CN213959837U

CN213959837U - Embedded square motor of permanent magnet

Info

Publication number: CN213959837U
Application number: CN202120023377.4U
Authority: CN
Inventors: 任成波; 周开放; 李文亮; 徐盼
Original assignee: Ningbo Jingcheng Car Industry Co ltd
Current assignee: Ningbo Jingcheng Car Industry Co ltd
Priority date: 2021-01-06
Filing date: 2021-01-06
Publication date: 2021-08-13
Anticipated expiration: 2031-01-06

Abstract

The utility model discloses an embedded square motor of permanent magnet, include stator (1) and be located stator (1) inside rotor (2), stator (1) is square shell (11) including the radial cross-section outline, the outer wall four corners department of shell (11) passes through by the arc surface, the annular equipartition has four recess (111), four places on the inner wall of shell (11) the position of recess (111) with correspond inside and outside four planes on shell (11) outer wall, install permanent magnet (12) in recess (111). The utility model has the advantages of permanent magnet (12) on the motor are difficult for droing, the magnetic leakage volume is little, help motor output torque and power density to promote.

Description

Embedded square motor of permanent magnet

Technical Field

The utility model relates to a square motor, especially an embedded square motor of permanent magnet.

Background

At present, the shell of the permanent magnet motor is generally circular, that is, the stator core mostly adopts the form of a circular sheet, the motor in the shape is inconvenient to transport and install, and more raw materials for manufacturing the stator core need to be consumed in the manufacturing process, so that the square motor is a great hot direction for the research and manufacturing of the permanent magnet motor at present. Because the rotor accommodating space in the motor stator is generally in a cylindrical space structure, when the permanent magnet is additionally arranged, the arc-shaped sheet-shaped permanent magnet is connected with the stator in a single-side bonding mode, the permanent magnet is easy to fall off under the condition of long-time use in the connection mode, and the permanent magnet is not easy to position when being installed, so that magnetic leakage is easily caused due to uneven installation, and further the torque and the power density of the motor are influenced; because the stator of the square motor has larger thickness at the four corners than the four sides, the square motor with slots at the four corners of the stator and embedded permanent magnets appears on the market for positioning and installation, but the leakage flux of the motor in the form is larger, and the output torque and the power density of the motor are lower than those of a round motor under the same material usage. Therefore, the existing square permanent magnet motor has the problems that the permanent magnet on the motor is easy to fall off, the magnetic leakage quantity is large, and the output torque and the power density of the motor are influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an embedded square motor of permanent magnet. The permanent magnet on the motor is not easy to fall off, the magnetic leakage quantity is small, and the output torque and the power density of the motor are improved.

The technical scheme of the utility model: the utility model provides an embedded square motor of permanent magnet, includes the stator and is located the inside rotor of stator, the stator includes that radial cross-section profile is square shell, the outer wall four corners department of shell passes through by the arc surface, the annular equipartition has four recesses, the four places on the inner wall of shell the position of recess with correspond in four planes on the outer wall of shell, install the permanent magnet in the recess.

Compared with the prior art, the beneficial effects of the utility model are embodied in: the four grooves are annularly and uniformly distributed on the inner wall of the shell of the square motor, so that the square motor is convenient to position and install, the permanent magnets can be embedded into the grooves, three surfaces of the permanent magnets embedded into the grooves are in direct contact with the grooves, and the permanent magnets are not easy to fall off after being bonded; the position of recess corresponds inside and outside four planes on the shell outer wall, compares in the structural style of stator four corners department fluting and embedding permanent magnet, the utility model discloses a flux leakage volume is little after the recess is packed into to the permanent magnet, helps motor output torque and power density's promotion.

In the embedded square motor of the permanent magnet, the surface of the permanent magnet, which is opposite to the rotor, is an arc surface, and a cylindrical rotor accommodating space is formed inside the housing after the permanent magnet is assembled.

Alternatively, the surface of the permanent magnet, which is opposite to the rotor, is a plane, and an octagonal prism-shaped rotor accommodating space is formed inside the shell after the permanent magnet is assembled.

In the embedded square motor of the permanent magnet, the cross section of the permanent magnet is rectangular, and two short sides and one long side of the rectangle are attached to the grooves corresponding to three surfaces on the permanent magnet.

In the permanent magnet embedded type square motor, the depth of the groove is greater than the thickness of the permanent magnet.

In the permanent magnet embedded square motor, two sets of armature windings are accommodated in each rotor slot of the rotor.

Drawings

Fig. 1 is a schematic structural view of a cross section of a square motor in embodiment 1 of the present invention;

fig. 2 is a schematic view of magnetic lines of force of a square motor in embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a cross section of a square motor in embodiment 2 of the present invention;

fig. 4 is a schematic view of magnetic lines of force of the square motor in embodiment 2 of the present invention.

Reference numerals: 1-stator, 2-rotor, 11-housing, 12-permanent magnet, 21-armature winding, 111-groove.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Example 1: the utility model provides an embedded square motor of permanent magnet, the structure is shown in figure 1, includes stator 1 and is located 1 inside rotor 2 of stator, stator 1 includes that radial cross-section outline is square shell 11, the outer wall four corners department of shell 11 passes through by the arc surface, the annular equipartition has four recesses 111 on the inner wall of shell 11, the four places the position of recess 111 with correspond in four planes on the outer wall of shell 11, install permanent magnet 12 in the recess 111.

The direction of the internal magnetic field of the permanent magnet 12 in fig. 1 satisfies the law: the internal magnetic field direction of one pair of diagonal permanent magnets 12 is directed toward the center position of the rotor 2, and the internal magnetic field direction of the other pair of diagonal permanent magnets 12 is directed away from the center position of the rotor 2. Finally, the distribution of magnetic lines of force in the motor shown in fig. 2 is obtained, any two adjacent permanent magnets 12 form a magnetic loop, that is, the magnetic lines of force in fig. 2 form four magnetic loops, the magnetic lines of force are dense, the leakage flux is small, and the improvement of the output torque and the power density of the motor is facilitated.

Preferably, the surface of the permanent magnet 12 opposite to the rotor 2 is an arc surface, and a cylindrical rotor accommodating space is formed inside the housing 11 after the permanent magnet 12 is assembled.

After the permanent magnet 12 is assembled into the groove 111, the three surfaces are tightly attached to the groove 111, and the permanent magnet 12 is connected with the groove 111 in a gluing mode.

Preferably, two sets of armature windings 21 are accommodated in each rotor 2 slot of the rotor 2.

The square motor in the embodiment has even air gap after the cylindrical rotor accommodating space is matched with the rotor 2, the vibration and noise of the motor during operation are small, the temperature rise of the motor is small, and the motor bearing is well protected.

Example 2: the utility model provides an embedded square motor of permanent magnet, the structure is shown in fig. 3, include stator 1 and be located 1 inside rotor 2 of stator, stator 1 includes that radial cross-section outline is square shell 11, the outer wall four corners department of shell 11 passes through by the arc surface, the annular equipartition has four recesses 111 on the inner wall of shell 11, the four places the position of recess 111 with correspond in four planes on the outer wall of shell 11, install permanent magnet 12 in the recess 111.

The direction of the internal magnetic field of the permanent magnet 12 in fig. 3 satisfies the law: the internal magnetic field direction of one pair of diagonal permanent magnets 12 is directed toward the center position of the rotor 2, and the internal magnetic field direction of the other pair of diagonal permanent magnets 12 is directed away from the center position of the rotor 2. Finally, the distribution of magnetic lines of force in the motor shown in fig. 4 is obtained, any two adjacent permanent magnets 12 form a magnetic loop, that is, the magnetic lines of force in fig. 4 form four magnetic loops, the magnetic lines of force are dense, the leakage flux is small, and the improvement of the output torque and the power density of the motor is facilitated.

Preferably, the surface of the permanent magnet 12 opposite to the rotor 2 is a plane, and an octagonal prism-shaped rotor accommodating space is formed inside the housing 11 after the permanent magnet 12 is assembled.

Preferably, the cross section of the permanent magnet 12 is rectangular, two short sides and one long side of the rectangle are attached to the groove 111 corresponding to three surfaces on the permanent magnet 12, and the permanent magnet 12 is connected with the groove 111 by gluing.

The rectangular cross-section of the permanent magnet 12 facilitates not only assembly with the groove 111 but also processing, and saves more raw materials compared to the permanent magnet shape in embodiment 1, and can avoid unnecessary waste of materials.

Preferably, the depth of the groove 111 is greater than the thickness of the permanent magnet 12, and after the permanent magnet 12 is glued to the groove 111, the surface of the permanent magnet 12 opposite to the rotor 2 does not protrude outwards.

After the octagonal prism-shaped rotor accommodating space is matched with the rotor 2, the square motor in the embodiment has uneven air gaps, raw materials are saved compared with the stator in the embodiment 1, the uneven air gaps are beneficial to reducing cogging torque and improving air gap magnetic field waveforms, the output torque of the motor is improved, the loss of an iron core is reduced, and the performance of the motor is improved.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Above is only the preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above-mentioned embodiments, all belong to the technical scheme of the utility model under the thought all belong to the protection scope of the present invention. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an embedded square motor of permanent magnet, includes stator (1) and is located rotor (2) inside stator (1), stator (1) is square shell (11) including radial cross section outline, the outer wall four corners department of shell (11) is passed through by the arc surface, its characterized in that: the inner wall of shell (11) goes up the annular equipartition and has four recesses (111), four the position of recess (111) with correspond in four planes on shell (11) outer wall, install permanent magnet (12) in recess (111).

2. The permanent magnet embedded square motor according to claim 1, wherein: the surface of the permanent magnet (12) opposite to the rotor (2) is an arc surface, and a cylindrical rotor accommodating space is formed inside the shell (11) after the permanent magnet (12) is assembled.

3. The permanent magnet embedded square motor according to claim 1, wherein: the surface of the permanent magnet (12) opposite to the rotor (2) is a plane, and an octagonal prism-shaped rotor accommodating space is formed inside the shell (11) after the permanent magnet (12) is assembled.

4. A permanent magnet embedded square machine according to claim 3, characterized in that: the cross section of the permanent magnet (12) is rectangular, and two short sides and a long side of the rectangle are attached to the grooves (111) corresponding to three surfaces on the permanent magnet (12).

5. The permanent magnet embedded square motor according to claim 3 or 4, wherein: the depth of the groove (111) is greater than the thickness of the permanent magnet (12).

6. The permanent magnet embedded square motor according to claim 1, 2, 3 or 4, wherein: and two groups of armature windings (21) are accommodated in each rotor (2) groove of the rotor (2).