SU1585873A1 - Method of manufacturing electric machine core - Google Patents

Abstract

The invention relates to the design and manufacture of electrical machines. The aim of the invention is to expand the technological capabilities of manufacturing cores from various materials and various designs. This goal is achieved by making two core parts with a non-uniform magnetic structure, pre-joining them in cages, placing the core coaxially with the technological device for closing the magnetic flux, and measuring the largest and smallest values with relative rotation of the core and technological tool, for example, the moment of resistance to rotation and determine the position of the parts of the core at which the difference in the specified values of the moments is minimal. Determining the optimal position of the core parts reduces the ripple of the torque of the motors and the ripple of the output voltage of the generators. 3 il.

Description

The invention relates to the design and manufacture of electric machines (EM), in particular EM direct current, both collector and valve, and can be used in the development and manufacture of these EM, primarily torque (usually low-speed) electric motors uniform rotation of the shaft.

The aim of the invention is the expansion of technological capabilities by providing the manufacture of cores of various designs and from various materials, including magnetic alloys.

FIG. 1 shows a circuit for testing a core mounted on an EM stator and consisting of two parts (the purpose of the test is to determine the optimal relative position of the EM core parts); FIG. 2 - mounting on the rotor (shaft) of the core, which consists of two parts in FIG. 3 - dependence on the angle “/ rotation of the rotor relative to the stator of two particular moments M (., Total moment MC of resistance to rotation of the rotor, due to the interaction of the technological device for closing the magnetic flux, respectively, with the first, second part of the core and with the whole core.

The test pattern in FIG. 1 contains the first part of the composite core EM 1, the second part of this core 2, the technological device 3 for closing the magnetic flux core

CX)

sd

00

P1

with

ka, mounted coaxially to the core, shaft 4, bearings 5 on this shaft, sleeves 6 and 7, torque meter 8 (only its movable part is shown), bearings 9 to ensure rotation of the sleeves with the core, housing 10 and low-speed drive motor 11. Stationary part of the torque gage 8, the stator of the electric motor 11 and the bearings 9 are installed with a tB in one housing 10. The rotor of this electric motor is rigidly connected to the I clip 6.

The first part of the core 1 is rigidly fixed in the holder 6 with screws (not shown), and the second part of it 2 is rigidly fixed in the holder 7 with screws 12 and can be rotated relative to the first part of the core 1. Screws 13 securely fasten the holder 6 and 7 between by myself. On the outer surface of the clips 6 and 7 there are risks (see FIG. 1), which allow you to set certain angles of rotation of the second part of the core relative to its first part, as the corresponding angles of rotation of the holder 7 are also removable of the holder 6. ski: on vnut10

15

20

25

relatively fixed case with a water motor (not shown). The shaft 4 is connected to the movable part of the torque meter (not shown). The non-movable part of the torque meter is rigidly connected to the indicated first case.

The composite core of FIG. 1 and or 2 can be made in the form of an electromagnetic core or in the form of an EM inductor with poles of permanent magnets. Accordingly, the device for closure of the magnetic flux must be made in the form of an inductor or EM core with a winding or without a winding. A corresponding winding can also be coupled with a composite core. For example, this may be a root winding superimposed on a smooth core magnetic core and not interfering with the mutual rotation of its parts. Parts of the heart. Nicknames - magnetic cores can be monolithic (for example, for low-speed, mayberg electric motors) or laminated (for example, for speed and torque electric motors). They can have slots (straight or skewed) and can not have them. Parts of inductor core can

 , - -iiii- i ai-i, in t4iupcl MOIyT

The outer (seating) surface of the obi-30 should be made monolithic of magnet 6, the end surface of the holder 7 facing the holder 6, the end (right) surface of the first part of the core and the outer cylindrical surface of its second part. These risks are necessary for setting parts of the core to their original position and memorizing this position. Two risks on the outer surface of the casing 6 and the casing 7, as well as the four other specified risks on different parts of the core and on other surfaces must be facing each other. clips 6 and 7.

FIG. 2 shows that parts 1 and 2 of the composite rotating core can be temporarily rigidly connected to each other and fixed on the shaft 4 with the help of two conical washers 14 and 15. Risks are placed on the outer cylindrical surface of the core parts, to reset the core parts, positions and memorization of these positions. A technological device for closing the magnetic flux 3 can be rotated from 35 coaxially to the composite core.

40

45

50

55

solid alloy or precast of the poles of the magnets and the magnetic circuit, which is installed poles. In both cases, the poles can be straight or skewed. A strip of non-conductive material can be installed between the parts of the inductor to reduce the magnetic flux of the scattering.

When implementing this method, in order to determine the optimal mutual position of both parts of the core, joint tests are carried out.

First, these parts are set to their original position in terms of the risks on them and on the clips (see Fig. 1) or only on the risks on them (see Fig. 2). Then, with the help of screws, the parts of the core are fastened in the corresponding cages, the cages are fastened together (see FIG. 10) or the parts of the core are fixed on the shaft with conical washers (see Fig. 2). Then, using a drive motor, they make a relative rotation core and technology adapters on the angle of at least 2. At the same time from 0

five

0

five

relatively fixed case driven motor (not shown). The shaft 4 is connected to the movable part of the torque meter (not shown), the fixed part of the torque meter is rigidly connected to the specified 1st case.

The composite core of FIG. 1 and 2 can be made in the form of an EM core magnet or in the form of an EM inductor with poles of permanent magnets. Accordingly, the device for closure of the magnetic flux must be made in the form of an inductor or EM core with a winding or without a winding. A corresponding winding can also be coupled with a composite core. For example, this may be a root winding superimposed on a smooth core magnetic core and not interfering with the mutual rotation of its parts. Parts of the heart. Nicknames - magnetic cores can be monolithic (for example, for low-speed, mayberg electric motors) or laminated (for example, for speed and torque electric motors). They can have slots (straight or skewed) and can not have them. Parts of inductor core can

 , - -iiii- i ai-i, in t4iupcl MOIyT

0 be made of monolithic magnesium5

0

five

0

five

solid alloy or precast of the poles of the magnets and the magnetic circuit, which is installed poles. In both cases, the poles can be straight or skewed. A strip of non-conductive material can be installed between the parts of the inductor to reduce the magnetic flux of the scattering.

When implementing this method, in order to determine the optimal mutual position of both parts of the core, joint tests are carried out.

First, these parts are set to their original position in terms of the risks on them and on the clips (see Fig. 1) or only on the risks on them (see Fig. 2). Then, with the help of screws, the parts of the core are fastened in the corresponding cages, the cages are fastened together (see FIG. 10) or the parts of the core are fixed on the shaft with conical washers (see Fig. 2). Then, using a drive motor, they make a relative rotation the core and the technology of the fixture on the angle not less than 2. At the same time, using a torque meter, the torque against the rotation of the shaft M is measured.

ABOUT

(in the presence of a root winding and feeding it are compatible with: and voltages) the torque of EM Ngn. But the measurement results determine the largest and smallest values of the measured moment and their difference R. After that, in a similar way, I install the parts of the core to different positions relative to each other, shifting one part relative to another by an angle L | and taking advantage of these risks, rigidly fasten them, carry out a relative rotation of the core and the process equipment, measure the moment M, or Mgp, determine the largest and smallest values of the measured moment of their difference R,. .., R |,. .., R (p 2 - the number of mutual positions of the core parts). According to the results of the tests described, the relative position of the core parts is determined at which the difference in measured torque is minimal. In this position, parts of the core are finally joined into a single EM core.

Corners / i | the mutual shift of the core parts relative to the initial position (for which ft 0) can be, for example, the following.

If the core is made in the form of a composite core of the core with Z grooves (the grooves of both parts are aligned)

 2} T

then the angle A can be equal to - S (K-1 / k.

where S is an integer to ratio

and preference

7g- also was S p

integer If the core is done, 11

but

not in the form of a composite core of the core, then 21G

smooth magician angle A can

be equal to - (k-l). Preferably n

an odd number of n. If the core is made as a composite inductor, and EM measles is made with Z grooves, then among the values of the angle / 3,

value equal to as most in, e

rotatable optimal value, which corresponds to the minimum of the difference R. Here, the initial position (/ i 0). corresponds to the location of the poles of the same name of both parts of the inductor against each other.

) f

t

,

,

585873 6

The performance of an EM engine as two parts of the core, testing the core for different mutual positions (research institutes of these parts, determining and providing the optimum mutual position of the core parts from the test results are necessary to reduce the ripple torque

15

20

25

thirty

35

40

rotation of the shaft M, and consequently, the ripple torque of the electric motor with the specified core.

The ripple of the moment is reduced due to the fact that at the optimal mutual position of the h, - core core, the pulsation of the moment M. due to the mutual operation of the technological device for closing the magnetic flux (i.e., the inductor or magnetic core of the EM) with one of the core parts, and the ripple M.'s moment, due to the interaction of this device with another part of the core, are mutually destroyed or at least significantly weakened. This can be seen from fig.Z. Due to the smaller ripple of the EM torque with the composite core, there is a greater uniformity of shaft rotation for motorized operation.

The effectiveness of reducing the momentum pulsation M, for the motor mode of operation of the EM, can be explained as follows.

If, for example, the EM has a conventional core, the electromagnetic moment is approximately independent of the angle 0, and the moment of resistance is within

M change

MS (0.15 ± 0.05) “Mo,

then the torque M varies within

M M, „- M (0.8-0.9) -M.

 E1A

and its pulsations are respectively 0.9–0.8, p o: 9 o o: 8 — If the EM is made with a two-part core with their optimal mutual displacement (as suggested), then the changes in the moments M j, and much less for example

MS (0.15 ± 0.02). Me,

1585873

M (0.83- - 0.87) .M

Em

 0.87 - 0.83 K- 0.87 0.83

Claims (1)

Similarly, the advantage of the proposed technical solution for the generator mode of EM operation, which consists in a lower ripple of the output (rectified) voltage. The method of manufacturing the core of an electric machine, according to which two parts of a core with a non-uniform magnetic structure are made, set the parts relative to the other in a position where the magnetic asymmetry has a minimum value, and connect them, differing by that. eight that, in order to expand technological capabilities by providing the manufacture of cores of various designs and from various materials, including magnetic alloys, before installing the core parts, they are pre-connected to each other in different positions, each of which is provided with a core coaxial to the technological fixture To close the magnetic flux, the relative rotation of the core and the technological device is performed, the largest and smallest values of the moment are measured. that rotational resistance-. or determine the position of the parts of the core at which the difference between the largest and the smallest values of said iiaparameters is minimal. / 12  Rig. one ff .2 m, ct / i 2% / m,  sg A / s 9g.Z one LMC J / iAf "