JPH03501919A - Laminated stator for electric machines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Laminated stator for electric machines The present invention relates to an electric machine, and particularly to a stator comprising a plurality of pairs of magnetic pole pieces and yokes. Concerning technology for manufacturing and assembling.

1. An interleaved aspect to constitute a yoke having a generally tubular shape. It is known to manufacture laminated stators from laminar segments arranged in a lamina.

In known implementations, the tubular shape is octagonal, with each of the eight legs of the octagon The internally laminated pole pieces may be keyed or otherwise attached thereto. General There are always two pairs of main pole pieces and four counterpoles. However, more Other arrangements with several pairs of magnetic poles are also possible.

Although manufacturing with interleaving techniques can achieve reasonably efficient utilization of materials, Assembly of interleaved stacks of layers is inconvenient and relatively expensive; Usually requires welding.

Moreover, existing designs favor the use of round wires for the winding of the magnetic field of machines. Not enough space provided for use.

Assemble the yoke from a circular stack by drilling holes in the yoke and using screw attachments. It is known to fabricate and fix the pole pieces of the main pole and the counterpole. deer However, there is poor use of materials and the cost of assembly is relatively high.

The general purpose of this invention is to provide a laminate for electric machine laminate yokes and pole pieces. The purpose is to provide manufacturing and assembly technology. Manufacturing versatile motors facilitates substantial economic savings in motor assembly and performance Providing techniques that facilitate improvement is a preferred objective.

Summary of the invention In one aspect of the invention, an electric stator is provided for each of the similar stacks. Multiple yoke segments made up of stacks, each with similar laminations. a plurality of magnetic pole pieces constituted by each stack; The pole pieces are designed so that successive yoke segments are mutually compatible with each pole piece and have complementary portions such that they are bonded by this.

Preferably the yoke segments define the yoke polygonally. Its segments are many They may be joined by respective pole pieces at the corners of the rectangle. Alternatively, that segment may be joined by respective pole pieces placed in the center of alternating legs of the polygon. . This structure reduces the space available for winding the round wire around the pole piece. become maximum.

Each yoke segment may include a plurality of straight, parallel-sided legs, and the segments The inside of the ment is substantially complementary to its outside.

Each pole piece receives a complementary end portion of a yoke segment and defines a dovetail portion may include a pair of angled slots. The slots have parallel sides and It may be symmetrical about the centerline of each pole piece.

The invention also provides a method of manufacturing electric stators, each of which forming a plurality of first laminates having a cross-section of cross-sections; forming a plurality of second stacks each corresponding to a cross-section of the pole piece; complementary laminates such that the laminates of the two yokes can act as connectors for the laminates of the two yokes. forming first and second laminates having a path; and forming a step in each laminate. Constructing and forming a plurality of yoke segments and a plurality of pole pieces from tacks. yoke by magnetic pole pieces alternating with yoke segments in a closed magnetic circuit. connecting the network segments.

A particular pole piece stack has a tip portion with an arched edge and two generally flat tip portions. The part of the handle that has a straight edge and the inner part symmetrically about the center line of the handle and from the end part. a terminal portion including two opposing slots angled toward the slot; The cut defines a dovetail portion at the terminal portion. Multiple laminates for a given yoke segment can include generally straight, parallel-sided legs of a laminate, such as two The longer sides are substantially complementary and there is a yoke segment near each end. parallel to the access of the symmetrical part of the stack and (≠ symmetrically inclined to it) It has a recess that defines a terminal end portion.

Drawing description Figure 1 is a plan view of the stator section of the electric motor, showing the mutually compatible yokes. Figure 2 shows an alternative stator to that shown in Figure 1. FIG. 2 is a plan view of the embodiment, and FIG. 3 shows in detail a pole piece according to a second embodiment of the invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Figure 1 shows the stator part, that is, the yoke and magnetic poles of a four-pole DC motor. The pieces are shown in plan or end view.

The stator 1 is laminated and in its fully assembled form consists of four layers of yokes 2 A non-interleaved stack of 3 and 4 non-interleaved stacks of main pole piece stacks. A stack of electrodes and preferably a stack of four non-interleaved stacks of interleaved electrodes. It consists of The commutating poles and the manner in which they are fixed to the stack 2 of the yoke are as follows. Although not important to the invention, they were used in direct current machines to assist in rectification. is included here because it is common to provide such spacing.

Each of the segment yoke stacks 2 is preferably straight and has an inner side 5 and an outer side 6. including multiple legs (2as2bs and 2c) defined between each The segments are parallel and matching over substantially their entire length. this The advantage of fabricating the segments in this manner is that they are made of suitable metal sheet struts. The point is that it can be cut from the lip without much waste.

The dovetail-shaped portion of the commutative pole 4 is engaged with the inner side of the central portion 2b of the stator segment 2. There is a drumstick-shaped depression 7 for this purpose.

The dovetail-shaped depressions are aligned along lines 8 radial to the stator axis and their segments There is a dovetail-shaped portion 9 on the outside of the hole.

In addition to this drumstick-shaped part, there are also drumstick-shaped ridges that run vertically along the outside of the yoke. It can be used to form and secure the yoke within the frame. Preferably a drumstick-shaped depression It is to be understood that the groove 7 and the dome-shaped portion 9 are of corresponding shape.

At the appropriate location (or locations), this is the lamination of each segment in this example. The opening 10 is located in the center of the central portion 2b of the . This opening is the same is capable of aligning with the corresponding opening of a segment in the stack of one laminate and Used to accept stakes or plugs to secure the laminates together in a stack. Ru.

The yoke stack 2 has an end side surface 11 . These two sides are on top of each partial laminate. to facilitate stamping from lean strips. It's convenient. At each end the yoke laminate has a recess 12 with sides 13 and 14. This will be explained later.

An important feature of the invention is that the pole piece fits between two consecutive yoke segments. and points arranged to connect them. The lamination of each pole piece is It has a curved side surface 15, which forms part of the pole face. Lamination of pole pieces is preferable. has generally parallel sides 16 and 17. At its outer end, the pole piece A stack of layers is formed with a dovetail-shaped portion 18. This drumstick-shaped part is a drumstick-shaped part. 9 is used to secure the yoke to the machine framework in a manner similar to that used. The outer, smaller dovetail-shaped portion 19 may be retained.

When each laminate stack is assembled, the sides of the main dovetail section will corresponds to and closely abuts the side surface 11 of the stack.

Preferably, the stacking of each pole piece is on each side of the dovetail portion and on one side in the positive direction of the dovetail portion. side 16 or 1 of the stack of pole pieces parallel to the side of the plane and the other side depending on the circumstances. A slot 21 formed between each triangular lip 22 which is a continuation of 7. An indentation is made adjacent to the drumstick part so that there is a This lip 22 It follows a depression 12 formed near the end of the yoke stack. The slope of the slot 21 is A radial line 8 passing through the center of the stack of each yoke and corresponding to the recess and slot 21. It is parallel to the tabs 23 formed between the ends of the mating yoke stacks.

This feature allows a simple radial movement to move the yoke stack to the pole piece stack. can be inserted into the network.

The mutual fit of the pole piece and yoke segment is limited to the pole part except in the radially outward direction. resists movement of the yoke segment against. resist this movement and The sides of the dovetail section on the pole piece stack and the yoke stack are used to secure the sections together. The end sides of the layer define a small circular hole 26 between each adjacent side. are provided with small, mutually registering depressions 24 and 25. this hole then act as a common detent for adjacent pole pieces and yoke segments. a stator capable of receiving and assembled with moving piles or plugs; resist any movement on the outside.

The stacking of each pole piece is similar to the hole 10 used for the stacking of the yoke stacking. Holes 27 are used to stake together the stack of pole shoe laminates in the same manner. have

In the embodiment shown in FIG. 1, the corners of the polygon are formed by yoke segments. A magnetic pole piece is provided. The radial distance of the corner to the inner circle around the pole piece is thus and therefore its assembly allows maximum handle length on the pole piece. and thereby facilitate the use of round wire with maximum number of turns. However, However, an alternative example is shown in FIG. The description in FIG. 2 is substantially the same as that of the embodiment in FIG. Same as described and not repeated here. The essential difference between the embodiment shown in Figure 2 is A magnetic pole piece is provided in the center of each side of the polygon formed by the yoke segment 6. The point is that

In the embodiment of Figure 2, the length of the handle on the pole piece is shorter, but the handle and each yoke A right angle is defined between the sides 16 or 17 of the segment and thus on the handle. It is easier to wind round wire, and the winding is carried out as shown in Figure 1. It may have a greater number of layers over the length of the handle than in the example.

FIG. 3 shows more clearly the pole pieces according to the second embodiment of the stator shown in FIG. For illustrative purposes, the figures are shown in detail.

A further advantage of this assembly is that there is no interleaving. yoke magnetism The number of contacts in the circuit is minimal.

FIG.1 FIG.2 2. ,. mtimsl 11141 engineering. PCT/GB 89101226 country International investigation report. 38,7°, 2,6

Claims (12)

[Claims] (1) Multiple yokes each consisting of a respective stack of similar laminations A plurality of segments each consisting of a respective stack of similar laminates. an electric stator comprising a magnetic pole piece, the portion and the magnetic pole piece forming a continuous yoke. The segments are mated so that they interfit with and are thereby coupled to their respective pole pieces. A stator having a complementary part. (2) The yoke segment defines the yoke in the shape of a polygon. Theta. 3. The portions of claim 2 are joined by a pole piece at each corner of the polygon. stator. (4) a claim in which the parts are joined by respective pole pieces in the center of each side of the polygon; The stator according to item 2. (5) Each lamina of the stator includes four yoke segments and four pole shoe sections. , the stator according to any one of claims 2 to 4. (6) The yoke segment includes a plurality of legs, each straight and with parallel sides, and each segment Claims 2 to 3, wherein the inner side of the ment is substantially complementary to the outer side thereof. 5. The stator according to any one of 5. (7) Each pole piece includes a pair of slanted slots defining a dovetail portion; any preceding claim in which the yoke segment accepts a complementary end portion of the yoke segment. The stator described in section. (8) The slots have parallel sides and are symmetrical about the center line of each pole piece. The stator according to claim 7. (9) A method of manufacturing an electric stator, each of which has a yoke segment forming a plurality of first stacks having cross-sections, each of which has a cross-section of a pole piece; forming a number of second laminations corresponding to the surface, and forming a plurality of second laminations corresponding to the magnetic poles; A first orifice having complementary portions so as to act as a connector for the stacking of and forming a second stack of layers, and forming a plurality of layers from each stack of layers. constructing and forming a yoke segment and a plurality of pole pieces; Yoke segments in a closed magnetic circuit with pole pieces alternating with A method, including steps for connecting. (10) a tip portion with an arched edge and two generally parallel edges; symmetrically with respect to the center line of the handle and inward from the end part, a terminal portion including two opposing slots defining a dovetail portion at the end portion; Lamination of magnetic pole pieces. (11) A yoke segment that includes a plurality of generally straight leg sections with parallel sides. a laminate, wherein the two longer sides of the laminate are substantially complementary and the yaw A recess is placed at each end to define the end portion parallel to the axis of symmetry of the stack of segments. Laminated, having nearby. (12) The yoke segment of claim 11, wherein the depression is substantially triangular. Laminated.