SU1758774A1 - Stator of electric machine - Google Patents

Abstract

Essence: permanent magnets 4, 5 are fixed in the stator housing in the axial direction by means of longitudinal projections 9. The latter are made in one piece with the housing. In the axial direction, the sectors of the permanent magnets abut against the projections of the housing corresponding to the position of the ends of the magnets. 1 z.p f-ly, 2 ill.

Description

Faye. 2

The invention relates to electrical engineering, in particular, to the construction of fastening the segments of magnets in the stators of electric machines with excitation from permanent magnets.

A stator of an electric machine with excitation from permanent magnets is known, in which the body of the electric machine is made of a magnetically soft material and serves as a magnetic conductor. The permanent magnets of the stator have the form of cylindrical segments and are attached to the magnetic conductor (case) by means of a special plate attached by rivets or connected by another permanent connection. The plates are made of special spring steel and have protrusions for fastening the magnet segments in axial, radial and axial directions. The deviation of the dimensions along the chord of the magnet segments is compensated in the axial direction of the magnetic rod due to the elastic deformations of the protrusions of the spring plate for their attachment.

However, in this technical solution, the design of the attachment of the magnet segments does not ensure their secure attachment, since with the limiting ratios of the sizes of the magnets and protrusions in the spring plate, and also depending on the permissible loads, they can be released. In addition, the stator design provides for at least four fasteners (two rivets on each plate), forming permanent connections with the stator magnetic circuit, which greatly complicates the stator design, complicates assembly automation due to the presence of heterogeneous connections causing heterogeneous assembly operations , and leads to a great complexity of the assembly.

Closest to the proposed technical entity is an electric DC machine with excitation from permanent magnets having the form of cylindrical segments. Permanent magnet segments are mounted on a mounting support made of a non-magnetic material in the form of two end rings connected by traverse arms located parallel to the axis of the electric machine. The traverses are placed in the gap between the segments of the permanent magnets and, with their side surfaces, interact with the adjacent ends of the magnets. In the axial direction, the magnet segments rest on the end rings of the yoke, which, in turn, interact.

with bearing shield and electric machine housing.

One of the drawbacks of the known technical solution is the large detail, i.e. In order to fix, for example, two segments of magnets, at least six parts are needed that perform various functions. Multi-part construction design of magnet segments

0 leads to a great complexity of manufacturing an electric machine, to the difficulties associated with determining the relative position and positioning of parts in automating the assembly process, which

5 leads to high economic costs.

The purpose of the invention is to simplify the construction of fastening permanent magnets by reducing the number of parts, as well as

0 the ability to automate, reduce cycle v labor intensity of the assembly process and manufacture of parts.

The goal is achieved by the fact that on the inner surface of the housing in place

5 interfaces of the sectors of the magnets are made in one piece with the body longitudinal protrusions, while the side surfaces of each protrusion are in contact with the ends of the adjacent sectors of the permanent magnets, and

0, the magnets are fastened in the longitudinal direction by means of protrusions discretely formed on the inner surface of the housing.

The use of longitudinal protrusions made on the internal surface of the magnet duct (or the body) in one piece with it differs significantly from the known devices for securing the magnet sectors in the axial direction, since a rigid connection of the protrusions with the body or magnetic core appears.

Fig, 1 shows the stator of an electric machine, a general view; in fig. 2 shows section A-A in FIG. one.

5 The stator of an electric machine with excitation from permanent magnets (Fig. 1) consists of a housing 1. which can be made of a magnetically soft material and performs the function of a magnetic circuit. On

0 case 1 (or on the magnetic core) in the plane of the cross section corresponding to the position of the ends 2 and 3 of the sectors of the permanent magnets 4 and 5, a step b is made, which interacts with the ends

5 2 and 3 sectors of permanent magnets 4 and 5 and limits their movement along the stator axis towards the blind end of housing 1. To fix sectors of permanent magnets 4 and 5, 8 axially on the inner surface 7 of housing 1 (or

magnetic conductor) on the length of the ledge 6 to the free end 8 of the housing 1, protrusions 9 are made (FIG. 2), the cross section of which is directed by a convex part into the housing 1 in the direction of the chord, which tightens the ends 10 and 11 of the sector of permanent magnets 4, or the direction of the chord tightening the ends 12 and 13 of the sector 5 of permanent magnets. The longitudinal projections 9 constantly interact with the ends 10 and 11 of sector 4 and the ends of 12 and 13 sector 5 of the permanent magnets. The final securing of sectors 4 and 5 of the permanent magnets in the axial direction is carried out using protrusions 14 and 15, which are located on the inner surface 7 of the housing 1 (or magnetic circuit) in cross section corresponding to the position of the free ends 16 and 17 of the sectors 4 and 5 of the permanent magnets.

Example. To fix the two sectors 4 and 5 of the permanent magnets in the axial direction, the depth hB of the longitudinal projections 9, defined relative to the inner surface 7. of the housing 1 (Fig. 2), should be no more than half the difference between the inner diameter den. housing 1 and the smallest limiting size (L-e} along the chord L between the ends 10 and 1 or 12 and 13 sectors 4 and 5 of permanent magnets, i.e. hB .0.5 (d9H.-L + 61), mm, where d is the tolerance for changing the size L along the chord between the ends of the magnet sector.To ensure that sectors 4 and 5 of the permanent magnets stop at the ledge 6 along the stator axis, 2 and 3 sectors 4 and 5 of the permanent magnets are chamfered by the radius rounding off when receiving the ledge 6. The projections 14 and 15 fixing the sectors 4 and 5 of the permanent magnets are made in diametrically opposite places at an angle of 90 ° to the axis in Stupa 9.

Manufacturing the stator of an electric machine with excitation from permanent magnets with longitudinal projections made in one piece with the housing (or magnet duct) allows fixing the permanent magnets in the axial direction without the use of additional parts. Performing at least one protrusion on each segment of the permanent magnet on the body (or magnetic core) after their installation into the stator body along longitudinal projections allows the permanent magnet segments to be fixed in the axial direction. Due to the base of the device for receiving the protrusions on the free end of the magnet segments after their installation into the stator, a high accuracy of the position of these protrusions relative to the free end of the magnet segments and the absence of additional fastener parts of the permanent magnets are achieved. The simplicity of fastening the permanent magnet segments in the stator allows a significant reduction in the number of transitions during assembly, which reduces cycle time and labor intensity, as well as automates the assembly process.

Claims (2)

Claim 1. A stator of an electric machine containing permanent magnets in the form of sectors fixed in the housing in the longitudinal direction, characterized in that, in order to simplify the design and reduce the labor intensity of manufacture, on the inner surface of the housing at the junction of the sectors of the magnets for the longitudinal protrusions are made integral with the body, and the side surfaces of each protrusion are in contact with the ends of adjacent sectors of the permanent magnets. 2. Sector according to claim 1, characterized in that the magnets are fastened in the longitudinal direction by means of protrusions discretely made on the inner surface of the housing. Anchoring machine