Closing system between a cap and a stator in an electric machine, process for closing between a cap and a stator in an electric machine and stator for an electric machine
Inactive Publication Date: 2018-09-13
WEG EQUIP ELETRICOS SA
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- Abstract
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- Claims
- Application Information
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Benefits of technology
The present invention provides a closure system between the cap and stator in a rotating electric machine. This is achieved through the use of a polymer injected through a through-hole in the cap into the inner wall of the closure hole in the stator. The stator may also have at least one recess in the inner wall of the closure hole. The cap may also have a rolling bearing receiving portion for receiving a rolling bearing. The closure process involves aligning the cap with the stator and injecting the polymer. The technical effect of this invention is improved sealing and reduced leakage of fluid in the rotating electric machine.
Problems solved by technology
In addition to the matter of concentricity in the assembly, the riveting process itself can cause shifts of the blades of the stator package due to buckling of the rivets and / or reinforcements under the package during the pressing operation needed for the attachment.
That is, the buckling of the rivet can cause its lateral displacement towards the blade package, moving the blades towards the rotor and reducing the machine air gap.
Additionally, the efforts needed to deform the rivets compromise the correct positioning of the cap since the absorption of forces exerting lateral efforts may displace the cap from the correct position.
Method used
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[0034]The present invention will be described hereinafter based on examples of preferred embodiments shown in FIGS. 1 to 7.
[0035]FIGS. 1, 2 and 7 the stator and caps assembly of a rotating electric machine. FIGS. 1 and 2 show the assembly in the closed position, and FIG. 7 schematically shows the upper cap being engaged for closure.
[0036]FIG. 1 shows a stator core 1 formed mainly by a plurality of stator blades. The detailed construction of this kind of stator is known to those skilled in the art and will not be discussed here.
[0037]The stator is preferably manufactured of steel, but other materials could be used. As better shown in FIGS. 2 and 7, the stator has at least one region with a closure hole 1a. The closure hole 1a defines a substantially tubular inner wall 1b. Preferably, the stator has four closure holes 1a, and each hole is disposed spaced from one another, for example, at the corners of the stator 1.
[0038]Naturally, when the stator has non-rectangular blades, the holes...
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A closure system between the cap and the stator in an electric rotating machine, wherein the stator (1) comprises at least one closure hole (1a) defining an inner wall (1b). The cap (2) comprises at least one contact portion (2a), the end of the contact portion comprising at least one through-hole (2c); the through-hole (2c) being substantially aligned with the closure hole (1a) when the end of the contact portion (2a) contacts the stator (1); and wherein a polymer (P) is injected through the through-hole (2c) in the inner wall (1b) of the closure hole. In the closing process of the present invention, the concentricity between the rolling bearing and the stator rotor accommodating bore is ensured by the fact that the geometry of the rolling bearing receiving portion (2e) allows the alignment to be made on the basis of the outer race (E) of the rolling bearing when it is already accommodated in the receiving portion (2e).
Description
FIELD OF THE INVENTION[0001]The present invention relates to a closure system between the caps of an electric machine and a stator of an electric machine.BACKGROUND OF THE INVENTION[0002]Rotating electrical machines are widely known in the art, and basically comprise a static part (stator) and a rotating part (rotor). In a simplified manner, the stator comprises a plurality of plates stacked and pressed to form a block or package, known as the stator core. These plates are commonly called stator blades,[0003]In some constructions of electric machines, the caps of the electrical machine are attached to the stator block by rivets. This construction requires a careful observation of the concentricity between the cap and the stator, so that the assembly is achieved within a suitable tolerance threshold.[0004]In addition to the matter of concentricity in the assembly, the riveting process itself can cause shifts of the blades of the stator package due to buckling of the rivets and / or rei...
Claims
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Login to View More IPC IPC(8): H02K5/15
CPCH02K5/15F16C27/04F16C35/042F16C35/077F16C2380/26H02K15/12H02K15/14F16C25/08F16C37/007F16C2300/32H02K5/1672H02K5/1732
InventorZANGHELINI, MAURICIO
OwnerWEG EQUIP ELETRICOS SA