CN114498968B - A multi-directional combined lamination structure of magnetic conductive punching sheets of motor iron core - Google Patents

Abstract

The invention discloses a multi-directional combined lamination structure of magnetic conductive punching sheets of a motor iron core, which belongs to the technical field of power generation, transformation or power distribution. The stator core punching piece is punched from a single piece of silicon steel sheet, a thin-plate material with high magnetic permeability. When there is a magnetic field line perpendicular to the surface of the punching sheet when the motor is running, the lamination method of the punching sheet is changed according to the track direction of the magnetic field line in the iron core. The stator core consists of a radial lamination area and an axial lamination area. The radial lamination area is formed by stacking radially arranged magnetic conductive punches in the axial direction, and is located where the radial component of the magnetic field line is greater than the axial component; , where the axial component of the magnetic field lines is greater than the radial component. Make the plane of the magnetic permeable punching sheet parallel to the magnetic line of force to the greatest extent, thereby reducing the magnetic force line perpendicular to the surface of the punching sheet, to limit the eddy current inside the punching sheet and reduce the core loss.

Description

A multi-directional combined lamination structure of magnetic conductive punching sheets of motor iron core

technical field

The invention relates to an optimized design of a multi-directional combined stacking method of magnetic-conducting punching sheets of a motor iron core, and specifically discloses a multi-directional stacking method of magnetic-conducting punching sheets of a motor iron core, belonging to the technical field of power generation, transformation or distribution.

Background technique

As a device for electromechanical energy conversion, motor efficiency and temperature rise are important indicators to measure motor performance. Reducing motor loss can effectively improve motor efficiency and suppress heat generation. Moreover, in applications such as motors with inconsistent axial lengths of stators and rotors, axial flux motors, etc., the core eddy current loss accounts for a large proportion of the core loss.

The existing methods to reduce the eddy current loss of the motor mainly include: rationally adjusting the magnetic flux distribution in the motor by changing the slot shape, the winding arrangement, and the material of the silicon steel sheet, and reducing the stress during the lamination stamping process. In the existing radial motor iron cores, radial magnetic conductive punching sheets are generally arranged radially and stacked in the axial direction, and the silicon steel sheets of the axial magnetic flux motor are generally also wound in the above-mentioned manner. When there is a magnetic flux perpendicular to the punching direction, the existing iron core punching lamination method will bring about a large punching eddy current, which is not conducive to reducing the eddy current loss.

To sum up, the prior art fails to sufficiently reduce the eddy current loss, and the present application aims to change the arrangement of the iron core punches, and propose a multi-directional combined stacking method of the magnetic conductive punches of the motor iron core.

SUMMARY OF THE INVENTION

Technical problem: The purpose of the invention of the present invention is to aim at the deficiencies of the above-mentioned background technology, to provide a multi-directional composite lamination structure of the magnetic conductive punching sheet of the motor iron core, using a hybrid stator core punching sheet arrangement, by changing the iron core The arrangement of the punching pieces enables the punching pieces to be arranged along the direction of the magnetic force line to achieve the invention purpose of suppressing the eddy current and reducing the eddy current loss, and to solve the technical problem that the eddy current loss of the existing motor is too large.

Technical scheme: a multi-directional composite lamination structure of the magnetic conductive punching sheet of the motor iron core of the present invention, the motor stator iron core of this structure is composed of a radial lamination area and an axial lamination area, and the radial lamination area is composed of a radial magnetic conductive punch. The radially arranged sheets are stacked in the axial direction, and the axial lamination area is formed by the axially arranged axial magnetic guide punching sheets stacked along the radial direction; the radial lamination area is located inside the axial lamination area to form a combined lamination structure.

The radial lamination area is formed by laminating radial magnetic conductive punching sheets, and is located where the radial component of the magnetic force line is greater than the axial component.

The axial lamination area is formed by lamination of axial magnetic guide punching sheets, and is located where the axial component of the magnetic force line is greater than the radial component.

In the combined lamination structure, the iron core punching piece of the unconnected part of the stator yoke and the stator teeth of the motor is divided into upper and lower parts, which are respectively located at the upper and lower ends of the radial lamination area, and the formed axial lamination area is axially arranged along the diameter The radial lamination area formed by the stator yoke of the motor and the iron core punching pieces connected with the stator teeth is arranged radially and stacked in the axial direction.

The axial lamination regions are located above and below the stator yoke.

The radial lamination area is located in the middle of the stator yoke and at the stator teeth.

In the combined lamination structure, a gap is provided in the middle of the axial lamination area, and the radial lamination area is embedded in the notch of the axial lamination area.

In the combined lamination structure, the radial lamination area is located inside the axial lamination area.

A gap is provided in the middle of the axial lamination area, the upper and lower parts of the upper and lower parts are respectively in contact with the radial lamination area at an inclination angle of 30 degrees to 60 degrees, and the outer side of the radial lamination area is inclined from 30 degrees to 60 degrees. angle, the notch of the axial lamination area coincides with the outer side of the radial lamination area.

There is a gap in the middle of the axial lamination area, the upper and lower parts of which are in contact with the radial lamination area respectively are stepped, and the outer side of the radial lamination area is also stepped. The stepped parts on the outer side of the radial lamination area match.

When there is a magnetic line of force perpendicular to the surface of the punching sheet when the motor is running, change the lamination direction of the punching sheet according to the track direction of the magnetic force line in the iron core, so that the plane of the magnetically conductive punching sheet is parallel to the magnetic force line to the maximum extent, forming a kind of iron core The scheme of punching combined lamination. Compared with the traditional method of laminating the punching sheets in the radial direction, the eddy current in the iron core caused by the changing magnetic field perpendicular to the punching sheet direction is greatly reduced. Therefore, the technical effect of reducing the eddy current loss of the motor can be achieved.

In the multi-directional combined stacking device of the magnetic conductive punching sheet of the motor iron core of the present invention, the designed punching sheet stacking is not limited to the structure proposed in this application. In the case of being parallel to the magnetic field line, any combination can be made, and it is not limited to the combination method proposed in this paper.

Beneficial effect: the present invention adopts the above-mentioned technical scheme, has the following advantages:

(1) The overall structure of the stator iron core of the entire motor is simple, and the multi-directional combination and stacking of magnetically conductive punching sheets can reduce the eddy current loss of the iron core.

(2) Using the multi-directional combined lamination device for the magnetic conductive punching sheet of the motor iron core proposed in the present application to transform the stator iron core has strong feasibility and is suitable for various types of motors.

(3) The multi-directional combination and lamination method of the magnetic conductive punching sheet of the motor iron core is not limited to one, and can be further determined according to the actual situation of the magnetic field, performance requirements and process technology.

Description of drawings

FIG. 1 is a schematic diagram of the direction of the magnetic field lines of the stator core of a motor with different axial lengths of the stator and rotor.

Figure 2 shows the radial arrangement of the magnetic permeable punching sheets of the entire motor stator iron core, which are stacked along the axial direction.

FIG. 3 shows that the iron core punches of the part of the stator yoke that are not connected to the stator teeth are axially arranged and stacked in the radial direction, and the rest of the punching plates are arranged radially and stacked in the axial direction.

Figure 4 shows that the part of the stator yoke that is not connected to the stator teeth is axially arranged and stacked in the radial direction, and the rest of the iron core punches are both radially arranged and stacked in the axial direction and axially arranged and stacked in the radial direction.

FIG. 5 shows the stator yoke iron core punching sheets arranged in the axial direction and stacked in the radial direction.

Figure 6 is a simulation diagram of the loss of the motor iron core under different combinations of the motor iron core punching sheets with different axial lengths of the stator and rotor.

FIG. 7 is a schematic structural diagram of the contact portion of the axial lamination area and the radial lamination area at an inclination angle of 30 degrees to 60 degrees.

FIG. 8 is a schematic view of the structure in which the contact portion between the axial lamination area and the radial lamination area is stepped.

There are: radial lamination area 1, axial lamination area 2.

Detailed ways

The technical solutions of the invention will be described in detail below with reference to examples.

As shown in Figure 1, the stator and rotor of the motor have different axial lengths, and the magnetic field lines in the stator core have both radial and axial components.

In Figure 2, the entire stator iron core of the motor is radially arranged and stacked in the axial direction. In Figure 3, the part of the iron core of the motor that is not connected to the stator teeth is axially arranged and stacked along the radial direction, and the rest of the punches are arranged radially. Stacked along the axial direction, in Fig. 4, according to the distribution of the magnetic field lines in Fig. 1, the radial component is larger than the axial component. Make the plane of the magnetic permeable punches parallel to the lines of magnetic force to the greatest extent possible, the stator teeth and iron cores are arranged radially and stacked in the axial direction, the iron core punches in the part of the stator yoke that are not connected to the stator teeth are arranged axially and stacked in the radial direction, and the rest of the iron cores are stacked in the radial direction. The punching sheets are either radially arranged to be stacked in the axial direction or axially arranged to be stacked in the radial direction. The multi-directional combined stacking method of the magnetic conductive punching sheets proposed in this application is adopted. In Figure 5, the stator yoke of the motor adopts iron core punching sheets as a whole. The axial arrangement is stacked along the radial direction, and the radial arrangement of the stator tooth iron core punching sheet is stacked along the axial direction.

Fig. 4 The multi-directional combined stacking method of magnetic conductive punches proposed in this application. The stator core of the motor consists of a radial lamination area and two axial lamination areas. The radial lamination area is composed of radial magnetic conductive punches radially arranged along the Axially stacked, it is located where the radial component of the magnetic field line is greater than the axial component. The axial lamination area is formed by stacking the axial magnetic guide punches axially along the radial direction, and is located where the axial component of the magnetic force line is greater than the radial component. The stator teeth are composed of radial lamination areas, and the part of the stator yoke that is not connected to the stator teeth is divided into upper and lower parts, which are composed of axial lamination areas, which are located at the upper and lower ends of the radial lamination area. The remainder contains both axial and radial lamination areas. The axial lamination areas are located above and below the stator yoke, and the radial lamination areas are located in the middle of the stator yoke and at the stator teeth. A notch is provided in the middle of the axial lamination area, and the radial lamination area is embedded in the notch of the axial lamination area and is located inside the axial lamination area. Make the magnetic permeable punching sheet along the direction of the magnetic field line to the maximum extent, and the eddy current is limited within the narrow sheet. When the magnetic flux passes through the narrow section of the sheet, the net electromotive force in the circuit is small, the resistance of the circuit is large, and the eddy current is large. weaken.

Figure 6 shows the simulation diagram of the reduction effect of the iron core loss after using the multi-directional combined lamination device of the motor iron core magnetic conductive punching sheet. The simulation models are built for 4 different combinations respectively. The normalized iron core loss is based on the conventional motor iron core loss under the same torque. It can be seen from the figure that the multi-directional combination of the motor iron core magnetic permeable punch is adopted. After the lamination device, the core loss is significantly reduced and the effect is the best.

As shown in Figure 7, there is a gap in the middle of the axial lamination area, the upper and lower parts of which are in contact with the radial lamination area respectively at an inclination angle of 30 degrees to 60 degrees, and the outer side of the radial lamination area is 30 degrees to 60 degrees. Angle of inclination, the notch in the axial lamination area coincides with the outside of the radial lamination area.

In Fig. 8, there is a notch in the middle of the axial lamination area, the upper and lower parts of which are in contact with the radial lamination area respectively are stepped, the outer side of the radial lamination area is also stepped, and the stepped notch in the axial lamination area It matches the stepped part on the outside of the radial lamination area.

Figures 7 and 8 exemplarily illustrate the transformation of an existing motor by using the multi-directional combined lamination device for the magnetic conductive punching sheet of the motor iron core disclosed in the present invention. Those skilled in the art can follow the design principles of the present invention according to the actual application requirements. The improvement of other motors can reduce eddy current loss and improve efficiency due to the use of the multi-directional combined stacking device of the magnetic conductive punching sheet of the motor iron core of the present invention. It can be seen that the multi-directional combined stacking device of the magnetic conductive punching sheet of the motor iron core of the present invention has universality for the transformation of this type of motor with a three-dimensional magnetic field.

The multi-directional combined stacking device for the magnetic conductive punching sheet of the motor iron core disclosed in the present invention is not limited to one specific combination according to the actual situation, and can be further determined according to the actual situation of the magnetic field, performance requirements and process technology.

The above embodiments are only exemplary descriptions of this patent, and do not limit its protection scope. Those skilled in the art can also make partial changes to them, as long as they do not exceed the spirit and essence of this patent, they are all within the protection scope of this patent.

Claims (3)

1. A multi-directional combined lamination structure of magnetic conductive punching sheets of a motor iron core, characterized in that the motor stator iron core of the structure is composed of a radial lamination area (1) and an axial lamination area (2), and the radial lamination area is composed of a radial lamination area (1) and an axial lamination area (2). The sheet area (1) is formed by stacking radially arranged magnetically conductive punching sheets in the axial direction, and the axial lamination area (2) is formed by stacking axially arranged magnetically conductive punching sheets along the radial direction; the radially laminated area (1) It is located inside the axial lamination area (2) to form a combined lamination structure; The radial lamination area is formed by lamination of radial magnetic conductive punching sheets, and is located where the radial component of the magnetic force line is greater than the axial component; The axial lamination area is formed by lamination of axial magnetic guide punching sheets, and is located where the axial component of the magnetic force line is greater than the radial component; In the combined lamination structure, the iron core punching piece of the part of the motor stator yoke that is not connected to the stator teeth is divided into upper and lower parts, which are respectively located at the upper and lower ends of the radial lamination area (1), forming the axial lamination area (2). ) The axial arrangement is stacked in the radial direction; the radial lamination area composed of the iron core punches in the connecting part of the motor stator yoke and the stator teeth (1) The radial arrangement is stacked in the axial direction; the axial lamination regions are located above and below the stator yoke; the radial lamination area is located in the middle of the stator yoke and at the stator teeth; In the combined lamination structure, a notch is provided in the middle of the axial lamination area (2), and the radial lamination area (1) is embedded in the notch of the axial lamination area (2). 2 . The multi-directional combined lamination structure of the magnetic conductive punching sheet of the motor iron core according to claim 1 , wherein a gap is provided in the middle of the axial lamination area ( 2 ), and the upper and lower parts thereof are respectively The part in contact with the radial lamination area (1) is at an inclination angle of 30-60 degrees, the outside of the radial lamination area (1) is at an inclination angle of 30-60 degrees, and the gap in the axial lamination area (2) is the same as the The outer sides of the radial lamination area (1) are matched. 3 . The multi-directional combined lamination structure of the magnetic conductive punching sheets of the motor iron core according to claim 1 , wherein a gap is provided in the middle of the axial lamination area ( 2 ), and the upper and lower parts thereof are respectively The part in contact with the radial lamination area (1) is stepped, and the outer side of the radial lamination area (1) is also stepped. The stepped parts match.

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