Distributed heat dissipation device of permanent magnet synchronous motor control system

Abstract

A distributed heat dissipation device of a permanent magnet synchronous motor control system is characterized in that a fan cover is installed at the rear end of a stator, a fan is installed on the fan cover, the heat dissipation device comprises a box body and a heat dissipation component, the heat dissipation component is installed on the outer side of the stator of the motor in the circumferential direction, and the hollow box body is installed on the outer side of the heat dissipation component in the circumferential direction; an electronic component needing heat dissipation is placed in the hollow box body. The electronic component with high heat productivity is placed in the hollow box body, and the heat dissipation device is arranged to dissipate heat of the electronic component with high heat productivity. And a fan is arranged at the rear end of the motor, and an air duct is arranged between the fan and the heat dissipation device, so that the stator of the motor and the heat dissipation device are further cooled. Therefore, the permanent magnet synchronous motor provided with the controller is subjected to effective air-cooling heat dissipation, and the heat dissipation device is low in cost, can be suitable for motors of various models, and is high in applicability.

Description

Technical Field

[0001] The invention relates to a permanent magnet synchronous motor with a heat dissipation device, and in particular to a distributed heat dissipation device of a permanent magnet synchronous motor control system. Background Art

[0002] Permanent magnet synchronous motors have many advantages over brushless motors, such as better torque-speed characteristics, high-speed dynamic response, high efficiency, long life, low noise, and high speed. Due to these characteristics, permanent magnet synchronous motors are widely used in daily life appliances, automotive industry, aviation, consumer electronics, medical electronics, industrial automation and other devices and instruments; however, the control system of permanent magnet synchronous motors is more complicated than that of ordinary asynchronous motors, and there are many control methods. In order to make permanent magnet synchronous motors have better control performance, inverter control devices such as frequency converters and control circuit boards are required to drive and control permanent magnet synchronous motors; and these control devices will generate a lot of heat during work, so it is necessary to dissipate heat from these heat-generating control devices. At present, the heat dissipation of the permanent magnet synchronous motor control system is to install the control system components in a control device box, and dissipate the heat of these heat-generating components through a special cooling device. Most of the time, a fan is installed in the control system box to dissipate the heat through the fan; but this makes the control system appear very large, so the current permanent magnet synchronous motor will place the control system inverter in an independent control system box separated from the motor, which is not conducive to the control of the motor, and it is impossible to achieve the improvement of the integration of the permanent magnet synchronous motor body and the motor control system; although the recent development of power control devices such as semiconductors and chips has made these heat-generating electronic components more and more miniaturized, if these heat-generating electronic components are still concentrated together and installed in a control device box, a separate cooling device is still required, which will make the control device box appear very large and is still not conducive to direct installation on the motor casing. Otherwise, it may have an adverse effect on the running stability of the motor, so it is necessary to improve this.

[0003] Through search and inquiry, no public technology identical to the technical solution of the present invention was found, but only some related patents were found. The closest technologies are as follows: 1. The invention patent with the patent number CN202210659355.6 and the name of "A permanent magnet synchronous motor controller based on multiple heat dissipation" discloses a permanent magnet synchronous motor controller based on multiple heat dissipation, including a permanent magnet synchronous motor controller box cover and a circuit board body, the circuit board body is arranged in the permanent magnet synchronous motor controller box cover, the permanent magnet synchronous motor controller box cover is provided with a heat conduction mechanism matched with the circuit board body, the top inner wall of the permanent magnet synchronous motor controller box cover is provided with two exhaust holes, the exhaust holes are provided with a first dustproof filter, the top inner wall of the permanent magnet synchronous motor controller box cover is fixedly connected with an exhaust cover, the permanent magnet synchronous motor controller box cover is provided with a first worm, the exhaust cover is provided with an exhaust assembly, both ends of the first worm are connected to the inner wall of the permanent magnet synchronous motor controller box cover through a first bearing, the permanent magnet synchronous motor controller box cover Air inlet holes are opened on the inner walls on both sides, and fixing rings are fixedly connected on both sides of the permanent magnet synchronous motor controller box cover, a second dust-proof filter is arranged in the fixing ring, the second dust-proof filter is matched with the air inlet hole, the second dust-proof filter and the permanent magnet synchronous motor controller box cover are connected by an elastic mechanism, two baffles are fixedly connected on the inner wall of the fixing ring, a connecting frame is fixedly connected to the second dust-proof filter, a first movable plate is arranged on the top of the connecting frame, a push plate is arranged on one side of the connecting frame, the push plate and the first movable plate are connected by a lifting mechanism, the first movable plate and the first worm are connected by a transmission mechanism, and a driving mechanism matched with the first worm is arranged in the permanent magnet synchronous motor controller box cover; however, this patent only considers the heat dissipation of the circuit board body, and still adopts an independent heat dissipation mechanism for heat dissipation, which will increase the volume of the control box cover, which is not conducive to the structural design of the integration of the motor and the control system.

[0004] 2. Patent number CN202210989198.5, entitled "A battery distributed permanent magnet synchronous motor controller cooling system", discloses a battery distributed permanent magnet synchronous motor controller cooling system, including a cooling box, one side of the cooling box has a water tank connected by a return pipe, the other end of the return pipe is fixedly connected to the top of the water tank, a heat sink is fixedly connected to the cooling box, a heat sink is movably connected to the heat sink, an air cooling mechanism is arranged on the cooling box, a first water cooling element is fixedly connected to the inside of the cooling box, and a first water cooling element is movably connected to the top of the water tank. A heat dissipation unit is connected, and a second water-cooling component is fixedly connected in the water tank. The cooperation between the air-cooling mechanism and the first water-cooling component accelerates the cooling speed of the circulating cooling medium. At the same time, the heat dissipation unit is intermittently in contact with the heat dissipation barrel. The heat dissipation unit and the heat dissipation barrel can absorb the heat of the heat dissipation barrel when installed. When the heat dissipation unit leaves the heat dissipation barrel, the contact area between the heat dissipation unit and the air increases. The heat dissipation efficiency of the heat dissipation unit and the air-cooling mechanism cooperate to improve the heat dissipation efficiency of the heat dissipation unit. Although this heat dissipation structure can obtain a good heat dissipation effect by using water cooling, the volume structure of the heat dissipation device is very large, and it is completely impossible to realize the integrated structure of the motor body and the control system.

[0005] 3. Patent number CN202211112643.6, invention patent named "A permanent magnet synchronous motor controller with a cooling structure", which discloses a permanent magnet synchronous motor controller with a cooling structure, including a motor controller housing and a circuit board body, the circuit board body is arranged in the motor controller housing, the bottom of the circuit board body and the bottom inner wall of the motor controller housing are connected by a plurality of first connecting plates, the bottom of the motor controller housing is fixedly connected with a plurality of mounting frames, the top and bottom of the motor controller housing are provided with a rotating shell, the rotating shell is a cavity structure with one end open, the rotating shell and the motor controller housing are connected by a rotating member, the top and bottom of the circuit board body are provided with a plurality of first rotating shafts, the first rotating shaft is provided with A plurality of heat dissipation fan blades are fixedly connected, one end of the first rotating shaft away from the circuit board body passes through the inner wall of one side of the motor controller housing, a first bearing is provided at the penetration of the first rotating shaft and the motor controller housing, a plurality of first gears are provided in the rotating shell, one end of the first rotating shaft is fixedly connected to the first gear, a first gear ring is fixedly connected to the inner wall of the rotating shell, the first gear is meshed with the gear teeth on the inner wall of the first gear ring, two second rotating shafts are provided in the motor controller housing, a rotating drive mechanism matching the two second rotating shafts is provided on the motor controller housing, the second rotating shaft and the rotating shell are connected through a transmission mechanism, a plurality of mounting holes are opened on the top inner wall of the motor controller housing, a dustproof net is provided in the mounting hole, and an elastic supporting mechanism matching the dustproof net is provided in the mounting hole, A baffle is provided on the top of the dustproof net, and the baffle and the motor controller housing are connected by a resetter. Two cleaning brushes are provided on the top of the motor controller housing, and a second connecting plate is provided above the cleaning brush. The second connecting plate is fixedly connected to a rotating shell located on the top of the motor controller housing, and the cleaning brush and the second connecting plate are connected by an elastic pressing unit. The two second rotating shafts can be driven to rotate through the design of the rotating drive mechanism. The rotating shell is rotatably connected relative to the motor controller housing through the design of the rotating part. The two rotating shells can be driven to rotate when the second rotating shaft rotates through the design of the transmission mechanism. When the second rotating shaft rotates, the second rotating shaft drives the rotating shell to rotate. When the rotating shell drives the first gear ring to rotate through the cooperation of the first gear ring and the first gear, the first gear ring drives The plurality of first gears are driven to rotate synchronously, thereby causing the plurality of first rotating shafts respectively located above and below the circuit board body to rotate simultaneously, so that the heat dissipation fan blades dissipate heat from the top and bottom of the circuit board body, thereby reducing heat accumulation and improving the stability of the permanent magnet synchronous motor controller. The design of the dustproof net reduces the possibility of external dust entering the motor controller housing through the mounting hole. While the rotating shell rotates, the rotating shell located on the top of the motor controller housing drives the two second connecting plates to rotate, thereby causing the cleaning brush to rotate on the top of the motor controller housing, and the dustproof net is cleaned by the cleaning brush. The design of the elastic pressing unit makes the cleaning brush elastically connected to the second connecting plate, thereby causing the cleaning brush to elastically press the top of the dustproof net.Make sure the cleaning brush can contact the dust screen. This patent still only solves the heat dissipation of the circuit board body, and there are still problems such as the large and complex structure of the cooling system, and it is still not suitable for the integrated structural design with the motor body.

[0006] In summary, the existing heat dissipation method of the permanent magnet synchronous motor control system is still complex in structure and bulky in size, and does not take into account the problems mentioned above such as inverter heat dissipation. It is impossible to achieve an integrated structure of the motor control system and the motor body, so it is still necessary to further improve it. Summary of the invention

[0007] The technical problem to be solved by the present invention is: how to simplify the heat dissipation of the permanent magnet synchronous motor control system so that the permanent magnet synchronous motor control system can be integrated with the motor body; and effectively arrange the control system components with large heat generation so that the heat dissipation effect of the motor control system is better and the normal operation of the motor is ensured.

[0008] In view of the above problems, the technical solution proposed in the present invention is: a distributed heat dissipation device for a permanent magnet synchronous motor control system, a wind hood is installed at the rear end of the stator, a fan is installed on the wind hood, the heat dissipation device includes a box and a heat dissipation component, a heat dissipation component is installed in the circumferential direction of the outer side of the motor stator, a hollow box is installed in the circumferential direction of the outer side of the heat dissipation component, and electronic components that need heat dissipation are placed in the hollow box.

[0009] Preferably, the heat dissipation component includes a shell, heat sinks and support ears. The shell is a hollow prism. The heat sinks and support ears are evenly arranged on the circumferential direction of the inner wall of the shell, and the support ears are arranged at both ends of the heat sink.

[0010] Preferably, the stator includes a base and heat dissipation ribs, and the heat dissipation ribs are evenly distributed on the outside of the base; through mounting holes are opened at corresponding positions of the shell of the heat dissipation component and the base of the stator, and bolts pass through the mounting holes to fix the shell and the base together.

[0011] Preferably, the shell of the heat dissipation component is sleeved on the base of the stator, so that the heat dissipation fins inside the shell and the heat dissipation ribs outside the base are staggered, and the heat dissipation fins and support ears on the shell are against the outside of the base.

[0012] Preferably, the box body includes a support plate, which is fixedly connected to the outer side of the shell, and the support plates are evenly distributed in the circumferential direction of the outer side of the shell.

[0013] Preferably, the box body further includes an outer shell, the outer shell includes a top plate and side plates, a side plate is arranged around each of the four sides of the top plate, and the four side plates are arranged perpendicular to the top plate.

[0014] Preferably, the outer shell of the box body is installed on the support plate, and the outer sides of two adjacent outer shells are pressed against each other, so that the inner side of the outer shell of each box body is also pressed against the outer side of the support plate, thereby increasing the stability of the outer shell installed on the support plate.

[0015] Preferably, flanges are fixedly connected at both ends of the machine base, and the flanges at both ends of the machine base are respectively fixedly connected to a front end cover and a rear end cover, and both the front end cover and the rear end cover are provided with through holes.

[0016] Preferably, the wind hood includes a hood body, an annular plate, a support block and a base. The hood body is in the shape of a circular tube. The front end of the hood body is fixedly connected to the rear end of the shell sleeve. The rear end of the hood body is integrally formed with an annular plate. The base is a circular tube with a sealed rear end. The two ends of the support block are fixedly connected to the annular plate and the base respectively, and a gap is left between the base and the annular plate.

[0017] Preferably, a fan is installed on the base of the air hood, and the cavity of the hood is connected with the through holes of the rear end cover and the gaps between the heat sink and the heat dissipation ribs in sequence to form an air duct. When the fan is turned on, air is blown out from the air duct, thereby taking away the heat from the stator and the heat dissipation component.

[0018] The beneficial technical effect of the present invention is: by placing electronic components with high heat generation in a hollow box, and providing a heat dissipation device to dissipate the heat of the electronic components with high heat generation. Then, by installing a fan at the rear end of the motor and providing an air duct between the fan and the heat dissipation device, the stator and the heat dissipation device of the motor are further cooled. Thus, the permanent magnet synchronous motor equipped with a controller is effectively cooled by air, and the heat dissipation device has low cost and can be applied to various types of motors, with strong applicability. In addition, placing various electronic components in the box can prevent dust in the air from entering the box and damaging the electronic components, and can also prevent staff from directly touching the electronic components, eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the first embodiment; Figure 2 for Figure 1 A schematic diagram of the structure in which the front end cover and the wind shield are hidden; Figure 3 for Figure 2 A schematic diagram of the structure of the outer shell in which two boxes are hidden; Figure 4 for Figure 2 A schematic diagram of the structure in which all shells are hidden; Figure 5 It is a schematic structural diagram of the outer shell of a single box body of the first embodiment; Figure 6 It is a schematic diagram of the overall structure of the base and the heat dissipation component of the first embodiment; Figure 7This is a schematic diagram of the disassembled structure of the base and the heat dissipation component of the first embodiment; Figure 8 It is a structural schematic diagram of the front end cover of the first embodiment; Fig. 9 It is a structural schematic diagram of the rear end cover of the first embodiment; Fig.10 It is a schematic structural diagram of the wind shield of the first embodiment; Fig.11 It is a structural schematic diagram of the base of the wind shield of the first embodiment; In the figure: top plate 11, side plate 12, support plate 13, shell 21, heat sink 22, support ear 23, base 31, long heat dissipation rib 321, short heat dissipation rib 322, flange 33, rear end cover 4, front cover plate 51, flange rib 52, rear cover plate 52, cover body 61, annular plate 611, base 62, support block 63. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1

[0021] like Figure 1 and Figure 2 As shown, the heat dissipation device includes a hood, a box and a heat dissipation component. The heat dissipation component is installed in the circumferential direction of the outer side of the stator base 31, and a hollow box is installed in the circumferential direction of the outer side of the heat dissipation component. The heat dissipation component includes a shell 21, and the hood includes a cover 61 and a base 62. The rear end of the shell 21 of the heat dissipation component is fixedly connected to the front end of the cover 61 of the hood, and the fan is installed on the base 62 of the hood.

[0022] like Figure 3 , 4 As shown in Figures 5 and 6, a hollow box is installed in the circumferential direction of the outer side of the heat dissipation component, and the box includes an outer shell and a support plate 13, and the outer shell includes a top plate 11 and a side plate 12. Among them, the support plate 13 is fixedly connected to the outer side of the shell sleeve 21. In order not to interfere with other components and to increase the circulation of air in the box, each group of support plates 13 in this embodiment is provided with three mutually separated support plates 13 along the length direction of the shell sleeve 21. In this embodiment, the shell sleeve 21 is a hollow prism, and the outer surface of the shell sleeve 21 is surrounded by a plurality of rectangular planes of the same size, and the inner side surface of the shell sleeve 21 is a cylindrical surface. The number of planes on the outer surface of the shell sleeve 21 is the same as the number of groups of support plates 13, and multiple groups of support plates 13 are evenly distributed in the circumferential direction of the outer side of the shell sleeve 21.

[0023] In this embodiment, various electronic components with high heat generation are dispersedly placed in various hollow boxes, and various electronic components with high heat generation are installed on the outside of the shell 21 of the heat dissipation component, so that the various electronic components with high heat generation are distributed as evenly as possible on the outside of the shell 21 to avoid heat concentration.

[0024] A side plate 12 is disposed around the top plate 11 of the housing, and the four side plates 12 are disposed perpendicular to the top plate 11. In this embodiment, the height of the side plates 12 at both ends of the length direction of the housing is greater than the height of the side plates 12 at both ends of the width direction of the housing. A gap is provided between the side plates 12 distributed in the length direction and the side plates 12 distributed in the width direction, so that when the housing is installed on the support plate 13, the side plates 12 will not interfere with the support plate.

[0025] The outer shell of the box body is installed on the support plate 13, and the outer sides of two adjacent outer shells are pressed against each other, so that the inner side of the outer shell of each box body is also pressed against the outer side of the support plate 13. The friction between the outer shells is increased, thereby increasing the stability of the outer shell installed on the support plate 13, so that the outer shell is not easy to fall off the support plate 13.

[0026] like Figure 1 , Figures 6 to 9 As shown, the stator of the permanent magnet synchronous motor includes a base 31, heat dissipation ribs and flanges 33, and the heat dissipation ribs are evenly distributed on the outside of the base 31. The two ends of the base 31 are fixedly connected with flanges 33, and the front cover, the rear cover 4 and the flange 33 of the base 31 are all provided with corresponding through mounting holes, and bolts pass through the mounting holes to fix the front cover and the rear cover 4 to the flanges 33 at the two ends of the base 31.

[0027] The heat dissipation component includes a shell 21, a heat sink 22 and a support ear 23. The shell 21 is a hollow prism, and the heat sink 22 and the support ear 23 are evenly arranged on the circumferential direction of the inner wall of the shell 21. The block-shaped support ears 23 are arranged at both ends of the heat sink 22. A hollow box is installed in the circumferential direction of the outer side of the heat dissipation component, and the electronic components that need to dissipate heat are placed in the hollow box.

[0028] The shell 21 of the heat dissipation component is sleeved on the base 31 of the stator, so that the heat dissipation fins 22 on the inner side of the shell 21 and the heat dissipation ribs on the outer side of the base 31 are staggered, and the heat dissipation fins 22 and the support ears 23 on the shell 21 are against the outer side of the base 31. The stator includes the base 31 and the heat dissipation ribs, and the shell 21 of the heat dissipation component and the base 31 of the stator are provided with through mounting holes at corresponding positions, and bolts pass through the mounting holes to fix the shell 21 and the base 31 together.

[0029] In order to prevent the support ear 23 from interfering with the heat dissipation rib when the shell 21 is put on the base 31 of the stator, in this embodiment, the support ear 23 at the rear end of the shell 21 is hollow and fixedly connected to the base 31 with bolts. After the base 31 and the flange 33 are connected, they are first assembled into the shell 21 from the rear end, and then the support ear 23 is installed. When the bolts are passed through the mounting holes of the shell 21 and the base 31, in order to prevent the bolts from interfering with the heat dissipation rib, the heat dissipation rib in this embodiment includes a long heat dissipation rib 321 and a short heat dissipation rib 322, and the short heat dissipation rib 322 is arranged at the position where the mounting hole is opened on the base 31. And the support ear 23 is also arranged at the position where the mounting hole is opened on the shell 21. After the base 31 is assembled into the shell 21, the support ear 23 is located at the short heat dissipation rib 322, and will not interfere with the heat dissipation rib on the base 31.

[0030] like Fig.10 and Fig.11 As shown, the hood includes a hood body 61, an annular plate 611, a support block 63 and a base 62. The hood body 61 is in the shape of a circular tube. The front end of the hood body 61 is fixedly connected to the rear end of the shell 21. The rear end of the hood body 61 is integrally formed with an annular plate 611. The base 62 is a circular tube with a sealed rear end. The two ends of the support block 63 are respectively fixedly connected to the annular plate 611 and the base 62. A gap is left between the base 62 and the annular plate 611. A fan (the fan is not shown in the figure) is installed on the base 62 of the hood. The cavity of the hood body 61 is connected with the through hole of the rear end cover 4, the gap between the heat sink 22 and the heat dissipation ribs in sequence to form an air duct. When the fan is turned on, air is blown out from the air duct, thereby taking away the heat on the stator and the heat dissipation component.

[0031] This embodiment adopts three heat dissipation methods to dissipate heat from the permanent magnet synchronous motor with high heat generation step by step. The first is to install various electronic components with high heat generation on the outside of the shell 21 of the metal heat dissipation component, so that the various electronic components with high heat generation are distributed as evenly as possible on the outside of the shell 21 to avoid heat concentration. The second is to set a metal heat sink 22 on the inside of the shell 21, set a metal box on the outside of the shell 21, and separate the support plate 13 so that each box is connected, further expand the surface area of ​​the metal heat dissipation component, and improve the heat dissipation effect. The third is to turn on the fan, and the air is sucked from the gap between the base 62 and the annular plate 611, and blown out from the cavity of the cover 61, the through hole of the rear end cover 4, the gap between the heat sink 22 and the heat dissipation ribs, and the through hole of the front end cover in turn, thereby taking away the heat on the stator and the heat dissipation component, and further improving the heat dissipation effect. Embodiment 2

[0032] The difference between this embodiment and the first embodiment is that: no heat sink 22 is provided on the inner wall of the shell 21, and the shell 21 is put on the base 31 so that the heat dissipation ribs on the base 31 are in contact with the inner wall of the shell 21 of the heat dissipation component, thereby conducting the heat on the base 31 to the heat dissipation component.

[0033] Obviously, without departing from the principles of the present invention, several improvements or modifications made should be considered as within the protection scope of the present invention.

Claims

1. A distributed heat dissipation device for a permanent magnet synchronous motor control system, wherein a fan is installed on the fan cover at the rear end of the stator, and the fan is installed on the fan cover, wherein: The heat dissipation device includes a box and a heat dissipation component. The heat dissipation component is installed in the circumferential direction outside the motor stator, and a hollow box is installed in the circumferential direction outside the heat dissipation component. Electronic components that need heat dissipation are placed in the hollow box.

2. A distributed heat dissipation device for a permanent magnet synchronous motor control system according to claim 1, characterized in that: The heat dissipation component includes a shell, heat sinks and support ears. The shell is a hollow prism. Heat sinks and support ears are evenly arranged on the circumferential direction of the inner wall of the shell, and the support ears are arranged at both ends of the heat sink.

3. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 2, characterized in that: The stator includes a base and heat dissipation ribs, which are evenly distributed on the outside of the base; through mounting holes are opened at corresponding positions of the shell of the heat dissipation component and the stator base, and bolts pass through the mounting holes to fix the shell and the base together.

4. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 3, characterized in that: The shell of the heat dissipation component is sleeved on the base of the stator, so that the heat dissipation fins inside the shell and the heat dissipation ribs outside the base are staggered, and the heat dissipation fins and supporting ears on the shell are against the outer side of the base.

5. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 4, characterized in that: The box body comprises a support plate, which is fixedly connected to the outer side of the shell sleeve, and the support plates are evenly distributed in the circumferential direction of the outer side of the shell sleeve.

6. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 5, characterized in that: The box body also includes an outer shell, which includes a top plate and side plates. A side plate is arranged around each of the four sides of the top plate, and the four side plates are arranged perpendicular to the top plate.

7. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 6, characterized in that: The outer shell of the box body is installed on the support plate, and the outer sides of two adjacent outer shells are pressed against each other, so that the inner side of the outer shell of each box body is also pressed against the outer side of the support plate, thereby increasing the stability of the outer shell installed on the support plate.

8. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 7, characterized in that: Flanges are fixedly connected at both ends of the machine base, and the flanges at both ends of the machine base are respectively fixedly connected with a front end cover and a rear end cover, and both the front end cover and the rear end cover are provided with through holes.

9. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 8, characterized in that: The wind hood includes a hood body, an annular plate, a support block and a base. The hood body is in the shape of a circular tube. The front end of the hood body is fixedly connected to the rear end of the shell. The rear end of the hood body is integrally formed with an annular plate. The base is a circular tube with a sealed rear end. The two ends of the support block are fixedly connected to the annular plate and the base respectively, and a gap is left between the base and the annular plate.

10. The distributed heat dissipation device of a permanent magnet synchronous motor control system according to claim 9, characterized in that: A fan is installed on the base of the air hood. The cavity of the hood is connected with the through holes of the rear end cover and the gaps between the heat sink and the heat dissipation ribs in sequence to form an air duct. When the fan is turned on, air is blown out from the air duct, thereby taking away the heat from the stator and the heat dissipation components.

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