Rotor structure and motor of permanent magnet assisted reluctance motor with self-starting hybrid excitation

Abstract

The present invention provides a rotor structure and a motor of a self-starting hybrid excitation permanent magnet assisted reluctance motor. The rotor structure includes a rotor core, and a plurality of magnetic barrier slots are provided on the rotor core. A permanent magnet is arranged in at least one of the plurality of magnetic barrier slots, and a non-magnetic conductor is arranged in at least one of the remaining plurality of magnetic barrier slots. The permanent magnet assisted reluctance motor of this structure has the function of out-of-step protection. Since the non-magnetic conductor is arranged in the rotor core, the non-magnetic conductor has the function of a damping winding. When the motor is running synchronously, the transient impact current of the rotor in various abnormal states can be guided to the end of the rotor to offset each other and return to zero, thereby avoiding heating of the rotor structure and demagnetization of the magnetic steel. The rotor structure adopting this structure effectively improves the efficiency and practicality of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a rotor structure and a motor of a self-starting hybrid excitation permanent magnet assisted reluctance motor. Background Art

[0002] Permanent magnet assisted reluctance motor is currently one of the development directions of permanent magnet synchronous motor. In the field of household appliances, ferrite assisted reluctance compressors are gradually replacing DC rare earth compressors. In the field of industrial motors, industrial reluctance motors are replacing YE3 induction motors, and rare earth permanent magnet synchronous motors driven by automobiles may also be replaced by permanent magnet assisted reluctance motors.

[0003] At present, industrial permanent magnet assisted reluctance motors have been used in water pumps or fans. Bus drive motors are high-power, high-output torque motors, which generally use rare earth permanent magnet synchronous motors. However, with permanent magnet assisted reluctance motors, cheap ferrites can be used as auxiliary magnetic materials, without expensive rare earth permanent magnets. This is a huge technological advancement. In the existing technology, there are three types of rotor structures for reluctance motors in the motor industry:

[0004] The first type, in which the magnetic barrier slots are not filled, belongs to the non-auxiliary magnetic reluctance motor, that is, the ordinary reluctance motor, such as Figure 1 The second type is that the magnetic barrier slot is filled with metal non-magnetic material. This type of reluctance motor belongs to the self-starting non-auxiliary magnetic reluctance motor, such as Figure 2 The third type is to fill the magnetic barrier slot with permanent magnets, such as Figure 3 As shown, the permanent magnet assisted reluctance motor with this structure is a full auxiliary reluctance motor because the magnetic barrier slots are all filled with permanent magnets for auxiliary excitation. It has no self-starting function and is a non-self-starting motor.

[0005] The motor structure in the prior art has the following defects:

[0006] 1. There is no asynchronous starting and running function. Once the load exceeds the maximum reluctance torque of the motor, the motor will lose synchronous operation and the rotor speed will gradually drop to zero. The motor can only be restarted after the load is reduced.

[0007] 2. There is no abnormal protection function. When the stator three-phase unbalance or asymmetric short circuit occurs in the reluctance motor, a transient axial impact current will appear in the rotor. This current is very large and may cause the magnetic steel to demagnetize or the rotor to heat up and burn out.

[0008] 3. The rotor core is made of laminated sheets and fixed with rivets. This structure has the following disadvantages:

[0009] (1) Additional eddy currents are generated around the rivets (which would not occur without these fixing rivets), increasing the heating of the rotor.

[0010] (2) Since the contact area between the rivet head and the core is small, and the core requires a certain "stacking coefficient" (i.e. compression), the end of the core is not flat after the core is riveted, and the axial dimensions of the riveted position and other positions of the core are different (the difference is large), which will also cause the rotor eddy current to increase. Summary of the invention

[0011] The main purpose of the present invention is to provide a rotor structure and a motor of a self-starting hybrid excitation permanent magnet assisted reluctance motor, so as to solve the problem that the rotor structure is prone to heating in the prior art.

[0012] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a rotor structure of a self-starting hybrid excitation permanent magnet assisted reluctance motor is provided, comprising: a rotor core, a plurality of magnetic barrier slots are opened on the rotor core, a permanent magnet is arranged in at least one of the plurality of magnetic barrier slots, and a non-magnetic conductor is arranged in at least one of the remaining plurality of magnetic barrier slots.

[0013] Furthermore, multiple magnetic barrier slots are arranged at intervals along the radial direction of the rotor core to form magnetic barrier slot groups, there are multiple magnetic barrier slot groups, and multiple magnetic barrier slot groups are arranged at intervals along the circumferential direction of the rotor core, and at least one of the multiple magnetic barrier slot groups is provided with a permanent magnet and a non-magnetic conductor.

[0014] Furthermore, each magnetic barrier groove group includes at least two layers of magnetic barrier grooves.

[0015] Furthermore, the magnetic barrier slot group includes a first layer of magnetic barrier slots and a second layer of magnetic barrier slots, the first layer of magnetic barrier slots is arranged close to one side of the axial hole of the rotor core, the second layer of magnetic barrier slots is located on the outside of the first layer of magnetic barrier slots, one of the first layer of magnetic barrier slots and the second layer of magnetic barrier slots is provided with a permanent magnet, and the other of the first layer of magnetic barrier slots and the second layer of magnetic barrier slots is provided with a non-magnetic conductor.

[0016] Furthermore, in each magnetic barrier slot group, the magnetic barrier slot on the side close to the shaft hole of the rotor core is formed by at least two component segments, and a magnetic isolation bridge is provided between two adjacent component segments.

[0017] Furthermore, the cross section of the magnetic barrier groove is in a straight line or an arc shape.

[0018] Furthermore, the first layer of magnetic barrier grooves includes a first component segment and a second component segment, and a magnetic isolation bridge is arranged between the first component segment and the second component segment.

[0019] Further, the non-magnetic conductor is made of copper or aluminum.

[0020] Furthermore, the rotor structure also includes: end baffles, there are two end baffles, the two end baffles are respectively arranged at both ends of the rotor core and connected to the non-magnetic conductor, wherein the rotor core includes a plurality of core punchings, and the plurality of core punchings are pressed by the end baffles to form the rotor core.

[0021] Furthermore, the number of poles of the rotor structure is P, where P=2N, and N is a positive integer greater than or equal to 1.

[0022] Furthermore, the rotor core is provided with a plurality of through holes, which are arranged at intervals along the outer edge of the rotor core, and are arranged one-to-one correspondingly to the plurality of magnetic barrier slot groups, and are used to fill permanent magnets and non-magnetic conductors.

[0023] Furthermore, the cross section of the through hole is at least one of polygonal, circular, and elliptical.

[0024] Further, the through holes are arranged symmetrically about the cross axis of the rotor core.

[0025] Furthermore, each magnetic barrier groove group includes multiple layers of magnetic barrier grooves, the cross-sections of the multiple layers of magnetic barrier grooves are all linear, at least two layers of the magnetic barrier grooves in the multiple layers of magnetic barrier grooves include multiple component segments, and at least one of the multiple component segments is used to set a permanent magnet or a non-magnetic conductor.

[0026] Further, the magnetic properties of the end stop and the non-magnetic conductor are the same.

[0027] According to another aspect of the present invention, a self-starting hybrid excitation permanent magnet assisted reluctance motor is provided, comprising a rotor structure, which is the above-mentioned rotor structure.

[0028] By applying the technical solution of the present invention, a plurality of magnetic barrier slots are provided on the rotor core, and permanent magnets and non-magnetic conductors are arranged in the plurality of magnetic barrier slots. Such an arrangement enables the motor having the rotor structure to have an asynchronous starting function. When the motor loses step due to overload, the motor can also operate asynchronously in the manner of an induction motor. The permanent magnet assisted reluctance motor of this structure has the function of losing step protection. Since the non-magnetic conductor is arranged in the rotor core, the non-magnetic conductor has the function of a damping winding. When the motor runs synchronously, the transient impact current that occurs in the rotor under various abnormal conditions can be directed to the rotor end to offset each other and return to zero, thereby avoiding heating of the rotor structure and demagnetization of the magnetic steel. The rotor structure adopting this structure effectively improves the efficiency and practicality of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0030] Figure 1 The embodiment of the prior art in which the rotor core only has magnetic barrier slots without filling is shown;

[0031] Figure 2 An embodiment of the prior art in which the magnetic barrier slots on the rotor core are filled with only non-magnetic conductors is shown;

[0032] Figure 3 An embodiment of the prior art in which the magnetic barrier slots on the rotor core are filled with only permanent magnets is shown;

[0033] Figure 4 A schematic structural diagram of a first embodiment of a rotor core according to the present invention is shown;

[0034] Figure 5 Shows Figure 4 A schematic cross-sectional view of the embodiment along the A-A line;

[0035] Figure 6 Shows Figure 4 A schematic cross-sectional view of an embodiment of a rotor core;

[0036] Figure 7 A schematic structural diagram of a second embodiment of a rotor core according to the present invention is shown;

[0037] Figure 8 Shows Figure 7 A schematic cross-sectional view of an embodiment of a rotor core;

[0038] Fig. 9 A schematic structural diagram of a third embodiment of a rotor core according to the present invention is shown;

[0039] Fig.10 Shows Fig. 9 A schematic cross-sectional view of an embodiment of a rotor core;

[0040] Fig.11 A schematic structural diagram of a fourth embodiment of a rotor core according to the present invention is shown;

[0041] Fig.12 Shows Fig.11 A schematic cross-sectional view of an embodiment of a rotor core;

[0042] Fig.13 A schematic structural diagram of a fifth embodiment of a rotor core according to the present invention is shown;

[0043] Fig.14 Shows Fig.13 A schematic cross-sectional view of an embodiment of a rotor core;

[0044] Fig.15A schematic structural diagram of a sixth embodiment of a rotor core according to the present invention is shown;

[0045] Fig.16 A schematic structural diagram of a seventh embodiment of a rotor core according to the present invention is shown;

[0046] Fig.17 A schematic structural diagram of an eighth embodiment of a rotor core according to the present invention is shown;

[0047] Fig.18 A schematic structural diagram of an embodiment of an end baffle and a non-magnetic conductor of a rotor core according to the present invention is shown;

[0048] Fig.19 Shows Fig.18 A schematic cross-sectional view of the embodiment along the A-A line;

[0049] Fig. 20 A schematic structural diagram of another embodiment of the end baffle and the non-magnetic conductor of the rotor core according to the present invention is shown.

[0050] The above drawings include the following reference numerals:

[0051] 10. Rotor core;

[0052] 11, first layer of magnetic barrier grooves; 111, first component segment; 112, second component segment;

[0053] 12. Second layer magnetic barrier groove; 13. Axis hole; 14. Through hole; 15. Magnetic isolation bridge;

[0054] 20. Permanent magnet;

[0055] 30. Non-magnetic conductor;

[0056] 40. End baffle. DETAILED DESCRIPTION

[0057] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0058] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0059] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0060] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0061] Combination Figures 4 to 20 As shown, according to a specific embodiment of the present application, a rotor structure of a self-starting hybrid excitation permanent magnet assisted reluctance motor is provided, including: a rotor core 10, a plurality of magnetic barrier slots are opened on the rotor core 10, a permanent magnet 20 is arranged in at least one of the plurality of magnetic barrier slots, and a non-magnetic conductor 30 is arranged in at least one of the remaining plurality of magnetic barrier slots.

[0062] In this embodiment, a plurality of magnetic barrier slots are provided on the rotor core, and permanent magnets and non-magnetic conductors are arranged in the plurality of magnetic barrier slots, so that the motor having the rotor structure has an asynchronous starting function. When the motor loses step due to overload, the motor can also run asynchronously for a period of time in the manner of an induction motor, so the permanent magnet assisted reluctance motor of this structure has the function of losing step protection. Since the non-magnetic conductor is arranged in the rotor core, the non-magnetic conductor has the function of damping winding of the synchronous motor. When the motor runs synchronously, the transient impact current of the rotor in various abnormal states can be directed to the rotor end to offset each other and return to zero, thereby avoiding heating of the rotor structure and demagnetization of the magnetic steel. The rotor structure adopting this structure effectively improves the efficiency and practicality of the motor. At the same time, in view of the current characteristics of multiple varieties and multiple working conditions of permanent magnet synchronous motors, while keeping the rotor punching structure unchanged, the magnetic barrier slots can be filled by different combinations of permanent magnets and non-magnetic conductors to meet the needs of different working conditions, which greatly improves the efficiency of new product development and reduces the cost of new product development (reducing the number of rotor punching mold openings). Among them, the out-of-step mentioned here refers to the situation where the permanent magnet synchronous motor is overloaded to a certain extent, causing the rotor speed to be lower than the stator rotating magnetic field speed (synchronous speed).

[0063] Among them, a plurality of magnetic barrier slots are arranged at intervals along the radial direction of the rotor core 10 to form a magnetic barrier slot group, there are a plurality of magnetic barrier slot groups, and the plurality of magnetic barrier slot groups are arranged at intervals along the circumferential direction of the rotor core 10, and at least one magnetic barrier slot group of the plurality of magnetic barrier slot groups is provided with a permanent magnet 20 and a non-magnetic conductor 30. In the present application, the arrangement of the non-magnetic permanent magnet and the permanent magnet in each permanent magnet Cao group can be changed according to different requirements, and such an arrangement can effectively improve the stability of the motor and the matching and practicality of the motor under different working conditions.

[0064] In the present application, each magnetic barrier slot group includes at least two layers of magnetic barrier slots. Specifically, the magnetic barrier slot group includes a first layer of magnetic barrier slots 11 and a second layer of magnetic barrier slots 12. The first layer of magnetic barrier slots 11 is arranged near the side of the shaft hole 13 of the rotor core 10, and the second layer of magnetic barrier slots 12 is located outside the first layer of magnetic barrier slots 11. One of the first layer of magnetic barrier slots 11 and the second layer of magnetic barrier slots 12 is provided with a permanent magnet 20, and the other of the first layer of magnetic barrier slots 11 and the second layer of magnetic barrier slots 12 is provided with a non-magnetic conductor 30. Figure 5 As shown, a non-magnetic conductor 30 is disposed in the first layer of magnetic barrier slots 11 , and a permanent magnet 20 is disposed in the second layer of magnetic barrier slots 12 .

[0065] like Figure 7As shown, in each magnetic barrier slot group, the magnetic barrier slot on the side close to the shaft hole 13 of the rotor core 10 is formed by at least two component segments, and a magnetic isolation bridge 15 is provided between two adjacent component segments. Specifically, the first layer of magnetic barrier slots 11 includes a first component segment 111 and a second component segment 112. A magnetic isolation bridge 15 is provided between the first component segment 111 and the second component segment 112. This arrangement can improve the strength of the rotor core 10, while optimizing the magnetic circuit of the rotor core, and effectively improve the performance of the motor.

[0066] like Fig.11 As shown, each magnetic barrier slot group has three layers of magnetic barrier slot groups. The magnetic barrier slots on the side close to the shaft hole 13 of the rotor core 10 are composed of two segments. Permanent magnets are arranged in the segments. Permanent magnets are arranged in the outer magnetic barrier slots, and non-magnetic conductors are arranged in the middle magnetic barrier slots.

[0067] According to another embodiment of the present application, the cross section of the magnetic barrier groove is arranged in a straight line or an arc shape. Specifically, each magnetic barrier groove group includes a plurality of magnetic barrier grooves, the cross section of the multi-layer magnetic barrier grooves are all straight lines, at least two layers of magnetic barrier grooves in the multi-layer magnetic barrier grooves include a plurality of component segments, and at least one of the plurality of component segments is used to set the permanent magnet 20 or the non-magnetic conductor 30. Fig.15 As shown, the cross section of the magnetic barrier slot is arranged in a straight line, and the number of poles of the rotor structure is two poles, wherein the two layers of magnetic barrier slots on one side of the shaft hole close to the rotor core each include a structure of two component segments, one layer is used to arrange the permanent magnet 20, and the other layer is used to place the non-magnetic conductor 30. Such an arrangement can also play a role in improving the efficiency of the motor.

[0068] The rotor structure in the present application has a pole number of P, where P=2N, and N is a positive integer greater than or equal to 1.

[0069] like Figures 17 to 20 As shown, the rotor structure also includes an end baffle 40. There are two end baffles 40, which are respectively arranged at both ends of the rotor core 10 and connected to the non-magnetic conductor 30, wherein the rotor core 10 includes a plurality of core punchings, and the plurality of core punchings are pressed by the end baffles 40 to form the rotor core 10. By using the end baffles 40 to press and fix the rotor core punchings, the method of fixing the rotor core punchings by rivets in the prior art is avoided, so that the rotor has a high stacking coefficient and a good consistency in the rotor length size, which can reduce the rotor eddy current, reduce the rotor heating, and improve the motor efficiency. At the same time, removing the rivets can reduce the rotor additional loss, and can also reduce the effect of rotor heating. Among them, the material of the end baffle 40 is the same or similar to that of the non-magnetic conductor 30.

[0070] Preferably, the non-magnetic conductor 30 is made of copper or aluminum. This configuration enables the metal non-magnetic conductor to function as a damping winding, and during synchronous operation, it can guide the transient impact current that occurs in the rotor under various abnormal conditions and offset each other to zero at the end baffle, thereby reducing the risk of rotor heating and demagnetization of the magnetic steel.

[0071] like Fig.13 As shown, the rotor core 10 is also provided with a plurality of through holes 14, which are arranged at intervals along the outer edge of the rotor core 10, and the plurality of through holes 14 are arranged one by one corresponding to the plurality of magnetic barrier slot groups, and the through holes 14 are used to fill the permanent magnets 20 and the non-magnetic conductors 30. Such an arrangement can effectively reduce the pulsation of the rotor structure and effectively improve the stability of the motor.

[0072] Preferably, the cross section of the through hole 14 is at least one of polygonal, circular and elliptical.

[0073] Preferably, the through holes 14 are arranged symmetrically about the cross axis of the rotor core 10. Such an arrangement can optimize the magnetic circuit of the rotor core, effectively reduce the pulsation of the rotor structure, and improve the stability of the motor.

[0074] The rotor structure in the above embodiment can also be used in the technical field of motor equipment, that is, according to another aspect of the present invention, a self-starting hybrid excitation permanent magnet assisted reluctance motor is provided, including a rotor structure, and the rotor structure is the rotor structure in the above embodiment. The reluctance motor with this rotor structure, from the perspective of motor principles, belongs to a semi-auxiliary magnetic hybrid excitation reluctance motor; from the perspective of engineering technology, permanent magnets and non-magnetic conductors can be freely combined to fill the magnetic barrier slots, so that the motor has different output characteristics to adapt to different motor operating conditions. Due to the use of different ways of filling the magnetic barrier slots, there is no need to make new rotor punchings, which can greatly shorten the time for new product development and improve the efficiency of new product development.

[0075] Specifically, in the prior art, the rotor punchings are first stacked, and then rivets are used to pass through the mounting holes to fix the rotor core punchings, and then the permanent magnets are filled in the magnetic barrier slots. Only when the core is inserted into the shaft can the end baffles be added to block the magnetic steel to prevent axial movement. The end baffles also need to be fixed separately. That is to say, the rotor core of the existing scheme is a part made of stacked silicon steel sheets. The present application can use cast aluminum or copper bars and end baffles to make the rotor core into a whole, similar to a squirrel cage rotor, so that the rotor punchings, permanent magnets, and rotor end baffles can be connected into a whole, and then the shaft is installed to form a rotor assembly. In other words, the rotor core of the present application is a rotor assembly composed of a core stacked with silicon steel sheets, a permanent magnet, a non-magnetic conductor, and an end baffle. The structure is simpler and the integrity and structural strength are better.

[0076] Since the rivet holes for stacking and locking the rotor core are eliminated in the present application, the additional loss of the rotor can be reduced. By pressing the rotor core with the end baffle, the stacking coefficient of the rotor core is higher and the performance is better.

[0077] The existing self-starting permanent magnet synchronous motor generally has many small slots on the outer circle of the rotor like the induction motor rotor. This structure will increase the magnetic saturation degree of the rotor surface, increase the tooth slot resonance of the motor, and increase the electromagnetic noise. The rotor structure of the present application avoids this problem. The magnetic barrier slot (the reluctance slot of the reluctance motor must have, otherwise it is not a reluctance motor) is filled with metal non-magnetic materials such as copper and aluminum, which can not only realize the self-starting of the permanent magnet assisted reluctance motor, but also improve the power factor of the motor.

[0078] The reluctance motor in this application is a motor with at least two magnetic barrier slots in the radial direction of the motor rotor magnetic poles to generate reluctance torque, that is, xd>xq, and the direct axis reactance is greater than the quadrature axis reactance. The permanent magnet assisted reluctance motor is a motor that fills the magnetic barrier slots with permanent magnets, which can improve the power density of the reluctance motor.

[0079] The technical solution of the present application is to provide a semi-auxiliary magnetic permanent magnet assisted reluctance motor. In view of the structural characteristics that the magnetic barrier slot of the reluctance motor has multiple layers in the radial direction of the magnetic pole, a semi-auxiliary magnetic reluctance motor rotor with a completely new structure is formed by using permanent magnets and non-magnetic metal conductors to fill the magnetic barrier slots in a mixed manner according to a certain rule. The motor excitation method in the present application is different from that of ordinary reluctance motors and permanent magnet assisted reluctance motors. As mentioned above, the magnetic barrier slots of ordinary reluctance motors are without auxiliary excitation, and the magnetic barrier slots of the current permanent magnet assisted reluctance motors are all auxiliary excitation. The permanent magnet assisted reluctance motor formed by the technical solution in the present application has a semi-auxiliary magnetic or mixed excitation structure of the rotor magnetic barrier slots. Theoretically, the technical solution of the present application can be started and operated in an asynchronous state, so it can maintain the electromagnetic torque for a certain period of time when the permanent magnet synchronous motor is out of step. It provides abnormal protection for the motor. At the same time, during synchronous operation, it can also provide abnormal protection, thereby improving the reliability of motor operation. In addition, the main performance of the motors is significantly different for the punching sheets and rotors of various schemes. Therefore, in actual work, different rotor design schemes can be selected for various working conditions of the motors. Under certain conditions, since the rotor punching structure can be kept unchanged, only the combination of permanent magnets and non-magnetic conductors needs to be changed, which greatly improves the development efficiency, is very suitable for the current multi-variety characteristics of the non-standard design of permanent magnet synchronous motors, and reduces the cost of new product development.

[0080] The motor provided by the present application, such a permanent magnet synchronous motor with self-starting performance, can be applied to all reluctance motors, but from the actual effect, it is more suitable for permanent magnet assisted reluctance motors with relatively large rotor diameters. Because the rotor diameter is large, there are many variations in the reluctance slots opened, and there are many electromagnetic design schemes. The more the number of radially superimposed magnetic barrier slots, the greater the reluctance torque of the motor, and the more combinations of permanent magnets and non-magnetic conductors.

[0081] This patent proposal can have a variety of derivative solutions. For example, the magnetic barrier slots can have 2 slots, 3 slots, or more slots per pole. The combination of permanent magnets and metal non-magnetic conductors can be selected according to actual needs (permanent magnet synchronous motors are non-standard designs, so the motor structure and solution need to be determined according to the motor working conditions). However, the arrangement must satisfy the symmetrical distribution of the rotor cross axis. The motor can also be 2-pole, 4-pole, 6-pole, 8-pole..., multi-pole settings.

[0082] From a process perspective, the permanent magnets that fill the magnetic barrier slots are assembled in the same way as the existing permanent magnet assisted reluctance motor rotor assembly process. The non-magnetic conductors that fill the magnetic barrier slots can be cast using materials such as copper and aluminum (magnetized later); they can also be inserted using molded copper bars and then welded (or riveted) to the copper end baffles. In this process, the magnetic steel can be magnetized first. The manufacturing process of non-magnetic conductors is similar to the manufacturing process of squirrel cage rotors of asynchronous motors.

[0083] Since the rotor core assembly has already formed an integral body before being installed into the motor shaft, the rotor core has good overall structural properties and high structural strength. In addition, the inner hole of the rotor core assembly can be ground first, and then the motor shaft can be installed. This makes the assembly process of the rotor assembly simpler and more reasonable than the current method, with better effects and better dynamic balance of the rotor. The present application adopts the self-starting structure of the reluctance motor, while retaining the structure and performance of the permanent magnet assisted reluctance motor, and does not have slots on the outer circumference of the rotor, thus avoiding the disadvantage of large tooth-slot resonance of general self-starting reluctance motors.

[0084] The biggest feature of the present application in terms of motor principle is the self-starting reluctance motor with a semi-auxiliary magnetic hybrid excitation structure, which has a completely different excitation method compared to the existing non-auxiliary magnetic reluctance motor and full-auxiliary magnetic reluctance motor. Structurally, the output characteristics of the motor can be easily adjusted and changed through different combinations of permanent magnets and non-magnetic conductors under the condition that the rotor punching structure remains unchanged, so as to adapt to different motor operating requirements. According to the existing rotor structure, the general change of motor operating conditions requires the redesign of the rotor punching, and the new rotor punching needs to be re-made with a new stamping die, which will extend the development cycle and increase development costs.

[0085] The motor provided by the present application is a semi-auxiliary magnetic hybrid excitation type reluctance motor, which still belongs to a permanent magnet assisted reluctance motor. It can be seen from the embodiments shown in the accompanying drawings that the technical solution of the present application can expand a variety of punching sheet design schemes, and through different filling methods, a variety of rotor schemes can be designed. The technical solution of the present application can reduce the risk of irreversible demagnetization of the permanent magnet assisted reluctance motor rotor, increase the self-starting (i.e. asynchronous starting) performance and out-of-step protection performance of the permanent magnet assisted reluctance motor, and the conductive bar structure formed by the non-magnetic conductor is very easy to realize whether it is cast or transferred into the rotor with processed parts.

[0086] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0087] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0088] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor structure of a self-starting hybrid excitation permanent magnet assisted reluctance motor, characterized in that: include: A rotor core (10), wherein a plurality of magnetic barrier slots are provided on the rotor core (10), a permanent magnet (20) is arranged in at least one of the plurality of magnetic barrier slots, and a non-magnetic conductor (30) is arranged in at least one of the remaining plurality of magnetic barrier slots; A plurality of magnetic barrier slots are arranged at intervals along the radial direction of the rotor core (10) to form a magnetic barrier slot group, and there are a plurality of magnetic barrier slot groups. The rotor core (10) is also provided with a plurality of through holes (14), and the plurality of through holes (14) are arranged at intervals along the outer edge of the rotor core (10). The plurality of through holes (14) are arranged in a one-to-one correspondence with the plurality of magnetic barrier slot groups, and the through holes (14) are used to fill the permanent magnets (20) and the non-magnetic conductors (30); Each of the magnetic barrier groove groups includes at least two layers of the magnetic barrier grooves.

2. The rotor structure according to claim 1, characterized in that: A plurality of the magnetic barrier slot groups are arranged at intervals along the circumferential direction of the rotor core (10), and the permanent magnet (20) and the non-magnetic conductor (30) are arranged in at least one of the plurality of magnetic barrier slot groups.

3. The rotor structure according to claim 2, characterized in that: The magnetic barrier slot group comprises a first layer of magnetic barrier slots (11) and a second layer of magnetic barrier slots (12); the first layer of magnetic barrier slots (11) is arranged close to one side of the shaft hole (13) of the rotor core (10); the second layer of magnetic barrier slots (12) is located outside the first layer of magnetic barrier slots (11); one of the first layer of magnetic barrier slots (11) and the second layer of magnetic barrier slots (12) is provided with the permanent magnet (20); and the other of the first layer of magnetic barrier slots (11) and the second layer of magnetic barrier slots (12) is provided with the non-magnetic conductor (30).

4. The rotor structure according to any one of claims 1 to 3, characterized in that: In each of the magnetic barrier slot groups, the magnetic barrier slot on the side close to the shaft hole (13) of the rotor core (10) is formed by at least two component segments, and a magnetic isolation bridge (15) is provided between two adjacent component segments.

5. The rotor structure according to claim 4, characterized in that: The cross section of the magnetic barrier groove is in a straight line or an arc shape.

6. The rotor structure according to claim 3, characterized in that: The first layer of magnetic barrier grooves (11) comprises a first component segment (111) and a second component segment (112), and a magnetic isolation bridge (15) is provided between the first component segment (111) and the second component segment (112).

7. The rotor structure according to claim 1, characterized in that: The non-magnetic conductor (30) is made of copper or aluminum.

8. The rotor structure according to claim 1, characterized in that: The rotor structure further comprises: An end baffle (40), wherein there are two end baffles (40), the two end baffles (40) are respectively arranged at two ends of the rotor core (10) and connected to the non-magnetic conductor (30), wherein the rotor core (10) comprises a plurality of core punchings, and the plurality of core punchings are compressed by the end baffles (40) to form the rotor core (10).

9. The rotor structure according to claim 1, characterized in that: The number of poles of the rotor structure is P, where P=2N, and N is a positive integer greater than or equal to 1.

10. The rotor structure according to claim 2, characterized in that: The cross-section of the through hole (14) is at least one of a polygonal, circular, and elliptical shape.

11. The rotor structure according to claim 2, characterized in that: The through holes (14) are arranged symmetrically with respect to the cross axis of the rotor core (10).

12. The rotor structure according to claim 2, characterized in that: Each of the magnetic barrier groove groups comprises a plurality of layers of magnetic barrier grooves, the cross-sections of the plurality of layers of magnetic barrier grooves are all in a straight line shape, at least two layers of the magnetic barrier grooves in the plurality of layers of magnetic barrier grooves comprise a plurality of component segments, and at least one of the plurality of component segments is used to arrange a permanent magnet (20) or the non-magnetic conductor (30).

13. The rotor structure according to claim 8, characterized in that: The material of the end baffle (40) is the same as the material of the non-magnetic conductor (30).

14. A self-starting hybrid excitation permanent magnet assisted reluctance motor, comprising a rotor structure, characterized in that: The rotor structure is the rotor structure according to any one of claims 1 to 13.

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