Hybrid pole type double rotor axial field motor

Abstract

The application discloses a hybrid magnetic pole type double-rotor axial magnetic field motor and relates to the technical field of permanent magnet motors. The hybrid magnetic pole type double-rotor axial magnetic field motor comprises a hybrid magnetic pole permanent magnet rotor, the side surface of the hybrid magnetic pole permanent magnet rotor is provided with a yokeless segmented stator iron core, the yokeless segmented stator iron core is provided with an armature winding, the hybrid magnetic pole permanent magnet rotor comprises a first permanent magnet, the side wall of the first permanent magnet is provided with a rotor iron core, the inside of the rotor iron core is provided with a second permanent magnet, the first permanent magnet is axially magnetized, the second permanent magnet is tangentially magnetized, the first permanent magnet and the second permanent magnet are alternately distributed along the axial direction, one end of the second permanent magnet is provided with alternately distributed air magnetic barriers, and the air magnetic barriers are used for reducing permanent magnet leakage. The hybrid magnetic pole type axial magnetic field motor can effectively and fully utilize the internal space of the axial magnetic field and improve the torque density and power density of the axial magnetic field motor.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of permanent magnet motors, in particular to a hybrid magnetic pole type double-rotor axial magnetic field motor. BACKGROUND

[0002] Permanent magnet synchronous motors (PMSM) have the advantages of high power density, high torque density, high efficiency and strong overload capacity, and are widely used in the field of new energy vehicles. According to the direction of the main magnetic flux of the motor, permanent magnet motors are divided into axial magnetic field motors and radial magnetic field motors. The axial magnetic field motor has the advantages of short axial length, small volume, high efficiency, high torque and power density, and is very suitable for application in compact vehicle space, especially for direct drive occasions, and has become a research hotspot for new energy vehicle motors.

[0003] At present, the axial magnetic field motor mostly adopts single-stator single-rotor, single-stator double-rotor and single-rotor double-stator structures, wherein the single-stator double-rotor YASA (Yokeless and segmented armature) axial magnetic field motor has an outer rotor structure, and has high rotational inertia and high power density, and has been successfully applied to electric vehicles. However, the YASA axial magnetic field motor often has high electrical load, and the stator is arranged between the two rotor discs, and the heat dissipation performance is poor under natural cooling, how to fully utilize the internal space of the YASA motor and further improve the magnetic load has become a technical difficulty, therefore, the application provides a hybrid magnetic pole type double-rotor axial magnetic field motor. SUMMARY

[0004] The application aims to provide a hybrid magnetic pole type double-rotor axial magnetic field motor which can fully utilize the internal space of the axial magnetic field and improve the torque density and power density of the axial magnetic field motor.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a hybrid magnetic pole type double-rotor axial magnetic field motor, comprising a hybrid magnetic pole permanent magnet rotor, the hybrid magnetic pole permanent magnet rotor is provided with a yokeless segmented stator core on the side surface, the yokeless segmented stator core is provided with an armature winding, the hybrid magnetic pole permanent magnet rotor comprises a first permanent magnet, a rotor core is arranged on the side wall of the first permanent magnet, a second permanent magnet is arranged in the interior of the rotor core, the first permanent magnet is axially magnetized, the second permanent magnet is tangentially magnetized, the first permanent magnet and the second permanent magnet are alternately distributed along the axial direction, and one end of the second permanent magnet is provided with alternately distributed air magnetic barriers for reducing the magnetic flux leakage of the permanent magnet.

[0006] Further, the second permanent magnet is in the form of a spoke and is embedded in the rotor core.

[0007] Furthermore, the yokeless segmented stator core is axially magnetic, and the cross-section of the yokeless segmented stator core is I-shaped.

[0008] Furthermore, the yokeless segmented stator core is made of soft magnetic composite material or is made of silicon steel material that is stacked in the radial direction and then cut.

[0009] Furthermore, the number of the hybrid magnetic pole permanent magnet rotors is two, and the yokeless segmented stator core is arranged between the two hybrid magnetic pole permanent magnet rotors.

[0010] Furthermore, the yokeless segmented stator core is coaxial with the hybrid magnetic pole permanent magnet rotor, and an air gap is provided between the stator core and the rotor hybrid magnetic pole permanent magnet.

[0011] This invention has at least the following beneficial effects:

[0012] 1. This invention adopts an axial magnetic field dual rotor structure, which has advantages such as short axial length, high operating efficiency, high torque and power density;

[0013] 2. The present invention adopts a hybrid magnetic pole design. The rotor is equipped with a surface-mounted axially magnetized first permanent magnet and an embedded tangentially magnetized second permanent magnet. The internal space of the motor is highly utilized and the structure is compact, which further effectively improves the torque and power density of the motor.

[0014] 3. The present invention adopts a segmented stator structure and a fractional slot concentrated winding form, which has a large slot area, a high slot fill factor, a short coil end, low copper loss, and high power density.

[0015] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the hybrid magnetic pole type dual rotor axial magnetic field motor of the present invention;

[0017] Figure 2 This is a front structural schematic diagram of the hybrid magnetic pole type dual rotor axial magnetic field motor of the present invention;

[0018] Figure 3 This is a top view of the hybrid magnetic pole permanent magnet rotor of the present invention;

[0019] Figure 4 This is a schematic diagram of the permanent magnet charging direction of the hybrid magnetic pole type dual rotor axial magnetic field motor of the present invention;

[0020] Figure 5 This paper compares the torque variation with current of the hybrid magnetic pole type dual rotor axial magnetic field motor of the present invention with that of a conventional dual rotor axial magnetic field motor of the same size.

[0021] Figure label:

[0022] 1. Hybrid permanent magnet rotor; 1.1. First permanent magnet; 1.2. Rotor core; 1.3. Second permanent magnet; 1.4. Air magnetic barrier; 2. Yokeless segmented stator core; 3. Armature winding. Detailed Implementation

[0023] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0024] Please see Figures 1-5 The present invention provides a technical solution: a hybrid magnetic pole type dual rotor axial magnetic field motor, including a hybrid magnetic pole permanent magnet rotor 1, a yokeless segmented stator core 2 is provided on the side of the hybrid magnetic pole permanent magnet rotor 1, an armature winding 3 is provided on the yokeless segmented stator core 2, the yokeless segmented stator core 2 is coaxial with the hybrid magnetic pole permanent magnet rotor 1, and an air gap is provided between the yokeless segmented stator core 2 and the rotor hybrid magnetic pole permanent magnet.

[0025] It should be noted that the yokeless segmented stator core 2 is axially magnetic, and the cross-section of the yokeless segmented stator core 2 is I-shaped.

[0026] Furthermore, rectangular stator slots are formed between different yokeless segmented stator cores 2 to house the armature windings 3 wound on the yokeless segmented stator cores 2. The armature windings 3 adopt fractional slot concentrated windings, which have the advantages of high winding coefficient, short winding ends, high slot fill factor, and low copper loss.

[0027] The hybrid permanent magnet rotor 1 includes a first permanent magnet 1.1, a rotor core 1.2 disposed on the side wall of the first permanent magnet 1.1, and a second permanent magnet 1.3 embedded in the rotor core 1.2 in a spoke-like shape inside the rotor core 1.2. The first permanent magnet 1.1 is axially magnetized, and the second permanent magnet 1.3 is tangentially magnetized. The first permanent magnet 1.1 and the second permanent magnet 1.3 are alternately distributed along the axial direction, and the number of pole pairs of the first permanent magnet 1.1 and the second permanent magnet 1.3 are equal.

[0028] Furthermore, there are two hybrid magnetic pole permanent magnet rotors 1, forming an outer rotor structure, and the yokeless segmented stator core 2 is set between the two hybrid magnetic pole permanent magnet rotors 1.

[0029] The second permanent magnet 1.3 has alternating air magnetic barriers 1.4 near its center end, which are used to reduce the leakage of permanent magnet magnetic flux, increase torque density, and facilitate processing.

[0030] The operation principle of the mixed magnetic pole type double-rotor axial magnetic field motor disclosed in the present application is as follows:

[0031] The magnetic circuit of the mixed magnetic pole type double-rotor axial magnetic field motor in the present example is as shown in the figure: Figure 4 The two first permanent magnets 1.1 are axially symmetrical and have the same magnetization direction, and the two second permanent magnets 1.3 are axially symmetrical and have opposite magnetization directions, which can enhance the magnetic load of the motor in limited space, improve the torque and power density, and help to stabilize the load.

[0032] Figure 5 To compare the torque-current change of the mixed magnetic pole type double-rotor axial magnetic field motor of the present application with that of a conventional double-rotor axial magnetic field motor of the same size, the motor structure of the present application has low core saturation degree and high torque-current linearity, and can realize higher torque density compared with the conventional structure.

[0033] It should be noted that, in the present text, relational terms such as first and second and the like are used merely to differentiate one entity or action from another, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Also, the terms "comprises", "comprising", or any other variations thereof are intended to cover non-exclusive inclusions, so that a process, method, article, or apparatus that comprises a list of elements does not only include those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0034] For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. When an element is referred to as "assembled", "mounted", "fixed", or "disposed" to another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right", and similar expressions used herein are for illustrative purposes only and are not the only implementation.

[0035] Although embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements, and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

[0036] In the description of the disclosure, the description of the terms "one embodiment", "an example", "a specific example", and the like, means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the disclosure. In the description of the disclosure, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A hybrid magnetic pole type dual rotor axial magnetic field motor, characterized in that, It includes a hybrid magnetic pole permanent magnet rotor (1), the side of which is provided with a yokeless segmented stator core (2), and the yokeless segmented stator core (2) is provided with an armature winding (3). The hybrid permanent magnet rotor (1) includes a first permanent magnet (1.1), a rotor core (1.2) is provided on the side wall of the first permanent magnet (1.1), and a second permanent magnet (1.3) is provided inside the rotor core (1.2). The first permanent magnet (1.1) is axially magnetized, and the second permanent magnet (1.3) is tangentially magnetized. The first permanent magnet (1.1) and the second permanent magnet (1.3) are alternately distributed along the axial direction. One end of the second permanent magnet (1.3) is provided with alternating air magnetic barriers (1.4) to reduce magnetic leakage of the permanent magnet; The second permanent magnet (1.3) is embedded in the rotor core (1.2) in a spoke-like shape.

2. The hybrid pole type dual rotor axial magnetic field motor according to claim 1, characterized in that: The yokeless segmented stator core (2) is axially magnetic, and the cross-section of the yokeless segmented stator core (2) is "I" shaped.

3. The hybrid pole type dual rotor axial magnetic field motor according to claim 1, characterized in that: The yokeless segmented stator core (2) is made of soft magnetic composite material or is made of silicon steel material stacked in the radial direction and then cut.

4. A hybrid pole type dual rotor axial magnetic field motor according to claim 1, characterized in that: The number of the hybrid magnetic pole permanent magnet rotors (1) is two, and the yokeless segmented stator core (2) is set between the two hybrid magnetic pole permanent magnet rotors (1).

5. A hybrid pole type dual rotor axial magnetic field motor according to claim 1, characterized in that: The yokeless segmented stator core (2) is coaxial with the hybrid magnetic pole permanent magnet rotor (1), and an air gap is provided between the core and the rotor hybrid magnetic pole permanent magnet.

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