JPH0635652Y2 - Core retainer plate for semi-finished stator that separates cutting chips - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention generally relates to an electric motor, and more particularly, to a core of a semi-finished stator for cutting continuous cutting chips generated by a lathe or the like on an end face of a core holding plate of a stator. Regarding the structure of the holding plate.

[Prior Art] The dimension between the end portions of the core holding plates on both side surfaces of the core of the stator of the electric motor or generator is often required to be accurate depending on the mounting location of the stator. The error is large. Therefore, at least one core holding plate of the semi-finished stator product is preliminarily thickened and processed into a predetermined size. As shown in FIGS. 4 and 5, in order to machine the end surface portion 2'of the core pressing plate 6'of the conventional stator 1, the stator semi-finished product is held on a lathe and is rotated around the axis X-X. It has been common to use a chip breaker that rotates and turns the end face portion 2 with a cutting tool, and that has a groove or step behind the cutting tool chip.

[Problems to be Solved by the Invention] As shown in FIG. 4, usually a plurality of (four in this example) bolt fastening holes are provided near the outer periphery of the end face portion 2'of the core pressing plate 6 '. However, inside the tightening hole 4, there is a continuous flat ring-shaped portion 3 (shown by diagonal lines) without holes or grooves and a non-machined portion on the radially inner end side, and the cutting work is performed outward. When the cutting tool extends inwardly from this to reach the annular portion, continuous chips are generated.

Even if a chip breaker is used, it is impossible to completely cut such continuous chips, and long chips will wind around the cutting tool holder or cutting tool and scrape the cutting surface, or between the cutting tool and the processing surface. However, there remains a problem to be solved, such as being sandwiched between them and damaging the machined surface, impairing the smoothness of the machined surface, and continuous chips being wound around the coil 5 and breaking and damaging the coil surface coating.

[Means for Solving the Problems] At least one of the core pressing plates of the stator according to the present invention has an end face portion which is formed at a radius from the working width to the continuous annular portion inside the bolt tightening hole of the core pressing plate to be processed. A hole having a diameter less the radial width of the non-machined portion on the inner side in the direction, the diameter of the bolt tightening hole and the radial width of the outer peripheral edge portion, or having a radial width of the aforementioned dimension. A structure having a plurality of discontinuous portions formed by arc-shaped grooves (hereinafter simply referred to as grooves) defined by two arcs that are concentric with the core pressing plate, and the chips generated by this are divided one after another. By doing so, the above problems were solved.

[Operation] When the end face of at least one core pressing plate of the stator is machined, the vicinity of the outer periphery is discontinuous due to a plurality of bolt tightening holes, and the part inside this tightening hole is
Due to the discontinuity formed by a plurality of holes or grooves according to the present invention, the cutting chips are divided and are not continuous, and therefore are not wound around the bite holder or the bite tip or caught between the bite tip and the processing surface. Since the processed surface is not damaged and is not wound around the coil, the surface coating of the coil is not damaged.

[Embodiment] Referring to FIG. 1 and FIG. 2, a plurality of (four in this embodiment) bolts are provided near the outer periphery of a core holding plate 6 at the end of a stator core 7 of a semi-finished product of a stator 1 of an electric motor. A tightening hole 4 is provided.

On the end face portion 2 of the holding plate 6, a ring-shaped portion 3 (shaded portion) geometrically inscribed in the tightening hole 4 and excluding a non-machined portion on the inner end side in the radial direction is drawn. The annular portion 3 is provided with a plurality of holes 8 (four in this example) having the same diameter as the radial width of the annular portion 3. It is preferable that the holes are formed in the semi-finished product before assembling the holding plate 6 to the stator by making holes at equal intervals in the circumferential direction of the annular portion 3.

FIG. 3 shows another embodiment in which an arc-shaped groove 9 is provided in place of the hole 8 in FIG. 1, and the radial width of the arc-shaped groove 9 is equal to the radial width of the annular portion 3. The same as the hole 8 described above.

[Advantages of the Invention] When the stator 1 is attached to a lathe, and the end face portion 2 of the core pressing plate 6 is cut by a turning tool by rotating around the axis line XX of the stator, a bolt tightening hole 4 is formed around the outer periphery thereof. Since the cutting chips are divided by the holes 8 or the grooves 9 according to the present invention and are not continuous in the vicinity of the inner circumference, the cutting chips do not wind around the bite holder and the bite chip, and also between the bite chip and the machined surface. Since it is not sandwiched, it does not damage the machined surface or wind around the coil, so there is no risk of damaging the coil surface coating.

[Brief description of drawings]

FIG. 1 is a side view showing a state before cutting of a semi-finished stator product having a core holding plate with holes according to the present invention, and FIG. 2 is a partial sectional view taken along line II-II after cutting the stator shown in FIG. Third
FIG. 4 is a side view of another embodiment in which grooves are provided instead of holes, and FIG. 4 is a side view of a semi-finished stator product having a conventional core holding plate.
FIG. 5 is a partial view taken along the line VV of FIG. Explanation of symbols 1 ... Stator, 2 ... End face part, 3 ... Ring part, 4 ...
… Bolt tightening holes, 5 …… Coil, 6 …… Core holding plate, 7
... stator core, 8 ... hole, 9 ... groove.

Claims (1)

[Scope of utility model registration request] 1. A non-machined portion on the radially inner end side of the core retainer plate is provided in an annular portion inscribed in a bolt tightening hole in an end face portion of the core retainer plate of at least one of the stator of the electric motor or the generator. Excludes the difference between the radially machined width from the outer edge of the core retainer plate to the inward direction, minus the diameter of the bolt tightening hole in the end face of the core retainer plate to be machined and the radial width of the outer peripheral edge of the core retainer plate. When cutting the end face portion, there are provided a plurality of discontinuous portions formed by holes having diameters corresponding to the above, or arcuate grooves having a short diameter in the radial direction corresponding to the difference. A core retainer plate for a semi-finished stator, which is characterized in that cutting chips generated on the core are easily separated.