Rotor assembly and hybrid excitation motor

Abstract

The utility model relates to a rotor assembly and a hybrid excitation motor, the rotor assembly comprises a rotor, a permanent magnet and an excitation winding, and the rotor comprises a rotor yoke and a plurality of rotor salient poles; in the circumferential direction of the rotor, the multiple rotor salient poles are arranged on the rotor yoke at intervals, the permanent magnets are arranged on the rotor salient poles, and the excitation windings are wound around the rotor salient poles and arranged on the outer sides of the permanent magnets. By adjusting the magnitude and the direction of the current of the excitation winding, the permanent magnetic field of the permanent magnet can be enhanced or weakened, and the effect of increasing or weakening the magnetic field is realized, so that the total magnetic field intensity of the rotor assembly is regulated and controlled, and the use requirements of the hybrid excitation motor under different working conditions can be met; and the motor efficiency and the power performance at a high rotating speed are improved. Besides, the excitation winding can restrain and fix the permanent magnets, the structural stability of the rotor assembly is improved, the rotor assembly of the structure is simple in structure and convenient to prepare and implement, the structural complexity of the hybrid excitation motor can be reduced, and the preparation cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor assembly and a hybrid excitation motor. BACKGROUND

[0002] Permanent magnet synchronous motor is a widely used type of electric machine, with high efficiency, good dynamic response performance, low noise and other advantages, and is widely used in new energy vehicles and other fields. The working principle of the permanent magnet synchronous motor is based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnets on the rotor. The rotor is installed with pre-magnetized permanent magnets, which can generate strong magnetic field when rotating, thereby providing greater output torque. Due to the high cost of permanent magnets, and the need for armature current vector control on the stator for field weakening at high speed, the power, torque and other performance of the motor are attenuated, and the hybrid excitation motor, as a solution that balances high efficiency and low cost, has begun to attract attention.

[0003] The hybrid excitation motor is usually composed of a stator, a rotor, an excitation winding and permanent magnets, and is a motor that combines the two excitation sources of field excitation winding and permanent magnet. Among them, the hybrid excitation motor generates the main magnetic field of the motor by the two excitation sources, realizes the adjustment and control of the main magnetic field of the motor, and achieves the effect of magnetic enhancement and field weakening, and there are various implementation ways on the structure. However, the structure of the existing hybrid excitation motor is relatively complex, the process difficulty is large, and the cost is high. CONTENT OF THE INVENTION

[0004] Therefore, the present application provides a rotor assembly and a hybrid excitation motor to solve the problem of complex structure, large process difficulty and high cost of the hybrid excitation motor in the prior art.

[0005] The first aspect of the embodiment of the present application provides a rotor assembly, which comprises a rotor, a permanent magnet and an excitation winding, wherein the rotor comprises a rotor yoke and a plurality of rotor salient poles; the plurality of rotor salient poles are arranged at intervals on the rotor yoke along the circumference of the rotor, the permanent magnet is arranged on the rotor salient pole, and the excitation winding is wound on the rotor salient pole and arranged outside the permanent magnet.

[0006] In the present application, by adjusting the size and direction of the current of the excitation winding, the permanent magnet magnetic field of the permanent magnet can be enhanced or weakened, the functions of magnetic enhancement or field weakening are realized, the total magnetic field intensity of the rotor assembly is regulated, the use requirements of the hybrid excitation motor under different working conditions can be met, and the motor efficiency and dynamic performance under high speed are improved. Since the excitation magnetic field generated by the excitation winding can enhance the permanent magnet magnetic field of the permanent magnet, the setting of the excitation winding can also reduce the amount of the permanent magnet, thereby reducing the manufacturing cost of the hybrid excitation motor. When the hybrid excitation motor is running at no load, the total magnetic field intensity of the rotor assembly can be reduced by adjusting the current of the excitation winding to reduce the drag loss, without the need to increase the disengaging device such as a clutch, and the manufacturing cost can be further reduced. In addition, the excitation winding and the permanent magnet are arranged on each rotor salient pole, which can facilitate the excitation magnetic field generated by the excitation winding to enhance or weaken the permanent magnet magnetic field generated by the permanent magnet, reduce the coordination difficulty of the excitation magnetic field and the permanent magnet magnetic field, and thus reduce the output torque fluctuation of the motor. At the same time, the excitation winding arranged on the outer side of the permanent magnet can also constrain and fix the permanent magnet, improve the structural stability of the rotor assembly, and the structure of the rotor assembly is simple, which facilitates the preparation and implementation, reduces the structural complexity of the hybrid excitation motor, and further reduces the manufacturing cost.

[0007] In a possible design, the permanent magnets are arranged on opposite sides of the rotor salient poles along the circumferential direction of the rotor.

[0008] This structure can reduce the difficulty of arranging the permanent magnets on the rotor salient poles, facilitate the preparation of the rotor assembly, and reduce the structural complexity of the hybrid excitation motor

[0009] In a possible design, the permanent magnet includes a first magnetic pole and a second magnetic pole, and the first magnetic pole and the second magnetic pole are arranged in sequence along the radial direction of the rotor.

[0010] This structure can make the permanent magnet form a permanent magnet magnetic field along the radial direction of the rotor, facilitate the rotor salient pole to form a total magnetic field along the radial direction of the rotor, and thus facilitate the cooperation of the rotor assembly and the stator assembly, and reduce the structural complexity of the hybrid excitation motor.

[0011] In a possible design, the excitation winding is used to generate a third magnetic pole and a fourth magnetic pole, and the third magnetic pole and the fourth magnetic pole are arranged in sequence along the radial direction of the rotor.

[0012] This structure can make the excitation winding generate an excitation magnetic field along the radial direction of the rotor after the excitation winding is supplied with an excitation current, further facilitate the excitation magnetic field generated by the excitation winding to enhance or weaken the permanent magnet magnetic field generated by the permanent magnet, and reduce the coordination difficulty of the excitation magnetic field and the permanent magnet magnetic field.

[0013] In a possible design, the magnetic pole directions of the permanent magnets located on the same rotor salient pole are the same, and the magnetic pole directions of the permanent magnets located on two adjacent rotor salient poles are opposite, so that the hybrid excitation motor can effectively utilize the magnetic field during operation, thereby improving the efficiency of the hybrid excitation motor.

[0014] In a possible design, the permanent magnets are attached to surfaces of the rotor salient poles, and / or the permanent magnets are embedded in the interiors of the rotor salient poles, so as to improve the design freedom of the rotor assembly.

[0015] In a possible design, the rotor assembly further includes a bracket, the bracket is mounted on the rotor salient pole, and the permanent magnet is mounted on the bracket.

[0016] In this structure, the bracket can be used to fix the permanent magnet, thereby improving the connection stability of the permanent magnet on the rotor salient pole, and the bracket can position the relative position of the permanent magnet and the rotor, thereby further improving the structural stability of the rotor assembly.

[0017] In a possible design, the bracket is provided with a first groove on the side away from the rotor salient pole, and the permanent magnet is mounted in the first groove.

[0018] This structure can facilitate the mounting and connection of the bracket on the side close to the rotor salient pole and the rotor salient pole, and the first groove can facilitate the mounting and fixing of the permanent magnet, thereby ensuring the relative position of the permanent magnet and the rotor and further improving the structural stability of the rotor assembly.

[0019] In a possible design, the bracket includes a support plate, a first flange and a second flange, the first flange and the second flange are provided on the side of the support plate away from the rotor salient pole, and the first flange and the second flange are provided on opposite sides of the support plate in the radial direction of the rotor, and the support plate, the first flange and the second flange form the first groove.

[0020] In this structure, the first flange and the second flange can limit the displacement of the permanent magnet in the radial direction of the rotor, thereby ensuring the relative position of the permanent magnet and the rotor, improving the fixing effect of the permanent magnet, and the structure of the bracket is simple and facilitates the preparation and formation, thereby further reducing the structural complexity of the hybrid excitation motor and saving the preparation cost.

[0021] In a possible design, the bracket is provided with a second groove on the side close to the rotor salient pole, and at least part of the rotor salient pole is arranged in the second groove.

[0022] In this structure, the bracket can be clamped on the rotor salient pole through the second groove, thereby facilitating the connection of the bracket and the rotor salient pole and improving the connection reliability of the bracket and the rotor salient pole.

[0023] In a possible design, the bracket further includes a third flange and a fourth flange, the third flange and the fourth flange are arranged on the side of the support plate close to the rotor salient pole, and the third flange and the fourth flange are arranged on opposite sides of the support plate in the axial direction of the rotor, and the support plate, the third flange, the fourth flange, and the rotor salient pole form a second slot.

[0024] In this structure, the third flange and the fourth flange can be located on opposite sides of the rotor salient pole in the axial direction of the rotor, so that the bracket can be stably clamped on the rotor salient pole, and the structure of the bracket is simple and convenient to manufacture, which can further reduce the structural complexity of the hybrid excitation motor and save manufacturing costs.

[0025] In a possible design, at least part of the third flange and the fourth flange extends away from the rotor salient pole and is connected with the first flange and the second flange.

[0026] In this structure, the first flange and the second flange can also limit the displacement of the permanent magnet in the axial direction of the rotor, so as to further improve the fixing effect of the bracket on the permanent magnet, ensure the relative position of the permanent magnet and the rotor, and improve the structural stability of the rotor assembly.

[0027] In a possible design, an installation space is formed between the side of the bracket close to the rotor salient pole and the rotor salient pole, and the permanent magnet is arranged in the installation space.

[0028] In this structure, the permanent magnet is arranged in the installation space between the bracket and the rotor salient pole, which can improve the fixing effect of the permanent magnet and further improve the structural stability of the rotor assembly.

[0029] In a possible design, the bracket includes a support plate, a fifth flange, and a sixth flange, the fifth flange and the sixth flange are arranged on the side of the support plate close to the rotor salient pole, and the fifth flange and the sixth flange are arranged on opposite sides of the support plate in the radial direction of the rotor, and the support plate, the fifth flange, the sixth flange, and the rotor salient pole form the installation space.

[0030] In this structure, the fifth flange and the sixth flange can limit the displacement of the permanent magnet in the radial direction of the rotor, and the support plate can press the permanent magnet against the rotor salient pole, so as to ensure the relative position of the permanent magnet and the rotor, and the structure of the bracket is simple and convenient to manufacture, which can further reduce the structural complexity of the hybrid excitation motor and save manufacturing costs.

[0031] In a possible design, the support is provided with a third slot on a side away from the rotor salient pole, and at least part of the field winding is arranged in the third slot.

[0032] In this structure, the third slot can fix the field winding, thereby playing a positioning role for the field winding, facilitating the winding of the field winding on the rotor salient pole, ensuring the relative position of the field winding and the rotor, and facilitating the field winding to press the support and the permanent magnet against the rotor salient pole, thereby playing a role of fixing the permanent magnet and the support, and further improving the structural stability of the rotor assembly.

[0033] In a possible design, the support further includes a seventh flange and an eighth flange, the fifth flange and the sixth flange are arranged on a side of the support plate away from the rotor salient pole, the seventh flange and the eighth flange are arranged on opposite sides of the support plate in the radial direction of the rotor, and the support plate, the seventh flange, and the eighth flange form the third slot.

[0034] In this structure, the seventh flange and the eighth flange can limit the displacement of the field winding in the radial direction of the rotor, thereby ensuring the relative position of the field winding and the rotor, improving the positioning effect of the field winding, and the structure of the support is simple, facilitating the preparation and formation of the support, thereby further reducing the structural complexity of the hybrid excitation motor and saving the preparation cost.

[0035] In a possible design, the material of the support is epoxy resin or plastic, so as to facilitate the preparation and formation of the support, reduce the preparation cost of the support, and thereby reduce the preparation cost of the hybrid excitation motor.

[0036] In a possible design, the rotor salient pole includes a pole body and a protruding portion, the protruding portion is arranged at an end of the pole body away from the rotor yoke, the protruding portion is protruded on opposite sides of the pole body in the circumferential direction of the rotor, the permanent magnet is arranged on the pole body, and the field winding is wound on the pole body and arranged on the outer side of the permanent magnet.

[0037] The rotor salient pole in this structure can provide sufficient installation space for the permanent magnet and the field winding, thereby facilitating the preparation and formation of the rotor assembly, the protruding portion can limit the displacement of the permanent magnet and the field winding in the radial direction of the rotor, thereby further improving the fixing effect of the permanent magnet and the field winding on the rotor salient pole and improving the structural stability of the rotor assembly. In addition, the protruding portions protruded on opposite sides of the pole body can also reduce the gap between adjacent two rotor salient poles, thereby reducing the torque fluctuation of the hybrid excitation motor and improving the torque smoothness.

[0038] The second aspect of the embodiments of the present application further provides a hybrid excitation motor, which comprises a stator assembly and the rotor assembly described in any of the above embodiments, and the rotor assembly is rotatably installed in the interior of the stator assembly. Since the rotor assembly has the above technical effects, the hybrid excitation motor comprising the rotor assembly should also have corresponding technical effects, which are not described here again.

[0039] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0041] Figure 1 A structural schematic diagram of a hybrid excitation motor provided by the embodiments of the present application;

[0042] Figure 2 A working condition schematic diagram of a hybrid excitation motor provided by the present application;

[0043] Figure 3 A comparison diagram of external characteristic curves of a hybrid excitation motor provided by the embodiments of the present application and a permanent magnet synchronous motor in the related art;

[0044] Figure 4 A comparison diagram of motor no-load back electromotive force curves of a hybrid excitation motor provided by the embodiments of the present application and a permanent magnet synchronous motor in the related art;

[0045] Figure 5 A structural schematic diagram of a rotor assembly provided by the present application in a specific embodiment;

[0046] Figure 6 A structural schematic diagram of a rotor assembly provided by the present application in a specific embodiment; Figure 5 A schematic diagram of part of the structure of the rotor assembly in another specific embodiment;

[0047] Figure 7 A schematic diagram of part of the structure of the rotor assembly in another specific embodiment; Figure 5 A schematic diagram of part of the structure of the rotor assembly in another specific embodiment;

[0048] Figure 8 A structural schematic diagram of a rotor assembly provided by the present application in another specific embodiment;

[0049] Figure 9 A structural schematic diagram of a rotor assembly provided by the present application in another specific embodiment;

[0050] Figure 10 Structure diagram of a rotor assembly according to the present application in another embodiment;

[0051] Figure 11 Structure diagram of a bracket according to the present application in one embodiment;

[0052] Figure 12 Structure diagram of a bracket according to the present application in another embodiment;

[0053] Figure 13 Structure diagram of a bracket according to the present application in another embodiment;

[0054] Figure 14 Structure diagram of a rotor assembly according to the present application in another embodiment;

[0055] Figure 15 Structure diagram of a bracket according to the present application in another embodiment;

[0056] Figure 16 Structure diagram of a rotor assembly according to the present application in another embodiment;

[0057] Figure 17 Structure diagram of a rotor assembly according to the present application in another embodiment.

[0058] Reference numerals:

[0059] 10 - Rotor assembly

[0060] 1 - Rotor

[0061] 11 - Rotor yoke; 12 - Rotor salient pole; 121 - Pole body; 122 - Projection

[0062] 2 - Field winding; 21 - Third magnetic pole; 22 - Fourth magnetic pole

[0063] 3 - Permanent magnet; 31 - First magnetic pole; 32 - Second magnetic pole

[0064] 4 - Bracket; 4a - First slot; 4b - Second slot; 4c - Third slot; 41 - First flange; 42 - Second flange; 43 - Third flange; 44 - Fourth flange; 45 - Fifth flange; 46 - Sixth flange; 47 - Seventh flange; 48 - Eighth flange; 49 - Support plate

[0065] 5 - Installation space

[0066] 20 - Stator assembly

[0067] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, further serve to explain the principles of the application. DETAILED DESCRIPTION

[0068] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below with reference to the drawings.

[0069] In the description of the present application, unless explicitly defined and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0071] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0072] Permanent magnet synchronous motor is a widely used motor type, with high efficiency, good dynamic response performance, low noise and other advantages, widely used in new energy vehicles and other fields. The working principle of permanent magnet synchronous motor is based on the interaction between the rotating magnetic field generated by the stator and the magnetic field generated by the permanent magnet on the rotor. The rotor is installed with pre-magnetized permanent magnets, which can generate strong magnetic field when rotating, thereby providing greater output torque. Because the cost of permanent magnet is high, and at high speed, the armature current vector control of the stator is needed for field weakening, thereby causing the performance attenuation of the motor power, torque and the like, and the hybrid excitation motor as a solution considering high efficiency and low cost, has begun to attract attention.

[0073] The hybrid excitation motor is generally composed of a stator, a rotor, an excitation winding and permanent magnets, and is a motor combining the two excitation sources of the field excitation winding and the permanent magnets. The hybrid excitation motor generates a main magnetic field of the motor by the two excitation sources, realizes the adjustment and control of the main magnetic field of the motor, and achieves the effects of magnetic enhancement and field weakening. The hybrid excitation motor can have various implementation manners in structure. However, the existing hybrid excitation motor has a relatively complex structure, a large process difficulty and a high cost.

[0074] Therefore, the embodiments of the present application provide a rotor assembly and a hybrid excitation motor to simplify the structure of the hybrid excitation motor and reduce the manufacturing cost of the hybrid excitation motor. The hybrid excitation motor can be widely applied to various scenes, for example, can be applied to vehicles, helicopters, airplanes, ships and other transportation tools, and can be applied to robots, medical devices, electric tools and other terminal devices. The application of the hybrid excitation motor is not specially limited, and the following description is based on the application of the hybrid excitation motor in a vehicle. The hybrid excitation motor of the present application is described in detail in the embodiments.

[0075] Please refer to Figure 1 , Figure 1 for a structural schematic diagram of the hybrid excitation motor provided by the embodiments of the present application.

[0076] As shown in Figure 1 , the hybrid excitation motor 100 includes a stator assembly 20 and a rotor assembly 10. The rotor assembly 10 is rotatably installed in the interior of the stator assembly 20 and is used to cooperate with the stator assembly 20 to operate. The stator assembly 20 can include a stator and an armature winding (not shown in the figure). The armature winding can generate a rotating magnetic field after being electrified. The rotor assembly 10 includes a rotor 1, an excitation winding 2 and permanent magnets 3. The permanent magnets 3 are used to provide a constant permanent magnetic field. The excitation winding 2 can generate an excitation magnetic field after being electrified with an excitation current. The permanent magnetic field and the excitation magnetic field jointly form a total magnetic field of the rotor assembly 10. When the hybrid excitation motor 100 operates, the rotating magnetic field generated by the stator winding 20 interacts with the total magnetic field of the rotor assembly 10, so as to realize the rotation of the hybrid excitation motor 100.

[0077] In some embodiments, the magnetic field strength of the excitation magnetic field can be adjusted according to the requirements by controlling the size and direction of the excitation current, so as to enhance or weaken the permanent magnetic field, and realize the regulation and control of the total magnetic field strength of the rotor assembly 10. Specifically, when the working condition is high speed or the motor characteristics need to be changed, the magnetic field strength of the permanent magnetic field can be increased or weakened by adjusting the excitation current, so as to realize the regulation and control of the total magnetic field strength of the rotor assembly 10, and meet the use requirements under different working conditions.

[0078] Specifically, please refer to Figure 2 , Figure 2This is a schematic diagram of the operating conditions of a hybrid excitation motor provided in this application. Figure 2 The horizontal axis represents the rotational speed of the hybrid excitation motor, and the vertical axis represents the torque of the hybrid excitation motor. ω0 is the base speed of the hybrid excitation motor, which refers to the speed at which the motor operates under rated voltage and no-load conditions. The hybrid excitation motor can operate in five working conditions. For ease of explanation, the five working conditions in this application are defined as: Working Condition A1, Working Condition A2, Working Condition A3, Working Condition A4, and Working Condition A5.

[0079] For example, such as Figure 2 As shown, in the first operating condition A1, the hybrid excitation motor operates in the low torque region below the base speed ω0. At this time, the excitation winding 2 is not energized, and the magnetic field of the rotor assembly 10 is provided only by the permanent magnet 3, which can achieve high-efficiency operation.

[0080] For example, such as Figure 2 As shown, in the second operating condition A2 and the third operating condition A3, the hybrid excitation motor operates in the high torque region below the base speed ω0. At this time, the output torque demand of the hybrid excitation motor increases. This can be addressed by supplying a positive excitation current to the excitation winding 2, generating an excitation magnetic field with the same direction as the magnetic field of the permanent magnet 3. This allows the excitation magnetic field and the permanent magnet magnetic field to work together, enhancing the magnetization effect and increasing the total magnetic field strength of the rotor assembly 10. This, in turn, increases the motor's output torque and improves the hybrid excitation motor's performance under low-speed conditions. Furthermore, the magnetic field strength of the excitation magnetic field can be controlled by controlling the magnitude of the excitation current, thereby achieving torque control of the hybrid excitation motor. This allows the hybrid excitation motor to operate efficiently and precisely in the second operating condition A2 or the third operating condition A3.

[0081] For example, such as Figure 2As shown, in the fourth operating condition A4 and the fifth operating condition A5, the hybrid excitation motor works in the small torque area above the motor base speed ω0. Among them, when the rotor assembly rotates at a high angular velocity, its magnetic field interacts with the magnetic field generated by the stator assembly, resulting in the generation of back electromotive force. When the motor speed reaches the base speed ω0 or above, the motor back electromotive force increases significantly, and if no field weakening control is performed, the motor will be forced into a generating state, which not only cannot output positive torque, but also will pose a potential threat to the motor and the whole vehicle system. When the hybrid excitation motor is in the fourth operating condition A4 and the fifth operating condition A5, a reverse excitation current can be passed to the excitation winding 2 to generate an excitation magnetic field opposite to the direction of the magnetic field of the permanent magnet 3, so that the excitation magnetic field can offset part of the permanent magnet magnetic field, play a role in field weakening, and reduce the total magnetic field strength of the rotor assembly 10, thereby reducing the back electromotive force of the hybrid excitation motor in the high speed area, enabling it to output maximum torque at a higher speed, and improving the operating performance of the hybrid excitation motor under high speed conditions. Among them, the magnetic field strength of the excitation magnetic field can be controlled by controlling the size of the excitation current, thereby realizing the speed control of the hybrid excitation motor, so that the hybrid excitation motor can work in the fourth operating condition A4 or the fifth operating condition A5 with high efficiency, high precision.

[0082] Please refer to Figure 3 and Figure 4 , Figure 3 is a comparison chart of the external characteristic curves of a hybrid excitation motor and a permanent magnet synchronous motor in the related art provided by an embodiment of the present application. Figure 4 is a comparison chart of the motor no-load back electromotive force curves of a hybrid excitation motor and a permanent magnet synchronous motor in the related art.

[0083] Figure 3 In the figure, the horizontal coordinate is the motor speed, the unit is rpm, and the vertical coordinate is the motor torque, the unit is Nm, wherein ω0 is the base speed of the hybrid excitation motor, and ω1 is the base speed of the permanent magnet synchronous motor. As shown in Figure 3 , compared with the permanent magnet synchronous motor which needs to be field weakening by the armature current vector control on the stator, the hybrid excitation motor can realize active field weakening by controlling the size and direction of the excitation current of the excitation winding 2, without the need for armature current vector control of the stator assembly for field weakening, thereby improving the base speed and maximum speed of the hybrid excitation motor, and at the same time, improving the output torque above the base speed ω0, i.e. in the high speed area, and improving the operating performance of the hybrid excitation motor under high speed conditions.

[0084] Figure 4 In the figure, the horizontal coordinate is the motor rotor electric angle, and the vertical coordinate is the motor back electromotive force. As shown in Figure 4 , the hybrid excitation motor can change the back electromotive force of the hybrid excitation motor by controlling the size and direction of the excitation current of the excitation winding 2 to realize the effect of field enhancement or field weakening, so as to realize high torque, high efficiency and high precision control.

[0085] Meanwhile, the hybrid excitation motor can realize more flexible control mode due to the combination of permanent magnet and excitation winding.

[0086] Wherein, according to the rated power and / or torque demand of the hybrid excitation motor, and the peak power and / or torque demand, the size of the excitation magnetic field of the excitation winding 2 and the permanent magnetic field of the permanent magnet 3 can be determined by the following formula, so as to determine the number of turns of the excitation winding 2 and the size of the permanent magnet 3.

[0087] T=p[Ψi q +(L d -L q )i d i q ]

[0088] Ψ=Ψ m +Ψ e ,Ψ∈[Ψ m -Ψ e ,Ψ m +Ψ e ]

[0089]

[0090] In the formula, T is the torque of the hybrid excitation motor, p is the pole pair number of the hybrid excitation motor, i d is the d-axis (direct-axis) current, L d is the d-axis inductance, i q is the q-axis (quadrature-axis) current, L q is the q-axis inductance, Ψ m is the permanent magnetic flux linkage of the permanent magnet, Ψ e is the electric excitation magnetic linkage of the excitation winding, and ω0 is the base speed of the hybrid excitation motor.

[0091] Please refer to Figure 5 , Figure 5 for the structure schematic diagram of the rotor assembly in a specific embodiment provided by the present application.

[0092] As shown in Figure 5 , the rotor 1 includes a rotor yoke 11 and a rotor salient pole 12 arranged at the outer circumferential portion of the rotor yoke 11. Along the circumferential direction of the rotor 1, a plurality of rotor salient poles 12 are arranged at the rotor yoke 11 at intervals.

[0093] Wherein, the rotor yoke 11 is a rotor core portion of the rotor 1 that provides mechanical support for the rotor salient pole 12, and the rotor salient pole 12 is a salient pole structure that protrudes from the rotor yoke 11 to the direction of the stator assembly, that is, a tooth portion structure of the rotor 1. As Figure 2In the specific embodiment shown, eight rotor salient poles 12 are arranged on the rotor yoke 11 at intervals, and of course, in some other embodiments, the number of rotor salient poles 12 can also be four, six, etc., which can be set according to actual needs, and is not limited herein. In some embodiments, the rotor 1 can be laminated from silicon steel sheets, which can be set according to actual needs, and is not limited herein.

[0094] As shown in Figure 5 , the permanent magnet 3 is arranged on the rotor salient pole 12, and the field winding 2 is arranged on the rotor salient pole 12 and outside the permanent magnet 3.

[0095] In this embodiment, as shown in Figure 5 , by adjusting the size and direction of the current of the field winding 2, the permanent magnet field of the permanent magnet 3 can be enhanced or weakened, the function of field excitation or field weakening can be realized, and thus the total magnetic field intensity of the rotor assembly 10 can be regulated, so as to meet the use requirements of the hybrid excitation motor under different working conditions, and improve the motor efficiency and power performance under high speed. Among them, since the field excitation magnetic field generated after the field winding 2 is passed through the current can realize the function of enhancing the permanent magnet field of the permanent magnet 3, the setting of the field winding 2 can also reduce the amount of the permanent magnet 3, so as to reduce the manufacturing cost of the hybrid excitation motor. When the hybrid excitation motor is running at no load, the total magnetic field intensity of the rotor assembly 10 can be reduced by adjusting the current of the field winding 2, so as to reduce the drag loss, without the need to increase the disengaging device such as the clutch, and the manufacturing cost can be further reduced. In addition, the field winding 2 and the permanent magnet 3 are arranged on each rotor salient pole 12, which can facilitate the field excitation magnetic field generated by the field winding 2 to enhance or weaken the permanent magnet field generated by the permanent magnet 3, reduce the coordination difficulty of the field excitation magnetic field and the permanent magnet field, and thus reduce the output torque fluctuation of the motor. At the same time, the field winding 2 arranged outside the permanent magnet 3 can also play a role in restraining and fixing the permanent magnet 3, improve the structural stability of the rotor assembly 10, and the structure of the rotor assembly 10 is simple, which is convenient for preparation and implementation, can reduce the structural complexity of the hybrid excitation motor, and further reduce the manufacturing cost.

[0096] Please refer to Figure 6 , Figure 6 for Figure 5 the schematic diagram of part of the structure of the rotor assembly in a specific embodiment.

[0097] As shown in Figure 6 , in a specific embodiment, the permanent magnet 3 includes a first magnetic pole 31 and a second magnetic pole 32, and the first magnetic pole 31 and the second magnetic pole 32 are arranged in sequence along the radial direction of the rotor 1, so that the permanent magnet 3 forms a permanent magnet field along the radial direction of the rotor 1, and the total magnetic field along the radial direction of the rotor 1 is formed on the rotor salient pole 12, thereby facilitating the cooperation of the rotor assembly 10 and the stator assembly, and reducing the structural complexity of the hybrid excitation motor.

[0098] As shown in Figure 6 , in one embodiment, the magnetic pole directions of the permanent magnets 3 on the same rotor salient pole 12 are the same, and the magnetic pole directions of the permanent magnets 3 on the adjacent two rotor salient poles 12 are opposite, so that the hybrid excitation motor can effectively utilize the magnetic field during operation, thereby improving the efficiency of the hybrid excitation motor.

[0099] In one embodiment, as shown in Figure 6 , after the excitation winding 2 passes through the excitation current, the third magnetic pole 21 and the fourth magnetic pole 22 are generated, which are arranged in sequence along the radial direction of the rotor 1, so that the excitation winding 2 forms an excitation magnetic field along the radial direction of the rotor 1 after passing through the excitation current, further facilitating the excitation magnetic field generated by the excitation winding 2 to strengthen or weaken the permanent magnet magnetic field generated by the permanent magnet 3, and reducing the difficulty of cooperation between the excitation magnetic field and the permanent magnet magnetic field.

[0100] Exemplarily, as shown in the embodiment shown in Figure 6 , when the excitation winding 2 passes through the positive excitation current, the magnetic pole direction formed by the excitation winding 2 on the same rotor salient pole 12 is the same as the magnetic pole direction of the permanent magnet 3, at this time the excitation magnetic field and the permanent magnet magnetic field act together to have a magnetism-enhancing effect, which can improve the total magnetic field strength of the rotor assembly 10.

[0101] Exemplarily, please refer to Figure 7 , Figure 7 , Figure 5 for the schematic diagram of part of the structure of the rotor assembly in another embodiment. As shown in Figure 7 , when the excitation winding 2 passes through the reverse excitation current, the magnetic pole direction formed by the excitation winding 2 on the same rotor salient pole 12 is opposite to the magnetic pole direction of the permanent magnet 3, at this time the excitation magnetic field can offset part of the permanent magnet magnetic field, which has a magnetic weakening effect and can weaken the total magnetic field strength of the rotor assembly 10.

[0102] In one embodiment, as shown in Figure 5 to 7 , along the circumferential direction of the rotor 1, the permanent magnet 3 is arranged on the opposite sides of the rotor salient pole 12, thereby reducing the difficulty of arranging the permanent magnet 3 on the rotor salient pole 12, facilitating the preparation and formation of the rotor assembly 10, and reducing the structural complexity of the hybrid excitation motor.

[0103] Among them, the permanent magnet 3 can be surface-mounted on the surface of the rotor salient pole 12, so as to further reduce the difficulty of preparing the rotor assembly 10, further reduce the structural complexity of the hybrid excitation motor, and save the preparation cost.

[0104] Please refer to Figure 8 , Figure 8Structure diagram of the rotor assembly provided by the present application in another specific embodiment.

[0105] In another specific embodiment, as shown in Figure 8 , the permanent magnets 3 can also be embedded inside the rotor salient poles 12 to improve the structural stability of the rotor assembly 10 and the design freedom of the rotor assembly 10.

[0106] Please refer to Figure 9 , Figure 9 Structure diagram of the rotor assembly provided by the present application in another specific embodiment.

[0107] In another specific embodiment, as shown in Figure 9 , part of the permanent magnets 3 can be surface-mounted on the opposite sides of the rotor salient poles 12, and the other part of the permanent magnets 3 can be embedded inside the rotor salient poles 12 to further improve the design freedom of the rotor assembly 10.

[0108] Of course, the permanent magnets 3 can also be arranged in other ways in the rotor salient poles 12, which can be arranged according to actual needs, and are not limited herein.

[0109] Please refer to Figure 10 , Figure 10 Structure diagram of the rotor assembly provided by the present application in another specific embodiment, in which the field winding is removed.

[0110] As shown in Figure 10 , the rotor assembly 10 can also include a bracket 4, which is installed on the rotor salient poles 12, and the permanent magnets 3 are installed on the bracket 4.

[0111] In this embodiment, as shown in Figure 10 , the bracket 4 can be used to fix the permanent magnets 3 to improve the connection stability of the permanent magnets 3 on the rotor salient poles 12, and the bracket 4 can also position the relative position of the permanent magnets 3 and the rotor 1 to further improve the structural stability of the rotor assembly 10.

[0112] In the assembly process of the rotor assembly 10, the permanent magnets 3 can be first installed in the bracket 4, then the bracket 4 with the permanent magnets 3 is installed on the rotor salient poles 12, and finally the field winding 2 is wound, which is a simple and feasible process scheme and saves the preparation cost of the hybrid excitation motor.

[0113] Please refer to Figure 11 , Figure 11 Structure diagram of the bracket provided by the present application in one specific embodiment.

[0114] In one specific embodiment, as shown in Figure 11As shown in the figure, the bracket 4 is provided with a first slot 4a on the side away from the rotor salient pole 12, and the permanent magnet 3 is installed in the first slot 4a.

[0115] In this embodiment, the structure can facilitate the installation and connection of the bracket 4 on the side close to the rotor salient pole 12, and the first slot 4a facilitates the installation and fixation of the permanent magnet 3, which can ensure the relative position of the permanent magnet 3 and the rotor 1 and further improve the structural stability of the rotor assembly 10.

[0116] Further, as shown in the figure, Figure 11 the bracket 4 includes a support plate 49, a first flange 41 and a second flange 42, the first flange 41 and the second flange 42 are arranged on the side of the support plate 49 away from the rotor salient pole 12, and along the radial direction of the rotor 1, the first flange 41 and the second flange 42 are arranged on the opposite sides of the support plate 49, and the support plate 49, the first flange 41 and the second flange 42 form the first slot 4a.

[0117] In this embodiment, the first flange 41 and the second flange 42 can limit the displacement of the permanent magnet 3 along the radial direction of the rotor 1, thereby ensuring the relative position of the permanent magnet 3 and the rotor 1, improving the fixation effect of the permanent magnet 3, and the structure of the bracket 4 is simple and easy to manufacture, which can further reduce the structural complexity of the hybrid excitation motor and save the preparation cost.

[0118] Further, please refer to Figure 12 , Figure 12 the structure schematic diagram of the bracket provided in the present application in another specific embodiment. As shown in the figure, Figure 12 the bracket 4 on the side close to the rotor salient pole 12 can also be provided with a second slot 4b, and at least part of the rotor salient pole 12 is arranged in the second slot 4b.

[0119] In this embodiment, the bracket 4 can be clamped on the rotor salient pole 12 through the second slot 4b, which facilitates the connection of the bracket 4 and the rotor salient pole 12 and improves the connection reliability of the bracket 4 and the rotor salient pole 12.

[0120] Further, as shown in the figure, Figure 12 the bracket 4 further includes a third flange 43 and a fourth flange 44, the third flange 43 and the fourth flange 44 are arranged on the side of the support plate 49 close to the rotor salient pole 12, and along the axial direction of the rotor 1, the third flange 43 and the fourth flange 44 are arranged on the opposite sides of the support plate 49, and the support plate 49 and the third flange 43 and the fourth flange 44 form the second slot 4b.

[0121] In this embodiment, the third flange 43 and the fourth flange 44 can be located on opposite sides of the rotor salient pole 12 along the axial direction of the rotor 1, so that the bracket 4 can be stably attached to the rotor salient pole 12. Moreover, the bracket 4 has a simple structure and is easy to manufacture, which can further reduce the structural complexity of the hybrid excitation motor and save manufacturing costs.

[0122] Further, please refer to Figure 13 , Figure 13 This is a schematic diagram of the structure of the support provided in this application in another specific embodiment. For example... Figure 13 As shown, at least a portion of the third flange 43 and the fourth flange 44 extend in a direction away from the rotor salient pole 12 and are connected to the first flange 41 and the second flange 42.

[0123] In this embodiment, the first flange 41 and the second flange 42 can also restrict the displacement of the permanent magnet 3 along the axial direction of the rotor 1, thereby further improving the fixing effect of the bracket 4 on the permanent magnet 3, ensuring the relative position of the permanent magnet 3 and the rotor 1, and improving the structural stability of the rotor assembly 10.

[0124] Please refer to Figure 14 , Figure 14 This is a schematic diagram of the rotor assembly provided in this application in another specific embodiment. (See diagram below.) Figure 14 As shown, in another specific embodiment, the bracket 4 can be arranged to form an installation space 5 between the side near the rotor salient pole 12 and the rotor salient pole 12, and the permanent magnet 3 can be disposed in the installation space 5.

[0125] In this embodiment, the permanent magnet 3 is disposed in the mounting space 5 between the bracket 4 and the rotor salient pole 12, which can improve the fixing effect of the permanent magnet 3 and further improve the structural stability of the rotor assembly 10.

[0126] Further, please refer to Figure 15 , Figure 15 This is a schematic diagram of the structure of the support provided in this application in another specific embodiment. For example... Figure 15 As shown, the bracket 4 includes a support plate 49, a fifth flange 45 and a sixth flange 46. The fifth flange 45 and the sixth flange 46 are disposed on the side of the support plate 49 near the rotor salient pole 12. Along the radial direction of the rotor 1, the fifth flange 45 and the sixth flange 46 are disposed on opposite sides of the support plate 49. The support plate 49, the fifth flange 45, the sixth flange 46 and the rotor salient pole 12 form an installation space 5.

[0127] In the embodiment, the fifth flange 45 and the sixth flange 46 can limit the displacement of the permanent magnet 3 in the radial direction of the rotor 1, and the support plate 49 can press the permanent magnet 3 against the rotor salient pole 12, so as to ensure the relative position of the permanent magnet 3 and the rotor 1, and the structure of the support 4 is simple, which is convenient for preparation and formation, and can further reduce the structural complexity of the hybrid excitation motor and save the preparation cost.

[0128] Further, as shown in Figure 14 , the side of the support 4 away from the rotor salient pole 12 can be provided with a third slot 4c, and at least part of the excitation winding 2 is arranged in the third slot 4c.

[0129] In the embodiment, the third slot 4c can fix the excitation winding 2, so as to play a positioning role on the excitation winding 2, facilitate the winding of the excitation winding 2 on the rotor salient pole 12, ensure the relative position of the excitation winding 2 and the rotor 1, and also facilitate the excitation winding 2 to press the support 4 and the permanent magnet 3 against the rotor salient pole 12, play a role of fixing the permanent magnet 3 and the support 4, and further improve the structural stability of the rotor assembly 10.

[0130] Further, as shown in Figure 15 , the support 4 further includes a seventh flange 47 and an eighth flange 48, the fifth flange 45 and the sixth flange 46 are arranged on the side of the support plate 49 away from the rotor salient pole 12, and the seventh flange 47 and the eighth flange 48 are arranged on the opposite sides of the support plate 49 in the radial direction of the rotor 1, and the support plate 49, the seventh flange 47 and the eighth flange 48 form the third slot 4c.

[0131] In the embodiment, the seventh flange 47 and the eighth flange 48 can limit the displacement of the excitation winding 2 in the radial direction of the rotor 1, so as to ensure the relative position of the excitation winding 2 and the rotor 1, improve the positioning effect of the excitation winding 2, and the structure of the support 4 is simple, which is convenient for preparation and formation, and can further reduce the structural complexity of the hybrid excitation motor and save the preparation cost.

[0132] Of course, the support 4 can also have other structures, as long as the permanent magnet 3 can be fixed on the rotor salient pole 12, and the specific setting can be made according to the actual needs, which is not limited here.

[0133] In a specific embodiment, the material of the support 4 is epoxy resin or plastic, so as to facilitate the preparation and formation of the support 4, reduce the preparation cost of the support 4, and thus reduce the preparation cost of the hybrid excitation motor.

[0134] Specifically, the support 4 can be an integrally formed structure, so as to further reduce the preparation difficulty, facilitate mass production of the support 4, and further reduce the preparation cost of the hybrid excitation motor.

[0135] Please refer to Figure 16 ,Figure 16 Structure diagram of the rotor assembly provided by the application in another specific embodiment.

[0136] As shown in the drawings, Figure 16 In one specific embodiment, the rotor salient pole 12 includes a pole body 121 and a protruding part 122, the protruding part 122 is arranged at one end of the pole body 121 away from the rotor yoke 11, along the circumference of the rotor 1, the protruding part 122 is protruded on the opposite sides of the pole body 121, the permanent magnet 3 is arranged on the pole body 121, and the field winding 2 is arranged on the pole body 121 and outside the permanent magnet 3.

[0137] Among them, the magnetic field of the rotor 1 circumference is a sine magnetic field, but the gap between the adjacent two rotor salient poles 12 is too large to easily affect the formation of the magnetic field of the rotor 1 circumference, thereby easily producing torque fluctuation.

[0138] In this embodiment, as shown in the drawings, Figure 16 The rotor salient pole 12 of this structure can provide sufficient installation space for the permanent magnet 3 and the field winding 2, thereby facilitating the preparation and formation of the rotor assembly 10, and the protruding part 122 can limit the displacement of the permanent magnet 3 and the field winding 2 along the radial direction of the rotor 1, thereby further improving the fixing effect of the permanent magnet 3 and the field winding 2 on the rotor salient pole 12 and improving the structural stability of the rotor assembly 10. In addition, the protruding part 122 protruded on the opposite sides of the pole body 121 can also reduce the gap between the adjacent two rotor salient poles 12, thereby reducing the torque fluctuation of the hybrid excitation motor and improving the torque smoothness.

[0139] Please refer to Figure 17 , Figure 17 Structure diagram of the rotor assembly provided by the application in another specific embodiment. As shown in the drawings, Figure 17 In another specific embodiment, along the circumference of the rotor 1, the opposite side surfaces of the rotor salient pole 12 can also be a plane structure, so as to reduce the preparation difficulty of the rotor 1, facilitate the preparation and formation of the rotor 1, thereby further reducing the structural complexity of the hybrid excitation motor and saving the preparation cost.

[0140] Of course, the rotor salient pole 12 of the rotor 1 can also be other structures, which can be set according to actual needs, and is not limited here.

[0141] The same and similar parts among the various embodiments in the specification can be referred to each other. Especially, for the device embodiments and the terminal embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the related parts can be referred to the description in the method embodiments.

[0142] The above merely describes the specific implementation of the embodiments of the present application, but the protection scope of the embodiments of the present application is not limited thereto, any change or replacement within the technical scope disclosed by the embodiments of the present application should be covered in the protection scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application should be subject to the protection scope of the claims.

Claims

1. A rotor assembly, characterized in that, include: The rotor (1) includes a rotor yoke (11) and a plurality of rotor salient poles (12); the plurality of rotor salient poles (12) are spaced apart on the rotor yoke (11) along the circumferential direction of the rotor (1); A permanent magnet (3) is disposed on the rotor salient pole (12); Excitation winding (2) is wound around the rotor salient pole (12) and disposed outside the permanent magnet (3).

2. The rotor assembly according to claim 1, characterized in that, Along the circumference of the rotor (1), the permanent magnet (3) is disposed on opposite sides of the rotor salient pole (12).

3. The rotor assembly according to claim 1 or 2, characterized in that, The permanent magnet (3) includes a first magnetic pole (31) and a second magnetic pole (32), which are arranged sequentially along the radial direction of the rotor (1).

4. The rotor assembly according to any one of claims 1 to 3, characterized in that, The excitation winding (2) is used to generate a third magnetic pole (21) and a fourth magnetic pole (22), which are arranged sequentially along the radial direction of the rotor (1).

5. The rotor assembly according to claim 3, characterized in that, The permanent magnets (3) located on the same rotor salient pole (12) have the same magnetic pole direction; The permanent magnets (3) on two adjacent rotor salient poles (12) have opposite magnetic pole directions.

6. The rotor assembly according to claim 1, characterized in that, The permanent magnet (3) is attached to the surface of the rotor salient pole (12); And / or, the permanent magnet (3) is embedded inside the rotor salient pole (12).

7. The rotor assembly according to any one of claims 1 to 6, characterized in that, The rotor assembly (10) further includes a bracket (4) mounted on the rotor salient pole (12), and the permanent magnet (3) mounted on the bracket (4).

8. The rotor assembly according to claim 7, characterized in that, The bracket (4) has a first groove (4a) on the side away from the rotor salient pole (12), and the permanent magnet (3) is installed in the first groove (4a).

9. The rotor assembly according to claim 8, characterized in that, The bracket (4) includes a support plate (49), a first flange (41) and a second flange (42), wherein the first flange (41) and the second flange (42) are disposed on the side of the support plate (49) away from the rotor salient pole (12); along the radial direction of the rotor (1), the first flange (41) and the second flange (42) are disposed on opposite sides of the support plate (49); The support plate (49), the first flange (41) and the second flange (42) form the first groove (4a).

10. The rotor assembly according to claim 9, characterized in that, The bracket (4) has a second groove (4b) on the side near the rotor salient pole (12), and at least a portion of the rotor salient pole (12) is disposed in the second groove (4b).

11. The rotor assembly according to claim 10, characterized in that, The bracket (4) further includes a third flange (43) and a fourth flange (44), the third flange (43) and the fourth flange (44) being disposed on the side of the support plate (49) near the rotor salient pole (12); along the axial direction of the rotor (1), the third flange (43) and the fourth flange (44) are disposed on opposite sides of the support plate (49); The support plate (49) forms a second groove (4b) with the third flange (43) and the fourth flange (44).

12. The rotor assembly according to claim 11, characterized in that, At least a portion of the third flange (43) and the fourth flange (44) extend in a direction away from the rotor salient pole (12) and are connected to the first flange (41) and the second flange (42).

13. The rotor assembly according to claim 7, characterized in that, The bracket (4) is arranged to form an installation space (5) between the side of the bracket (4) near the rotor salient pole (12) and the rotor salient pole (12), and the permanent magnet (3) is disposed in the installation space (5).

14. The rotor assembly according to claim 13, characterized in that, The bracket (4) includes a support plate (49), a fifth flange (45) and a sixth flange (46), the fifth flange (45) and the sixth flange (46) being disposed on the side of the support plate (49) near the rotor salient pole (12); along the radial direction of the rotor (1), the fifth flange (45) and the sixth flange (46) are disposed on opposite sides of the support plate (49); The mounting space (5) is formed by the support plate (49), the fifth flange (45), the sixth flange (46), and the rotor salient pole (12).

15. The rotor assembly according to claim 14, characterized in that, The bracket (4) has a third slot (4c) on the side away from the rotor salient pole (12), and at least a portion of the excitation winding (2) is disposed in the third slot (4c).

16. The rotor assembly according to claim 15, characterized in that, The bracket (4) further includes a seventh flange (47) and an eighth flange (48), the fifth flange (45) and the sixth flange (46) are disposed on the side of the support plate (49) away from the rotor salient pole (12); along the radial direction of the rotor (1), the seventh flange (47) and the eighth flange (48) are disposed on opposite sides of the support plate (49); The support plate (49), the seventh flange (47), and the eighth flange (48) form the third groove (4c).

17. The rotor assembly according to any one of claims 7 to 16, characterized in that, The bracket (4) is made of epoxy resin or plastic.

18. The rotor assembly according to any one of claims 1 to 17, characterized in that, The rotor salient pole (12) includes a pole body (121) and a protrusion (122). The protrusion (122) is disposed at one end of the pole body (121) away from the rotor yoke (11). Along the circumference of the rotor (1), the protrusion (122) protrudes from opposite sides of the pole body (121). The permanent magnet (3) is disposed on the pole body (121); The excitation winding (2) is wound around the pole body (121) and located on the outside of the permanent magnet (3).

19. A hybrid excitation motor, characterized in that, The hybrid excitation motor includes a stator assembly (20) and a rotor assembly (10) as described in any one of claims 1 to 18, wherein the rotor assembly (10) is rotatably mounted inside the stator assembly (20).

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