A cooling device for enhancing heat dissipation performance of a motor by using magnetic flux leakage and a motor

Abstract

The application discloses a cooling device for enhancing heat dissipation performance of a motor by using magnetic flux leakage and the motor, which comprises a shell, an agitating plate and a baffle. The shell is a sealed cavity. The baffle is vertically and / or horizontally arranged in the shell and divides the interior of the shell into at least two chambers by the baffle. The at least two chambers are communicated with each other through a communication channel arranged at the baffle. The shell is provided with heat dissipation holes communicated with the chambers. The agitating plate is arranged in at least one of the at least two chambers. The agitating plate is magnetized in thickness and periodically reciprocally moves in the chamber under the action of the magnetic flux leakage in the motor, and pushes the cooling liquid to flow into and out of the chamber through the heat dissipation holes. A magnetic pulling force in different directions is applied to the agitating plate by the magnetic field formed by the motor during operation, so that the agitating plate reciprocally moves in the chamber, the cooling liquid in the chamber flows out of the chamber, exchanges heat with the external cooling liquid, the motor is cooled, and the heat dissipation performance of the motor is enhanced.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a cooling device and motor that enhances the heat dissipation performance of a motor by utilizing leakage flux. Background Technology

[0002] High-speed permanent magnet generators have advantages such as simple structure, low loss, low vibration and noise, fast dynamic response, high power density, high transmission system efficiency, and reliable operation. They have become key power equipment in micro gas turbine distributed energy systems, meeting the requirements of micro gas turbine power generation systems towards miniaturization and integration. Back-wound windings are mainly used in the field of high-speed motors. Back-wound windings are wound around the inner slot and the back slot of the stator, respectively. Using back-wound windings in high-speed motors can reduce the length of the winding ends, thereby reducing the axial length of the rotor and enhancing the mechanical strength of the rotor. However, half of the back-wound winding is located on the back of the stator, resulting in low utilization of the back-wound windings and the generation of leakage flux. The leakage flux enters the casing, induces eddy currents on the surface of the casing, and generates a large amount of heat accumulation, which will have an adverse effect on the high-speed motor. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a cooling device and motor that enhance the heat dissipation performance of a motor by utilizing leakage magnetic flux. The changing leakage magnetic field generated by the leakage magnetic flux interacts with the magnetic field of a magnetic stirring plate, producing a magnetic pulling force whose direction changes with the magnetic field. This force drives the stirring plate to move, accelerating the flow of coolant inside the motor and enhancing the motor's heat dissipation performance.

[0004] To solve the above-mentioned technical problems, the present invention provides a technical solution: a cooling device for enhancing the heat dissipation performance of a motor by utilizing leakage magnetic flux, comprising a housing, a stirring plate, a baffle, and heat dissipation holes, characterized in that: the housing is a sealed cavity structure, the baffle is vertically and / or horizontally arranged inside the housing, and the interior of the housing is divided into at least two chambers by the baffle, and the at least two chambers are interconnected by a connecting channel provided at the baffle, the housing is provided with heat dissipation holes communicating with the chambers, and the stirring plate is provided in at least one of the at least two chambers, the stirring plate is magnetized by thickness and moves periodically back and forth in the chamber under the action of leakage magnetic flux in the motor, and pushes the coolant into and out of the chamber through the heat dissipation holes.

[0005] Furthermore, the baffle is a single unit, vertically arranged inside the housing, and divides the interior of the housing into left and right chambers.

[0006] Furthermore, there are two agitator plates, which are vertically arranged in the left and right chambers respectively, and the magnetic poles of the two agitator plates are the same. Both agitator plates are parallel to the plane formed by the baffle.

[0007] Furthermore, there are two baffles, which are arranged in a cross shape inside the shell, and the interior of the shell is divided into four chambers arranged in a grid pattern by the two baffles.

[0008] Furthermore, there are two agitator plates, which are respectively arranged horizontally in the two lowest chambers of the four chambers, and the magnetic poles of the two agitator plates are opposite. Both agitator plates are parallel to the plane formed by the horizontally arranged baffles.

[0009] Furthermore, the dimensions of the baffle are matched with the dimensions of the chamber, so that the baffle will not tilt when it moves periodically back and forth within the chamber.

[0010] Furthermore, the heat dissipation holes are disposed on the lower wall and / or two opposite side walls of the housing.

[0011] To solve the above-mentioned technical problems, the present invention provides a technical solution: an electric motor, including a motor body and a cooling device, wherein the cooling device is a cooling device that enhances the heat dissipation performance of the motor by utilizing leakage flux as described above. The motor body includes a rotor, a slotted stator, back-wound windings, a motor housing, and coolant. The slotted stator is provided with mutually symmetrical stator inner slots and stator back slots with back-wound windings. The coolant fills the motor housing. The feature is that the cooling device is located between the motor housing and the slotted stator. The upper end of the cooling device is connected to the motor housing and is located directly above each back-wound winding. The agitator in the cooling device moves periodically back and forth in the cavity under the action of the leakage flux inside the motor, and pushes the coolant into and out of the cavity through the heat dissipation holes, and merges with the coolant flowing between the motor housing and the slotted stator.

[0012] Furthermore, a housing groove is provided on the inner wall of the motor housing at a position corresponding to the back-wound winding, and the upper wall and side wall of the cooling device are axially embedded in the housing groove and detachably connected to the motor housing.

[0013] The beneficial effects of this invention are as follows:

[0014] 1. This application utilizes the interaction between the changing leakage magnetic field generated by the leakage flux and the magnetic field of the magnetic stirring plate to generate a magnetic pulling force whose direction changes with the magnetic field, thus driving the stirring plate to move. Since the leakage magnetic field is a rotating magnetic field, the stirring plate will make periodic reciprocating motion in the cavity, causing the coolant in the cavity to be squeezed into and out of the cavity, mixing with the coolant outside the cavity, promoting the flow of coolant, accelerating motor cooling, and enhancing the motor's heat dissipation performance.

[0015] 2. In this application, the cooling device is embedded in the corresponding slot on the motor housing, which increases the overall rigidity of the motor, raises the natural frequency of the motor, and can avoid the resonant frequency to a certain extent, thereby reducing motor vibration.

[0016] 3. In this application, the cooling device is located directly above the back-wound winding, which can further enhance the effect of leakage flux and ensure that the magnetic pulling force on the magnetic stirring plate in the cooling device is always at its maximum value, so that the inflow and outflow of coolant in the chamber and coolant outside the chamber are kept at a high speed.

[0017] 4. In this application, the cooling and heat dissipation work is synchronized with the motor operation, which can reduce the heat generated by the motor in a timely and effective manner. When the motor starts, current is passed through the back winding, and a leakage magnetic field is generated on the back, and the cooling device starts to operate.

[0018] 5. In this application, the high-speed inflow and outflow of coolant through the heat dissipation holes drives the flow of coolant throughout the motor housing; simultaneously, the vibration generated during motor operation also drives the flow of coolant within the motor housing. The collision of coolant in these two motion states makes the heat exchange between the coolant and the external coolant more uniform, further improving the cooling effect; at the same time, the collision of coolant in these two motion states will change the mass distribution and stiffness of the motor, and the damping of the coolant will also increase, hindering the vibration of the motor, changing the natural frequency of the motor, and thus reducing the vibration of the motor.

[0019] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only twelve of the drawings in this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the motor structure.

[0022] Figure 2This is a diagram showing the installation location of the cooling device.

[0023] Figure 3 This is a schematic diagram showing the direction of the magnetic field generated by a back-wound winding.

[0024] Figure 4 Schematic diagram of the cooling device Figure 1 .

[0025] Figure 5 Schematic diagram of the cooling device Figure 2 .

[0026] Figure 6 This is a schematic diagram of a stirring plate in a cooling device.

[0027] Figure 7 for Figure 6 A schematic diagram illustrating the principle of magnetic attraction generated by the stirring plate.

[0028] Figure 8 for Figure 6 A schematic diagram showing the direction of movement of the agitator plate and coolant.

[0029] Figure 9 This is a schematic diagram of another structure of the stirring plate in the cooling device.

[0030] Figure 10 for Figure 9 A schematic diagram illustrating the principle of magnetic attraction generated by the stirring plate.

[0031] Figure 11 for Figure 9 A schematic diagram showing the direction of movement of the agitator plate and coolant.

[0032] Figure 12 This is a schematic diagram showing the direction of coolant movement at the lower wall of the cooling device.

[0033] In the diagram, 1-stirring plate, 2-shell, 3-heat dissipation hole, 4-baffle, 5-connecting channel, 6-shell groove; 21-side wall, 22-upper wall, 23-lower wall; A-cooling device, B-rotor, C-slotted stator, D-back-wound winding, E-motor housing, F-flow direction of coolant flowing out of the chamber from the heat dissipation hole, G-flow direction of coolant flowing into the chamber from the heat dissipation hole, H-moving direction of stirring plate, I-current direction. Detailed Implementation

[0034] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0035] It should be understood that the steps described in the method embodiments of the present invention may be performed in different orders. Furthermore, the method embodiments may include additional steps or omit the steps shown. The scope of the present invention is not limited in this respect.

[0036] The names of the messages or information exchanged between the multiple devices in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of these messages or information.

[0037] Example 1

[0038] like Figures 1-8 As shown, a cooling device A that enhances the heat dissipation performance of a motor by utilizing leakage magnetic flux includes a housing 2, a stirring plate 1, a baffle 4, and heat dissipation holes 3. The housing 2 is a sealed cavity structure formed by four side walls 21, an upper wall 22, and a lower wall 23. There is one baffle 4, which is vertically arranged inside the housing 2 (preferably in the middle position). Its upper and lower ends are welded to the upper wall 22 and the lower wall 23, respectively, and are perpendicular to the upper wall 22 and the lower wall 23. At the same time, the baffle 4 divides the interior of the housing 2 into a left chamber and a right chamber, and the left chamber and the right chamber are connected to each other through a connecting channel 5 provided at the baffle 4, which facilitates the flow of coolant between the left chamber and the right chamber. The lower wall 23 and / or any two corresponding side walls 21 of the housing 2 are provided with heat dissipation holes 3 that communicate with the chambers. There are two stirring plates 1, both of which are magnetized left and right. The two stirring plates 1 are vertically arranged on the left and right sides, respectively. In the right and left chambers, the magnetic poles of the two agitators 1 are in the same direction, and both agitators 1 are parallel to the plane formed by the baffle 4. Under the action of the leakage flux inside the motor, the agitators 1 are subjected to the same magnetic pull, and move back and forth periodically in the chamber, agitating the coolant inside the chamber. After being squeezed, the coolant in the chamber is discharged from the chamber through the heat dissipation hole 3 and flows into the coolant flowing in the gap between the motor housing E and the slotted stator C. The coolant flowing in the gap between the motor housing E and the slotted stator C can also flow into the chamber through the heat dissipation hole 3, promoting the flow of coolant. The oil in the gap between the motor housing E and the slotted stator C has a high temperature due to the heat generated by absorbing the eddy current effect of the motor housing E and the iron loss of the slotted stator C. This allows the incoming coolant to exchange heat with the coolant in the gap, achieving a cooling effect.

[0039] The dimensions of the baffle 4 are matched with the dimensions of the cavity, so that the baffle 4 will not tilt when it moves back and forth periodically in the cavity. The height and width of the stirring plate 1 are slightly smaller than the internal height and width of the cavity, so that while the stirring plate 1 moves left and right in the cavity, the displacement range and tilt range of the stirring plate 1 are limited, so that the stirring plate 1 is always kept within the tilt range, preventing the two stirring plates 1 from tilting at a large angle and getting stuck in the cavity, stabilizing the inflow and outflow of coolant, and making the motor heat dissipation uniform.

[0040] The magnetic pull on the stirring plate 1 is caused by:

[0041] Assuming the direction of the current in the back-wound winding D is the same as the direction of the magnetic poles of the stirring plate 1, Figure 3 and Figure 7 As shown, the current flowing through the back-wound winding D generates a leakage magnetic field from the N pole to the S pole on the back of the stator winding D. The two stirring plates 1 (magnetized left and right) also generate a magnetic field from the N pole to the S pole. Figure 7 The magnetic field lines of the two magnetic fields show that the leakage magnetic field on the back is opposite to the N pole of the magnetic field of the two stirring plates 1. Due to the repulsion between like poles, the magnetic plate moves to the right under the action of the repulsive magnetic pull. Meanwhile, the back-wound winding D of the motor carries an alternating current. The three-phase windings D of the motor are in opposite directions, which generates a rotating magnetic field. Therefore, the stirring plates 1 move periodically left and right in the rotating magnetic field.

[0042] The structure formed by the aforementioned cooling device A, which utilizes leakage flux to enhance the heat dissipation performance of a motor, and the motor during use is another technical solution to be protected in this application. Specifically, it is: a motor, including a motor body and a cooling device A, wherein the cooling device A is the aforementioned cooling device A that utilizes leakage flux to enhance the heat dissipation performance of a motor. The motor body includes a rotor B, a slotted stator C, a back-wound winding D, a motor housing E, and a coolant. The slotted stator C is provided with mutually symmetrical stator Cs with back-wound windings D. The inner slot and the back slot of the stator C are filled with coolant inside the motor housing E. The inner wall of the motor housing E is provided with a shell groove 6 at a position corresponding to the back-wound winding D. The cooling device A is located between the motor housing E and the slotted stator C. The upper wall 22 and the upper end of the side wall 21 of the cooling device A are axially embedded in the shell groove 6 and are detachably connected to the motor housing E (the shell groove 6 has the same shape as the upper end of the cooling device A, which can effectively utilize the gap between the motor housing E and the slotted stator C). At this time, the cooling device A is located directly above each back-wound winding D.

[0043] When the motor is running and AC power is applied, a leakage magnetic field is generated on the back of the back-wound winding D. At this time, the two stirring plates 1 located in the cavity will be subjected to magnetic pull in the same direction, making periodic reciprocating movements in the cavity, and pushing the coolant to flow into and out of the cavity through the heat dissipation hole 3, and merge with the coolant flowing between the motor housing E and the slotted stator C.

[0044] Example 2

[0045] like Figures 9-12 As shown, this embodiment is obtained by changing the number and arrangement of technical features such as baffle 4 and stirring plate 1 based on embodiment one. The remaining technical features are the same as in embodiment one, and the similarities will not be repeated here. The difference between this embodiment and embodiment one is that there are two baffles 4, one baffle 4 is in a vertical state and the other baffle 4 is in a horizontal state, so that the two baffles 4 are arranged in a cross shape inside the shell 2, and the interior of the shell 2 is divided into four chambers arranged in a grid pattern by the two baffles 4. The four chambers are interconnected by the connecting channels 5 provided at the baffles 4, which facilitates the flow of coolant between the four chambers. The lower wall 23 of the shell 2 and / or any two corresponding side walls 21 are provided with heat dissipation holes 3 that communicate with the chambers. There are two stirring plates 1, which are arranged horizontally in the two lowest chambers of the four chambers respectively. The magnetic poles of the two stirring plates 1 are opposite, and both stirring plates 1 are parallel to the plane formed by the horizontally arranged baffles 4.

[0046] In this embodiment, the stirring plate 1 is magnetized vertically, and the magnetic poles of the two stirring plates 1 are opposite. Since when a stirring plate 1 with vertical magnetization is placed horizontally, the magnetic field it generates is radial, while the magnetic field generated by the back winding D of the slotted stator C is tangential, the interaction between the two magnetic fields cannot generate the magnetic pull force that pushes the stirring plate 1 to move up and down. Therefore, in this embodiment, two stirring plates 1 with vertical magnetization but opposite magnetic pole directions are placed side by side, so that the upper N pole and S pole form a tangential magnetic field, and the lower N pole and S pole generate a tangential magnetic field, which repels or attracts the leakage magnetic field, pushing the stirring plate 1 to move up and down. The stirring plate 1 stirs the coolant inside the chamber. After being squeezed, the coolant in the chamber is discharged from the chamber through the heat dissipation hole 3 and flows into the coolant flowing in the gap between the motor housing E and the slotted stator C. The coolant flowing in the gap between the motor housing E and the slotted stator C can also flow into the chamber through the heat dissipation hole 3, which promotes the flow of coolant.

[0047] The magnetic pull on the stirring plate 1 is caused by:

[0048] Assuming the direction of the current in the back-wound winding D is the same as the direction of the magnetic poles of the stirring plate 1, Figure 3 and Figure 9As shown, two agitator plates 1, magnetized vertically but with opposite pole directions, are placed side by side. The upper N and S poles form a tangential magnetic field, and the lower N and S poles generate a tangential magnetic field. Simultaneously, current flows through the leakage magnetic field generated by the back-wound winding D. Figure 9 The magnetic field lines of the three magnetic fields show that the N pole magnetic field lines of the two magnetic fields are opposite each other. Due to the repulsion between like poles, they push the stirring plate 1 to move upward.

[0049] In this embodiment, the length and width of the stirring plate 1 are slightly smaller than the internal length and width of the cavity. This allows the stirring plate 1 to move up and down within the cavity while limiting its displacement and tilt range. This keeps the stirring plate 1 within its tilt range, preventing the two stirring plates 1 from tilting at large angles and getting stuck in the cavity. This stabilizes the flow of coolant and ensures uniform heat dissipation from the motor.

[0050] In this embodiment, the two stirring plates 1 are separated by a vertically arranged baffle 4 to reduce the attraction between like poles and the repulsion between opposite poles. At the same time, the arrangement of the transverse baffle 4 limits the rising distance of the stirring plates 1 to prevent the stirring plates 1 from moving to the top of the chamber and adhering to the upper wall 22.

[0051] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. An electric motor, comprising a motor body and a cooling device, wherein the motor body includes a rotor, a slotted stator, back-wound windings, a motor housing, and coolant, the slotted stator having mutually symmetrical stator inner slots and stator back slots with back-wound windings, and the coolant filling the motor housing, characterized in that: The cooling device includes a housing, a stirring plate, a baffle, and heat dissipation holes. The housing is a sealed cavity structure. The baffle is vertically and / or horizontally arranged inside the housing, dividing the interior of the housing into at least two chambers. The at least two chambers are interconnected through a connecting channel provided at the baffle. The housing has heat dissipation holes communicating with the chambers. The stirring plate is disposed in at least one of the at least two chambers. The stirring plate is magnetized along its thickness direction. The height and width of the stirring plate are slightly smaller than the internal height and width of the chamber. Under the action of the leakage magnetic flux of the motor, the stirring plate periodically reciprocates within the chamber, pushing the coolant through. The cooling device flows into and out of the chamber through the heat dissipation holes. The cooling device is located between the motor housing and the slotted stator, and directly above each back-wound winding. The upper end of the cooling device is connected to the motor housing. A shell groove is provided on the inner wall of the motor housing at a position corresponding to the back-wound winding. The upper wall and side wall of the cooling device are axially embedded in the shell groove and detachably connected to the motor housing. The shape of the shell groove matches the upper end of the cooling device, so that the agitator in the cooling device moves periodically back and forth in the chamber under the action of the internal leakage magnetic flux of the motor, and pushes the coolant into and out of the chamber through the heat dissipation holes, and merges with the coolant flowing between the motor housing and the slotted stator.

2. The motor according to claim 1, characterized in that: There is one baffle, which is vertically arranged inside the housing and divides the interior of the housing into two chambers, left and right, with the baffle as the boundary.

3. The motor according to claim 2, characterized in that: There are two agitator plates, which are vertically arranged in the left and right chambers respectively. The magnetic poles of the two agitator plates are the same, and both agitator plates are parallel to the plane formed by the baffle.

4. The motor according to claim 1, characterized in that: There are two baffles, which are arranged in a cross shape inside the shell, and the interior of the shell is divided into four chambers in a grid pattern by the two baffles.

5. The motor according to claim 4, characterized in that: There are two agitator plates, which are horizontally arranged in the two lowest chambers of the four chambers, and the magnetic poles of the two agitator plates are opposite. Both agitator plates are parallel to the plane formed by the horizontally arranged baffles.

6. A motor according to any one of claims 1-5, characterized in that: The dimensions of the baffle are matched with the dimensions of the chamber, and the baffle will not tilt when it moves periodically back and forth within the chamber.

7. The motor according to claim 6, characterized in that: The heat dissipation holes are located on the lower wall and / or two opposite side walls of the housing.

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