Novel auxiliary tooth stator permanent magnet type magnetic flux switching motor

Abstract

The utility model discloses a novel auxiliary tooth stator permanent magnet type magnetic flux switching motor comprising a motor stator comprising a stator iron core, a plurality of main teeth and a plurality of auxiliary teeth are arranged on the inner side of the stator iron core at intervals in a staggered manner in the circumferential direction, the number of the main teeth is the same as that of the auxiliary teeth, and the number of the auxiliary teeth is the same as that of the main teeth; each main tooth is provided with a first set of permanent magnets, the end of each auxiliary tooth is provided with a split tooth, and each split tooth is provided with a second set of permanent magnets. The motor rotor and the motor stator are coaxially arranged, a plurality of rotor teeth are arranged on the outer side of the motor rotor in the circumferential direction at intervals, and the number of the rotor teeth is an odd number. According to the utility model, the torque and the efficiency of the motor are improved, the torque pulsation is reduced, and the motor is suitable for application occasions with higher torque requirements under the same volume.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a novel auxiliary tooth stator permanent magnet type magnetic flux switching motor. BACKGROUND

[0002] Permanent magnet type magnetic flux switching motor simple structure, air gap magnetic field is stronger, can produce bigger torque and power in smaller volume, especially suitable for the occasion that the motor size and weight have strict limitation, electric automobile, low altitude aircraft, robot joint etc. But the shortcoming is that the magnetic field structure and working principle of permanent magnet type magnetic flux switching motor are relatively complex, the control strategy and control system of motor are required higher, and the motor can produce bigger torque ripple in the operation process, torque ripple not only will result in mechanical vibration and noise, but also will influence motor running stability and control precision.

[0003] Figure 1 A kind of traditional E type structure stator permanent magnet type magnetic flux switching motor is shown, it includes motor stator and motor rotor, motor stator is coaxially arranged with motor rotor;Motor stator includes stator core, the inside of stator core is circumferentially staggered and is spaced apart six main teeth and six auxiliary teeth, six main teeth and six auxiliary teeth form twelve embedded wire slots, three-phase coil winding is installed in twelve embedded wire slots using single layer winding method, six main teeth are all provided with permanent magnet;The outside of motor rotor is circumferentially spaced apart fourteen rotor teeth.Although the above-mentioned traditional E type structure stator permanent magnet type magnetic flux switching motor has the advantages of small volume and big torque, but in some high torque demand occasions, its torque still cannot meet the requirements, resulting in that in some heavy load or need high power output applications, the motor can not provide sufficient driving force;At the same time, since the number of salient pole of its motor rotor is even, there is even harmonic, so torque ripple is also relatively large. UTILITY MODEL CONTENTS

[0004] In order to overcome the problems of torque deficiency and large torque ripple of the existing permanent magnet type magnetic flux switching motor, the utility model provides a novel auxiliary tooth stator permanent magnet type magnetic flux switching motor.

[0005] The technical scheme of the utility model is as follows:

[0006] A novel auxiliary tooth stator permanent magnet type magnetic flux switching motor, comprising:

[0007] Motor stator, including stator core, the inside of stator core is circumferentially staggered and is spaced apart a plurality of main teeth and a plurality of auxiliary teeth, the number of main teeth is same with the number of auxiliary teeth, each main tooth is all provided with first set of permanent magnet, and the end of each auxiliary tooth is provided with split tooth, and second set of permanent magnet is arranged on the split tooth;

[0008] The motor rotor is coaxially arranged with the motor stator, and a plurality of rotor teeth are circumferentially arranged on the outer side of the motor rotor, and the number of the rotor teeth is odd.

[0009] According to the novel auxiliary tooth stator permanent magnet type flux switching motor, the first set of permanent magnets are tangentially magnetized permanent magnets.

[0010] According to the novel auxiliary tooth stator permanent magnet type flux switching motor, the second set of permanent magnets are tangentially magnetized permanent magnets.

[0011] According to the novel auxiliary tooth stator permanent magnet type flux switching motor, the main tooth is provided with a first set of permanent magnet mounting groove for mounting the first set of permanent magnets.

[0012] Further, the bottom of the first set of permanent magnet mounting groove is provided with a magnetic bridge matched with the first set of permanent magnets.

[0013] According to the novel auxiliary tooth stator permanent magnet type flux switching motor, a pair of the second set of permanent magnets are arranged on the split tooth of each auxiliary tooth.

[0014] Further, the split tooth is in E shape.

[0015] Further, the end portion of the split tooth is respectively provided with a second set of permanent magnet mounting groove for mounting the second set of permanent magnets.

[0016] According to the novel auxiliary tooth stator permanent magnet type flux switching motor, the number of the main tooth and the auxiliary tooth is six, and the number of the rotor tooth is eleven.

[0017] Compared with the prior art, the novel auxiliary tooth stator permanent magnet type flux switching motor has the following beneficial effects:

[0018] 1. By arranging the split tooth at the end portion of each auxiliary tooth and arranging the second set of permanent magnets at the split tooth of each auxiliary tooth, the torque and efficiency of the motor are improved compared with the conventional E-shaped structure stator permanent magnet type flux switching motor through the analysis of MAXWELL finite element, and the motor is suitable for the application occasions with higher torque requirement under the same volume.

[0019] 2. By arranging the number of the rotor tooth on the rotor as odd number, the torque pulsation is small, the optimized torque pulsation can be reduced to within 10%, so as to improve the running stability and control precision of the motor, and the motor performs better in the application with high performance and high precision requirement.

[0020] 3. By arranging the first set of permanent magnet mounting groove and the magnetic bridge on the main tooth, the tangentially magnetized first set of permanent magnets are conveniently fixed to the main tooth, and the processing is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0022] Figure 1 Structure diagram of a traditional E-shaped stator permanent magnet flux switching motor;

[0023] Figure 2 Structure diagram of a novel auxiliary tooth stator permanent magnet flux switching motor in an embodiment of the present application;

[0024] Figure 3 Structure diagram of a stator core in an embodiment of the present application;

[0025] Figure 4 Partial structure diagram of a first set of permanent magnet installation groove bottom in an embodiment of the present application.

[0026] In the drawings,

[0027] 1, motor stator; 11, stator core; 12, main tooth; 121, first set of permanent magnet installation groove; 122, magnetic bridge; 13, auxiliary tooth; 131, split tooth; 1311, second set of permanent magnet installation groove; 14, embedded wire groove; 15, coil winding; 16, first set of permanent magnet; 17, second set of permanent magnet; 2, motor rotor; 21, rotor tooth. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail in combination with the drawings and embodiments. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, it is declared that the following described embodiments are only used to explain the present application, and do not limit the present application.

[0029] It should be noted that the terms "mounting", "setting", "connecting", "fixing" and the like should be interpreted broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited. The indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship commonly placed when the product of the application is used, or the orientation or position relationship commonly understood by those skilled in the art, or the orientation or position relationship commonly placed when the product of the application is used, only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application. The terms "first", "second" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implying the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0030] Figure 1 A conventional E-shaped structure stator permanent magnet type flux switching motor is shown, which includes a motor stator 1 and a motor rotor 2, the motor stator 1 is coaxially arranged with the motor rotor 2; the motor stator 1 includes a stator core 11, six main teeth 12 and six auxiliary teeth 13 are arranged on the inner side of the stator core 11 in a circumferential staggered and spaced manner, the six main teeth 12 and the six auxiliary teeth 13 form twelve embedded wire slots 14, corresponding coil windings 15 are arranged in the twelve embedded wire slots 14, and a first set of permanent magnets 16 is arranged on each of the six main teeth 12; the outer side of the motor rotor 2 is circumferentially spaced apart to form fourteen rotor teeth 21, and the motor rotor 2 has neither winding nor permanent magnet. The auxiliary teeth 13 can be designed to match the different rotor teeth 21 of the rotor to design the motor. In Figure 1 , A+ represents the A-phase coil winding inlet, A- represents the A-phase coil winding outlet, B+ represents the B-phase coil winding inlet, B- represents the B-phase coil winding outlet, C+ represents the C-phase coil winding inlet, and C- represents the C-phase coil winding outlet.

[0031] The E-shaped structure stator permanent magnet type flux switching motor described above has the advantages of simple structure, small size and large torque, but in some high torque demand occasions, its torque still cannot meet the requirements, resulting in that in some heavy load or high power output applications, the motor may not be able to provide sufficient driving force; at the same time, since the number of salient poles of the motor rotor 2 is even, there is an even harmonic, so the torque ripple is also relatively large.

[0032] In order to solve the above problems, please refer to Figure 2The utility model embodiment provides a novel auxiliary tooth stator permanent -magnetic type magnetic flux switching motor, including motor stator 1 and motor rotor 2, motor stator 1 is coaxial with motor rotor 2 arrangement. Motor stator 1 includes stator core 11, the inside of stator core 11 circumferential staggered interval is provided with a plurality of main tooth 12 and a plurality of auxiliary tooth 13, and the number of main tooth 12 is same with the number of auxiliary tooth 13. Every main tooth 12 all with adjacent auxiliary tooth 13 forms an embedded wire slot 14, and the coil winding 15 in embedded wire slot 14 is set up, and the coil winding 15 of each embedded wire slot 14 is single layer coil winding. Every main tooth 12 all is provided with first set permanent -magnet 16, and the end of every auxiliary tooth 13 is provided with split tooth 131, and second set permanent -magnet 17 is provided on split tooth 131. The outside of motor rotor 2 circumferential interval is provided with a plurality of rotor tooth 21, and the number of rotor tooth 21 is odd.

[0033] The novel auxiliary tooth stator permanent -magnetic type magnetic flux switching motor, by setting up split tooth 131 at the end of every auxiliary tooth 13, and setting up second set permanent -magnet 17 at split tooth 131 of every auxiliary tooth 13, compared with traditional E type structure stator permanent -magnetic type magnetic flux switching motor, the torque of motor is improved, is applicable to the application occasion of higher torque requirement under same volume;In addition, since the number of rotor tooth 21 on motor rotor 2 is set to odd, there is no even harmonic, and the torque pulsation is small, and the optimized torque pulsation can be reduced to within 10%, to improve the running stability and control precision of motor, so that the motor performs better in high performance and high precision requirement application.

[0034] In one embodiment, all unit structures in the motor stator 1 are tightly assembled together. The tight assembly design makes the motor stator 1 have high compactness in both radial and axial directions, which helps to reduce the overall volume and weight of the motor, and simplifies the manufacturing process of the motor.

[0035] In one embodiment, the first set of permanent magnets 16 are tangentially magnetized permanent magnets. The tangentially magnetized permanent magnets have a magnetization direction parallel to one side (usually the circumferential surface) of the permanent magnet, i.e. the magnetization direction is tangential to the circumference of the permanent magnet, so that the first set of permanent magnets 16 generates higher magnetic flux density in the air gap. In addition, since the magnetization direction is parallel to the motion direction (or current direction), the tangentially magnetized permanent magnets produce a more uniform magnetic field distribution, which helps to reduce leakage and magnetic resistance, thereby improving the performance and efficiency of the motor.

[0036] In one embodiment, the second set of permanent magnets 17 are tangentially magnetized permanent magnets. The tangentially magnetized permanent magnets have their magnetization direction parallel to one side (usually the circumferential surface) of the permanent magnet, i.e. the magnetization direction is tangential to the circumference of the permanent magnet, so that the second set of permanent magnets 17 generate a higher magnetic flux density in the air gap; in addition, since the magnetization direction is parallel to the direction of motion (or the direction of current), the magnetic field distribution generated by the tangentially magnetized permanent magnets is more uniform, which helps to reduce leakage and magnetic resistance, thereby improving the performance and efficiency of the motor.

[0037] Referring to Figure 3 , Figure 4 In one embodiment, the main tooth 12 is provided with a first set of permanent magnet mounting groove 121 for mounting the first set of permanent magnets 16, and the groove bottom of the first set of permanent magnet mounting groove 121 is provided with a magnetic bridge 122 matched with the first set of permanent magnets 16. The provision of the first set of permanent magnet mounting groove 121 ensures that the first set of permanent magnets 16 can be accurately and stably mounted on the main tooth 12. The shape, size and position of the first set of permanent magnet mounting groove 121 are carefully calculated to match the size and shape of the first set of permanent magnets 16, so as to avoid excessive gap or misalignment during installation. In addition, by providing the magnetic bridge 122 at the groove bottom of the first set of permanent magnet mounting groove 121, the magnetic bridge 122 not only serves as part of the magnetic circuit, but also functions to fix and support the first set of permanent magnets 16, ensuring the stability of the permanent magnets in the first set of permanent magnet mounting groove 121, preventing the permanent magnets from falling off due to vibration or centrifugal force during motor operation, and significantly reducing the processing difficulty of mounting and fixing the first set of permanent magnets 16 on the main tooth 12, thereby reducing production cost and improving production efficiency.

[0038] Referring to Figure 2 In one embodiment, a pair of second set of permanent magnets 17 are arranged on the split tooth 131 of each auxiliary tooth 13. By arranging a pair of second set of permanent magnets 17 on the split tooth 131 of each auxiliary tooth 13, the pair of second set of permanent magnets 17 play a supplementary and enhancing role in the magnetic circuit of the motor, which helps to improve the magnetic field strength and performance of the motor. By reasonably configuring the number and position of the second set of permanent magnets 17, the magnetic field distribution of the motor can be further optimized, which helps to reduce leakage and magnetic resistance, thereby improving the efficiency and output power of the motor.

[0039] Referring to Figure 3 Further, the split tooth 131 is in the shape of an E, so that the split tooth 131 itself has stronger structural strength and can withstand greater mechanical stress and electromagnetic force, which helps to reduce deformation and damage of the split tooth 131 during motor operation, thereby improving the reliability and durability of the motor. In addition,

[0040] Simultaneously, two mounting slots 1311 for installing the second set of permanent magnets 17 are formed on both sides of the split tooth 131. The design of the second set of permanent magnet mounting slots 1311 ensures that the second set of permanent magnets 17 can be accurately and stably installed onto the split tooth 131 of the auxiliary tooth 13, and also simplifies the installation of the second set of permanent magnets 17, improving the assembly efficiency and precision of the motor. The shape, size, and position of the second set of permanent magnet mounting slots 1311 have been carefully calculated to match the size and shape of the second set of permanent magnets 17, thereby avoiding excessive gaps or misalignments during installation.

[0041] Please see Figure 2 In one specific embodiment, there are six main teeth 12 and six auxiliary teeth 13, and the number of rotor teeth 21 on the electronic rotor is eleven. The six main teeth 12 and six auxiliary teeth 13 form twelve winding slots 14, and corresponding coil windings 15 are arranged in the twelve winding slots 14. The specific winding method is as follows: Figure 2 As shown. In Figure 2 In the diagram, A+ represents the incoming wire of phase A coil winding, A- represents the outgoing wire of phase A coil winding, B+ represents the incoming wire of phase B coil winding, B- represents the outgoing wire of phase B coil winding, C+ represents the incoming wire of phase C coil winding, and C- represents the outgoing wire of phase C coil winding. This winding method, through the rational arrangement of the incoming and outgoing wires of each phase coil winding 15, ensures that only one phase coil winding 15 resides within a single winding slot 14. This not only requires less insulation material but also simplifies the winding process, making the winding method easier and more conducive to manufacturing.

[0042] It should be noted that this utility model does not limit the number of main teeth 12 and auxiliary teeth 13, as long as the number of main teeth 12 and auxiliary teeth 13 is consistent; at the same time, it does not limit the number of rotor teeth 21 on the motor rotor 2, as long as the number of rotor teeth 21 is odd. Under the above-mentioned limitations, those skilled in the art can flexibly select the number of main teeth 12, auxiliary teeth 13 and rotor teeth 21 according to specific application requirements and the overall size of the motor, so that the motor can adapt to different working environments and performance requirements, thereby improving its versatility and practicality.

[0043] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

[0044] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.

Claims

1. A novel auxiliary toothed stator permanent magnet type flux switching motor, characterized by, The application relates to a motor stator and a motor rotor. The motor stator comprises a stator core, the inner side of the stator core is circumferentially staggered and spaced, a plurality of main teeth and a plurality of auxiliary teeth are arranged, the number of the main teeth is the same as that of the auxiliary teeth, a first set of permanent magnets is arranged on each main tooth, the end of each auxiliary tooth is provided with a split tooth, and a second set of permanent magnets is arranged on the split tooth. The motor rotor is coaxially arranged with the motor stator, and the outer side of the motor rotor is circumferentially spaced and provided with a plurality of rotor teeth, and the number of the rotor teeth is odd.

2. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 1, characterized in that, The first set of permanent magnets are tangentially magnetized permanent magnets.

3. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 1, characterized in that, The second set of permanent magnets are tangentially magnetized permanent magnets.

4. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 1, characterized in that, The main tooth is provided with a first set of permanent magnet mounting grooves for mounting the first set of permanent magnets.

5. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 4, characterized in that, The groove bottom of the first set of permanent magnet mounting grooves is provided with a magnetic bridge matched with the first set of permanent magnets.

6. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 1, characterized in that, The split tooth of each auxiliary tooth is provided with a pair of second set of permanent magnets.

7. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 6, characterized in that, The split tooth is in an E shape.

8. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 7, characterized by, The end of the split tooth is respectively provided with a second set of permanent magnet mounting groove for mounting the second set of permanent magnets.

9. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 1, characterized in that, The number of the main teeth and the auxiliary teeth is six.

10. The novel auxiliary tooth stator permanent magnet type flux switching motor according to claim 9, characterized by, The number of the rotor teeth is eleven.

Images