | Robert F Smith | Machine key |
US4160180A (en) * | 1978-07-12 | 1979-07-03 | Vinogradov Evgeny N | Rotor lamination support for vertical hydro-generator |
US20040164639A1 (en) * | 2003-02-26 | 2004-08-26 | Asmo Co., Ltd. | Core having axially assembled core sub-parts and dynamo-electric machine member having the same |
US20160056676A1 (en) * | 2014-08-25 | 2016-02-25 | GM Global Technology Operations LLC | Partially segmented wound rotor assembly for high copper fill and method |
-
2018
- 2018-08-31 WO PCT/BR2018/050312 patent/WO2020041845A1/pt active Application Filing
- 2018-08-31 BR BR112021003810-8A patent/BR112021003810A2/pt unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3673816A (en) * | 1971-03-05 | 1972-07-04 | Jones & Laughlin Steel Corp | Coupling arrangement |
US3877828A (en) * | 1973-08-06 | 1975-04-15 | Robert F Smith | Machine key |
US4160180A (en) * | 1978-07-12 | 1979-07-03 | Vinogradov Evgeny N | Rotor lamination support for vertical hydro-generator |
US20040164639A1 (en) * | 2003-02-26 | 2004-08-26 | Asmo Co., Ltd. | Core having axially assembled core sub-parts and dynamo-electric machine member having the same |
US20160056676A1 (en) * | 2014-08-25 | 2016-02-25 | GM Global Technology Operations LLC | Partially segmented wound rotor assembly for high copper fill and method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2021233724A1 (de) * | 2020-05-20 | 2021-11-25 | Voith Patent Gmbh | Rotor für eine elektrische maschine |
Also Published As
Publication number | Publication date |
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BR112021003810A2 (pt) | 2021-05-18 |
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