Excitation motor and rotor thereof

Abstract

The application provides an excitation motor and a rotor thereof. The rotor has a core (10) comprising a yoke (11) and a plurality of main magnetic poles (12) which are detachably connected. The main magnetic poles (12) surround the yoke (11), and circumferentially adjacent main magnetic poles (12) abut each other at a pole shoe (122), so that the outer circumferential surface of the core (10) has no gap. The rotor of the excitation motor according to the application contains a large number of windings, so that the excitation resistance is low, the motor efficiency is high, and the rotor is not prone to temperature rise. The rotor according to the application has the same advantages.

Description

Technical Field

[0001] This application relates to the field of electric motors, and more specifically to an excitation motor and its rotor. Background Technology

[0002] An exciter motor consists of a stator and a rotor. The rotor has magnetic pole assemblies distributed and connected along the circumference. The magnetic pole assemblies are mainly composed of an iron core and excitation windings. Inputting alternating current into the stator coils generates a rotating magnetic field, while inputting direct current into the rotor excitation windings generates a magnetic pole magnetic field. The interaction of these two magnetic fields drives the rotor to rotate.

[0003] Figure 1 and Figure 2 The figure shows a rotor and its core of an excitation motor. As can be seen from the figure, a gap is formed between adjacent main magnetic poles 11 of the core 10, so that the winding slot RW is formed as an open slot. The winding W is embedded into the winding slot RW through the gap.

[0004] However, the efficiency of the aforementioned excitation motor is limited. With technological advancements, improving motor efficiency and speed while simultaneously reducing motor temperature rise has become a research hotspot in motor design. Utility Model Content

[0005] The purpose of this application is to overcome or at least mitigate the shortcomings of the prior art and to provide an excitation motor and its rotor.

[0006] According to a first aspect of this application, a rotor for an excitation motor is provided, the rotor core including a yoke detachably connected to the rotor and a plurality of main magnetic poles, the plurality of main magnetic poles being arranged around the yoke.

[0007] The pole shoes of adjacent main magnetic poles in the circumferential direction of the rotor abut against each other, so that there are no gaps on the outer peripheral surface of the iron core.

[0008] In at least one embodiment, the yoke is made of non-oriented steel, and the main magnetic pole is made of oriented steel.

[0009] In at least one embodiment, the magnetic direction of the main magnetic pole is along the radial direction of the rotor.

[0010] In at least one embodiment, the rotor further includes a sheath disposed on the outer periphery of the iron core.

[0011] In at least one embodiment, the sheath is a carbon fiber sheath.

[0012] In at least one embodiment, a plurality of first mating portions are formed on the outer peripheral side of the yoke, and a second mating portion is formed on the inner peripheral side of each main magnetic pole, and each of the first mating portions and a second mating portion are assembled together with each other.

[0013] In at least one embodiment, the first mating portion is a protruding key portion, and the second mating portion is a keyway; or

[0014] The second mating part is a protruding key, and the first mating part is a keyway.

[0015] In at least one embodiment, an adhesive is provided between the first mating portion and the second mating portion.

[0016] In at least one embodiment, an adhesive is provided between adjacent pole shoes in the rotor circumferential direction.

[0017] According to a first aspect of this application, an excitation motor is provided, including a stator and a rotor according to the first aspect of this application.

[0018] The excitation motor according to this application accommodates more windings within the same external dimensions, resulting in lower excitation resistance, higher motor efficiency, and less rotor temperature rise. The rotor according to this application has the same advantages. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the rotor of a typical excitation motor in the prior art.

[0020] Figure 2 yes Figure 1 A schematic diagram of the corresponding rotor core.

[0021] Figure 3 This is a schematic diagram of the rotor of an excitation motor according to one embodiment of this application.

[0022] Figure 4 yes Figure 3 A schematic diagram of the corresponding rotor without windings.

[0023] Figure 5 yes Figure 4 A cross-sectional view perpendicular to the axis.

[0024] Figure 6 yes Figure 3 A schematic diagram of the yoke of the corresponding rotor.

[0025] Figure 7 and Figure 8 This is a schematic diagram of two possible main magnetic poles of the rotor of the excitation motor according to this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] 10 Iron core; 11 Yoke; 110 First mating part; 12 Main magnetic pole; 121 Pole body; 122 Pole shoe; 120 Second mating part; 20 Carbon fiber sheath; W winding; RW insert groove. Detailed Implementation

[0028] Exemplary embodiments of this application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are for teaching those skilled in the art how to implement this application only, and are not intended to exhaustively describe all possible methods of this application, nor to limit the scope of this application.

[0029] Reference Figures 3 to 8 This application describes the rotor of an excitation motor according to one embodiment of the present application.

[0030] Unless otherwise specified, the terms radial, axial, and circumferential refer to the radial, axial, and circumferential directions of the rotor below.

[0031] The rotor according to this embodiment includes an iron core 10, a carbon fiber sheath 20, and a winding W.

[0032] Multiple (six in this embodiment) winding slots RW are formed inside the iron core 10, and the winding W is partially embedded in the winding slots RW. The carbon fiber sheath 20 is disposed on the outer periphery of the iron core 10, which serves to hold the iron core 10 in place, so that the iron core 10 can withstand greater centrifugal force during rotation.

[0033] The yoke 11 and main magnetic poles 12 of the iron core 10 are separate components, but are connected together by assembly. The yoke 11 is generally cylindrical, and multiple (six in this embodiment) main magnetic poles 12 are arranged around the yoke. The yoke 11 and the main magnetic poles 12 are assembled together by a snap-fit ​​mechanism. Specifically, multiple (six in this embodiment) protruding key-shaped first mating portions 110 are formed on the outer periphery of the yoke 11, and a recessed keyway-shaped second mating portion 120 is formed on the inner periphery of each main magnetic pole 12 (i.e., the inner periphery of the pole body 121, or the inner periphery of the teeth). The first mating portions 110 and the second mating portions 120 can be fitted together with each other.

[0034] It should be understood that, in other possible embodiments, the first mating portion 110 and the second mating portion 120 may also have other structures, and this application does not limit them. For example, the first mating portion 110 may be a recessed keyway, and the second mating portion 120 may be a protruding key-shaped structure.

[0035] Optionally, an adhesive may be provided between the first mating part 110 and the second mating part 120 to enhance the connection strength between the yoke 11 and the main magnetic pole 12.

[0036] Optionally, an adhesive is provided between adjacent pole shoes 122 to enhance the structural stability between each main magnetic pole 12.

[0037] Because the yoke 11 and the main magnetic pole 12 are separate components, they can be made of different materials. The yoke 11 is made of non-oriented steel, while the main magnetic pole 12 is made of oriented steel, with the magnetic conductivity of the oriented steel along the radial direction of the rotor. This arrangement enhances the magnetic permeability of the rotor's magnetic circuit, thereby improving the motor's power performance.

[0038] After the yoke 11 and the main magnetic poles 12 are assembled, the pole shoes 122 of the circumferentially adjacent main magnetic poles 12 abut against each other, so that there is no gap on the outer peripheral surface of the iron core 10, or in other words, the inlay groove RW formed between the adjacent main magnetic poles 12 is closed on the outer peripheral side.

[0039] Compared to open slots in existing technologies, closed winding slots RW have a larger winding volume and can accommodate more windings W, thereby reducing the excitation resistance of the rotor and improving motor efficiency and reducing rotor temperature rise.

[0040] In addition, the circumferentially adjacent main magnetic poles 12 abutting together make the overall structural strength of the iron core 10 greater; and for the spliced ​​iron core, the NVH generated during rotor rotation is smaller.

[0041] With the outer periphery of the winding groove RW closed, this application does not limit the specific shape of the winding groove RW. Depending on the shape of the pole shoe 122, the cross-section of the winding groove RW perpendicular to the axial direction will be formed in different shapes. For example, Figure 7 and Figure 8 Two different shapes of main magnetic poles 12 are shown, and the pole shoes 122 of these two main magnetic poles 12 have different shapes on their inner circumferential sides. Of course, where structural strength allows, Figure 8 The slot formed by the pole shoe 122 shown has a larger cross-sectional area and can accommodate more windings, so it is more recommended.

[0042] For the specific process of rotor winding, for example, the winding W can be wound onto the pole body 121 of the main magnetic pole 12 first; then the main magnetic pole 12 with the winding W wound on it can be spliced ​​onto the yoke 11.

[0043] Considering that the main magnetic poles 12 are made of oriented steel with the magnetic direction set radially, there will be basically no magnetic leakage at the pole shoe 122 where adjacent main magnetic poles 12 are in contact with each other, that is, the magnetic leakage will not increase due to the contact between adjacent main magnetic poles 12.

[0044] A carbon fiber sheath 20 is fitted around the outer periphery of the iron core 10. The carbon fiber sheath 20 can be wound around the outer periphery of the iron core 10 by fiber winding; or it can be a pre-formed ring-shaped component, which is then fitted onto the outer periphery of the iron core 10.

[0045] The carbon fiber sheath 20 plays a role in stabilizing the structure of the spliced ​​iron core 10 on the one hand, and on the other hand, it strengthens the structure of the entire rotor, enabling the rotor to withstand greater centrifugal force and thus achieve higher speed.

[0046] In other possible implementations, the carbon fiber sheath 20 may also be a sheath made of other materials, such as a sheath made of glass fiber.

[0047] It should be understood that some aspects or features of the above-described embodiments can be appropriately combined.

[0048] It is understood that this application also provides an excitation motor including the above-described rotor.

[0049] This application has at least one of the following advantages:

[0050] (i) By setting the rotor core in a split structure, adjacent pole shoes can abut against each other, i.e., the winding slots can be formed as closed slots without affecting the winding installation. As a result, more windings can be accommodated in the winding slots, thereby reducing the rotor's excitation resistance and achieving the effects of improving motor efficiency and reducing rotor temperature rise.

[0051] (ii) The split-type core allows the use of different materials in different parts, with non-oriented steel used in the yoke and oriented steel used in the main magnetic poles, with the magnetic conduction direction along the radial direction of the rotor. This configuration enhances the magnetic permeability of the rotor magnetic circuit and improves the power performance of the motor.

[0052] (iii) The sheath set on the outer periphery of the iron core makes the spliced ​​main magnetic poles have greater structural stability on the one hand, and enables the rotor to withstand greater centrifugal force during rotation on the other hand.

[0053] Of course, this application is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the above-described embodiments of this application under the guidance of this application, without departing from the scope of this application.

Claims

1. A rotor for an excitation motor, characterized in that, The rotor core (10) includes a yoke (11) that is detachably connected and a plurality of main magnetic poles (12) arranged around the yoke (11). The pole shoes (122) of adjacent main magnetic poles (12) in the circumferential direction of the rotor abut against each other, so that there is no gap on the outer peripheral surface of the iron core (10).

2. The rotor of the excitation motor according to claim 1, characterized in that, The yoke (11) is made of non-oriented steel, and the main magnetic pole (12) is made of oriented steel.

3. The rotor of the excitation motor according to claim 2, characterized in that, The magnetic direction of the main magnetic pole (12) is along the radial direction of the rotor.

4. The rotor of the excitation motor according to claim 1, characterized in that, The rotor also includes a sheath disposed on the outer periphery of the iron core (10).

5. The rotor of the excitation motor according to claim 4, characterized in that, The sheath is a carbon fiber sheath.

6. The rotor of the excitation motor according to claim 1, characterized in that, A plurality of first mating parts (110) are formed on the outer periphery of the yoke (11), and a second mating part (120) is formed on the inner periphery of the pole body (121) of each main magnetic pole (12). Each first mating part (110) and a second mating part (120) are assembled together with each other.

7. The rotor of the excitation motor according to claim 6, characterized in that, The first mating part (110) is a protruding key, and the second mating part (120) is a keyway; or The second mating part (120) is a protruding key part, and the first mating part (110) is a keyway.

8. The rotor of the excitation motor according to claim 6, characterized in that, An adhesive is provided between the first mating part (110) and the second mating part (120).

9. The rotor of the excitation motor according to claim 1, characterized in that, An adhesive is provided between adjacent pole shoes (122) in the circumferential direction of the rotor.

10. An excitation motor, characterized in that, It includes a stator and a rotor according to any one of claims 1 to 9.

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