Novel stator permanent magnet type rotor skewed slot magnetic flux switching motor

Abstract

The utility model discloses a novel stator permanent magnet type rotor skewed slot 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 stator iron core; each main tooth is provided with a first set of permanent magnets, the end part of each auxiliary tooth is provided with a pole shoe, and the pole shoe 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 even number. According to the utility model, the torque of the motor is improved, 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, specifically to a novel stator permanent magnet type rotor skew slot magnetic flux switching motor. BACKGROUND

[0002] Permanent magnet type magnetic flux switching motor structure is simple, 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's 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 big. UTILITY MODEL CONTENTS

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

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

[0006] A novel stator permanent magnet type rotor skew slot 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 pole shoe, and second set of permanent magnet is arranged on the pole shoe;

[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 even.

[0009] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the motor rotor is composed of motor rotor segments with different rotation angles.

[0010] Further, the motor rotor is composed of two motor rotor segments with different rotation angles.

[0011] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the first set of permanent magnets are tangentially magnetized permanent magnets.

[0012] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the main teeth are provided with a first set of permanent magnet mounting grooves for mounting the first set of permanent magnets.

[0013] Further, the bottom of the first set of permanent magnet mounting grooves is provided with a magnetic bridge matched with the first set of permanent magnets.

[0014] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the pole shoes of each auxiliary tooth are provided with a pair of second set of permanent magnets.

[0015] Further, the pole shoes are T-shaped, and the two sides of the pole shoes are respectively provided with second set of permanent magnet mounting grooves for mounting the second set of permanent magnets.

[0016] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the second set of permanent magnets are tangentially magnetized permanent magnets.

[0017] According to the novel stator permanent magnet type rotor skew slot magnetic flux switching motor, the number of the main teeth and the auxiliary teeth is six, and the number of the rotor teeth is fourteen.

[0018] Compared with the prior art, the novel stator permanent magnet type rotor skew slot magnetic flux switching motor has the following beneficial effects:

[0019] 1. By arranging the pole shoes at the end of each auxiliary tooth and arranging the second set of permanent magnets at the pole shoes of each auxiliary tooth, compared with the traditional E-shaped structure stator permanent magnet type magnetic flux switching motor, the torque of the motor is improved, and the motor is suitable for application occasions with higher torque requirements under the same volume.

[0020] 2. By means of the rotor stepped segmented skew slot, the motor torque pulsation is controlled within an acceptable range, so as to improve the operation stability and control accuracy of the motor.

[0021] 3. By setting the first set of permanent magnet installation slot and magnetic bridge on the main tooth, the tangential magnetized first set of permanent magnet is fixed to the main tooth, and the processing is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in 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 are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 It is a structural schematic diagram of a traditional E-shaped stator permanent magnet type magnetic flux switching motor.

[0024] Figure 2 It is a structural schematic diagram of a novel stator permanent magnet type rotor skew slot magnetic flux switching motor in an embodiment of the present application.

[0025] Figure 3 It is a structural schematic diagram of a stator core in an embodiment of the present application.

[0026] Figure 4 It is a partial schematic diagram of a first set of permanent magnet installation slot bottom in an embodiment of the present application.

[0027] In the drawings,

[0028] 1. Motor stator; 11, stator core; 12, main tooth; 121, first set of permanent magnet installation slot; 122, magnetic bridge; 13, auxiliary tooth; 131, pole shoe; 1311, second set of permanent magnet installation slot; 14, embedded wire slot; 15, coil winding; 16, first set of permanent magnet; 17, second set of permanent magnet; 2, motor rotor; 21, rotor tooth. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, 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 the subsequent drawings. At the same time, it is declared that the following described embodiments are only for explaining the present application, and are not used to limit the present application.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] In order to solve the above problems, please refer to Figure 2The utility model embodiment provides a novel stator permanent magnet type rotor skew slot magnetic flux switching motor, including motor stator 1 and motor rotor 2, motor stator 1 is coaxial with motor rotor 2 setting. Motor stator 1 includes stator core 11, the inside of stator core 11 circumferential staggered interval is provided with a plurality of main teeth 12 and a plurality of auxiliary teeth 13, and the number of main teeth 12 is same with the number of auxiliary teeth 13. Every main tooth 12 all forms an embedded wire slot 14 with adjacent auxiliary tooth 13, and the coil winding 15 in embedded wire slot 14 is provided, and the coil winding 15 of each embedded wire slot 14 is single layer coil winding. Every main tooth 12 is provided with first set permanent magnet 16, and the end of every auxiliary tooth 13 is provided with pole shoe 131, and pole shoe 131 is provided with second set permanent magnet 17. The outside of motor rotor 2 circumferential interval is provided with a plurality of rotor teeth 21, and the number of rotor teeth 21 is even.

[0034] The novel stator permanent magnet type rotor skew slot magnetic flux switching motor, by setting pole shoe 131 at the end of every auxiliary tooth 13, and setting second set permanent magnet 17 at the pole shoe 131 of every auxiliary tooth 13, compared with traditional E type structure stator permanent magnet type magnetic flux switching motor, the torque of motor is improved, is applicable to the application occasion of higher torque requirement under same volume.

[0035] In one embodiment, the motor rotor 2 is composed of a plurality of motor rotor segments with different rotation angles, and the motor rotor segments are composed of silicon steel sheets. After the silicon steel sheets of the first segment rotor are stacked, the silicon steel sheets of the second segment rotor are stacked with a slight angle offset. Since the number of rotor teeth 21 of the motor rotor 2 is even, there is an even harmonic, and therefore the torque pulsation is relatively large. Therefore, in this embodiment, the motor torque pulsation is controlled within an acceptable range by using the rotor stepped segmented skew slot method, so as to improve the running stability and control accuracy of the motor. After the motor rotor 2 adopts the stepped segmented skew slot, the electromagnetic torque and induced electromotive force formed can effectively weaken the harmonic electromotive force generated by the tooth harmonic magnetic field, thereby weakening the additional torque caused by these harmonic magnetic fields. Preferably, the motor rotor 2 is divided into two segments, i.e., the motor rotor segment of the first segment is stacked with a certain angle offset from the motor rotor segment of the second segment. The torque pulsation can be reduced to below 20%. It should be understood that in other embodiments, the motor rotor 2 can also be composed of three or more motor rotor segments with different rotation angles, but the more motor rotor segments will make the processing technology of the motor rotor 2 more difficult and the production and processing cost higher.

[0036] 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 the radial and axial directions, which helps to reduce the overall volume and weight of the motor, and simplifies the manufacturing process of the motor.

[0037] In one embodiment, the first set of permanent magnets 16 are tangentially magnetized permanent magnets. Tangentially magnetized permanent magnets have their magnetization direction parallel to one side of the permanent magnet, usually the circumferential surface, i.e. the magnetization direction is tangential to the circumference of the permanent magnet, so that the first set of permanent magnets 16 generates a higher magnetic flux density in the air gap; in addition, since the magnetization direction is parallel to the direction of motion (or current direction), the tangentially magnetized permanent magnets generate a more uniform magnetic field distribution, which helps to reduce leakage and magnetic resistance, thereby improving the performance and efficiency of the motor.

[0038] In one embodiment, the second set of permanent magnets 17 are tangentially magnetized permanent magnets. Tangentially magnetized permanent magnets have their magnetization direction parallel to one side of the permanent magnet, usually the circumferential surface, i.e. the magnetization direction is tangential to the circumference of the permanent magnet, so that the second set of permanent magnets 17 generates a higher magnetic flux density in the air gap; in addition, since the magnetization direction is parallel to the direction of motion (or current direction), the tangentially magnetized permanent magnets generate a more uniform magnetic field distribution, which helps to reduce leakage and magnetic resistance, thereby improving the performance and efficiency of the motor.

[0039] Please refer 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 cooperating 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 a 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 serves as a fixing and supporting function for 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.

[0040] Please refer to Figure 2In one embodiment, a pair of second set of permanent magnets 17 is arranged on the pole shoe 131 of each auxiliary tooth 13. By arranging a pair of second set of permanent magnets 17 on the pole shoe 131 of each auxiliary tooth 13, the pair of second set of permanent magnets 17 plays a role of supplement and enhancement 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 the magnetic flux leakage and magnetic resistance, and improve the efficiency and output power of the motor.

[0041] Referring to Figure 3 Further, the pole shoe 131 is in T shape, which helps to enhance the mechanical strength and stability of the pole shoe 131, and the T-shaped structure makes the pole shoe 131 play a better guiding and focusing role in the magnetic circuit of the motor, which helps to optimize the distribution of the magnetic field. At the same time, the two sides of the pole shoe 131 respectively form a second set of permanent magnet mounting groove 1311 for mounting the second set of permanent magnets 17. The arrangement of the second set of permanent magnet mounting groove 1311 ensures that the second set of permanent magnets 17 can be accurately and stably mounted on the pole shoe 131 of the auxiliary tooth 13. The shape, size and position of the second set of permanent magnet mounting groove 1311 are carefully calculated to match the size and shape of the second set of permanent magnets 17, so as to avoid excessive gap or misplacement during installation.

[0042] Referring to Figure 2 In one specific embodiment, the number of the main teeth 12 and the auxiliary teeth 13 is six, and the number of the rotor teeth 21 on the electronic rotor is fourteen. The six main teeth 12 and the six auxiliary teeth 13 form twelve embedded wire slots 14, and the corresponding coil windings 15 are arranged in the twelve embedded wire slots 14. The specific winding mode is shown in Figure 2 In Figure 2 , A+ represents the A-phase coil winding inlet wire, A- represents the A-phase coil winding outlet wire, B+ represents the B-phase coil winding inlet wire, B- represents the B-phase coil winding outlet wire, C+ represents the C-phase coil winding inlet wire, and C- represents the C-phase coil winding outlet wire. The above winding mode, by reasonably arranging the inlet and outlet wires of each phase coil winding 15, makes only the coil windings 15 of the same phase in one embedded wire slot 14, which not only needs less insulation material, but also can simplify the wire embedding process, and the winding mode becomes more simple during processing, which is more conducive to processing.

[0043] It should be noted that the utility model is not limited to the number of main teeth 12 and auxiliary teeth 13, the number of main teeth 12 and auxiliary teeth 13 only needs to be consistent; at the same time, the number of rotor teeth 21 on motor rotor 2 is not limited, the number of rotor teeth 21 can be even, and the person skilled in the art can flexibly select the number of main teeth 12, auxiliary teeth 13 and rotor teeth 21 according to the specific application requirement and the overall size of the motor under the above limitation, so that the motor can adapt to different working environments and performance requirements, thereby improving the versatility and practicality.

[0044] It should be understood that the above description can be improved or changed by those skilled in the art, and all these improvements and changes shall belong to the protection scope of the claims of the utility model.

[0045] The utility model patent has been described above in conjunction with the drawings, and obviously the implementation of the utility model patent is not limited to the above-mentioned manner, as long as various improvements are made by adopting the method concept and technical scheme of the utility model patent, or the concept and technical scheme of the utility model patent is directly applied to other occasions without improvement, which is within the protection scope of the utility model.

Claims

1. A novel stator permanent magnet type rotor skewed slot flux switching motor characterized by, The motor stator comprises a stator core, and a plurality of main teeth and a plurality of auxiliary teeth are circumferentially staggered and spaced on the inner side of the stator core, 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, and a pole shoe is arranged at the end of each auxiliary tooth, and a second set of permanent magnets is arranged on the pole shoe. The motor rotor is coaxially arranged with the motor stator, and a plurality of rotor teeth are circumferentially spaced on the outer side of the motor rotor, and the number of the rotor teeth is even. The motor rotor is composed of a plurality of motor rotor segments with different rotation angles, and the motor rotor segments are composed of silicon steel sheets.

2. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, characterized by, The motor rotor is composed of two motor rotor segments with different rotation angles.

3. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 2, characterized by, The first set of permanent magnets are tangentially magnetized permanent magnets.

4. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, characterized by, The main teeth are provided with a first set of permanent magnet mounting grooves for mounting the first set of permanent magnets.

5. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, wherein, The 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 stator permanent magnet type rotor skewed slot flux switching motor of claim 5, wherein, A pair of second set of permanent magnets is arranged on the pole shoe of each auxiliary tooth.

7. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, wherein, The pole shoe is in T shape, and the two sides of the pole shoe form second set of permanent magnet mounting grooves for mounting the second set of permanent magnets.

8. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 7, wherein, The second set of permanent magnets are tangentially magnetized permanent magnets.

9. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, wherein, The number of the main teeth and the number of the auxiliary teeth are both six, and the number of the rotor teeth is fourteen.

10. The novel stator permanent magnet type rotor skewed slot flux switching motor of claim 1, wherein, ​

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