CN110649723A

CN110649723A - Closed slot structure of motor iron core

Info

Publication number: CN110649723A
Application number: CN201910910053.XA
Authority: CN
Inventors: 金志芳; 陈明镜
Original assignee: Shanghai Electric Group Shanghai Electric Machinery Co Ltd
Current assignee: Shanghai Electric Group Shanghai Electric Machinery Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2020-01-03

Abstract

The invention discloses a closed slot structure of a motor iron core, which does not adopt a connection mode of a slot wedge fixed winding, adopts a structure that a closed slot is arranged on the circumference of the inner circumferential surface of the iron core, which is concentric with the iron core, to replace an open slot, thereby canceling the use of the slot wedge, and under the condition of not changing the size of the motor, the slot shape can be correspondingly compressed without the slot wedge, so that the use sectional area of a conductive and magnetic conductive material is directly improved, or the use of an effective material of the motor can be correspondingly reduced, and the volume of the motor is reduced; the design that the excircle face of the large-fillet copper conductor and the fillet of the closed slot have no edges and corners enables the two to realize smooth transition during the wire embedding process, does not damage outside insulating materials during insulation covering and wire embedding threading, and improves the electrical reliability of the motor.

Description

Closed slot structure of motor iron core

Technical Field

The invention relates to a closed slot structure of a motor iron core, which is used in the field of motors.

Background

Rectangular bare copper conductors for generating electromagnetic force or magnetic field are generally embedded in iron core slots of modern large and medium-sized motors, and the bare copper conductors are coated with corresponding insulating materials according to different insulation grades and withstand voltages of the motors. Referring to fig. 1, in a conventional winding core made of bare copper conductor-clad insulating material, an open slot 1 having a dovetail gap is formed in an inner circumferential surface thereof, and a slot wedge 11 is used to fix the winding after the winding is inserted into the slot. For the motor, the slot wedge is non-conductive and non-magnetic, has only the function of improving the mechanical strength, but occupies the effective space of the motor, correspondingly reduces the slot fullness rate, correspondingly reduces the sectional area of the circulating magnetic field and the current, and is not beneficial to the improvement of the motor performance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a motor iron core closed slot structure which can improve the electrification capacity and the magnetic field intensity of a motor iron core.

One technical scheme for achieving the above purpose is as follows: a closed slot structure of a motor iron core comprises an iron core and a coil inserting wire arranged in the iron core;

the end face of the iron core is provided with a closed slot for arranging an inserted line, the closed slot is arranged on a circumference which is close to the inner circumferential surface of the iron core and concentric with the iron core, and the inner wall of the closed slot is of a round-corner and non-edge-corner structure;

the inserted line is a large-fillet non-angular copper conductor, and is threaded through the port of the closed slot, which is positioned on the end face of the iron core, and penetrates through the iron core.

Furthermore, the outer side of the inserted line is coated by adopting an insulating foil, the width of the insulating foil is slightly larger than the outer circumference of the inserted line, the insulating foil and the inserted line are oppositely arranged in parallel, and then parallel winding is carried out.

The invention relates to a closed slot structure of a motor iron core, which does not adopt a connection mode of a slot wedge fixed winding, adopts a structure that a closed slot is arranged on the circumference of the inner circumferential surface of the iron core, which is concentric with the iron core, to replace an open slot, thereby eliminating the use of the slot wedge, and under the condition of not changing the size of the motor, the slot shape can be correspondingly compressed without the slot wedge, so that the use sectional area of conductive and magnetic conductive materials is directly improved, or the use of effective materials of the motor can be correspondingly reduced, and the volume of the motor is reduced; the design that the excircle face of the large-fillet copper conductor and the fillet of the closed slot have no edges and corners enables the two to realize smooth transition during the wire embedding process, does not damage outside insulating materials during insulation covering and wire embedding threading, and improves the electrical reliability of the motor.

Drawings

FIG. 1 is a schematic structural diagram of a motor core and an open slot in the prior art;

FIG. 2 is a schematic diagram of a prior art rule coated insulating material;

fig. 3 is a schematic structural diagram of a motor core and a closed slot of a motor core closed slot structure according to the present invention;

fig. 4 is a schematic structural view of a wire-inserting coating insulating material of a closed slot structure of an electric machine core according to the present invention.

Detailed Description

In order to better understand the technical solution of the present invention, the following detailed description is made by specific examples:

referring to fig. 1, in order to provide a winding structure of a motor commonly used in the prior art, an open slot 1 having a dovetail notch is formed in an inner circumferential surface of an iron core, a winding conductor 12 (winding conductor) is inserted into the open slot 1, and then the winding conductor is closed by a slot wedge 11 to fix the winding conductor 12. Referring to fig. 2, in this structure, the outside of the coil 12 is wrapped with the insulating foil in a half-lap wrapping manner, in which the coil 12 is wrapped with the insulating foil having the width a in a diagonal direction, and any one turn of the insulating foil covers the position of the bottom insulating foil 1/2 a. Due to the use of the insulation slot wedges 11, the structural form reduces the slot filling rate of the motor, and influences the efficiency of the motor.

Referring to fig. 3, in the closed slot structure of the motor core of the present invention, the end surface of the core is provided with closed slots 2 for installing the coil, the closed slots 2 are arranged on a circumference which is close to the inner circumferential surface of the core and concentric with the core, and the inner wall of the closed slots 2 is a rounded corner-free structure. The insert wire 21 is a large fillet non-angular copper conductor. In order to facilitate the wire inserting operation of the closed slot 2, the wire inserting operation process is that wire inserting is carried out from the opening side of the open slot, the iron core is threaded from the end part, the wire is threaded from the end part of the closed slot 2, which is positioned on the end surface of the iron core, and the wire penetrates through the iron core and is led out from the other end surface of the iron core. The big fillet does not have edges and corners copper conductor and inner wall are the closed slot 2 of fillet no edges and corners structure, do not harm the insulation when being favorable to insulating cladding and rule threading, improve the electric reliability of motor, can guarantee the dielectric strength, the mechanical strength of winding under the condition of not using the slot wedge. Referring to fig. 4, the insulation of the copper conductor is also changed from half-lap wrapping to wrapping, so as to facilitate the smooth "threading" operation. The outside of rule 21 adopts insulating foil 3 to carry out the cladding, and the width of insulating foil 3 is slightly greater than the outer periphery of rule 21, and insulating foil 3 and rule 21 parallel relative setting then carry out parallel wraparound, carry out the gluing after overlapping end to end and fix.

The slot wedge is not used, and the slot wedge is made of non-magnetic conductive and non-conductive insulating materials and only plays a role in mechanical reinforcement and insulation, so that the size of a slot can be correspondingly compressed without using the slot wedge under the condition of not changing the size of the motor, the use sectional area of the conductive and magnetic conductive materials is directly increased, or the use of effective materials of the motor can be correspondingly reduced, the size of the motor is reduced, and the efficiency of the motor is improved. The outer circular surface of the large-fillet copper conductor is in smooth transition, the lap-wrapping process of the embedded wire coated with the insulating material is favorably changed into the wrapping process, the lap-wrapping workload is generally 3-5 times of the wrapping workload, the workload of the iron core extra-long motor is larger, and the working efficiency is greatly improved. The change of the overlapping package into the rolling package is also beneficial to the fact that impregnating varnish enters from gaps between two side layers of the insulation of the rolling package and is fully cured when the vacuum pressure integral impregnating varnish is used after the wire embedding is finished, and the insulation strength is improved. The 'off-line' of the coil inserting process is changed into 'threading', so that the labor intensity of coil inserting operation work can be reduced.

Through the actual detection of the winding placed on the main pole shoe of the direct current motor, the main magnetic field waveform of the motor is greatly improved after the direct current motor is adopted, and the height of the motor pole shoe in the same specification can be compressed, so that the diameter of the outer frame of the motor is reduced under the condition of ensuring that the diameter of the motor rotor is not changed, and the cost performance of the motor is directly improved. The invention adopts a large round-angle copper conductor without edges and corners, and the winding conductor and the groove with the same shape only need to keep certain insulation and 'threading' operation space. According to the comparison of different groove shapes of conductors with the same cross section, the full rate of the motor groove can be improved from about 75% to about 95%. The groove shape adopts a closed groove, and the closed groove can solve the problem of the generation of the cogging effect of an air gap magnetic field caused by an open groove and reduce the distortion of the magnetic field, thereby improving the waveform of the magnetic field and improving the running performance of a motor.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.

Claims

1. The utility model provides a motor core closed slot structure, includes the iron core and sets up the rule in the iron core, its characterized in that:

2. An electric machine core closed slot structure as claimed in claim 1, characterized in that the outside of the winding inserts is covered with an insulating foil having a width slightly larger than the outer circumference of the winding inserts, the insulating foil being arranged parallel to and opposite the winding inserts and then wound in parallel.