CN220915024U - Rotor structure, electro-magnetic synchronous motor and vehicle - Google Patents

Abstract

The application relates to a rotor structure, an electrically excited synchronous motor and a vehicle. Including the rotor body, its characterized in that, the rotor body is provided with a plurality of rotor teeth along the circumferencial direction, be provided with the winding on the rotor tooth, adjacent be provided with first heat radiation structure between the winding on the rotor tooth. The temperature of the windings on the rotor of the electro-magnetic synchronous motor is reduced by arranging the first heat dissipation structure between the rotor windings, so that the motor operates normally.

Description

Rotor structure, electro-magnetic synchronous motor and vehicle

Technical Field

The application relates to the field of motors, in particular to a rotor structure, an electrically excited synchronous motor and a vehicle.

Background

In the prior art, windings are typically provided on the rotor of an electrically excited synchronous motor to provide an electromagnetic field to the rotor. However, the resistance of the winding is generally large, and when the motor runs with load, copper loss generated by the rotor winding is large, and the winding heats quite seriously.

If the temperature of the rotor winding is too high, the motor cannot work normally. It is therefore necessary to reduce the temperature of the motor rotor.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a cooling structure for reducing the temperature of a motor rotor winding.

In a first aspect, an embodiment of the present application provides a rotor structure, including a rotor body, where the rotor body is provided with a plurality of rotor teeth along a circumferential direction, the rotor teeth are provided with windings, and a first heat dissipation structure is provided between the windings on adjacent rotor teeth. Through setting up first heat radiation structure between the rotor winding, heat that produces on the winding can be taken away to first heat radiation structure and further reduce motor rotor's temperature for the motor can normally be operated.

In one embodiment, a first cooling channel extending in the axial direction of the rotor body is provided in each of the first heat dissipation structures.

In one embodiment, the rotor structure further comprises a second heat dissipation structure and a third heat dissipation structure, wherein the second heat dissipation structure is arranged at one axial end of the rotor body, and the third heat dissipation structure is arranged at the other axial end of the rotor body; the second cooling channel is arranged in the second heat dissipation structure, the third cooling channel is arranged in the third heat dissipation structure, and the second cooling channel, the first cooling channel and the third cooling channel are sequentially communicated.

In one embodiment, the rotor structure further comprises a rotating shaft, a liquid supply structure and a liquid outlet structure, wherein the rotating shaft sequentially penetrates through the liquid outlet structure, the rotor body and the liquid supply structure; a liquid inlet channel and a liquid storage channel are arranged in the rotating shaft, the liquid inlet channel is provided with an inlet arranged at one end of the rotating shaft, and the liquid outlet channel is provided with an outlet arranged at the other end of the rotating shaft; the second cooling channel is arranged in the liquid supply structure, the third cooling channel is arranged in the liquid outlet structure, the liquid inlet channel is communicated with the second cooling channel, and the liquid outlet channel is communicated with the third cooling channel.

In one embodiment, the liquid inlet channel comprises a first part extending along the axial direction of the rotating shaft and a second part extending along the radial direction of the rotating shaft, the first part and the second part are communicated with each other, the inlet is formed in the first part, and the second cooling channel is communicated with the second part; and/or the liquid outlet channel comprises a third part extending along the axial direction of the rotating shaft and a fourth part extending along the radial direction of the rotating shaft, the third part and the fourth part are mutually communicated, the outlet is formed in the third part, and the third cooling channel is communicated with the fourth part.

In one embodiment, the second heat dissipating structure includes a first end cap provided at an axial end of the rotor body, and the second cooling passage is formed in a region between the first end cap and the axial end of the rotor body; the third heat radiation structure comprises a second end cover, the second end cover is covered on the other axial end of the rotor body, and a third cooling channel is formed in a region between the second end cover and the other axial end of the rotor body.

In one embodiment, the second heat dissipating structure further includes a first insulating filler filled in a region between the first end cover and the axial end of the rotor body, and the second cooling channel is disposed in the first insulating filler; the third heat radiation structure further comprises a second insulating filling body, the second insulating filling body is filled in the area between the second end cover and the other axial end of the rotor body, and the third cooling channel is arranged in the second insulating filling body.

In one embodiment, the first heat dissipating structure is a third insulating filler that fills between windings on adjacent rotor teeth.

In one embodiment, the number of the first cooling channels is plural, and the plural first cooling channels are sequentially arranged along the radial direction of the first heat dissipation structure.

In one embodiment, the cross-sectional areas of the plurality of first cooling channels sequentially increase in a radial direction of the first heat dissipation structure.

In a second aspect, an embodiment of the present application provides an electrically excited synchronous motor, including a stator and a rotor, where the stator is disposed on an outer periphery of the rotor, and the rotor is the rotor with the cooling structure. Through setting up first heat radiation structure between the rotor winding, heat that produces on the winding can be taken away to first heat radiation structure and further reduce motor rotor's temperature for the motor can normally be operated.

In a third aspect, an embodiment of the present application provides a vehicle, where the vehicle includes the electrically excited synchronous motor, and normal running of the vehicle is ensured due to normal running of the motor.

Drawings

Fig. 1 is a schematic view of a cross-section in the radial direction of a rotor according to the present application.

Fig. 2 is a cross-sectional view of a cooling structure of the rotor of the present application.

Fig. 3 is a schematic perspective view of a rotor according to the present application.

Fig. 4 is a schematic view of a rotor cooling structure according to an embodiment of the present application.

Fig. 5 is a schematic view of a rotor cooling structure according to an embodiment of the present application.

Fig. 6 is a schematic view of a rotor cooling structure according to an embodiment of the present application.

Detailed Description

In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 1-2, a rotor structure 100 is provided in one embodiment of the present application. The rotor structure 100 includes a rotor body 7, the rotor body 7 is provided with a plurality of rotor teeth 1 along a circumferential direction, the plurality of rotor teeth 1 are protruded from the rotor body 7, and winding slots are formed between the plurality of rotor teeth 1. The rotor teeth 1 are provided with insulating paper 3, the insulating paper 3 of the rotor teeth 1 is wound with a winding 2, an electromagnetic field can be generated on the rotor 100 after the winding 2 is electrified, and the electromagnetic field of the rotor 100 can interact with the magnetic field generated by the stator to enable the motor to normally operate. However, the resistance of the winding 2 is generally larger, and when the motor runs under load, especially under high load working conditions, such as when an electric automobile climbs a long and steep slope, larger rotor exciting current is required, and at the moment, copper loss generated by the rotor winding 2 is larger, and the winding generates heat quite seriously, so that the following problems are caused:

The rotor winding 2 is an enamelled copper wire, the higher the temperature is, the larger the resistance is, the higher the loss is, the faster the temperature rises, and the sustainable time of the motor in a high-load working condition is shortened.

The temperature of the rotor winding 2 affects the service life of the insulating paper 3, and if the winding 2 is too hot, the rotor insulating paper will burn out, resulting in damage to the motor.

In an electric excitation synchronous motor, when an electric excitation rotor is powered by a coupling inductance brushless excitation unit, the temperature of a rotor winding 2 is too high, so that the resistance value of an enamelled copper wire of the rotor winding 2 is unstable, and the excitation unit is difficult to control the output current stably.

Thus, by providing a first heat dissipating structure between windings 2 on adjacent rotor teeth 1. The first heat dissipation structure can take away the heat generated by the winding 2, and can be a cooling pipeline arranged in the groove, or can be a third insulating filling body 4 filled between winding grooves, wherein the third insulating filling body 4 has a heat dissipation effect, and further can have an insulating effect, such as epoxy resin. Similarly, the first heat dissipation structure may be a combined structure formed by the third insulating filler 4 and the cooling channel provided in the third insulating filler 4.

Specifically, the first heat radiation structure is a third insulating filler 4 in which a first cooling passage 5 extending in the axial direction of the rotor body is provided. The cooling liquid flowing in the first cooling channel 5 can take away the heat generated by the winding 2, so that the overhigh temperature of the winding 2 is avoided, the loss of the rotor winding 2 is reduced, and the normal operation of the motor rotor 100 is ensured so as to improve the sustainable time of the motor in the high-load working condition. At the same time, the problem of damage to the insulating paper 3 due to too high a temperature of the winding 2 can be avoided. In addition, the temperature of the rotor winding 2 is reduced, so that the stability of the resistance value of the enamelled copper wire of the rotor winding 2 is ensured, and the excitation unit can stably control the output current.

In the present embodiment, the first cooling passage 5 may be a cooling pipe, or may be implemented by other forms. A channel is formed, for example, in the third insulating filling body 4 by means of a mold or the like, i.e. it rests on the third insulating filling body 4, unlike a cooling tube.

In one embodiment, the rotor structure further includes a second heat dissipation structure and a third heat dissipation structure, the second heat dissipation structure is disposed at one axial end of the rotor body 7, and the third heat dissipation structure is disposed at the other axial end of the rotor body 7. Specifically, the second and third heat dissipation structures may be provided in the space between the two axial ends of the rotor core and the end caps 91, 92 at the both ends of the motor. The second heat dissipation structure further comprises a first insulating filler filled in the region between the first end cover and one axial end of the rotor body, and the second cooling channel 11 is arranged in the first insulating filler; the third heat dissipation structure further includes a second insulating filler filled in a region between the second end cover and the other axial end of the rotor body, and the third cooling passage 12 is provided in the second insulating filler. The second cooling channel 11 and the third cooling channel 12 may be formed by referring to the formation of the first cooling channel 5 in the first heat dissipation structure.

Specifically, a second cooling channel 11 is arranged in the second heat dissipation structure, a third cooling channel 12 is arranged in the third heat dissipation structure, and the second cooling channel 11, the first cooling channel 5 and the third cooling channel 12 are sequentially communicated. The cooling liquid may circulate in order along the second cooling channel 11, the first cooling channel 5 and the third cooling channel 12 for cooling the rotor structure.

In one embodiment, the rotor 100 structure further includes a shaft 6. As shown in fig. 2, the rotor body 7 is generally sleeved on the rotating shaft 6 in an interference fit manner, the first end cover 91 of the rotating shaft 6 and the first insulating filler form a liquid supply structure, and the second end cover 92 of the rotating shaft 6 and the second insulating filler form a liquid outlet structure. The rotating shaft 6 sequentially penetrates through the liquid outlet structure, the rotor body and the liquid supply structure.

A liquid inlet channel 13 and a liquid outlet channel 14 are arranged in the rotating shaft 6, the liquid inlet channel 13 is provided with an inlet arranged at one end of the rotating shaft 6, and the liquid outlet channel 14 is provided with an outlet arranged at the other end of the rotating shaft 6; the liquid inlet channel 13 communicates with the second cooling channel 11, and the liquid outlet channel 14 communicates with the third cooling channel 12.

The liquid inlet channel 13 comprises a first part extending along the axial direction of the rotating shaft and a second part 15 extending along the radial direction of the rotating shaft, the first part and the second part 15 are communicated with each other, an inlet is formed in the first part, and the second cooling channel is communicated with the second part 15; likewise, the liquid outlet passage 14 includes a third portion extending in the axial direction of the rotary shaft 6 and a fourth portion 16 extending in the radial direction of the rotary shaft, the third portion and the fourth portion 16 being in communication with each other, an outlet being formed in the third portion, and the third cooling passage 12 being in communication with the fourth portion 16.

As shown in fig. 2, the cooling liquid enters the rotating shaft 6 through an inlet of a first portion extending in the axial direction on the rotating shaft 6, and flows in the direction of L1 to a second portion 15 extending in the radial direction, and enters the second cooling passage 11 in the second heat radiation structure in the direction of L2. Thereafter, the first cooling passage 5 flowing into the first heat dissipation structure flows in the direction of L3, flows through the third cooling passage 12 of the third heat dissipation structure in the direction of L4 to the fourth portion 16 extending in the radial direction on the rotating shaft, and finally flows out to the rotating shaft 6 through the third portion extending in the axial direction, whereby cooling of the rotor structure 100 is achieved.

In the present embodiment, the second portion 15 extending in the radial direction and the fourth portion 16 extending in the radial direction may be provided specifically as oil holes, the number of which may be plural, and which are uniformly arranged along the circumferential direction of the rotating shaft.

In the present embodiment, by disposing the second cooling passage 11 and the third cooling passage 12 between the rotor end face and the end covers 91, 92, it is possible to achieve corresponding communication of the first cooling passage 5 in the axial direction of the winding 2 with the second portion 15 and the fourth portion 16 in the radial extension of the rotating shaft, respectively, and space in the motor rotor 100 is reasonably utilized without disposing the radial cooling passages on the end covers 91, 92.

In one embodiment, a plurality of potting openings 8 for filling the insulating filler are provided in the first end cap 91 and the second end cap 92. As shown in fig. 3, the plurality of filling openings 8 are uniformly arranged along the circumferential direction of the first and second end caps 91, 92, in particular, the number of filling openings 8 is equal to the number of winding slots of the rotor 100, the filling openings 8 are aligned with the center of the winding slots of the rotor, and the insulating filler (such as epoxy resin) is filled into the space formed by the first and second end caps 91, 92 and the rotor body 7 through the filling openings 8 during filling. In this embodiment, potting of the insulating material 4 into the rotor interior is facilitated by the potting openings 8 on the first and second end caps 91, 92.

In this embodiment, the first insulating filler has the characteristics of non-magnetic conduction, large hardness after encapsulation and cooling, good insulation and heat conduction performance, and the like, is filled in the rotor winding groove and the residual space between the two end covers, and can realize insulation between the rotor windings 2 by utilizing the insulation property; and the first insulating filling body integrates the rotor winding 2, the rotor body 7 and the cooling channels, so that the possible relative displacement of the rotor winding 2, the rotor body 7 and the cooling channels during high-speed operation is avoided, and meanwhile, the cooling oil in the cooling channels 5, 11 and 12 takes away heat generated by the winding 2 more efficiently, and the heat dissipation efficiency of the rotor 100 is improved. In addition, the cylindrical filling tool is combined, the excircle of the salient pole rotor is filled into a complete cylindrical surface, and the wind abrasion loss caused by the uneven outer side of the rotor during high-speed operation is reduced.

In one embodiment, as shown in fig. 4 and 5, the first cooling passage 5 includes a plurality of first sub-cooling passages 51, 52, 53, 54, and the plurality of first sub-cooling passages 51, 52, 53, 54 are arranged in the radial direction of the rotor body 7. In this embodiment, by providing a plurality of radially arranged first sub-cooling passages, the heat dissipation capacity of the winding 2 can be increased, and the temperature of the motor rotor can be reduced more rapidly.

In this embodiment, as shown in fig. 4, in a cross section in a radial direction of the rotor body 7, the cross sections of the plurality of first sub-cooling passages 51, 52, 53, 54 are circular, and the cross section radii of the plurality of first sub-cooling passages 51, 52, 53, 54 gradually decrease in a direction from an outer edge of the rotor body 7 to a center of the rotor body 7. Because the space in the winding slot is smaller and smaller along this direction, the decreasing radius of the plurality of first sub-cooling channels 51, 52, 53, 54 can take away heat closer to the inside, thereby improving the heat dissipation efficiency of the winding.

In this embodiment, as shown in fig. 5, the plurality of first sub-cooling channels 51, 52, 53, 54 are cylindrical cooling channels, and the cylindrical channels may be replaced by one long kidney-shaped cooling channel 5, and only one long kidney-shaped cooling channel 5 needs to be arranged in each rotor winding slot, so that the number of the long kidney-shaped cooling channels can be reduced, the contact area between the long kidney-shaped cooling channels and the windings can be increased, and the heat dissipation efficiency can be improved.

In this embodiment, as shown in fig. 6, the first cooling channel 5 may be replaced by a plurality of long kidney-shaped cooling channels 51, 52, so as to reduce the number of cooling channels, increase the contact area of the long kidney-shaped cooling channels, and improve the heat dissipation efficiency.

In one embodiment, the electrically excited synchronous machine includes a stator and a rotor, the outer periphery of the rotor being provided with the stator, the rotor being the rotor 100 structure in the above embodiment. The temperature of the rotor winding 2 is reduced, so that the temperature of the rotor is reduced, and the reduction of the temperature of the rotor can enable the electro-magnetic synchronous motor to normally operate.

In one embodiment, a vehicle includes an electro-active synchronous machine of the present application that is capable of functioning as a drive motor for a new energy vehicle. The normal running of the vehicle is ensured due to the normal running of the motor.

It should be appreciated that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

It is to be understood that the application is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims. Those skilled in the art will recognize that the full or partial flow of the embodiments described above can be practiced and equivalent variations of the embodiments of the present application are within the scope of the appended claims.

Claims (12)

1. The utility model provides a rotor structure, includes the rotor body, its characterized in that, the rotor body is provided with a plurality of rotor teeth along the circumferencial direction, be provided with the winding on the rotor tooth, adjacent be provided with first heat radiation structure between the winding on the rotor tooth.

2. The rotor structure according to claim 1, wherein a first cooling passage extending in an axial direction of the rotor body is provided in the first heat radiation structure.

3. The rotor structure of claim 2, further comprising a second heat dissipating structure disposed at one axial end of the rotor body and a third heat dissipating structure disposed at the other axial end of the rotor body;

The second cooling channel is arranged in the second heat dissipation structure, the third cooling channel is arranged in the third heat dissipation structure, and the second cooling channel, the first cooling channel and the third cooling channel are sequentially communicated.

4. The rotor structure according to claim 3, further comprising a rotating shaft, a liquid supply structure and a liquid outlet structure, wherein the rotating shaft penetrates through the liquid outlet structure, the rotor body and the liquid supply structure in sequence;

A liquid inlet channel and a liquid outlet channel are arranged in the rotating shaft, the liquid inlet channel is provided with an inlet which is arranged at one end of the rotating shaft, and the liquid outlet channel is provided with an outlet which is arranged at the other end of the rotating shaft;

the second cooling channel is arranged in the liquid supply structure, the third cooling channel is arranged in the liquid outlet structure, the liquid inlet channel is communicated with the second cooling channel, and the liquid outlet channel is communicated with the third cooling channel.

5. The rotor structure according to claim 4, wherein the liquid intake passage includes a first portion extending in an axial direction of the rotating shaft and a second portion extending in a radial direction of the rotating shaft, the first portion and the second portion being in communication with each other, the inlet being formed in the first portion, the second cooling passage being in communication with the second portion; and/or the number of the groups of groups,

The liquid outlet channel comprises a third part extending along the axial direction of the rotating shaft and a fourth part extending along the radial direction of the rotating shaft, the third part and the fourth part are communicated with each other, the outlet is formed in the third part, and the third cooling channel is communicated with the fourth part.

6. A rotor structure according to claim 3, wherein the second heat dissipation structure includes a first end cover provided at an axial end of the rotor body, the second cooling passage being formed in a region between the first end cover and the axial end of the rotor body;

The third heat dissipation structure comprises a second end cover, the second end cover is covered on the other axial end of the rotor body, and the third cooling channel is formed in an area between the second end cover and the other axial end of the rotor body.

7. The rotor structure of claim 6, wherein the second heat dissipating structure further comprises a first insulating filler filled in a region between the first end cover and an axial end of the rotor body, the second cooling channel being provided within the first insulating filler;

The third heat dissipation structure further comprises a second insulating filler, the second insulating filler is filled in an area between the second end cover and the other axial end of the rotor body, and the third cooling channel is arranged in the second insulating filler.

8. The rotor structure of claim 1, wherein the first heat dissipating structure is a third insulating filler that fills between the windings on adjacent rotor teeth.

9. The rotor structure according to claim 2, wherein the number of the first cooling passages is plural, and the plural first cooling passages are sequentially arranged in a radial direction of the first heat radiation structure.

10. The rotor structure according to claim 9, wherein sectional areas of the plurality of first cooling passages sequentially increase in a radial direction of the first heat radiation structure.

11. An electrically excited synchronous machine comprising a stator and a rotor, the stator being arranged on the periphery of the rotor, the rotor being of a rotor construction according to any one of claims 1 to 10.

12. A vehicle comprising an electrically excited synchronous machine as claimed in claim 11.