CN110138115B - Asynchronous start synchronous reluctance motor rotor structure, motor and compressor - Google Patents

Abstract

The invention provides an asynchronous starting synchronous reluctance motor rotor structure, a motor and a compressor. The rotor structure of the asynchronous starting synchronous reluctance motor comprises: the rotor core is provided with a first type of slit grooves and a second type of slit grooves, the first type of slit grooves and the second type of slit grooves are arranged in a staggered mode along the q-axis direction of the rotor core, two ends of the first type of slit grooves are respectively provided with a filling slit groove, and the second type of slit grooves are air grooves. The first kind of slit groove and the second kind of slit groove are arranged, the filling slit groove is arranged at two ends of the first kind of slit groove, and the second kind of slit groove is arranged as the air groove. The motor efficiency with the rotor structure can be effectively improved by the arrangement, the rotor structure can be prevented from being seriously deformed during manufacturing, the material consumption for manufacturing the rotor structure can be reduced, and the production cost of the motor is effectively reduced.

Description

Asynchronous start synchronous reluctance motor rotor structure, motor and compressor

technical field

The invention relates to the technical field of compressor equipment, in particular, to an asynchronous start synchronous reluctance motor rotor structure, a motor and a compressor.

Background technique

The asynchronous starting synchronous reluctance motor combines the structural characteristics of the induction motor and the synchronous reluctance motor. The torque is generated by the squirrel cage induction to realize the starting. The multi-layer reluctance slot is arranged on the rotor to generate the reluctance torque to realize the constant speed operation, which can be asynchronous. Turn on the power to realize start-up operation. Compared with the permanent magnet motor, the asynchronous start synchronous reluctance motor has no rare earth permanent magnet material and no demagnetization problem. The motor has low cost and good reliability. Moreover, there are many air magnetic barriers on the rotor of the motor, the heat dissipation effect is good, and the rotor loss is small. Compared with asynchronous motors, it has high efficiency and constant speed.

In addition, the starting process of direct starting synchronous reluctance motor includes two parts, one part is that the rotor peripheral end ring bar forms a squirrel cage, and the asynchronous torque generated by the squirrel cage makes the motor start. The other part is the asynchronous torque and the reluctance torque pulled into the synchronization when the speed is close to the synchronous speed, that is, the synchronous ability. Since the synchronizing ability of the direct-start synchronous reluctance motor is related to the rotor inertia of the motor, the smaller the rotor inertia is, the easier the motor is to be pulled into synchronization.

In the prior art, the rotor end ring bars of the direct-start synchronous reluctance motor are all casted by high pressure die casting. High pressure casting will seriously deform the rotor reluctance groove, and the die casting material is much used. The patent No. US2975310A provides a rotor structure of a synchronous induction motor, which generates reluctance torque and has a simple structure. However, all aluminum is injected into the rotor slot of this patent. The amount of aluminum is relatively large, and the cost of the motor is high. On the entire rotor surface, there are no air circulation holes (magnetic barrier air slots) on the rotor, and the heat dissipation performance of the motor is poor.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide an asynchronous starting synchronous reluctance motor rotor structure, a motor and a compressor, so as to solve the problem of low motor efficiency in the prior art.

In order to achieve the above object, according to an aspect of the present invention, a rotor structure of an asynchronous start synchronous reluctance motor is provided, comprising: a rotor iron core, and the rotor iron core is provided with a first type of slot slot and a second type of slot slot , the first type of slot slot and the second type of slot slot are arranged staggered along the q-axis direction of the rotor core, wherein the two ends of the first type of slot slot are respectively provided with a filling slot slot, and the second type of slot slot is provided with a filling slot. The slot is an air slot.

Further, there are multiple slit slots of the first type, multiple slit slots of the second type, multiple slit slots of the first type and multiple slit slots of the second type are alternately arranged, and the slit slots of the second type are arranged alternately. It is arranged between two adjacent first-type slit grooves.

Further, a reinforcing rib is provided in the middle of the second type of slot slot, and the geometric center line of the reinforcing rib along the radial direction of the rotor core coincides with the q-axis.

Further, the first type of slot slot is an air slot, and the filled slot slot is used for inserting or injecting conductive and non-magnetic material.

Further, the rotor iron core is also provided with an independent filling slot, and the independent filling slot is arranged close to the outer edge of the rotor iron core and is located at the q-axis.

Further, the asynchronous start synchronous reluctance motor rotor structure also includes: conductive end rings, two conductive end rings, the two conductive end rings are arranged at the first end and the second end of the rotor core, and the outer circumference of the conductive end ring is The surface is provided with a one-to-one slot corresponding to the independent filling slot and the filling slit slot; the guide bars are multiple, and the multiple guide bars are inserted through the slots of the conductive end ring from the first end of the rotor core. A squirrel cage is formed in the slot of the conductive end ring that is provided in the separate fill slot and fill slot slot and extends to the second end of the rotor core.

Further, the length of the filling slit groove is set to be gradually reduced in the direction close to the q-axis.

According to another aspect of the present invention, there is provided a method for manufacturing a rotor of an asynchronously starting synchronous reluctance motor. The method is used to manufacture the above-mentioned asynchronous starting synchronous reluctance motor rotor structure, and the method includes the following steps: laminating the rotor sheets. forming the rotor core; inserting the guide bar into the filling slot and the independent filling slot of the rotor core; respectively setting the conductive end rings on both ends of the rotor core, and inserting the guide bar into the slot of the conductive end ring Inside; press the conductive end ring and the rotor core tightly, and weld the conductor bar and the conductive end ring to form a squirrel cage.

According to another aspect of the present invention, a motor is provided, comprising an asynchronously starting synchronous reluctance motor rotor structure, and the asynchronously starting synchronous reluctance motor rotor structure is the above-mentioned asynchronous starting synchronous reluctance motor rotor structure.

According to another aspect of the present invention, a compressor is provided, comprising an asynchronously starting synchronous reluctance motor rotor structure, and the asynchronously starting synchronous reluctance motor rotor structure is the above-mentioned asynchronous starting synchronous reluctance motor rotor structure.

Applying the technical solution of the present invention, adopting the rotor structure, by setting the first type of slit slot and the second type of slot slot, and setting filling slot slots at both ends of the first type of slot slot, while the second type of slot slot is The slit slot is provided as an air slot. This arrangement can effectively improve the efficiency of the motor with the rotor structure, and at the same time, the use of the rotor structure can avoid serious deformation during manufacture, and can also reduce the amount of materials used to manufacture the rotor structure, effectively reducing the production cost of the motor.

Description of drawings

The accompanying drawings forming a part of the present application are used to provide further understanding of the present invention, and 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 attached image:

FIG. 1 shows a schematic structural diagram of the first embodiment of the rotor structure of the asynchronous start synchronous reluctance motor according to the present invention;

FIG. 2 shows a schematic structural diagram of an embodiment of a conductive end ring according to the present invention;

3 shows a schematic structural diagram of the second embodiment of the rotor structure of the asynchronous start synchronous reluctance motor according to the present invention;

FIG. 4 shows a schematic structural diagram of the third embodiment of the rotor structure of the asynchronous start synchronous reluctance motor according to the present invention;

FIG. 5 shows a flow chart of a method for manufacturing a rotor structure of an asynchronous start synchronous reluctance motor according to the present invention.

Wherein, the above-mentioned drawings include the following reference signs:

10. Rotor core;

20. The first type of slit slot;

30. The second type of slit slot;

40. Fill the slit slot;

50. Reinforcing ribs;

61, conductive end ring; 62, slot; 63, guide bar;

70. Independent filling slot.

Detailed ways

It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

It should be noted that the terms "first", "second" and the like in the description and claims of the present application and the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein can, for example, be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under other devices or constructions". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those of ordinary skill in the art, and in the accompanying drawings, which may be exaggerated for the sake of clarity The thicknesses of layers and regions are described, and the same reference numerals are used to denote the same devices, and thus their descriptions will be omitted.

1 to 5, according to an embodiment of the present invention, an asynchronous start synchronous reluctance motor rotor structure is provided.

Specifically, as shown in FIG. 1 , the rotor structure of the asynchronous start synchronous reluctance motor includes a rotor core 10 . The rotor core 10 is provided with a first type of slit slot 20 and a second type of slot slot 30 . The first type of slit grooves 20 and the second type of slit grooves 30 are alternately provided along the q-axis direction of the rotor core 10 . Wherein, the two ends of the first type of slit slot 20 are respectively provided with a filling slot 40, and the second type of slot slot 30 is an air slot.

In this embodiment, using the rotor structure, by setting the first type of slit grooves and the second type of slit grooves, and providing filling slit grooves at both ends of the first type of slit grooves, the second type of slit grooves are simultaneously The slot is provided as an air slot. This arrangement can improve the efficiency of the motor with the rotor structure, and at the same time, the use of the rotor structure can avoid serious deformation during manufacture, and can also reduce the amount of materials used to manufacture the rotor structure, effectively reducing the production cost of the motor.

Wherein, there are a plurality of first type slit slots 20, a plurality of second type slot slots 30, a plurality of first type slot slots 20 and a plurality of second type slot slots 30 are arranged alternately, and the second type slot slots 30 are arranged alternately. The slit grooves 30 are disposed between two adjacent first-type slit grooves 20 . Wherein, the first type of slot slot 20 and the second type of slot slot 30 are both arc-shaped structures and are bent on the side away from the shaft hole of the rotor core. The first type of slot 20 and two ends are respectively provided with a filled slot 40 and the second type of slot 30, which are combined to form a magnetic barrier layer, form a salient pole difference, and generate a reluctance torque.

A reinforcing rib 50 is provided in the middle of the second type of slit slot 30 . The geometric center line of the rib 50 in the radial direction of the rotor core 10 coincides with the q-axis. This arrangement can effectively improve the stability and reliability of the rotor structure.

The first type of slot 20 is an air slot, and the filled slot 40 is used for inserting or injecting conductive and non-magnetic materials. The method of inserting conductive and non-magnetic conductive materials can effectively reduce the deformation of the rotor structure during manufacture, and improve the quality assurance of the rotor structure.

Further, the rotor core 10 is also provided with an independent filling groove 70 . The separate filling slot 70 is provided near the outer edge of the rotor core 10 and is located at the q-axis. This arrangement can effectively increase the difference between the magnetic fluxes between the q-axis and the d-axis of the rotor structure, further improve the performance of the rotor structure, and at the same time help the motor to start. As shown in FIG. 1 , the q-axis and the d-axis of the rotor are arranged at an angle of 45°, with a total of four magnetic poles.

As shown in FIG. 2 and FIG. 3 , the rotor structure of the asynchronous start synchronous reluctance motor further includes a conductive end ring 61 and a guide bar 63 . There are two conductive end rings 61 , the two conductive end rings 61 are disposed at the first end and the second end of the rotor core 10 , and the outer peripheral surface of the conductive end rings 61 is provided with independent filling grooves 70 and filling slit grooves 40 one-to-one corresponding slot 62. There are a plurality of guide bars 63, and the plurality of guide bars 63 are inserted into the independent filling grooves 70 and the filling slit grooves 40 through the slots 62 of the conductive end ring 61 from the first end of the rotor iron core 10 and extend to the rotor iron The second end of the core 10 is placed in the slot 62 of the conductive end ring 61 to form a squirrel cage. During the starting process of the motor, the squirrel cage induces a current, which interacts with the stator magnetic field to generate asynchronous torque to start the motor. Here, the length of the filling slit groove 40 is gradually reduced in the direction close to the q-axis.

According to another aspect of the present invention, a method for manufacturing a rotor of an asynchronous start synchronous reluctance motor is provided, and the method is used to manufacture the asynchronous start synchronous reluctance motor rotor structure of the above embodiment. The method includes the following steps: laminating the rotor punching sheets to form the rotor iron core 10 , inserting the guide bars 63 into the filling slot 40 and the independent filling groove 70 of the rotor iron core 10 , and disposing the conductive end rings 61 on the rotor iron respectively. the two ends of the core 10, insert the guide bar 63 into the slot 62 of the conductive end ring 61, press the conductive end ring 61 and the rotor core 10 tightly, and weld the guide bar 63 and the conductive end ring 61 to connect to Form a rat cage. The rotor structure manufactured by the method has the advantages of small rotor deformation, easy processing, convenient operation and saving of production materials.

The rotor structure in the above-mentioned embodiments can also be used in the technical field of electrical machinery, that is, according to another aspect of the present invention, a motor is provided. The motor includes an asynchronous start synchronous reluctance motor rotor structure. The rotor structure of the asynchronous start synchronous reluctance motor is the rotor structure of the asynchronous start synchronous reluctance motor in the above embodiment.

The rotor structure in the above embodiment can also be used in the technical field of equipment such as compressors and fans, that is, according to another aspect of the present invention, a compressor is provided. The compressor includes an asynchronous start synchronous reluctance motor rotor structure, and the asynchronous start synchronous reluctance motor rotor structure is the asynchronous start synchronous reluctance motor rotor structure in the above embodiment.

Specifically, the use of the synchronous reluctance motor rotor can overcome the shortcomings of the rotor structure in the prior art. In addition, the rotor of the synchronous reluctance motor reduces the amount of materials for manufacturing the rotor, reduces the cost of the motor, reduces the magnetic flux leakage of the rotor, and improves the efficiency of the motor. The method of inserting conductive and non-magnetic materials is adopted to avoid serious deformation of the rotor during manufacture and improve the manufacturing quality.

The rotor punching piece is provided with a plurality of slit slots. The slit slots are arranged in layers in the radial direction to form a magnetic barrier layer. The magnetic barrier layer is arranged at least two layers in the radial direction of the rotor. The slit slots are divided into air slits. Slot and filling slot, filling slot needs to be filled with conductive and non-magnetic materials such as aluminum, filling slot is distributed on the outer circumference of the rotor and located at both ends of the air slot, and the slot is filled under one pole Spaced configuration, as shown at A in Figure 1. By adopting the rotor of this structure, the filling slot is reduced, the amount of filling material can be reduced, the cost can be reduced, the number of reinforcing ribs can also be reduced, the magnetic flux leakage can be reduced, and the motor efficiency can be improved. Among them, the guide bar is made of aluminum bar, and the structure shape is consistent with the corresponding filling slot slot, and it is inserted into the rotor filling slot slot by means of insertion, instead of using pressure-cast aluminum, to avoid serious deformation of the rotor.

The rotor is composed of a rotor core formed by laminating rotor punching sheets with a specific structure, and conductive end rings and guide bars at both ends of the rotor core. Type II slot), filling the slot and the shaft hole matched with the rotating shaft. The filling slits are distributed on the outer circumference of the rotor and are located at both ends of the air slits, and the filling slits located at both ends of the air slits under one pole are arranged at intervals, and the slits are arranged in layers in the radial direction to form a magnetic The magnetic barrier layer is arranged at least two layers in the radial direction of the rotor. The magnetic barrier layer increases the inductance gap between the d-axis and the q-axis of the motor, generates reluctance torque, and makes the motor run. The first type of slot slot and the filled slot slot at the corresponding two ends are divided by two reinforcing ribs, which are independent of each other. Reinforcing ribs ensure the structural strength of the rotor. The magnetic barrier layer composed of the second type of slot and slot is divided by only one reinforcing rib, which can reduce the number of reinforcing ribs, reduce magnetic flux leakage, and improve the efficiency of the motor.

To fill the slot, it is necessary to fill or insert conductive and non-magnetic materials such as aluminum. When the motor starts, it can induce a current and generate asynchronous torque with the stator to help the motor start. The first type of slot slot and the second type of slot slot The inside is air, which can increase the rotor circulation area and achieve the heat dissipation effect.

The guide bars are inserted into the opposite filling slits on the rotor, the conductive end rings are arranged on both ends of the rotor core, and the guide bar slots are arranged on the conductive end rings. As shown in Figure 2, the shape of the slot is the same as that of the corresponding The bar can be inserted into the corresponding slot, the structure shape of the bar is consistent with the corresponding filling slot, insert the bar into the corresponding filling slot on the rotor core, the conductive end ring and the bar are connected by welding, etc., through the conductive end The ring short-circuits all the bars to form a squirrel cage, as shown in Figure 3, which is a three-dimensional exploded view of the rotor. When the motor starts, the squirrel cage and the stator act to generate asynchronous torque to help the motor start. Wherein, the method for manufacturing a rotor of an asynchronous start-up synchronous reluctance motor includes: a rotor iron core formed by laminating rotor sheets with a specific structure, and a conductive end ring and a guide bar composed of conductive and non-magnetic materials. The bar is inserted into the corresponding filling slot on the rotor iron core, and the length of the bar is longer than the length of the iron core. The guide bar is inserted correspondingly, and finally the iron core and the end ring are pressed, and the guide bar and the end ring are welded by welding, and finally the rotor is manufactured to form a whole. The axial view of the rotor is shown in Figure 4, and Figure 5 is the flow of the rotor manufacturing method .

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 Features are included in at least one embodiment generally described in this application. The appearances of the same expression in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure or characteristic is described in conjunction with any one embodiment, it is claimed that implementation of that feature, structure or characteristic in conjunction with other embodiments is also within the scope of the present invention.

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

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (8)

1. an asynchronous starting synchronous reluctance motor rotor structure, is characterized in that, comprises: A rotor iron core (10), the rotor iron core (10) is provided with a first type of slot slot (20) and a second type of slot slot (30), the first type of slot slot (20) and The second type of slot slots (30) are arranged staggered along the q-axis direction of the rotor core (10), wherein two ends of the first type of slot slot (20) are respectively provided with a filling slot a slot (40), the second type of slot (30) is an air slot; The rotor iron core (10) is further provided with an independent filling groove (70), and the independent filling groove (70) is arranged close to the outer edge of the rotor iron core (10) and is located at the q-axis; The rotor structure of the asynchronous start synchronous reluctance motor further includes: Conductive end rings (61), there are two conductive end rings (61), and the two conductive end rings (61) are arranged at the first end and the second end of the rotor core (10), so A slot (62) corresponding to the independent filling groove (70) and the filling slit groove (40) one-to-one is provided on the outer peripheral surface of the conductive end ring (61); Conductive bars (63), a plurality of the conductive bars (63), the plurality of the conductive bars (63) passing through the conductive end ring (61) from the first end of the rotor core (10) The slot (62) is inserted into the independent filling slot (70) and the filling slit slot (40) and extends to the conductive end ring (61) of the second end of the rotor core (10) into the slot (62) of the mouse to form a squirrel cage. 2 . The rotor structure of an asynchronous starting synchronous reluctance motor according to claim 1 , wherein the number of the first type of slit slots ( 20 ) is multiple, and the number of the second type of slot slots ( 30 ) is multiple. 3 . A plurality of the first type of slit grooves (20) and a plurality of the second type of slit grooves (30) are arranged alternately, and the second type of slit grooves (30) are arranged in adjacent two between the first type of slit grooves (20). 3. The asynchronous starting synchronous reluctance motor rotor structure according to claim 1 or 2, wherein a reinforcing rib (50) is provided in the middle of the second type of slit slot (30), and the reinforcing rib ( The geometric centerline of 50) along the radial direction of the rotor core (10) coincides with the q-axis. 4. The asynchronous starting synchronous reluctance motor rotor structure according to claim 1, wherein the first type of slot (20) is an air slot, and the filled slot (40) is used for inserting or Inject conductive and non-magnetic materials. 5. The rotor structure of the asynchronous starting synchronous reluctance motor according to claim 1, characterized in that, the length of the filling slot (40) is gradually reduced along the direction close to the q-axis. 6 . A method for manufacturing a rotor of an asynchronous starting synchronous reluctance motor, the method is used to manufacture the rotor structure of an asynchronous starting synchronous reluctance motor according to any one of claims 1 to 5, wherein the method is characterized in that Include the following steps: Laminating rotor punching sheets to form the rotor iron core (10); inserting the guide bar (63) into the filling slot (40) and the independent filling slot (70) of the rotor core (10); The conductive end rings (61) are respectively arranged on both ends of the rotor core (10), and the guide bars (63) are inserted into the slots (62) of the conductive end rings (61); The conductive end ring (61) and the rotor core (10) are pressed together, and the conductive bar (63) and the conductive end ring (61) are welded and connected to form a squirrel cage. 7. A motor comprising an asynchronous start synchronous reluctance motor rotor structure, wherein the asynchronous start synchronous reluctance motor rotor structure is the asynchronous start synchronous reluctance motor rotor according to any one of claims 1 to 6 structure. 8. A compressor, comprising an asynchronous start synchronous reluctance motor rotor structure, wherein the asynchronous start synchronous reluctance motor rotor structure is the asynchronous start synchronous reluctance motor according to any one of claims 1 to 5 Rotor structure.

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