CN117277652A

CN117277652A - Motor with a motor housing

Info

Publication number: CN117277652A
Application number: CN202311134779.1A
Authority: CN
Inventors: 何宗格; 邓春志; 张艳
Original assignee: Wolong Electric Shanghai Central Research Institute Co ltd; Zhejiang Longchuang Motor Technology Innovation Co ltd; Wolong Electric Group Co Ltd
Current assignee: Wolong Electric Shanghai Central Research Institute Co ltd; Zhejiang Longchuang Motor Technology Innovation Co ltd; Wolong Electric Drive Group Co Ltd
Priority date: 2023-09-04
Filing date: 2023-09-04
Publication date: 2023-12-22

Abstract

The application discloses an electric machine. The motor includes a housing assembly, a spindle, a rotor assembly, and a stator assembly. The shell component is provided with an installation cavity; the main shaft is rotatably arranged in the mounting cavity and extends out of the shell component from the mounting cavity; the rotor component is arranged in the mounting cavity and is fixed on the main shaft; the stator assembly comprises a winding and at least two annular stator cores, wherein the annular stator cores are nested, the winding is arranged on the outermost annular stator core, and the winding extends out of two sides of the outermost annular stator core along the axial direction of the main shaft. The motor can solve the problems of low transmission efficiency and high energy consumption of the existing motor during use.

Description

Motor with a motor housing

Technical Field

The application relates to the technical field of driving devices, in particular to a motor.

Background

Today's industrial power is largely consumed by motors, about 14% of which comes from high power motors (1 MW-50 MW) driving 10000RPM to 20000RPM mechanical structures through large gearboxes, and flow is controlled by mechanical throttle rather than power electronics based VSDs, transmission efficiency is low and energy consumption is high.

Only low-power high-speed permanent magnet synchronous motors are available in the market, and the technology is not mature, so that mass production is not formed. The application aims to develop a high-power high-torque magnetic suspension three-phase permanent magnet synchronous motor so as to solve the problems of low transmission efficiency and high energy consumption of the existing motor.

Disclosure of Invention

The main aim of the application is to provide a motor to solve the problem that current motor's transmission efficiency is low, and the energy consumption is high during the use.

The present application provides an electric machine comprising:

the shell assembly is provided with an installation cavity;

the main shaft is rotatably arranged in the mounting cavity and extends out of the shell assembly from the mounting cavity;

the rotor assembly is arranged in the mounting cavity and is fixed on the main shaft;

the stator assembly comprises a winding and at least two annular stator cores, wherein the annular stator cores are nested, the winding is arranged on the outermost annular stator core, and the winding extends out of two sides of the outermost annular stator core along the axial direction of the main shaft.

Further, the annular stator core comprises two annular stator cores, the two annular stator cores comprise a first stator core and a second stator core sleeved on the periphery of the first stator core, and the winding is arranged on the second stator core.

Further, a plurality of magnetism isolating spaces are arranged in the circumferential direction of the first stator core.

Further, the magnetism isolating space is filled with a supporting magnetism isolating body.

Further, a limiting groove is formed in one of the outer peripheral surface of the first stator core and the inner peripheral surface of the second stator core, a limiting protrusion matched with the limiting groove is formed in the other one of the outer peripheral surface of the first stator core and the inner peripheral surface of the second stator core, and the limiting groove and the limiting protrusion extend along the axial direction of the main shaft.

Further, at least one limiting strip is arranged on two sides of the stator assembly, the limiting strip extends along the radial direction of the main shaft, and the limiting strip is locked on at least one of the first stator core and/or the second stator core through a locking piece.

Further, the housing assembly includes:

the annular shell is internally provided with a water cooling channel which extends along the length direction of the annular shell;

the first end cover is detachably arranged at the first end of the annular shell and is provided with a plurality of first air openings;

the second end cover is detachably arranged at a second end, opposite to the first end, of the annular shell, and a plurality of second air openings are formed in the second end cover.

Further, the first air port and the second air port are symmetrically arranged with respect to the annular housing.

Further, the motor further includes:

the first magnetic suspension bearing and the second magnetic suspension bearing are sleeved on the main shaft at intervals, the first magnetic suspension bearing and the second magnetic suspension bearing are respectively positioned on two sides of the stator assembly, and the first magnetic suspension bearing and the second magnetic suspension bearing are at least partially positioned in the space between the winding and the main shaft.

Further, the motor further includes:

the junction box is arranged on the shell component;

the first impeller and the second impeller are respectively and fixedly connected to the two ends of the main shaft.

In this application, through setting up the stator module of motor into the annular stator core of two at least nested settings to set up the winding on the annular stator core in the outside, so set up, can make the inner structure of motor compacter, can reduce the axial length of the main shaft of motor, and then can improve running power, rotational speed and the moment of torsion of motor to a certain extent. The motor can be directly connected with a driven mechanical structure in actual use, an intermediate transmission mechanism such as a gear box is not required to be used for connecting the motor with the driven mechanical structure, the energy consumption in the use process of the motor can be greatly reduced, and the transmission efficiency is higher.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application. In the drawings:

FIG. 1 is a half cross-sectional view of an electric motor disclosed herein;

FIG. 2 is a left side view of the motor disclosed herein;

FIG. 3 is a right side view of the motor disclosed herein;

FIG. 4 is a half cross-sectional view of a stator assembly of the motor disclosed herein;

FIG. 5 is a left side view of FIG. 4;

fig. 6 is an enlarged view of the region M in fig. 5.

Wherein the above figures include the following reference numerals:

10. a housing assembly; 11. an annular housing; 111. a water cooling channel; 12. a first end cap; 13. a second end cap; 101. a mounting cavity; 102. a first tuyere; 103. a second tuyere; 20. a main shaft; 30. a rotor assembly; 40. a stator assembly; 41. an annular stator core; 411. a first stator core; 4111. a magnetism isolating space; 4112. a limit groove; 412. a second stator core; 4121. a limit protrusion; 42. a winding; 43. a limit bar; 50. a support magnetism insulator; 60. a locking member; 70. a first magnetic suspension bearing; 80. a second magnetic suspension bearing; 90. a junction box; 100. a first impeller; 110. and a second impeller.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the authorization specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1 to 6, according to an embodiment of the present application, there is provided an electric motor. The motor includes a housing assembly 10, a main shaft 20, a rotor assembly 30, and a stator assembly 40.

Wherein, the housing assembly 10 is provided with a mounting cavity 101; the main shaft 20 is rotatably arranged in the mounting cavity 101 and extends out of the mounting cavity 101 from the casing assembly 10; the rotor assembly 30 is disposed within the mounting cavity 101 and secured to the main shaft 20; the stator assembly 40 includes a winding 42 and at least two annular stator cores 41, the at least two annular stator cores 41 are nested, and the winding 42 is disposed on the outermost annular stator core 41 and extends out of two sides of the outermost annular stator core 41 along the axial direction of the spindle 20.

In the present application, since the stator assembly 40 of the motor includes at least two annular stator cores 41 that are nested, and the windings 42 are mounted on the outermost annular stator core 41, after being mounted, the windings 42 extend out of both sides of the outermost annular stator core 41 in the axial direction of the main shaft 20. At this time, with the support of the inner annular stator core 41, a relatively large space is provided between the winding 42 and the spindle 20, so that other structures of the motor can be assembled in the space between the winding 42 and the spindle 20, the structure inside the housing assembly 10 can be drawn toward the center of the mounting cavity 101, and the length of the entire motor in the axial direction of the spindle 20 can be shortened. The shorter the length of the spindle 20, the higher the stability of the spindle 20 when rotating, and is more suitable for high-speed operation and high-power and high-torque operation of the motor.

That is, in this embodiment, the stator assembly 40 of the motor is configured as at least two annular stator cores 41 that are nested, and the windings 42 are disposed on the outermost annular stator core 41, so that the internal structure of the motor can be more compact, the axial length of the main shaft 20 of the motor can be reduced, and the running power, the rotation speed and the torque of the motor can be improved to a certain extent. The motor can be directly connected with a driven mechanical structure in actual use, an intermediate transmission mechanism such as a gear box is not required to be used for connecting the motor with the driven mechanical structure, the energy consumption in the use process of the motor can be greatly reduced, and the transmission efficiency is higher.

Further, the housing assembly 10 in the present embodiment includes an annular housing 11, a first end cap 12, and a second end cap 13. The annular shell 11 is embedded with a water cooling channel 111, and the water cooling channel 111 extends along the length direction of the annular shell 11; the first end cover 12 is detachably arranged at the first end of the annular shell 11, and the first end cover 12 is provided with a plurality of first air inlets 102; the second end cover 13 is detachably disposed at a second end of the annular housing 11 opposite to the first end, and a plurality of second air openings 103 are disposed on the second end cover 13. In this embodiment, the casing assembly 10 is configured as the annular housing 11, the first end cover 12 and the second end cover 13 which are detachable from each other, so that the assembly of the internal structure of the motor is facilitated. In actual installation, the first end cover 12 and the second end cover 13 can be fixed on the annular shell 11 by adopting structures such as bolts, screws and the like, and the structure is simple and the installation is convenient.

In addition, the annular shell 11 is internally provided with a water cooling channel 111, and when the motor works, liquid such as cooling water can be conveyed to the water cooling channel 111, so that the motor is conveniently cooled. The water cooling passage 111 may be a straight passage provided along the longitudinal direction of the annular housing 11, or a spiral passage provided spirally along the longitudinal direction of the annular housing 11, and any deformation manner under the concept of the present application is within the scope of the present application. Correspondingly, the motor can be air-cooled by the action of the first air opening 102 on the first end cap 12 and the second air opening 103 on the second end cap 13.

That is, the motor in this embodiment can utilize water cooling and forced air cooling to combine to cool down, and the cooling effect is good, can improve the operating stability of motor to a certain extent.

Further, the first air port 102 and the second air port 103 in the present embodiment are symmetrically disposed about the annular housing 11, that is, the first air port 102 on the first end cover 12 and the second air port 103 on the second end cover 13 are disposed opposite to each other, which is more suitable for air convection and can improve the cooling effect of the motor in the present embodiment to some extent. Illustratively, the first tuyere 102 and the second tuyere 103 in the present embodiment may be provided as one, two, three, or more than three. Fig. 2 and 3 of the present application show the case when the number of the first tuyere 102 and the second tuyere 103 is four. The first tuyere 102 and the second tuyere 103 are provided around the outer periphery of the main shaft 20 in a circular arc shape, and thus, the structural strength of the first end cap 12 and the second end cap 13 can be ensured while the heat radiation effect is ensured.

Further, the motor in this embodiment further includes a first magnetic bearing 70 and a second magnetic bearing 80, where the first magnetic bearing 70 and the second magnetic bearing 80 are sleeved on the main shaft 20 at intervals, the first magnetic bearing 70 and the second magnetic bearing 80 are located at two sides of the stator assembly 40, respectively, and the first magnetic bearing 70 and the second magnetic bearing 80 are at least partially located in a space between the winding 42 and the main shaft 20. Compared with the prior art, the arrangement of the first magnetic suspension bearing 70 and the second magnetic suspension bearing 80 in the embodiment is closer to the stator assembly 40, and the structure of the motor in the axial direction of the main shaft 20 is more compact, so that the axial length of the main shaft 20 can be effectively shortened, the running stability of the main shaft 20 can be conveniently improved, and the motor is more suitable for improving the power of the motor.

Further, the motor in the present embodiment further includes a junction box 90, a first impeller 100, and a second impeller 110. The junction box 90 is arranged on the shell assembly 10, so that the structure of external circuits, a control circuit board and the like can be conveniently connected; the first impeller 100 and the second impeller 110 are fixedly connected to both ends of the main shaft 20, respectively, so as to be connected to a mechanical structure to be driven.

The rotor assembly 30 comprises a plurality of magnetic steels, and the magnetic steels can be fixed on the rotating shaft 20 after being subjected to hot melting and solidification through the carbon fiber protective sleeve, so that the structure strength is high, and the heat dissipation effect is good.

In some embodiments of the present application, the annular stator cores 41 include two, and for convenience of distinction, the two annular stator cores 41 are respectively identified as a first stator core 411 and a second stator core 412. In actual installation, the second stator core 412 is sleeved on the outer periphery of the first stator core 411, the winding 42 is disposed on the second stator core 412, and the winding 42 extends out of two sides of the second stator core 412 along the axial direction of the spindle 20. At this time, the winding 42 may form a relatively large space with the main shaft 20 under the support of the first stator core 411, and the structure such as a bearing may be installed in the space, and the structure on the main shaft 20 may be closer to the stator assembly 40, so that the length of the main shaft 20 in the axial direction is conveniently shortened, and the motor is more suitable for smooth running.

Further, a plurality of magnetism isolating spaces 4111 are provided in the circumferential direction of the first stator core 411 in the present embodiment. The magnetism isolating space 4111 may be one, two or more. The arrangement of the magnetism isolating space 4111 can play a certain magnetism isolating role, and ensure the running performance of the motor.

In the embodiment, the magnetic isolation space 4111 is filled with the supporting isolation magnet 50, and when the embodiment is actually designed, the supporting isolation magnet 50 is filled and supported in the magnetic isolation space 4111, and the supporting isolation magnet 50 does not extend out of two sides of the first stator core 411, so that the space between the winding 42 and the spindle 20 is not occupied. By the action of the supporting spacer 50, the structural strength of the stator assembly 40 in the present embodiment can be improved, facilitating the installation and supporting of the second stator core 412 provided with the windings 42. At the same time, the provision of the supporting magnetism insulator 50 can further enhance the magnetism insulator effect of the first stator core 411.

Alternatively, the support spacer 50 in this embodiment includes a polyphenylene sulfide (PPS) support, which is a thermoplastic specialty engineering plastic with excellent overall properties, and is distinguished by high temperature resistance, corrosion resistance, and excellent mechanical properties. When the motor heats, the supporting magnetism isolating body 50 can maintain its original shape well, so that the supporting effect and the magnetism isolating effect of the first stator core 411 can be ensured. Of course, in other embodiments of the present application, the supporting spacer body 50 may be made of other plastic materials with high temperature resistance, and any other modifications within the spirit of the present application are within the scope of the present application.

As shown in fig. 3 to 6, for convenience of assembly, a limit groove 4112 is provided on one of the outer circumferential surface of the first stator core 411 and the inner circumferential surface of the second stator core 412, and a limit protrusion 4121 is provided on the other of the two to be adapted to the limit groove 4112. That is, when the limit groove 4112 is provided to the outer circumferential surface of the first stator core 411, the limit protrusion 4121 is provided to the inner circumferential surface of the second stator core 412; when the limit groove 4112 is provided to the inner circumferential surface of the second stator core 412, the limit protrusion 4121 is provided to the outer surface of the second stator core 412. Fig. 6 of the present application shows a case where the limit groove 4112 is provided on the outer circumferential surface of the first stator core 411, and the limit protrusion 4121 is provided on the inner circumferential surface of the second stator core 412. Wherein, the limit groove 4112 and the limit protrusion 4121 each extend along the axial direction of the main shaft 20. Optionally, the limiting groove 4112 is a dovetail groove, and the corresponding limiting protrusion 4121 is a limiting block adapted to the dovetail groove, and during actual installation, the second stator core 412 can be prevented from moving along the radial direction of the first stator core 411 by the limiting cooperation of the limiting groove 4112 and the limiting protrusion 4121, so that the structure is stable and reliable.

In the present embodiment, at least one limiting bar 43 is disposed on both sides of the stator assembly 40, the limiting bar 43 extends along the radial direction of the stator assembly 40, and the limiting bar 43 is locked on at least one of the first stator core 411 and/or the second stator core 412 by the locking member 60. That is, the limiting bar 43 may be locked to the first stator core 411 by the locking member 60, may be locked to the second stator core 412 by the locking member 60, and may be locked to both the first stator core 411 and the second stator core 412 by the locking member 60. By the action of the limit bar 43, not only the first stator core 411 and the second stator core 412 can be fixed together, but also the first stator core 411 and the second stator core 412 can be prevented from being relatively displaced in the axial direction of the main shaft 20. Optionally, a plurality of limiting bars 43 are disposed on both sides of the stator assembly 40 in the present embodiment, and the plurality of limiting bars 43 extend in a radial direction of the main shaft 20 and are disposed radially, so that the first stator core 411 and the second stator core 412 are conveniently and stably connected together.

Illustratively, the locking member 60 in this embodiment may be a locking screw, a locking pin, or a locking buckle, which is not specifically limited in this application.

Alternatively, the windings 42 in the present application employ FCR thin film deposited wire, 10KV high voltage mature insulation, and H-stage insulation systems. The rotor assembly 30 is made of N42SH magnetic steel with high temperature resistance and other magnetic materials, the rotating shaft 20 is a 42CrMo forged shaft, and heat treatment is carried out after machining is completed. The first impeller 100 and the second impeller 110 are made of aviation aluminum 7075.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.

The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An electric machine, comprising:

a housing assembly (10), wherein a mounting cavity (101) is arranged on the housing assembly (10);

a spindle (20), the spindle (20) being rotatably arranged in the installation cavity (101) and extending from the installation cavity (101) to the housing assembly (10);

a rotor assembly (30), the rotor assembly (30) being disposed within the mounting cavity (101) and secured to the spindle (20);

stator module (40), stator module (40) include winding (42) and two at least annular stator core (41), two at least annular stator core (41) nest setting, winding (42) set up in outermost annular stator core (41) are last, just winding (42) are followed the axis direction of main shaft (20) stretches out in the both sides of outermost annular stator core (41).

2. The electric machine according to claim 1, characterized in that the annular stator core (41) includes two, the two annular stator cores (41) include a first stator core (411) and a second stator core (412) sleeved on the outer periphery of the first stator core (411), and the winding (42) is disposed on the second stator core (412).

3. The motor according to claim 2, characterized in that a plurality of magnetism isolating spaces (4111) are provided in the circumferential direction of the first stator core (411).

4. A machine according to claim 3, characterized in that the magnetism isolating space (4111) is filled with supporting magnetism isolating bodies (50).

5. The motor according to claim 2, wherein a limit groove (4112) is provided on one of an outer circumferential surface of the first stator core (411) and an inner circumferential surface of the second stator core (412), and a limit protrusion (4121) adapted to the limit groove (4112) is provided on the other, and both the limit groove (4112) and the limit protrusion (4121) extend in an axial direction of the main shaft (20).

6. The electric machine according to claim 2, characterized in that at least one limit bar (43) is provided on both sides of the stator assembly (40), the limit bar (43) extends in the radial direction of the main shaft (20), and the limit bar (43) is locked on at least one of the first stator core (411) and/or the second stator core (412) by a locking member (60).

7. The electric machine according to any one of claims 1 to 6, characterized in that the housing assembly (10) comprises:

the device comprises an annular shell (11), wherein a water cooling channel (111) is arranged in the annular shell (11), and the water cooling channel (111) extends along the length direction of the annular shell (11);

the first end cover (12) is detachably arranged at the first end of the annular shell (11), and the first end cover (12) is provided with a plurality of first air openings (102);

the second end cover (13), second end cover (13) detachably set up in annular casing (11) with the second end that first end is opposite, be provided with a plurality of second wind gap (103) on second end cover (13).

8. The electric machine according to claim 7, characterized in that the first tuyere (102) and the second tuyere (103) are symmetrically arranged with respect to the annular housing (11).

9. The motor according to any one of claims 1 to 6, characterized in that the motor further comprises:

the magnetic bearing device comprises a main shaft (20), a first magnetic bearing (70) and a second magnetic bearing (80), wherein the first magnetic bearing (70) and the second magnetic bearing (80) are sleeved on the main shaft (20) at intervals, the first magnetic bearing (70) and the second magnetic bearing (80) are respectively positioned at two sides of the stator assembly (40), and the first magnetic bearing (70) and the second magnetic bearing (80) are at least partially positioned in a space between the winding (42) and the main shaft (20).

10. The motor according to any one of claims 1 to 6, characterized in that the motor further comprises:

-a junction box (90), said junction box (90) being provided on said housing assembly (10);

the device comprises a first impeller (100) and a second impeller (110), wherein the first impeller (100) and the second impeller (110) are respectively and fixedly connected to two ends of the main shaft (20).