WO2020253192A1 - Asynchronous starting synchronous reluctance motor rotor structure, motor and compressor - Google Patents

Abstract

The present application provides an asynchronous starting synchronous reluctance motor rotor structure, a motor and a compressor. The asynchronous starting synchronous reluctance motor rotor structure comprises: a rotor iron core, a first type of slit grooves and a second type of slit grooves being provided on the rotor iron core, the first type of slit grooves and the second type of slit grooves being arranged alternately along a q-axis direction of the rotor iron core, filling slit grooves being respectively provided on two ends of the first type of slit grooves, and the second type of slit grooves being air grooves. The first type of slit grooves and the second type of slit grooves are provided, filling slit grooves are provided on two ends of the first type of slit grooves, and the second type of slit grooves are provided as air grooves. Such arrangements can effectively improve the efficiency of a motor having this rotor structure, and at the same time, adopting said rotor structure can avoid occurrence of serious deformation during manufacturing, and can also reduce the amount of material used for manufacturing the rotor structure, thereby effectively reducing the production cost of the motor.

Description

Asynchronous start synchronous reluctance motor rotor structure, motor and compressor Technical field

The present application relates to the technical field of compressor equipment, and in particular to an asynchronous starting synchronous reluctance motor rotor structure, motor and compressor. This application claims the priority of the patent application filed to the State Intellectual Property Office of China on June 19, 2019 with the application number 201910532908.X and the invention title "Asynchronous start synchronous reluctance motor rotor structure, motor and compressor".

Background technique

Asynchronous start synchronous reluctance motor combines the structural characteristics of induction motor and synchronous reluctance motor. The start is realized by generating torque by squirrel cage induction, and the multi-layer reluctance slot is set on the rotor to generate reluctance torque to achieve constant speed operation. It can be asynchronous Connect the power supply to realize the start operation. Compared with permanent magnet motors, asynchronous start synchronous reluctance motors have no rare earth permanent magnet materials and no demagnetization problems. The motor has low cost and good reliability. Moreover, there are many air magnetic barriers on the motor rotor, which has good heat dissipation effect and low rotor loss. Compared with asynchronous motors, it has high efficiency and constant speed.

In addition, the starting process of a direct-start synchronous reluctance motor includes two parts. One part is the squirrel cage formed by the ring guide bars at the outer end of the rotor. The asynchronous torque generated by the squirrel cage makes the motor start. The other part is that when the speed is close to the synchronous speed, the asynchronous torque and the reluctance torque are brought into synchronization, that is, the synchronous ability. Since the synchronization capability of a direct-start synchronous reluctance motor is related to the rotor inertia of the motor, the smaller the rotor inertia, the easier the motor will be brought into synchronization.

In the prior art, the rotor end ring guide bars of the direct-start synchronous reluctance motor are all cast by high-pressure die-casting. The high-pressure casting will cause serious deformation of the rotor reluctance groove, and the die-casting material uses a lot of materials. The patent number US2975310A provides a synchronous induction motor rotor structure, which generates reluctance torque, and has a simple structure. However, the patented rotor slot is filled with aluminum, the amount of aluminum is relatively large, the motor cost is high, and the end rings at both ends of the rotor cover On the entire rotor surface, there are no air circulation holes (magnetic barrier air slots) on the rotor, and the motor has poor heat dissipation performance.

Summary of the invention

The main purpose of this application is to provide an asynchronous start synchronous reluctance motor rotor structure, motor and compressor to solve the problem of low motor efficiency in the prior art.

In order to achieve the above objective, according to one aspect of the present application, a rotor structure of an asynchronous start synchronous reluctance motor is provided, which includes a rotor core, and the rotor core is provided with a first type of slit slot and a second type of slit slot , The first type of slit grooves and the second type of slit grooves are staggered along the q-axis direction of the rotor core, wherein the two ends of the first type of slit groove are respectively provided with a filling slit groove, the second type of slit The slot is an air slot.

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

Further, a reinforcing rib is provided in the middle of the second type of slit groove, 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 is an air slot, and the filling slot is used for inserting or injecting conductive and non-magnetic materials.

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

Further, the rotor structure of the asynchronous start synchronous reluctance motor further includes: a conductive end ring, there are 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 The surface is provided with slots corresponding to the independent filling slot and the filling slit slot; there are a plurality of guide bars, and the plurality of guide bars are inserted through the slots of the conductive end ring at the first end of the rotor core The slot of the conductive end ring is arranged in the independent filling groove and the filling slit groove and extends to the second end of the rotor core to form a squirrel cage.

Further, the length of the filling slot is gradually reduced in the direction close to the q axis.

According to another aspect of the present application, there is provided a method for manufacturing a rotor of an asynchronously-started synchronous reluctance motor. The method is used to manufacture the above-mentioned asynchronously-started synchronous reluctance motor rotor structure. The method includes the following steps: The rotor core is formed; the guide bar is inserted into the filling slit slot and the independent filling slot of the rotor core; the conductive end rings are respectively arranged at both ends of the rotor core, and the guide bar is inserted into the slot of the conductive end ring Inside; the conductive end ring and the rotor core are pressed tightly, and the guide bar and the conductive end ring are welded to form a squirrel cage.

According to another aspect of the present application, a motor is provided, including an asynchronous start synchronous reluctance motor rotor structure, and the asynchronous start synchronous reluctance motor rotor structure is the aforementioned asynchronous start synchronous reluctance motor rotor structure.

According to another aspect of the present application, there is provided a compressor including an asynchronous start synchronous reluctance motor rotor structure, and the asynchronous start synchronous reluctance motor rotor structure is the aforementioned asynchronous start synchronous reluctance motor rotor structure.

Applying the technical solution of the present application, the rotor structure is adopted, by setting the first type of slit grooves and the second type of slit grooves, and setting the filling slit grooves at both ends of the first type of slit grooves, and the second type The slit groove is provided as an air groove. 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 manufacturing, and can also reduce the amount of materials used for manufacturing the rotor structure, effectively reducing the production cost of the motor.

Description of the drawings

The drawings of the specification forming a part of the application are used to provide a further understanding of the application, and the exemplary embodiments and descriptions of the application are used to explain the application, and do not constitute an improper limitation of the application. In the attached picture:

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

Figure 2 shows a schematic structural diagram of an embodiment of a conductive end ring according to the present application;

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

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

Fig. 5 shows a flowchart of a method for manufacturing a rotor structure of an asynchronous start synchronous reluctance motor according to the present application.

The above drawings include the following reference signs:

10. Rotor core;

20. The first type of slit groove;

30. The second type of slit groove;

40. Fill the slit groove;

50. Reinforcing ribs;

61. Conductive end ring; 62. Slot; 63. Guide bar;

70. Independent filling tank.

Detailed ways

It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other if there is no conflict. Hereinafter, the present application will be described in detail with reference to the drawings and in conjunction with embodiments.

It should be noted that the terms used here 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 also be understood that when the terms "comprising" and/or "including" are used in this specification, they indicate There are features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first" and "second" in the description, claims and drawings of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the terms used in this way are interchangeable under appropriate circumstances, 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 variations of them 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 the clearly listed Those steps or units may include other steps or units that are not clearly listed or are inherent to these processes, methods, products, or equipment.

For ease of description, spatially relative terms such as "above", "above", "above", "above", etc. can be used here to describe as shown in the figure. Shows the spatial positional relationship between a device or feature and other devices or features. It should be understood that the spatially relative terms are intended to encompass different orientations in use or operation other than the orientation of the device described in the figure. For example, if the device in the figure is inverted, then the device described as "above the other device or structure" or "above the other device or structure" will then be positioned as "below the other device or structure" or "on Under other devices or structures". Thus, the exemplary term "above" can include both orientations "above" and "below". The device can also be positioned in other different ways (rotated by 90 degrees or in other orientations), and the relative description of the space used here is explained accordingly.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many different forms, and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of this application thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. In the drawings, for clarity, it may be enlarged. The thicknesses of layers and regions are shown, and the same reference numerals are used to denote the same devices, so their description will be omitted.

As shown in FIGS. 1 to 5, according to an embodiment of the present application, a rotor structure of an asynchronous start synchronous reluctance motor 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 groove 20 and a second type of slit groove 30. The first-type slit grooves 20 and the second-type slit grooves 30 are alternately arranged along the q-axis direction of the rotor core 10. Wherein, both ends of the first type of slit groove 20 are respectively provided with a filling slit groove 40, and the second type of slit groove 30 is an air groove.

In this embodiment, the rotor structure is adopted, the first type of slit grooves and the second type of slit grooves are provided, and filling slit grooves are provided at both ends of the first type of slit grooves, and the second type of slit The slot is set 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 manufacturing, and can also reduce the amount of materials used to manufacture the rotor structure, effectively reducing the production cost of the motor.

There are multiple first-type slit grooves 20, multiple second-type slit grooves 30, multiple first-type slit grooves 20 and multiple second-type slit grooves 30 are alternately arranged, and the second type The slit groove 30 is arranged between two adjacent first-type slit grooves 20. Among them, the first type of slit grooves 20 and the second type of slit grooves 30 are both arc-shaped structures and are bent at a side away from the shaft hole of the rotor core. The first type of slit groove 20 and both ends are respectively provided with a filling slit groove 40 and the second type of slit groove 30, which are combined into a magnetic barrier layer to 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 groove 30. The geometric center line of the rib 50 along 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 filling slot 40 is used to insert or inject conductive and non-magnetic materials. Among them, the method of inserting conductive and non-magnetic materials can effectively reduce the deformation of the rotor structure during manufacture, and improve the quality assurance of the rotor structure.

Furthermore, an independent filling groove 70 is also provided on the rotor core 10. The independent filling slot 70 is arranged close to the outer edge of the rotor core 10 and located at the q axis. This arrangement can effectively increase the magnetic flux difference 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 start. As shown in Figure 1, the rotor's q-axis and d-axis are arranged at an angle of 45°, with a total of four magnetic poles.

As shown in FIGS. 2 and 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 provided at the first end and the second end of the rotor core 10, and the outer circumferential surface of the conductive end ring 61 is provided with an independent filling groove 70 and a filling slit groove. 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 groove 70 and the filling slit groove 40 through the slot 62 of the conductive end ring 61 at the first end of the rotor core 10 and extend to the rotor iron. The conductive end ring 61 at the second end of the core 10 is in the slot 62 to form a squirrel cage. During the motor starting process, the squirrel cage induces a current, which interacts with the stator magnetic field to generate asynchronous torque to start the motor. Wherein, the length of the filling slot 40 is gradually reduced in the direction close to the q-axis.

According to another aspect of the present application, a method for manufacturing a rotor of an asynchronously-started synchronous reluctance motor is provided. The method is used for manufacturing the rotor structure of an asynchronously-started synchronous reluctance motor of the above-mentioned embodiment. The method includes the following steps: laminating the rotor blades to form the rotor core 10, inserting the guide bar 63 into the filling slit groove 40 and the independent filling groove 70 of the rotor core 10, respectively setting the conductive end rings 61 on the rotor iron The two ends of the core 10, and the guide bar 63 is inserted into the slot 62 of the conductive end ring 61, the conductive end ring 61 and the rotor core 10 are pressed tightly, and the guide bar 63 and the conductive end ring 61 are welded and connected to Form a squirrel cage. The rotor structure manufactured by the method has small rotor deformation, easy processing, convenient operation and saving production materials.

The rotor structure in the foregoing embodiment can also be used in the technical field of electrical equipment, that is, according to another aspect of the present application, a motor is provided. The motor includes an asynchronous starting 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 fields of equipment such as compressors and fans. That is, according to another aspect of the present application, 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 disadvantages of the rotor structure in the prior art. In addition, the synchronous reluctance motor rotor reduces the amount of material used to manufacture the rotor, reduces the cost of the motor, and at the same time 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 manufacturing, and improve the manufacturing quality.

The rotor punching piece is provided with a plurality of slit slots, which are arranged in layers in the radial direction to form a magnetic barrier layer. The magnetic barrier layer is arranged in at least two layers in the radial direction of the rotor. The slit slots are divided into air slots. Slots and filling slots. Filling slots need to be filled with conductive and non-magnetic materials such as aluminum. Filling slots are distributed on the outer circumference of the rotor and at both ends of the air slot, and the slot is filled under one pole. Interval configuration, as shown at A in Figure 1. The rotor with this structure can reduce the filling slot, can reduce the amount of filling material, reduce the cost, can also reduce the number of stiffeners, reduce the magnetic flux leakage, and improve the efficiency of the motor. Among them, the guide bar is made of aluminum, and the structural shape is consistent with the corresponding filling slit groove. It is inserted into the filling slit groove of the rotor by inserting, 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 cores with a specific structure and conductive end rings and guide bars at both ends of the rotor core. The rotor cores are provided with a plurality of slit slots (the first type of slit slots and the first type). The second type of slit grooves), filling slit grooves and shaft holes matching the shaft. The filling slit grooves are distributed on the outer circumference of the rotor at both ends of the air slit groove, and the filling slit grooves at both ends of the air slit groove under one pole are arranged at intervals, and the slit grooves are arranged in layers in the radial direction to form a magnetic field. Barrier layer, 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 q-axis of the motor, and generates reluctance torque to make the motor run. The slot of the first type and the filling slot of the corresponding two ends are divided by two reinforcing ribs, which are independent of each other. The reinforcing ribs ensure the structural strength of the rotor. The magnetic barrier layer composed of the second type of slit grooves has only one rib partition, which can reduce the number of ribs, reduce magnetic flux leakage, and improve motor efficiency.

Filling the slit slots requires filling or inserting conductive and non-magnetic materials such as aluminum. When the motor starts, it can induce current and interact with the stator to generate asynchronous torque to help the motor start. The first type of slot, the second type of slot The inside is air, which can increase the circulation area of the rotor and achieve the heat dissipation effect.

The guide bar is inserted into the opposite filling slit on the rotor. The conductive end ring is arranged at both ends of the rotor core. The conductive end ring is provided with a guide bar slot. As shown in Figure 2, the shape of the slot is consistent with the corresponding guide bar. The bar can be inserted into the corresponding slot. The structure 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 conductive bar are connected by welding, etc., through the conductive end The ring short-circuits all the guide 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 generate asynchronous torque to help the motor start. Wherein, the method for manufacturing the rotor of the asynchronous synchronous moving reluctance motor includes: a rotor core formed by laminating rotor punching sheets with a specific structure, and a conductive end ring and a conductive bar composed of conductive and non-magnetic materials. The bar is inserted into the corresponding filling slit slot on the rotor core, and the length of the guide bar is greater than the length of the core. The guide bar can be extended from both ends of the core, and then the conductive end ring is placed at both ends of the rotor. The guide bar is inserted correspondingly, and finally the core and end ring are compressed, and the guide bar and end ring are welded by welding, and finally the rotor is manufactured into a whole. The axial view of the rotor is shown in Figure 4, and Figure 5 is the process flow of the rotor manufacturing method. .

In addition to the above, it should be noted that the "one embodiment", "another embodiment", "embodiment", etc. referred to in this specification refer to specific features, structures, or features described in conjunction with the embodiment. The features are included in at least one embodiment generally described in this application. The occurrence of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when describing a specific feature, structure or characteristic in combination with any embodiment, what is claimed is that the combination of other embodiments to realize such a feature, structure or characteristic also falls within the scope of the present application.

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

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

Claims (10)

A rotor structure of an asynchronous start synchronous reluctance motor, which is characterized in that it comprises: A rotor core (10), the rotor core (10) is provided with a first type of slot (20) and a second type of slot (30), the first type of slot (20) and The second type of slit grooves (30) are staggered along the q-axis direction of the rotor core (10), wherein two ends of the first type of slit grooves (20) are respectively provided with a filling slit The slot (40), the second type of slot (30) is an air slot. The rotor structure of an asynchronous start synchronous reluctance motor according to claim 1, characterized in that there are multiple first-type slit slots (20), and multiple second-type slit slots (30), A plurality of the first type slit grooves (20) and a plurality of the second type slit grooves (30) are alternately arranged, and the second type slit grooves (30) are arranged at two adjacent Between the first type of slit grooves (20). The rotor structure of the asynchronous-start synchronous reluctance motor according to claim 1 or 2, characterized in that a reinforcing rib (50) is provided in the middle of the second type of slot (30), and the reinforcing rib (50) The geometric center line along the radial direction of the rotor core (10) coincides with the q axis. The rotor structure of an asynchronous start synchronous reluctance motor according to claim 1, wherein the first type of slot (20) is an air slot, and the filling slot (40) is used to insert or inject conductive Non-magnetic material. The rotor structure of an asynchronous start synchronous reluctance motor according to claim 1, wherein the rotor core (10) is further provided with an independent filling slot (70), and the independent filling slot (70) is close to the The outer edge of the rotor core (10) is arranged and located at the q axis. The rotor structure of an asynchronous start synchronous reluctance motor according to claim 5, wherein the rotor structure of the asynchronous start synchronous reluctance motor further comprises: 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 The outer peripheral surface of the conductive end ring (61) is provided with slots (62) corresponding to the independent filling groove (70) and the filling slit groove (40) one-to-one; The guide bar (63), the guide bar (63) is multiple, the plurality of the guide bars (63) pass through the conductive end ring (61) from the first end of the rotor core (10) The slot (62) is inserted into the independent filling groove (70) and the filling slit groove (40) and extends to the conductive end ring (61) of the second end of the rotor core (10) Inside the slot (62) to form a squirrel cage. The rotor structure of the asynchronous-start synchronous reluctance motor according to claim 1, wherein the length of the filling slot (40) is gradually reduced in a direction close to the q-axis. A method for manufacturing an asynchronously-started synchronous reluctance motor rotor, the method is used to manufacture the asynchronously-started synchronous reluctance motor rotor structure according to any one of claims 1 to 7, characterized in that the method includes the following step: Laminating the rotor punching sheets to form the rotor core (10); Insert the guide bar (63) into the filling slit groove (40) and the independent filling groove (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 tightly, and the guide bar (63) and the conductive end ring (61) are welded and connected to form a squirrel cage. A motor comprising an asynchronous start synchronous reluctance motor rotor structure, characterized in that the asynchronous start synchronous reluctance motor rotor structure is the asynchronous start synchronous reluctance motor rotor structure according to any one of claims 1 to 7. A compressor comprising an asynchronous start synchronous reluctance motor rotor structure, characterized in that the asynchronous start synchronous reluctance motor rotor structure is the asynchronous start synchronous reluctance motor rotor structure according to any one of claims 1 to 7 .

Images