End magnetic field enhancement and performance improvement structure of induction motor

Abstract

The invention discloses an induction motor end magnetic field enhancement and performance improvement structure, which comprises a stator core, a stator winding and a rotor, magnetic guide rings arranged along the circumferential direction are respectively arranged at the two axial ends of the stator core, and the two end parts of the stator winding respectively pass through the corresponding magnetic guide rings; a guide ring gap is formed in the magnetic guide ring; the magnetic guiding ring is used for effectively guiding leakage flux generated at the end of the stator winding. The two axial ends of the rotor are fixedly connected with magnetic cutting rings respectively, and the magnetic cutting rings rotate along with the rotor. And meanwhile, the magnetic cutting ring passes through the guide ring gap of the magnetic guide ring and enters the magnetic guide ring. The magnetic cutting ring not only can cut magnetic lines of force, but also has the effect of providing torque. Through cooperation of the magnetic cutting ring and the magnetic guiding ring, axial stator winding leakage flux is fully utilized, effective guiding and cutting of magnetic flux are ensured, the output power and efficiency of the motor are improved, and the overall performance of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a structure for enhancing the magnetic field and improving the performance of an induction motor end. Background Art

[0002] As the demand for efficient and reliable motors in industrial production and daily life continues to increase, improving the performance of induction motors has become an urgent research topic. Current induction motors may have problems such as low efficiency and insufficient electromagnetic force in some specific application scenarios, which limits their wider application.

[0003] In existing induction motor technology, the magnetic field generated by the stator winding is usually not fully utilized. Traditional induction motors have certain limitations in improving the induced electromagnetic force of rotor rotation, and it is necessary to seek new structural designs to improve the overall performance of the motor.

[0004] In view of this, the present invention is committed to proposing a structure for enhancing the magnetic field and improving the performance of an induction motor end, thereby improving the performance and efficiency of the induction motor and improving the overall performance of the motor. Summary of the invention

[0005] The object of the present invention is to provide a structure for enhancing the magnetic field and improving the performance of an induction motor end.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: An induction motor end magnetic field enhancement and performance improvement structure comprises a stator core, a stator winding and a rotor, wherein the two axial ends of the stator core are respectively provided with magnetic guide rings arranged in a circumferential direction, and the two ends of the stator winding respectively pass through the corresponding magnetic guide rings; and a guide ring gap is provided on the magnetic guide ring; The two axial ends of the rotor are respectively fixedly connected with magnetic cutting rings, which rotate together with the rotor; at the same time, the magnetic cutting ring passes through the guide ring gap of each magnetic guide ring and enters the magnetic guide ring.

[0007] Furthermore, the magnetic guide rings are fixed at the stator teeth of the stator core, and the number of the magnetic guide rings corresponds to the stator teeth, so that both ends of each stator winding have magnetic guide rings.

[0008] Furthermore, the magnetic guide ring is composed of an iron ring and magnetic mud wrapped outside the iron ring, and the iron ring is fixedly connected to the stator core.

[0009] Furthermore, the iron ring is made of cast iron material.

[0010] Furthermore, the magnetic cutting ring is a planar circular ring, and the magnetic cutting ring is fixed to the rotor end ring through a plurality of connecting struts.

[0011] Further, the magnetic cutting ring is an airfoil shape, which includes an upper planar annular portion and a lower transition connection portion; The axial position of the upper planar annular portion corresponds to the guide ring gap of the magnetic guide ring, and the upper planar annular portion passes through the guide ring gap of the magnetic guide ring and enters the magnetic guide ring; the lower transition connection portion is directly fixedly connected to the rotor end ring.

[0012] Furthermore, the magnetic cutting ring is a copper ring.

[0013] Furthermore, the stator winding is a concentrated winding.

[0014] The beneficial effects of the present invention are: 1. The present invention provides magnetic guide rings at both ends of the stator to effectively guide the magnetic flux generated by the winding ends. Before the motor is running, a three-phase current is passed through the stator winding coil to generate a magnetic field surrounding the winding. Under the guidance of the magnetic guide ring, the magnetic flux at the winding end is distributed along the interior and surface of the magnetic guide ring to form a closed loop. According to the principle of electromagnetic induction, under the action of the magnetic field, an induced electromotive force will be generated inside the magnetic cutting ring at the end of the rotor. Since the magnetic cutting ring and the rotor cage bars are interconnected to form a loop, the electromotive force provides the electrons with power and direction for flow, and an induced current will be generated inside the rotor. When the loop current inside the magnetic cutting ring is in the magnetic field of the stator winding, a Lorentz force is generated, causing the rotor to rotate.

[0015] When the rotor rotates, the magnetic cutting ring with current inside connected to the end of the rotor will cut the magnetic flux generated by the stator winding. According to the principle of electromagnetic induction, the induced electromotive force will be generated inside the magnetic cutting ring again. At this time, the induced current generated by the rotor part that constitutes the loop will increase, and then continuously provide rotational force for the rotor, so that the starting performance and running speed of the motor are significantly improved.

[0016] The present invention cooperates with the magnetic guide ring and the magnetic cutting ring, which is equivalent to a single-phase induction motor with an additional number of stator teeth in the axial direction. The forces generated by them act on the rotor, increasing the torque of the motor, improving the output power and efficiency of the motor, and enhancing the overall performance of the motor.

[0017] 2. The magnetic guide ring in the present invention is composed of an iron ring and magnetic mud wrapped outside the iron ring, which not only increases the connectivity between the iron ring and the stator core, but also improves the magnetic field and increases the conductivity of the magnetic guide ring.

[0018] Specifically, the magnetic mud can further enhance the guiding and distribution effect of the magnetic flux generated by the stator winding, further enhance the magnetic conductivity of the magnetic guide ring, make the magnetic field more concentrated and stable, increase the strength and stability of the magnetic field, and reduce energy waste.

[0019] In addition, the magnetic mud wrapping protects the magnetic guide ring and prevents it from being damaged by external factors, further improving the reliability of the motor.

[0020] 3. The layout of magnetic guide rings at both ends of each stator winding in the present invention makes the guidance of magnetic flux more uniform and efficient. This innovative structural layout helps to improve the overall performance and stability of the motor.

[0021] 4. The magnetic cutting ring in the present invention can not only cut the magnetic lines of force, but also provide torque, which can quickly build up sufficient electromagnetic torque when the motor starts, reduce the starting current, and reduce the impact on the power grid. In addition, the output torque of the motor can be increased.

[0022] The magnetic cutting ring can be installed in two ways: Installation method 1: The magnetic cutting ring is a flat ring, which greatly reduces the volume of the magnetic cutting ring and does not increase the volume of the motor. The magnetic cutting ring is fixed to the rotor end ring through multiple connecting struts, and the torque generated in the axial direction is guided to the rotor.

[0023] Installation method 2: The magnetic cutting ring is an airfoil. The airfoil-shaped magnetic cutting ring reduces the probability of failures caused by loose connections or wear between components, improves the reliability and stability of the motor, and can also reduce the noise generated by friction between the rotor and the air after rotation. In addition, by adjusting the curvature and inclination angle of the airfoil, it can adapt to different speeds, loads and working environments, improving the adaptability of the motor.

[0024] 5. The material of the magnetic cutting ring in the present invention is copper, which can better reduce the loss, better generate current in the copper ring, and then generate greater torque.

[0025] 6. The iron ring in the present invention is made of cast iron material, which can increase the firmness of the motor and increase the electromagnetic torque.

[0026] 7. The stator winding in the present invention is a concentrated winding, so that the magnetic field generated can be used by the axial guide ring and the cutting ring, and the structure is simple, reducing the manufacturing difficulty and cost.

[0027] 8. The design of the magnetic cutting ring at the end of the rotor in the present invention cooperates with the magnetic guide ring structure of the stator part to cut the magnetic lines of force to generate torque, thereby forming a complete electromagnetic induction system (each stator winding and the magnetic guide ring form a closed and independent magnetic circuit, equivalent to a single-phase motor), providing a strong drag load capacity for the operation of the motor.

[0028] 9. The present invention ensures the stability and reliability of the motor during operation through precise component matching and reasonable structural layout. The close matching between various components reduces vibration and noise and prolongs the service life of the motor.

[0029] The present invention fully utilizes the characteristics of each component through a reasonable combination of components such as a stator core, a winding, a magnetic guide ring, and a magnetic cutting ring on a rotor, thereby optimizing and improving the performance of the motor.

[0030] The present invention ensures effective guidance and cutting of magnetic flux by tightly surrounding the magnetic guide ring and the winding end and accurately matching the gap between the magnetic cutting ring and the magnetic guide ring. This precise matching of components improves the working efficiency and reliability of the motor.

[0031] 10. The present invention improves the efficiency of the motor, reduces energy consumption, and reduces the cost of use. At the same time, the improvement of motor performance can reduce the demand for other auxiliary equipment, further reducing the total cost of the system.

[0032] 11. The structural design of the present invention is applicable to various types of induction motors and can be adjusted and optimized according to different needs. It can play a good role in industrial production, transportation, household electricity and other fields.

[0033] This invention can also provide effective solutions for some special application scenarios that require higher motor performance, such as high-speed operation and high-precision control. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A three-dimensional diagram of an embodiment of the present invention; Figure 2 It is a front view of an embodiment of the present invention; Figure 3 A top view of an embodiment of the present invention; Figure 4 for Figure 3 AA section view in; Figure 5 Schematic diagram of the stator part in an embodiment of the present invention; Figure 6 for Figure 5 Axial section of Figure 7 Schematic diagram of the installation of the magnetic guide ring in an embodiment of the present invention; Figure 8 is a schematic diagram of a magnetic guide ring in an embodiment of the present invention; Fig. 9 Schematic diagram of the rotor part in the first embodiment of the present invention; Fig.10 for Fig. 9 The main view; Fig.11 This is a magnetic circuit diagram of a stator winding guided by a magnetic guide ring in an embodiment of the present invention; Fig.12 for Figure 3 The BB section in the figure and the magnetic flux diagram of the stator winding end cut by the magnetic cutting ring; Fig.13 is a schematic diagram of the rotor part in the second embodiment of the present invention; Fig.14 for Fig.13 main view.

[0035] The reference numerals of the components in the figure are as follows: 1-stator core; 2-stator winding; 3-rotor; 4-magnetic guide ring; 5-magnetic cutting ring; 6-connecting support.

[0036] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] Embodiment 1: like Figures 1 to 10 As shown, this embodiment provides an induction motor end magnetic field enhancement and performance improvement structure, including a stator core 1, a stator winding 2 and a rotor 3.

[0039] Magnetic guide rings 4 arranged along the circumferential direction are respectively provided at both axial ends of the stator core 1, and both ends of the stator winding 2 pass through the corresponding magnetic guide rings 4, respectively. A guide ring gap is also provided on the magnetic guide ring 4. The magnetic guide ring 4 is used to effectively guide the magnetic flux generated by the ends of the stator winding 2. Under the guidance of the magnetic guide ring, the magnetic flux is distributed along the inside and surface of the magnetic guide ring 4 to form a closed loop.

[0040] In this embodiment, the specific arrangement of the magnetic guide ring 4 is as follows: the magnetic guide ring 4 is fixed at the stator tooth position of the stator core 1, and the number corresponds to the stator teeth, so that there are magnetic guide rings at both ends of each stator winding. This structural design makes full use of the gap between the stator winding and the stator teeth, increasing the efficiency of the motor. And the layout mode of setting the magnetic guide ring 4 at both ends of each stator winding makes the guidance of the magnetic flux more uniform and efficient. This innovative structural layout helps to improve the overall performance and stability of the motor.

[0041] Specifically, the magnetic guide ring 4 is composed of an iron ring made of cast iron material and magnetic mud completely wrapped outside the iron ring, and the iron ring is fixedly connected to the stator core 1 by welding. Figure 8 The dashed grid in the figure represents magnetic mud.

[0042] The magnetic mud can further enhance the guiding and distribution effect of the magnetic flux generated by the stator winding, further enhance the magnetic conductivity of the magnetic guide ring, make the magnetic field more concentrated and stable, increase the strength and stability of the magnetic field, and reduce energy waste. In addition, the magnetic mud wrapping protects the magnetic guide ring, preventing it from being damaged by external factors, further improving the reliability of the motor.

[0043] The iron ring is made of cast iron material, which can increase the firmness of the motor and increase the electromagnetic torque.

[0044] In this embodiment, the stator winding 2 adopts a concentrated winding, so that the magnetic field generated can be used by the axial guide ring and the cutting ring, and the structure is simple, reducing the manufacturing difficulty and cost.

[0045] The axial ends of the rotor 3 are respectively fixedly connected with magnetic cutting rings 5, and the magnetic cutting rings 5 ​​rotate with the rotor 3. At the same time, the magnetic cutting ring 5 passes through the guide ring gap of the magnetic guide ring 4 and enters the magnetic guide ring 4. The magnetic cutting ring 5 can not only cut the magnetic lines of force, but also provide torque, which can establish sufficient electromagnetic torque more quickly when the motor starts, reduce the starting current, and reduce the impact on the power grid. In addition, the output torque of the motor can be improved.

[0046] In this embodiment, the magnetic cutting ring 5 is a planar annular copper ring, and the axial position of the magnetic cutting ring 5 corresponds to the guide ring gap of the magnetic guide ring 4. The magnetic cutting ring 5 is a copper ring, which can better reduce the loss, better generate current in the copper ring, and then generate greater torque. The magnetic cutting ring is a planar annular ring, which greatly reduces the volume of the magnetic cutting ring without increasing the volume of the motor.

[0047] The magnetic cutting ring 5 is fixed to the end ring of the rotor 3 through three circumferentially distributed connecting pillars 6, and the torque generated in the axial direction is guided to the rotor. The setting of the connecting pillars 6 ensures the stable installation of the magnetic cutting ring 5 at the end of the rotor, so that it can accurately cut the magnetic flux during high-speed rotation and provide continuous power for the motor.

[0048] The present invention ensures effective guidance and cutting of magnetic flux and improves the working efficiency and reliability of the motor by tightly surrounding the magnetic guide ring 4 and the stator winding end, and accurately matching the magnetic cutting ring 5 and the guide ring gap of the magnetic guide ring 4.

[0049] In the present invention, the design of the magnetic cutting ring 5 at the rotor end cooperates with the structure of the magnetic guide ring 4 of the stator part to cut the magnetic lines of force to generate torque, thereby forming a complete electromagnetic induction system (each stator winding and the magnetic guide ring form a closed and independent magnetic circuit, equivalent to a single-phase motor), providing a strong drag load capacity for the operation of the motor.

[0050] The working principle of the present invention is as follows: The specific guidance method of the stator end magnetic guide ring 4 to the stator winding is as follows: Fig.11 As shown, when a three-phase current from outside to inside is passed through the stator winding 2, according to the right-hand rule, the direction of the magnetic field at the upper end of the stator winding 2 is clockwise.

[0051] Similarly, the direction of the magnetic field at the lower end of the stator winding 2 is counterclockwise.

[0052] At this time, the magnetic guide ring 4 wrapped with magnetic mud guides the direction of the magnetic flux, so that the magnetic flux generated by the stator winding 2 forms a closed loop along the inside and surface of the magnetic guide ring.

[0053] The magnetic cutting ring 5 cuts the magnetic flux at the end of the stator winding. Fig.12 shown.

[0054] When the current direction of the stator winding 2 is upward, according to the principle of electromagnetic induction, under the action of the magnetic field, an induced electromotive force will be generated inside the magnetic cutting ring 5 at the end of the rotor. In an induction motor, the magnetic field generated by the stator winding 2 will induce current in the rotor bars. Since the magnetic cutting ring 5 and the rotor bars are connected to each other to form a loop, the electromotive force provides the power and direction for the electrons to flow, and an induced current will be generated inside the rotor 3. When the loop current inside the magnetic cutting ring 5 is in the magnetic field of the stator winding, a Lorentz force is generated, causing the rotor to rotate.

[0055] At this time, in order to hinder the change of the stator magnetic field, the direction of the induced current in the rotor bars should be opposite to the direction of the magnetic field change generated by the stator winding. Since the direction of the magnetic field generated by the stator current is related to the direction of the current, when the stator current is upward, the direction of the magnetic field can be determined according to the right-hand screw rule. The magnetic field generated by the induced current in the rotor bars should hinder the change of the stator magnetic field, so the current direction in the bars next to the rotor is downward (to determine the rotation direction of the bars at this time, the left-hand rule can be used).

[0056] It is known that the current direction of stator winding 2 is upward, and the current direction of the cage bar next to rotor 3 is downward. Extend your left hand, let the magnetic field pass through your palm, and point your four fingers in the direction of the rotor current (i.e. downward). At this time, the direction pointed by your thumb is the direction of force on the rotor, which is also the direction of rotation of rotor 3.

[0057] In this case, the magnetic field points from the stator side to the rotor side, so the rotor rotates inward, that is, in a clockwise direction (the rotation direction of the rotor 3 is as follows Figure 3 (indicated by the arrow in the middle).

[0058] When the rotor 3 rotates, the magnetic cutting ring 5 with current inside connected to the end of the rotor will cut the magnetic flux generated by the stator winding. According to the principle of electromagnetic induction, the induced electromotive force will be generated again inside the magnetic cutting ring. At this time, the induced current generated by the rotor part that constitutes the loop will increase, and then continuously provide rotational force for the rotor, so that the starting performance and running speed of the motor are significantly improved.

[0059] The present invention cooperates with the magnetic guide ring and the magnetic cutting ring, which is equivalent to a single-phase induction motor with an additional number of stator teeth in the axial direction. The forces generated by them act on the rotor, increasing the torque of the motor, improving the output power and efficiency of the motor, and enhancing the overall performance of the motor.

[0060] Embodiment 2: The difference between this embodiment and the first embodiment lies in that the shape of the magnetic cutting ring and the connection and fixing method of the magnetic cutting ring and the rotor end ring are different.

[0061] In this embodiment, the magnetic cutting ring 5 is an airfoil-shaped copper ring, and its cross section is an inverted L-shaped. In other embodiments, the airfoil-shaped copper ring may also be a trumpet-shaped one.

[0062] like Figure 13 to Figure 14 As shown, the magnetic cutting ring 5 includes an upper planar annular portion and a lower transition connection portion which are integrally connected. The axial position of the upper planar annular portion corresponds to the guide ring gap of the magnetic guide ring, and the upper planar annular portion passes through the guide ring gap of the magnetic guide ring and enters the magnetic guide ring; the lower transition connection portion is directly fixedly connected to the rotor end ring.

[0063] In this embodiment, the airfoil magnetic cutting ring reduces the probability of failures caused by loose connections or wear between components, improves the reliability and stability of the motor, and can also reduce the noise generated by friction between the rotor and the air after rotation. In addition, by adjusting the curvature and inclination angle of the airfoil, it can adapt to different speeds, loads and working environments, thereby improving the adaptability of the motor.

[0064] In summary, the present invention improves the working efficiency and reliability of the motor, provides a strong load dragging capacity for the operation of the motor, improves the output power and efficiency of the motor, and improves the overall performance of the motor.

[0065] In addition, the invention ensures the stability and reliability of the motor during operation through precise component matching and reasonable structural layout. The close matching between the various components reduces vibration and noise, and prolongs the service life of the motor. The improved efficiency of the motor reduces energy consumption and reduces the cost of use. At the same time, the improved motor performance can reduce the need for other auxiliary equipment, further reducing the total cost of the system.

[0066] The structural design of the present invention is applicable to various types of induction motors and can be adjusted and optimized according to different needs. It can play a good role in industrial production, transportation, household electricity and other fields. For some special application scenarios with high requirements on motor performance, such as high-speed operation, high-precision control, etc., the invention can also provide an effective solution.

[0067] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0068] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0069] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. An induction motor end magnetic field enhancement and performance improvement structure, comprising a stator core, a stator winding and a rotor, characterized in that: The two axial ends of the stator core are respectively provided with magnetic guide rings arranged in the circumferential direction, and the two ends of the stator winding pass through the corresponding magnetic guide rings respectively; the magnetic guide rings are provided with guide ring gaps; The two axial ends of the rotor are respectively fixedly connected with magnetic cutting rings, which rotate together with the rotor; at the same time, the magnetic cutting ring passes through the guide ring gap of each magnetic guide ring and enters the magnetic guide ring.

2. The structure for enhancing the magnetic field and improving the performance of an induction motor end according to claim 1, characterized in that: The magnetic guide rings are fixed at the stator teeth of the stator core, and the number of the magnetic guide rings corresponds to the stator teeth, so that both ends of each stator winding are provided with magnetic guide rings.

3. The structure for enhancing the magnetic field and improving the performance of an induction motor end according to claim 1 or 2, characterized in that: The magnetic force guide ring is composed of an iron ring and magnetic mud wrapped outside the iron ring, and the iron ring is fixedly connected to the stator core.

4. The structure for enhancing the magnetic field and improving the performance of the induction motor end according to claim 3 is characterized in that: The iron ring is made of cast iron material.

5. The structure for enhancing the magnetic field and improving the performance of an induction motor end according to claim 1, characterized in that: The magnetic cutting ring is a planar circular ring, and is fixed to the rotor end ring through a plurality of connecting struts.

6. The structure for enhancing the magnetic field and improving the performance of an induction motor end according to claim 1, characterized in that: The magnetic cutting ring is an airfoil shape, comprising an upper planar annular portion and a lower transition connection portion; The axial position of the upper planar annular portion corresponds to the guide ring gap of the magnetic guide ring, and the upper planar annular portion passes through the guide ring gap of the magnetic guide ring and enters the magnetic guide ring; the lower transition connection portion is directly fixedly connected to the rotor end ring.

7. The structure for enhancing the magnetic field and improving the performance of the induction motor end according to claim 5 or 6, characterized in that: The magnetic cutting ring is a copper ring.

8. The structure for enhancing the magnetic field and improving the performance of an induction motor end according to claim 1, characterized in that: The stator winding is a concentrated winding.

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