Synchronous reluctance motor

Abstract

The utility model provides a synchronous reluctance motor, comprising a stator, the stator comprises a stator core and a plurality of stator windings, the plurality of stator windings are installed in stator slots of the stator core, and each stator winding is a distributed winding; the rotor is rotatably installed in the central cavity of the stator around a rotor shaft, the rotor comprises a rotor body and a plurality of salient poles, the salient poles are arranged on the side wall of the rotor body, the salient poles are arranged in a protruding mode in the radial direction of the rotor, and the salient poles are sequentially arranged in the circumferential direction of the rotor at intervals; the input rotating speed of the speed reducing mechanism is larger than the output rotating speed of the speed reducing mechanism, and the power input end of the speed reducing mechanism is connected with the rotor shaft. The synchronous reluctance motor provided by the utility model solves the technical problems that the rotor of the synchronous reluctance motor in the prior art is difficult to process and the output torque is low.

Description

Technical Field

[0001] The utility model relates to the field of electric motors, in particular to a synchronous reluctance motor. Background Art

[0002] The synchronous reluctance motor is a type of reluctance motor. The stator is a distributed winding stator structure of a conventional AC motor. The stator power supply is a sinusoidal AC power supply. The rotor structure is a winding-free structure made of stacked silicon steel sheets. The outer circle of the rotor is smooth and there are grooves in the rotor core. The grooves simulate the salient pole effect, thereby generating a driving torque with reluctance properties.

[0003] In the synchronous reluctance motor in the related art, the rotor is formed by stacking rotor sheets, and the inner side of the rotor sheets needs to be slotted, which has high processing costs and is difficult to operate. In addition, the synchronous reluctance motor in the related art has a weak salient pole effect due to the slotting on the inner side of the rotor, resulting in a low output torque of the motor.

[0004] Therefore, the synchronous reluctance motor in the related art has the technical problems of difficulty in rotor processing and low motor output torque. Currently, no effective solution has been proposed for this technical problem. Utility Model Content

[0005] The main purpose of the utility model is to provide a synchronous reluctance motor to solve the technical problems of difficult rotor processing and low output torque of the synchronous reluctance motor in the related art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a synchronous reluctance motor, comprising: a stator, the stator comprising a stator core and a plurality of stator windings, the plurality of stator windings being installed in stator slots of the stator core, wherein each stator winding is a distributed winding; a rotor, the rotor being rotatably installed in a central cavity of the stator around a rotor axis, the rotor comprising a rotor body and a plurality of salient poles, the salient poles being all arranged on the side walls of the rotor body, the salient poles being arranged along the radial protrusions of the rotor, and the plurality of salient poles being arranged in sequence and spaced apart along the circumference of the rotor; a reduction mechanism, the input speed of the reduction mechanism being greater than the output speed of the reduction mechanism, and the power input end of the reduction mechanism being connected to the rotor shaft.

[0007] Furthermore, the speed reduction mechanism is a speed reduction gear set.

[0008] Furthermore, the speed reduction mechanism is a planetary gear set.

[0009] Furthermore, the rotor and the rotor shaft are an integrated structure.

[0010] Furthermore, the synchronous reluctance motor also includes a casing and an inner cylinder. The casing cooperates with the inner cylinder to form a sealed cavity, and the stator is arranged in the sealed cavity.

[0011] Furthermore, the rotor is arranged inside the inner cylinder, and the thickness of a portion of the inner cylinder located between the stator and the rotor ranges from 2 mm to 8 mm.

[0012] Furthermore, the inner cylinder is made of stainless steel.

[0013] Furthermore, along the axial direction of the synchronous reluctance motor, the first end of the inner cylinder is sealed, and the synchronous reluctance motor also includes an end cover, which is connected to the second end of the inner cylinder, and an installation cavity is formed between the end cover and the inner cylinder, and the rotor and the reduction mechanism are installed in the installation cavity.

[0014] Furthermore, a mounting portion is provided on the end cover, so that the synchronous reluctance motor can be mounted at a working position through the mounting portion.

[0015] Further, the mounting portion is arranged around the rotor shaft along the circumference of the rotor shaft; and / or, the power output shaft of the reduction mechanism is arranged coaxially with the rotor shaft.

[0016] The synchronous reluctance motor using the technical solution of the utility model comprises: a stator, the stator comprises a stator core and a plurality of stator windings, the plurality of stator windings are installed in the stator slots of the stator core, wherein each stator winding is a distributed winding; a rotor, the rotor is rotatably installed in the central cavity of the stator around the rotor axis, the rotor comprises a rotor body and a plurality of salient poles, the salient poles are all arranged on the side wall of the rotor body, the salient poles are arranged along the radial protrusion of the rotor, and the plurality of salient poles are arranged in sequence along the circumferential direction of the rotor; a reduction mechanism, the input speed of the reduction mechanism is greater than the output speed of the reduction mechanism, and the power input end of the reduction mechanism is connected to the rotor shaft. In the synchronous reluctance motor adopting this structural design, the stator winding adopts a distributed winding, the stator is a sinusoidal magnetic field during operation, the control is relatively simple, the control technology is relatively mature, and the cost of the drive control system is relatively low. On this basis, the rotor comprises a rotor body and a plurality of salient poles arranged on its side wall. The rotor adopting this structural design has a protruding structure of salient poles, which is simple to process, and has a stronger salient pole effect and a larger magnetic resistance change rate, which is conducive to improving overload capacity and power density. However, the applicant has found that the synchronous reluctance motor in the related art can effectively reduce the torque pulsation and noise when the motor is running due to the smooth rotor surface and relatively continuous magnetic resistance change. After the rotor with a salient pole structure design is adopted, the rotor torque fluctuation will increase, and the low-speed operation effect of the motor will deteriorate. Therefore, the synchronous reluctance motor of the embodiment of the present application is designed with a deceleration mechanism, and the power input end of the deceleration mechanism is connected to the rotor shaft, so as to decelerate its speed, so that the output speed of the synchronous reluctance motor is reduced. By designing the deceleration mechanism, the motor body can achieve a lower speed output at its own higher speed, which is conducive to avoiding the torque fluctuation of the motor when it is running at a low speed, thereby improving its running stability and optimizing the low-speed operation effect of the motor. By adopting the above-mentioned structural design, a synchronous reluctance motor with a salient pole rotor structure design that runs smoothly at a low speed is provided, which solves the technical problems of difficult rotor processing and low output torque of the synchronous reluctance motor in the related art. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting 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 on the present invention. In the drawings:

[0018] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of a synchronous reluctance motor of the utility model at a first viewing angle;

[0019] Figure 2 for Figure 1 An enlarged schematic diagram of a part of the structure of the synchronous reluctance motor;

[0020] Figure 3It is a schematic cross-sectional structure diagram of an embodiment of a synchronous reluctance motor of the utility model at a second viewing angle;

[0021] Figure 4 It is a structural schematic diagram of a stator core of an embodiment of a synchronous reluctance motor of the utility model;

[0022] Figure 5 It is a schematic structural diagram of a rotor of an embodiment of a synchronous reluctance motor of the utility model.

[0023] The above drawings include the following reference numerals:

[0024] 1. stator; 11. stator core; 110. stator slot; 12. stator winding; 2. rotor; 20. rotor shaft; 21. rotor body; 22. salient pole; 3. reduction mechanism; 4. housing; 41. first sealing cover; 5. inner cylinder; 51. second sealing cover; 6. end cover; 61. mounting part. DETAILED DESCRIPTION

[0025] 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 utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Please refer to Figures 1 to 5 The embodiment of the utility model provides a synchronous reluctance motor, which includes: a stator 1, the stator 1 includes a stator core 11 and a plurality of stator windings 12, the plurality of stator windings 12 are installed in stator slots 110 of the stator core 11, wherein each stator winding 12 is a distributed winding; a rotor 2, the rotor 2 is rotatably installed in the central cavity of the stator 1 around a rotor shaft 20, the rotor 2 includes a rotor body 21 and a plurality of salient poles 22, the salient poles 22 are all arranged on the side wall of the rotor body 21, the salient poles 22 are arranged along the radial protrusion of the rotor 2, and the plurality of salient poles 22 are arranged in sequence along the circumferential direction of the rotor 2; a reduction mechanism 3, the input speed of the reduction mechanism 3 is greater than the output speed of the reduction mechanism 3, and the power input end of the reduction mechanism 3 is connected to the rotor shaft 20.

[0027] In the synchronous reluctance motor with this structural design, the stator winding 12 adopts a distributed winding, and the stator is a sinusoidal magnetic field during operation, which is relatively simple to control, the control technology is relatively mature, and the cost of the drive control system is low. On this basis, the rotor 2 includes a rotor body 21 and a plurality of salient poles 22 arranged on its side wall. The rotor 2 with this structural design has a salient pole 22 of a protruding structure, which is simple to process, and has a stronger salient pole effect and a larger magnetic resistance change rate, which is beneficial to improving the overload capacity and power density. However, the applicant found that the synchronous reluctance motor in the related art can effectively reduce the torque pulsation and noise during the operation of the motor due to the smooth rotor surface and the relatively continuous magnetic resistance change. After the rotor 2 with a salient pole structure design is adopted, the rotor torque fluctuation will increase, and the low-speed operation effect of the motor will deteriorate. Therefore, the synchronous reluctance motor of the embodiment of the present application is designed with a reduction mechanism 3, and the power input end of the reduction mechanism 3 is connected to the rotor shaft 20, so as to reduce its speed, so that the output speed of the synchronous reluctance motor is reduced. By designing the speed reduction mechanism 3, the motor body can achieve a lower speed output at its own higher speed, which is beneficial to avoid torque fluctuations when the motor runs at low speed, thereby improving its running stability and optimizing the low-speed running effect of the motor. By adopting the above-mentioned structural design, a synchronous reluctance motor with a salient pole rotor structure design that runs smoothly at low speed is provided, which solves the technical problems of difficult synchronous reluctance motor rotor processing and low output torque in related technologies.

[0028] The synchronous reluctance motor of the embodiment of the present application is particularly suitable for low-speed operation loads in harsh environments, such as high temperature, high pressure, harmful gases, corrosive environments, etc. The synchronous reluctance motor with a salient pole rotor structure operates relatively stably and is not prone to failure when used in such environments. In addition, motors used in harsh environments usually avoid redundant structural designs to reduce the risk of failure, so the reduction mechanism is usually not used. In the embodiment of the present application, the reduction mechanism is designed to reduce the output speed of the motor, so that the motor body can achieve a lower speed output at its own higher speed, which can avoid torque fluctuations when the motor is running at low speed, thereby improving its running stability.

[0029] In this embodiment, the speed reduction mechanism 3 is a speed reduction gear set. Preferably, the speed reduction mechanism 3 is a planetary gear set. By using a planetary gear set as the speed reduction mechanism 3 to reduce the output speed of the rotor shaft, not only can the space occupation of the speed reduction mechanism 3 be effectively reduced, the compactness of the synchronous reluctance motor structure be improved, and the volume of the synchronous reluctance motor can be better controlled, but also the planetary gear set can conveniently realize the coaxial output of power and improve the flexibility of power output.

[0030] In a preferred embodiment, the rotor 2 and the rotor shaft 20 are an integrated structure. The design of the integrated structure of the rotor 2 and the rotor shaft 20 uses an integral molding process, which reduces the seams and welding at the joints, thereby improving the overall structural strength and rigidity of the rotor 2, reducing the risk of deformation or fatigue damage of the rotor 2 during operation, and is conducive to ensuring the reliability of the structure of the rotor 2 and the rotor shaft 20, thereby ensuring the stability of the motor in harsh environments. Moreover, the integrated structure can adopt a one-time molding process during the manufacturing process, avoiding the complex process of multiple assembly and connection, reducing manufacturing costs, and improving production efficiency. In addition, the integrated structural design can also make the rotor 2 more integrated, tightly connected, and reasonably designed with an internal structure, which can effectively reduce the noise and vibration of the rotor during operation, thereby helping to improve the running stability of the motor.

[0031] Specifically, the synchronous reluctance motor further includes a casing 4 and an inner cylinder 5. The casing 4 cooperates with the inner cylinder 5 to form a sealed cavity, and the stator 1 is arranged in the sealed cavity.

[0032] By adopting this structural design, a sealed cavity is formed between the casing 4 and the inner cylinder 5, and the stator 1 is arranged in the sealed cavity. Therefore, the stator 1 can be well protected, especially when used in harsh environments such as high temperature, high pressure, and corrosion, the fragile stator part can be protected as little as possible, which is beneficial to improving the reliability of the motor and extending the service life of the motor.

[0033] Specifically, the rotor 2 is arranged inside the inner cylinder 5, and the thickness of the portion of the inner cylinder 5 between the stator 1 and the rotor 2 ranges from 2 mm to 8 mm. As described above, the stator 1 is arranged outside the inner cylinder 5, and the rotor 2 is arranged inside the inner cylinder 5, and the two are physically isolated by the inner cylinder 5, so that the stator 1 can be isolated from the harsh operating environment, thereby improving the reliability of the motor operation. In this process, the inner cylinder 5 mainly plays the role of sealing, supporting, and bearing pressure. In order to better realize these functions, the thickness of the portion of the inner cylinder 5 between the rotor 2 and the stator 1 is designed to be 2 mm to 8 mm in this embodiment.

[0034] It should be noted that the specific shape of the inner cylinder 5 is not limited here, as long as it can play the above-mentioned sealing, supporting, pressure-bearing and other functions, and separate the stator 1 and the rotor 2, and its shape is not required to be a strict cylindrical structure. In a preferred embodiment, the inner cylinder 5 is made of stainless steel.

[0035] Specifically, along the axial direction of the synchronous reluctance motor, the first end of the inner cylinder 5 is blocked, such as Figure 1 and Figure 2As shown, in one embodiment, the first end of the inner cylinder 5 is provided with a first opening, through which the internal rotor shaft 20 can be easily lubricated and other operations can be performed, and the synchronous reluctance motor also includes a second sealing cover 51, which seals the first opening. Figure 1 As shown, preferably, a second opening is provided at a position corresponding to the first opening of the housing 4, and the second sealing cover 51 and the first opening can be operated through the second opening. The synchronous reluctance motor also includes a first sealing cover 41, and the first sealing cover 41 blocks the second opening. By removing the first sealing cover 41 and the second sealing cover 51, the rotor shaft 20 or the bearing and other structures in the inner cylinder 5 can be operated, which facilitates the maintenance of the motor. The synchronous reluctance motor also includes an end cover 6, which is connected to the second end of the inner cylinder 5, and an installation cavity is formed between the end cover 6 and the inner cylinder 5, and the rotor 2 and the reduction mechanism 3 are installed in the installation cavity.

[0036] In this way, the rotor 2 and the speed reduction mechanism 3 are both installed in the installation cavity, so as to be better protected and can be isolated from the environment outside the motor to a certain extent, which is conducive to ensuring the smooth operation of the motor.

[0037] Specifically, a mounting portion 61 is provided on the end cover 6 , so that the synchronous reluctance motor can be mounted at a working position through the mounting portion 61 .

[0038] By designing the mounting portion 61, the motor can be directly mounted at the working position through the mounting portion 61 to achieve power output, making the motor installation and use more convenient. In actual implementation, the specific position and structure of the mounting portion 61 can be varied. In a possible implementation, the mounting portion 61 is a flange disposed on the end cover 6, and the motor can be connected to the working position through the flange.

[0039] Specifically, the mounting portion 61 is disposed around the rotor shaft 20 along the circumference of the rotor shaft 20 ; and / or, the power output shaft of the speed reduction mechanism 3 is disposed coaxially with the rotor shaft 20 .

[0040] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0041] The synchronous reluctance motor of the embodiment of the utility model comprises: a stator 1, the stator 1 comprises a stator core 11 and a plurality of stator windings 12, the plurality of stator windings 12 are installed in the stator slots 110 of the stator core 11, wherein each stator winding 12 is a distributed winding; a rotor 2, the rotor 2 is rotatably installed in the central cavity of the stator 1 around the rotor shaft 20, the rotor 2 comprises a rotor body 21 and a plurality of salient poles 22, the salient poles 22 are all arranged on the side wall of the rotor body 21, the salient poles 22 are arranged along the radial protrusion of the rotor 2, and the plurality of salient poles 22 are arranged in sequence along the circumferential direction of the rotor 2; a speed reduction mechanism 3, the input speed of the speed reduction mechanism 3 is greater than the output speed of the speed reduction mechanism 3, and the power input end of the speed reduction mechanism 3 is connected to the rotor shaft 20. In the synchronous reluctance motor with this structural design, the stator winding 12 adopts a distributed winding, the stator is a sinusoidal magnetic field during operation, the control is relatively simple, the control technology is relatively mature, and the cost of the drive control system is relatively low. On this basis, the rotor 2 includes a rotor body 21 and a plurality of salient poles 22 arranged on its side wall. The rotor 2 adopting this structural design has a salient pole 22 of a protruding structure, which is simple to process, and has a stronger salient pole effect and a larger magnetic resistance change rate, which is beneficial to improving the overload capacity and power density. However, the applicant found that the synchronous reluctance motor in the related art can effectively reduce the torque pulsation and noise during the operation of the motor due to its smooth rotor surface and relatively continuous magnetic resistance change. After the rotor 2 with a salient pole structure design is adopted, the rotor torque fluctuation will increase, and the low-speed operation effect of the motor will deteriorate. Therefore, the synchronous reluctance motor of the embodiment of the present application is designed with a reduction mechanism 3, and the power input end of the reduction mechanism 3 is connected to the rotor shaft 20, so as to reduce its rotation speed, so that the output speed of the synchronous reluctance motor is reduced. By designing the speed reduction mechanism 3, the motor body can achieve a lower speed output at its own higher speed, which is beneficial to avoid torque fluctuations when the motor runs at low speed, thereby improving its running stability and optimizing the low-speed running effect of the motor. By adopting the above-mentioned structural design, a synchronous reluctance motor with a salient pole rotor structure design that runs smoothly at low speed is provided, which solves the technical problems of difficult synchronous reluctance motor rotor processing and low output torque in related technologies.

[0042] 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.

[0043] 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.

[0044] 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 data 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.

[0045] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A synchronous reluctance motor, characterized in that: include: A stator (1), the stator (1) comprising a stator core (11) and a plurality of stator windings (12), the plurality of stator windings (12) being installed in stator slots (110) of the stator core (11), wherein each of the stator windings (12) is a distributed winding; A rotor (2), the rotor (2) being rotatably mounted in a central cavity of the stator (1) around a rotor axis (20), the rotor (2) comprising a rotor body (21) and a plurality of salient poles (22), the salient poles (22) being arranged on a side wall of the rotor body (21), the salient poles (22) being arranged in a radially protruding manner along the rotor (2), and the plurality of salient poles (22) being arranged in sequence and spaced apart along the circumferential direction of the rotor (2); A speed reduction mechanism (3), wherein the input rotation speed of the speed reduction mechanism (3) is greater than the output rotation speed of the speed reduction mechanism (3), and the power input end of the speed reduction mechanism (3) is connected to the rotor shaft (20).

2. The synchronous reluctance motor according to claim 1, characterized in that: The speed reduction mechanism (3) is a speed reduction gear set.

3. The synchronous reluctance motor according to claim 1, characterized in that: The speed reduction mechanism (3) is a planetary gear set.

4. The synchronous reluctance motor according to claim 1, characterized in that: The rotor (2) and the rotor shaft (20) are an integrated structure.

5. The synchronous reluctance motor according to any one of claims 1 to 4, characterized in that: The synchronous reluctance motor further comprises a casing (4) and an inner cylinder (5); the casing (4) cooperates with the inner cylinder (5); a sealed cavity is formed between the casing (4) and the inner cylinder (5); and the stator (1) is arranged in the sealed cavity.

6. The synchronous reluctance motor according to claim 5, characterized in that: The rotor (2) is arranged inside the inner cylinder (5), and the thickness of the portion of the inner cylinder (5) located between the stator (1) and the rotor (2) ranges from 2 mm to 8 mm.

7. The synchronous reluctance motor according to claim 6, characterized in that: The inner cylinder (5) is made of stainless steel.

8. The synchronous reluctance motor according to claim 5, characterized in that: Along the axial direction of the synchronous reluctance motor, the first end of the inner cylinder (5) is sealed, and the synchronous reluctance motor also includes an end cover (6), the end cover (6) is connected to the second end of the inner cylinder (5), and an installation cavity is formed between the end cover (6) and the inner cylinder (5), and the rotor (2) and the speed reduction mechanism (3) are installed in the installation cavity.

9. The synchronous reluctance motor according to claim 8, characterized in that: The end cover (6) is provided with a mounting portion (61) so as to mount the synchronous reluctance motor at a working position via the mounting portion (61).

10. The synchronous reluctance motor according to claim 9, characterized in that: The mounting portion (61) is arranged around the rotor shaft (20) along the circumference of the rotor shaft (20); and / or the power output shaft of the speed reduction mechanism (3) is arranged coaxially with the rotor shaft (20).

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