Hybrid excitation claw-pole electric machine

Abstract

The application relates to the motor technical field, in particular to a hybrid excitation claw pole motor, which comprises a stator, a permanent magnet rotor and an electric excitation rotor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more particularly to a hybrid excitation claw pole motor. Background Technology

[0002] As an important energy conversion device, the electric motor has a wide range of applications; the claw pole motor is a common and important type of motor; based on the development history and operating principle of the claw pole motor, the claw pole motor can be divided into three categories: electrically excited claw pole motor, permanent magnet claw pole motor, and hybrid excited claw pole motor.

[0003] Hybrid excitation claw pole motors combine the advantages of electrically excited claw pole motors and permanent magnet claw pole motors. Current research on hybrid excitation claw pole motors focuses on parallel hybrid excitation claw pole motors, which connect electrically excited and permanent magnet magnetomotive forces in parallel and add a tangentially magnetized permanent magnet between adjacent claw poles. Compared to traditional claw pole motors, this reduces magnetic leakage between claw poles, improves the utilization rate of the permanent magnet, and thus enhances the motor's efficiency. For example, the motor structure disclosed in publication number CN101741200A, entitled "A Claw Pole Motor," illustrates this.

[0004] However, existing parallel hybrid excitation claw pole motors have two drawbacks:

[0005] ①; The permanent magnets of the motor are arranged in parallel between (or below) the claw poles. This arrangement will cause the permanent magnet magnetic field to be skewed, reduce the utilization rate of the permanent magnets, and result in greater magnetic leakage. The permanent magnets will also have a lower operating point and be prone to demagnetization, which will affect the safe and reliable operation of the motor.

[0006] ②; The shape of the claw pole is similar to a trapezoid, and the cross-sectional area gradually decreases from the end to the free end. This structure causes the axial magnetic flux of the claw pole (along its own length direction) to be uneven. Therefore, the magnetic flux through the axial cross section of this claw pole is not equal. There is an axial magnetic flux in the stator core that does not link with the stator winding, thereby reducing the utilization rate and efficiency of the motor core. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a hybrid excitation claw pole motor, comprising:

[0008] The stator has stator slots and a stator cavity;

[0009] A permanent magnet rotor is disposed within the stator cavity and has a permanent magnet rotor cavity; it includes several permanent magnets arranged at intervals.

[0010] The electric excitation rotor is arranged in the inner cavity of the permanent magnet rotor and has an electric excitation rotor inner cavity, comprising a claw pole rotor assembly and an electric excitation winding; claw poles corresponding to the number of permanent magnets are arranged on the claw pole rotor assembly and are arranged at intervals; the claw poles are arranged along the radial direction of the motor and are located on one side of the permanent magnet rotor, and the horizontal sections of all the claw poles are equal in width;

[0011] The magnetic potential source formed by the permanent magnets is parallel to the magnetic potential source formed by the electric excitation winding;

[0012] The stator, the permanent magnet rotor and the electric excitation rotor have an annular air gap therebetween;

[0013] The magnetic isolation sleeve is arranged between the electric excitation rotor and the permanent magnet rotor;

[0014] The rotating shaft axially penetrates the stator, the claw pole rotor assembly, the permanent magnet rotor and the electric excitation winding.

[0015] Further, the claw pole rotor assembly comprises a first claw pole rotor and a second claw pole rotor which are embedded with each other; the claw poles comprise first claw poles arranged on the first claw pole rotor and second claw poles arranged on the second claw pole rotor; when the first claw pole rotor and the second claw pole rotor are embedded, the first claw poles and the second claw poles are arranged in a staggered manner.

[0016] Further, the second claw pole rotor further comprises an extension part; the extension part is a column structure, and a placing groove is formed on the end face of the extension part; the placing groove forms the rotor inner cavity; the second claw poles are arranged on the groove opening of the placing groove in a circumferential array.

[0017] Further, the first claw pole rotor and the second claw pole rotor are provided with mounting holes for the rotating shaft to penetrate.

[0018] Further, the permanent magnet rotor further comprises an annular sleeve; the permanent magnets are arranged in a circumferential array inside the annular sleeve; the hollow part of the inner ring of the annular sleeve forms the permanent magnet rotor inner cavity.

[0019] Further, the magnetic isolation sleeve comprises a sleeve part and a blocking part; the sleeve part is sleeved on the extension part; the blocking part is arranged at one end of the sleeve part and abuts against the claw poles and the permanent magnet rotor, respectively.

[0020] Compared with the prior art, the present application has the following beneficial effects:

[0021] In this invention, the claw poles of the motor are configured with an equal width structure (along the length direction of the claw pole itself). This makes the cross-sectional area of ​​the claw poles equal in the axial direction (along its own length direction), thereby making the magnetic flux through any axial cross-section of the claw poles equal. Consequently, the air gap magnetic flux distribution in the axial direction of the motor is uniform, effectively improving the problem of uneven axial magnetic flux of the claw poles in the prior art of hybrid excitation motors and improving the output efficiency of the motor. Compared with the claw poles of existing claw pole motors with a claw-like structure, the cross-section of the claw poles gradually decreases in the axial direction (along its own length direction), resulting in unequal magnetic flux through the axial cross-section of the claw poles. Consequently, the air gap magnetic flux distribution in the axial direction of the motor is uneven, which prevents the motor output efficiency from being improved.

[0022] Furthermore, in this invention, since the permanent magnets are not arranged between the claw poles as in traditional parallel hybrid excitation claw pole motors, the magnetomotive force source formed by the permanent magnets and the magnetomotive force source formed by the electrically excited windings are parallel to each other and do not interfere with each other. All permanent magnets are placed in a reasonable magnetic circuit, and all parts of the permanent magnets are contained within the claw pole rotor assembly (not exposed to air, and not prone to high-temperature demagnetization). This ensures both the efficient utilization of the permanent magnets and improves the safe and reliable operation of the motor. Attached Figure Description

[0023] Figure 1 A front view of a hybrid excitation claw pole motor provided by the present invention;

[0024] Figure 2 Rear view of a hybrid excitation claw pole motor provided for this invention;

[0025] Figure 3 A first-view structural schematic diagram of a hybrid excitation claw pole motor provided by the present invention;

[0026] Figure 4 This is a structural schematic diagram of a hybrid excitation claw pole motor from a second perspective, provided by the present invention.

[0027] Figure 5 This is an exploded view of the structure of a hybrid excitation claw pole motor from a first-view perspective, provided by the present invention.

[0028] Figure 6 This is an exploded view of the structure of a hybrid excitation claw pole motor from a second perspective, provided by the present invention.

[0029] Figure 7 for Figure 1 Schematic diagram of the cross section of AA;

[0030] Figure 8 An equivalent magnetic circuit model diagram of the permanent magnet magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0031] Figure 9An equivalent magnetic circuit model diagram of the electrically excited magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0032] Figure 10 This is an equivalent magnetic circuit model diagram of the electric excitation-permanent magnet magnetic path of a traditional parallel hybrid excitation claw pole motor.

[0033] Figure 11 A two-dimensional schematic diagram of the permanent magnet magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0034] Figure 12 A two-dimensional schematic diagram of the electric excitation magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0035] Figure 13 A three-dimensional path diagram of the permanent magnet magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0036] Figure 14 A three-dimensional path diagram of the electric excitation magnetic path in a hybrid excitation claw pole motor provided by the present invention;

[0037] Figure 15 This is a three-dimensional schematic diagram of the permanent magnet magnetic path in a traditional parallel hybrid excitation claw pole motor.

[0038] Figure 16 This is a three-dimensional schematic diagram of the electric excitation magnetic path in a traditional parallel hybrid excitation claw pole motor.

[0039] Figure 17 This is a schematic diagram of the permanent magnet arrangement structure of a hybrid excitation claw pole motor provided in an embodiment of the present invention;

[0040] Figure 18 A schematic diagram of the permanent magnet configuration for a traditional parallel hybrid excitation claw pole motor;

[0041] Figure 19 This is a schematic diagram showing the division of positions 1-4 on the stator of a hybrid excitation claw pole motor provided in the embodiment of the present invention in simulation experiment 1;

[0042] Figure 20 This is a schematic diagram showing the division of positions 1-4 on the stator of a traditional parallel hybrid excitation claw pole motor in simulation experiment 1.

[0043] Figure 21 This is a line graph showing the air gap magnetic flux density distribution at positions 1-4 of a hybrid excitation claw pole motor provided in embodiment 1 of the present invention during simulation experiment 1.

[0044] Figure 22 This is a broken line diagram showing the air gap magnetic flux density distribution at positions 1-4 of the traditional parallel hybrid excitation claw pole motor in simulation experiment 1.

[0045] Figure 23 This is a line graph showing the axial magnetic flux density distribution of the armature teeth at positions 1-4 of a hybrid excitation claw pole motor provided in embodiment 1 of the present invention during simulation experiment 1.

[0046] Figure 24 The image shows a broken line diagram of the axial magnetic flux density distribution of the armature teeth at positions 1-4 of the traditional parallel hybrid excitation claw pole motor in simulation experiment 1.

[0047] Figure 25 The permanent magnet density cloud diagram of a hybrid excitation claw pole motor provided in the embodiment of the present invention in simulation experiment 2;

[0048] Figure 26 The permanent magnet density cloud diagram of the traditional parallel hybrid excitation claw pole motor in simulation experiment 2;

[0049] Figure 27 The simulation diagram shows the permanent magnet utilization rate of a hybrid excitation claw pole motor provided in the embodiment of the present invention in simulation experiment 3.

[0050] Figure 28 The simulation diagram shows the permanent magnet utilization rate of the traditional parallel hybrid excitation claw pole motor in simulation experiment 3.

[0051] In the above attached figures:

[0052] 1. Stator; 11. Stator slot; 12. Armature gear;

[0053] 21. Permanent magnet; 22. Ring-shaped assembly;

[0054] 31. First claw pole rotor; 311. First claw pole; 312. Foundation mounting ring; 32. Second claw pole rotor; 321. Second claw pole; 322. Extension; 3221. Placement slot; 33. Electrically excited winding;

[0055] 4. Magnetic shielding sleeve; 41. Sleeve part; 42. Stop part;

[0056] 5. Shaft; 51. Mounting hole;

[0057] 6. Air gap. Detailed Implementation

[0058] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0059] For ease of description, the embodiments of the present invention include a novel hybrid excitation claw pole motor (hereinafter referred to as the motor of the present invention); and a traditional parallel hybrid excitation claw pole motor (hereinafter referred to as the conventional motor);

[0060] like Figures 1-7As shown: A novel hybrid excitation claw pole motor includes a stator 1 with a circular ring structure. Stator slots 11 are arranged in a circular array on the inner wall of the stator 1 (due to the presence of stator slots 11, armature teeth 12 are also formed in a circular array on the inner wall of the stator 1, and armature windings are wound on the armature teeth 12. The armature windings are not shown in the figure, but they do not affect the subsequent description and understanding). The hollow part of the circular ring structure of the stator 1 constitutes the inner cavity of the stator 1.

[0061] A permanent magnet rotor is disposed within the inner cavity of the stator 1 and has a permanent magnet rotor inner cavity; it includes a plurality of permanent magnets 21 arranged at intervals; in this embodiment, the number of permanent magnets 21 is 12 groups, of which 6 groups are N poles and 6 groups are S poles; the N poles and S poles are arranged at intervals, and the permanent magnets 21 are fixed by an annular ring kit 22, the hollow part inside the annular kit 22 constitutes the permanent magnet rotor inner cavity;

[0062] An electrically excited rotor is disposed within the cavity of a permanent magnet rotor and has an electrically excited rotor cavity, including a claw pole rotor assembly and an electrically excited winding 33; the claw pole rotor assembly is provided with claw poles that correspond to the number of permanent magnets 21 and are spaced apart; the claw poles are arranged radially along the motor and located on one side of the permanent magnet rotor, and all claw poles have the same horizontal cross-section width; in this embodiment, the number of claw poles is 12 sets, corresponding to the number of permanent magnets 21;

[0063] In this invention, since the permanent magnet 21 is not positioned between the claw poles as in a traditional parallel hybrid excitation claw pole motor, the magnetomotive force source formed by the permanent magnet 21 is parallel to the magnetomotive force source formed by the electrically excited winding 33. Consequently, the electrically excited magnetic flux and the permanent magnet magnetic flux are also parallel to each other and do not intersect. The advantage of this arrangement is that the two magnetic paths do not interfere with each other, and the electrically excited magnetic flux does not affect the permanent magnet magnetic flux. This improves the output efficiency of the motor and effectively protects the permanent magnet 21 when the input current of the electrically excited winding 33 is too large. If the electrically excited magnetic flux and the permanent magnet magnetic flux intersect, and the input current of the electrically excited winding 33 is too large, the electrically excited magnetomotive force will act on the permanent magnet 21, causing irreversible demagnetization of the permanent magnet 21. (For example, in the background section, the announcement number CN1017...) The 41200A motor structure disclosed in the title "A Claw Pole Motor" adopts a tangential magnetization method. When the permanent magnet is energized, its magnetic circuit is as follows: starting from the N pole of the permanent magnet, passing through the corresponding S pole claw pole, the air gap, the stator part, and then through the air gap again, the N pole claw pole returns to the S pole claw pole. When electrically energized: starting from the N pole claw pole, passing through the air gap, the stator part, and exiting the air gap, it returns to the S pole claw pole. However, since the permanent magnet is set between the poles, the magnetic flux of the electrically energized part will pass through the permanent magnet circuit again, which can easily cause irreversible demagnetization of the permanent magnet. In the embodiment of the present invention, since the magnetomotive force source formed by the permanent magnet 21 is parallel to the magnetomotive force source formed by the electrically energized winding 33, the permanent magnet magnetic path and the electrically energized magnetic path are parallel (i.e., independent and non-intersecting) in the embodiment of the present invention, so the above problem will not occur.

[0064] There is an annular air gap 6 between the stator 1 and the permanent magnet rotor and the electrically excited rotor;

[0065] The magnetic isolation sleeve 4 is set between the electrically excited rotor and the permanent magnet rotor to isolate the mutual magnetic leakage between the permanent magnet flux and the electrically excited flux.

[0066] The rotating shaft 5 axially passes through the stator 1, the claw pole rotor assembly, the permanent magnet rotor, and the electrically excited winding 33.

[0067] In the motor of the present invention, the main magnetic flux under a set of poles consists of two parts: the main magnetic flux generated by the excitation winding and the main magnetic flux generated by the permanent magnet 21.

[0068] When the annular structure of the electric excitation winding 33 is energized, a magnetic field is established. This magnetic field starts from one claw pole, passes through the air gap 6, armature tooth 12, stator 1 core, and closes at the other claw pole, thus forming a magnetic flux loop.

[0069] The permanent magnet 21 generates radial magnetic flux, which starts from one permanent magnet 21, passes through the air gap 6, armature teeth 12, stator core 1, and closes after reaching another adjacent permanent magnet 21, thus forming another magnetic flux loop.

[0070] exist Figures 8-10 Chinese: R s-add For the stator back yoke reluctance, R s-yoke R s-tooth R g These are the stator yoke reluctance, stator tooth reluctance, and air gap reluctance, respectively; R claw R pm These are the claw pole reluctance and the permanent magnet reluctance, respectively; R t For the rotor yoke magnetic reluctance, F field F pm For electrically excited magnetomotive force and permanent magnet excited magnetomotive force;

[0071] from Figure 8 , Figure 9 As can be seen from the present invention, in the motor of the present invention, the electric excitation magnetic circuit and the permanent magnet magnetic circuit are independent of each other (i.e. parallel) and there is no intersection of the magnetic circuits. The two magnetic paths do not interfere with each other, and the electric excitation magnetic flux will not affect the permanent magnet magnetic flux. This not only improves the output efficiency of the motor, but also effectively protects the permanent magnet 21 when the input current of the electric excitation winding 33 is too large.

[0072] And from Figure 10 As can be seen, due to the limitations of traditional motor structure, the electrically excited magnetic circuit and the permanent magnet magnetic circuit are connected in parallel and have some identical paths and common magnetic circuit intersections. The two magnetic circuits will interfere with each other, ultimately affecting the motor efficiency.

[0073] Figures 13-16It can be seen that the paths of the electrically excited-permanent magnet magnetic circuits of the motor of this invention and the conventional motor are shown in the three-dimensional model. The solid lines in the figure represent the permanent magnet magnetic circuit and the electrically excited magnetic circuit, respectively. Figure 13 , Figure 14 As can be seen from the three-dimensional model, the electrically excited magnetic circuit and the permanent magnet magnetic circuit of the motor of this invention are independent of each other (i.e., parallel); while Figure 15 , Figure 16 In the diagram, the dashed line represents a leakage flux path. This leakage flux path partially overlaps with both the permanent magnet path and the electrically excited path of a traditional motor, and they share the same path intersection points (i.e., Figure 15 , Figure 16 (From this point on) it can also be proven that the electric excitation magnetic circuit of a traditional motor intersects with the permanent magnet magnetic circuit;

[0074] In this embodiment, the main structure of the claw pole is a rectangle of equal width. Therefore, the cross-sectional area of ​​the claw pole in the axial direction (along its own length direction) is equal, which makes the magnetic flux through any axial section of the claw pole equal. Consequently, the magnetic flux density distribution of the air gap 6 in the axial direction of the motor is uniform. Compared with the claw pole of the existing claw pole motor, which has a claw-like structure, the cross-section of the claw pole in the axial direction (along its own length direction) gradually becomes smaller. Therefore, the magnetic flux through the axial section of the claw pole (along its own length direction) is not equal, which leads to uneven magnetic flux density distribution in the air gap 6 in the axial direction, and the output efficiency of the motor cannot be improved. However, the medium-width claw pole of this invention has a uniform magnetic flux distribution in the axial section (along its own length direction). The equal magnetic flux through the axial section of the claw pole (along its own length direction) can effectively improve the output efficiency of the motor.

[0075] The claw pole rotor assembly includes a first claw pole rotor 31 and a second claw pole rotor 32 that are interlocked; the claw pole includes a first claw pole 311 disposed on the first claw pole rotor 31 and a second claw pole 321 disposed on the second claw pole rotor 32; when the first claw pole rotor 31 and the second claw pole rotor 32 are interlocked, the first claw pole 311 and the second claw pole 321 are arranged alternately, corresponding to the spaced arrangement structure of the N pole and S pole of the permanent magnet 21.

[0076] The second claw pole rotor 32 further includes an extension 322; the extension 322 is a cylindrical structure (in this embodiment, it is a cylindrical structure), and an annular placement groove 3221 is provided on its end face; the placement groove 3221 constitutes the inner cavity of the electrically excited rotor; the second claw poles 321 are arranged in a circumferential array on the opening of the placement groove 3221 and extend toward the radial direction of the motor; the first claw pole rotor 31 includes a base mounting ring 312, and the first claw poles 311 are arranged in a circumferential array on the outer circular surface of the base mounting ring 312; when the first claw pole rotor 31 and the second claw pole rotor 32 are engaged, the first claw pole rotor 31 is engaged at the end of the second claw pole rotor 32 where the placement groove 3221 is provided.

[0077] The first claw pole rotor 31 and the second claw pole rotor 32 are provided with mounting holes 51 for the rotating shaft 5 to pass through. It should be explained that the hollow part on the base mounting ring 312 of the first claw pole rotor 31 constitutes the mounting hole 51 of the first claw pole rotor 31.

[0078] The permanent magnet rotor also includes an annular assembly 22; the permanent magnets 21 are arranged in a circular array and disposed inside the annular assembly 22. Specifically, mounting slots are provided in a circular array on the annular assembly 22, and the permanent magnets 21 are placed in the mounting slots with N poles and S poles spaced apart; the hollow inner ring of the annular assembly 22 constitutes the inner cavity of the permanent magnet rotor.

[0079] The magnetic shielding sleeve 4 includes a sleeve portion 41 and a stop portion 42; the sleeve portion 41 is an annular structure that extends toward the axial direction of the motor and is sleeved on the extension portion 322; the stop portion 42 is also an annular structure that extends toward the radial direction of the motor, is disposed on one end face of the sleeve portion 41, and abuts against the claw pole (including the first claw pole 311 and the second claw pole 321) and the permanent magnet rotor respectively; the magnetic shielding sleeve 4 is made of magnetic shielding material to avoid the axial leakage magnetic flux affecting the magnetic adjustment performance of the motor.

[0080] In this implementation case, the stator 1 is made of cold-rolled steel material DW315-50 silicon steel sheets laminated together, and its claw pole rotor part is made of No. 10 steel material directly cast. Similarly, the permanent magnet rotor part is made of the same cold-rolled steel silicon steel sheet material DW315-50 as the stator 1 core material. The permanent magnet 21 material is neodymium iron boron NdFe30 and is radially magnetized.

[0081] from Figure 17 and Figure 18 As can be seen, the permanent magnet arrangement structure of the motor of the present invention differs from that of a conventional motor. Although the permanent magnet 21 of the conventional motor is also arranged between the claw poles, it is... Figure 18 As can be clearly seen from the elliptical circle, a portion of the permanent magnet 21 is still exposed to the air (from a side view, it is not completely blocked by the claw poles). Therefore, under the same material and volume conditions, the utilization rate of the permanent magnet 21 in the conventional motor is lower than that in the motor of the present invention. In addition, since the permanent magnet 21 in the conventional motor is partially exposed to the air between the rotor claw poles, when the motor is in operation, it is easy to cause the temperature to rise too high, which may cause the permanent magnet 21 to demagnetize.

[0082] Simulation Experiment 1:

[0083] To verify the difference in performance parameters between the motor of this invention and a conventional motor, three-dimensional finite element analysis software was used. Under the conditions that the number and volume of permanent magnets 21 were equal, and the electrical excitation current was equal, four different positions were taken along the axial direction of the stator 1 of both motors, respectively denoted as position 1, position 2, position 3, and position 4 (positions 1-4 were selected as follows). Figure 19 , Figure 20 (As shown); and simulated and compared the magnetic flux density distribution of the air gap 6 and the axial magnetic flux density distribution of the armature tooth 12 at four locations; the comparison results were plotted as a line graph using software, as shown. Figures 21-24 As shown;

[0084] from Figure 21 , Figure 22 As can be seen, as the axial position changes continuously, the air gap magnetic flux density of the motor of the present invention and the conventional motor are uniformly distributed in the axial position; however, the amplitude of the air gap magnetic flux density of the motor of the present invention is always greater than that of the conventional motor.

[0085] from Figure 23 , Figure 24 As can be seen, the axial magnetic flux density amplitude of the armature teeth 12 of the motor of the present invention is much greater than that of the conventional motor. The axial magnetic flux density of the armature teeth 12 of the conventional motor is almost negligible. Due to the partial leakage flux between the stator winding 1 and the stator 1, the axial magnetic flux density of the armature teeth 12 of the conventional motor is less than that of the motor of the present invention.

[0086] Simulation Experiment 3:

[0087] like Figure 25 , 26 As shown: Using three-dimensional finite element analysis software, the magnetic flux density of the permanent magnet 21 of the motor of the present invention and the conventional motor under no-load static field conditions is analyzed; wherein permanent magnets 21 of equal volume and the same material are selected.

[0088] from Figure 25 , 26 As can be seen, the magnetic flux density of the permanent magnet 21 in this invention is significantly higher than that of a traditional motor; it should be noted that, in conjunction with Figure 25 , 26 Use the color-magnetic flux density reference chart in the left half of the image to observe the magnetic flux density cloud map of the permanent magnet in the right half; the closer the color is to blue, the weaker the magnetic flux density; the closer the color is to red, the stronger the magnetic flux density; it can be clearly seen that... Figure 25 The magnetic flux density is constantly higher than Figure 26 .

[0089] Simulation Experiment 2:

[0090] Figure 27 and Figure 28To simulate the utilization rate of permanent magnet 21 using three-dimensional finite element analysis software, the condition was that permanent magnet 21 was energized alone.

[0091] exist Figure 10 The upper half of the image shows a portion of the structure of the motor of this invention. Figure 11 The upper half of the image shows a portion of the structure of a traditional motor;

[0092] The magnetic field strength of the motor of this invention and the conventional motor were simulated and analyzed using three-dimensional finite element analysis software.

[0093] The magnetic field distribution of the prototype is as follows Figure 27 , 28 As shown in the lower half of each figure; it can be seen that when the permanent magnet 21 is energized alone, the magnetic field strength of the motor of the present invention is significantly higher than that of the conventional motor. This also indicates that in this embodiment, the permanent magnet 21 disposed next to the claw pole improves the utilization rate of the permanent magnet 21 compared to the permanent magnet 21 disposed between the poles previously. It should be noted here that... Figure 27 , 28 The lower half of each image shows a rendering of the magnetic field strength of the motor of this invention and a conventional motor. The closer the color is to yellow (represented as a lighter color in the image), the stronger the magnetic field; the closer the color is to blue (represented as a darker color in the image), the weaker the magnetic field. It can be clearly seen that... Figure 27 The magnetic field strength is significantly higher than Figure 28 .

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A hybrid excitation claw pole electric machine characterized by, The application relates to a motor, which comprises the following parts: a stator with stator slots and a stator inner cavity; a permanent magnet rotor arranged in the stator inner cavity and having a permanent magnet rotor inner cavity, and comprising a plurality of interval-arranged permanent magnets; an electric excitation rotor arranged in the permanent magnet rotor inner cavity and having an electric excitation rotor inner cavity, and comprising a claw pole rotor assembly and an electric excitation winding; the electric excitation winding is arranged inside the electric excitation inner cavity; the claw pole rotor assembly is provided with claw poles corresponding to the number of the permanent magnets and arranged at intervals; the claw poles are arranged along the radial direction of the motor and located on one side of the permanent magnet rotor, and the horizontal sections of all the claw poles are equal in width; there is an annular air gap between the stator and the permanent magnet rotor and the electric excitation rotor; a magnetic isolation sleeve arranged between the electric excitation rotor and the permanent magnet rotor; a rotating shaft axially penetrating the stator, the claw pole rotor assembly, the permanent magnet rotor and the electric excitation winding; the claw pole rotor assembly comprises a first claw pole rotor and a second claw pole rotor which are embedded with each other; the claw pole comprises a first claw pole arranged on the first claw pole rotor and a second claw pole arranged on the second claw pole rotor; when the first claw pole rotor and the second claw pole rotor are embedded, the first claw pole and the second claw pole are arranged in a staggered mode; the second claw pole rotor further comprises an extension part which is a column structure and has a placing groove arranged on the end face; the placing groove constitutes the electric excitation rotor inner cavity; the second claw pole is arranged on the groove opening of the placing groove in a circumferential array mode.

2. A hybrid excitation claw pole machine as claimed in claim 1, characterized in that mounting holes are arranged on the first claw pole rotor and the second claw pole rotor for the rotating shaft to penetrate.

3. A hybrid excitation claw pole machine as claimed in claim 1, characterized in that the permanent magnet rotor further comprises an annular sleeve; the permanent magnets are arranged in a circumferential array mode inside the annular sleeve; the hollow part of the inner ring of the annular sleeve constitutes the permanent magnet rotor inner cavity.

4. A hybrid excitation claw pole machine as claimed in claim 1, characterized in that the magnetic isolation sleeve comprises a sleeve part and a blocking part; the sleeve part is sleeved on the extension part; the blocking part is arranged at one end of the sleeve part and abuts against the claw pole and the permanent magnet rotor respectively.

Images