Permanent magnet traction motor and railway vehicle

Abstract

The permanent magnet traction motor comprises a motor base, a rotor, a stator and ventilation rib plates, a cooling water channel is formed in the circumferential side of the inner wall of the motor base, the rotor and the stator are both arranged in the motor base, an air gap is formed between the rotor and the stator, and ventilation holes are formed in the rotor; the ventilation rib plate is arranged on the outer wall of the motor base and extends in the axial direction, an air channel is formed between the ventilation rib plate and the outer wall of the motor base, and the air channel is communicated with the air gap and the ventilation hole. According to the permanent magnet traction motor, the external installation space of the motor is fully utilized, and the effective size of the motor is reduced; the cooling water channel is formed on the peripheral side of the inner wall of the motor base, and the air channel and the cooling water channel are located on the inner wall and the outer wall of the motor base respectively, so that the cooling water channel can cool circulating air in the air channel, the heat dissipation efficiency of the motor is improved, and the temperature rise speed of the motor is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of traction motors, and in particular to a permanent magnet traction motor and a rail vehicle. Background Art

[0002] The development of permanent magnet traction motors in the field of rail transit is of great significance, mainly reflected in their outstanding advantages in terms of high efficiency and energy saving. At present, permanent magnet traction motors have been widely used in the field of rail transit, especially in subways, light rails and other systems, gradually replacing asynchronous traction motors and becoming the mainstream motors.

[0003] Permanent magnet traction motors have strong magnetism because their rotors are permanent magnets. In addition, the operating environment of rail transit lines is harsh. In order to prevent foreign matter such as iron filings from being sucked into the motor and affecting its operating safety, permanent magnet traction motors are usually designed as closed structures. Therefore, their thermal management is a big challenge. Traditional heat dissipation methods are often not sufficient to cope with the heat generated by permanent magnet traction motors. A more efficient heat dissipation system needs to be designed to keep the operating temperature of the traction motor within a safe range.

[0004] At present, the internal circulation of the permanent magnet traction motor is to connect the N end and the D end through the stator ventilation hole 02 arranged on the outside of the stator 01. Figure 1 On the one hand, the stator ventilation holes 02 occupy the magnetic circuit space, making the outer diameter of the stator punching sheet larger, resulting in a larger motor volume and reduced space utilization; on the other hand, the stator ventilation holes 02 are not in direct contact with the cooling medium, the heat dissipation capacity is poor, and the motor temperature rise is high. Summary of the invention

[0005] The present invention provides a permanent magnet traction motor and a rail vehicle, so as to solve the technical problem in the prior art that the setting of stator ventilation holes increases the temperature rise of the traction motor and causes the motor volume to become larger.

[0006] To achieve the above object, the technical solution provided by the present invention is as follows: According to a first aspect of the present invention, a permanent magnet traction motor is provided, comprising a motor base, a rotor, a stator and ventilation ribs, wherein a cooling water channel is formed on the circumferential side of the inner wall of the motor base, the rotor and the stator are both arranged in the motor base with an air gap formed therebetween, and ventilation holes are formed in the rotor; the ventilation ribs are arranged on the outer wall of the motor base and extend axially, an air duct is formed between the ventilation ribs and the outer wall of the motor base, and the air duct is respectively connected to the air gap and the ventilation holes.

[0007] Furthermore, there are multiple ventilation ribs, and the multiple ventilation ribs are arranged at intervals on the outer wall of the motor base.

[0008] Furthermore, the number of the ventilation ribs is 3, and the 3 ventilation ribs are evenly arranged on the outer wall of the motor base.

[0009] Furthermore, the length of the air channel in the axial direction is greater than the length of the cooling water channel in the axial direction.

[0010] Furthermore, two end portions of the outer wall of the motor base are respectively provided with connecting holes, and the air duct is respectively connected with the air gap and the ventilation hole through the two connecting holes.

[0011] Furthermore, the permanent magnet traction motor also includes a pressure regulating valve, and the pressure regulating valves are arranged at both ends of the ventilation ribs to isolate or connect the air duct with the outside.

[0012] Furthermore, the permanent magnet traction motor includes a stator core, a winding, a sleeve and a temperature sensor. The stator core is arranged in the motor base, the winding is wound on the stator core, an insulating paint coating is formed on the surface of the winding, one end of the sleeve is closed and located in the nose gap of the winding, one end of the temperature sensor is inserted into the sleeve, and the other end extends out of the motor base.

[0013] A second aspect of the present invention provides a rail vehicle comprising the above-mentioned permanent magnet traction motor.

[0014] The permanent magnet traction motor provided by the present invention is provided with ventilation ribs on the outer wall of the motor base, and the ventilation ribs extend axially. An air duct is formed between the ventilation ribs and the motor base, and the air duct is connected with the air gap and ventilation holes in the motor base respectively. Compared with the existing design of stator ventilation holes, the external installation space of the motor is fully utilized and the effective volume of the motor is reduced; and a cooling water channel is formed on the inner wall circumferential side of the motor base, and the air duct and the cooling water channel are respectively located on the inner wall and the outer wall of the motor base, so that the cooling water channel can cool the circulating air in the air duct, thereby improving the heat dissipation efficiency of the motor and reducing the temperature rise rate of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a cross-sectional structural diagram of an existing permanent magnet traction motor in the background technology; Figure 2 It is a schematic diagram of the side structure of a permanent magnet traction motor in an embodiment of the present invention; Figure 3 for Figure 2 Cross-sectional structural diagram.

[0017] Reference numerals: 10. Motor base; 11. Cooling water channel; 20. Ventilation ribs; 21. Air duct; 30. Pressure regulating valve; 41. stator core; 42. winding; 43. temperature sensor; 51. rotor; 52. ventilation hole; 60. air gap; 70. rotating shaft; 80. fan; 91. Transmission end cover; 92. Non-transmission end cover; 93. Connecting hole. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] It should be noted that when an element is referred to as being "fixed on" or "set on" another element, it can be directly on the other element or indirectly set on the other element; when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0020] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0021] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" and "several" mean two or more, unless otherwise clearly and specifically defined.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0023] like Figure 2 , Figure 3 As shown, an embodiment of the present application provides a permanent magnet traction motor, including a motor base 10, a rotor 51, a stator and a ventilation rib 20, a cooling water channel 11 is formed on the inner wall circumferential side of the motor base 10, the rotor 51 and the stator are both arranged in the motor base 10, and an air gap 60 is formed therebetween, and ventilation holes 52 are formed in the rotor 51; the ventilation rib 20 is arranged on the outer wall of the motor base 10 and extends axially, an air duct 21 is formed between the ventilation rib 20 and the outer wall of the motor base 10, and the air duct 21 is respectively connected to the air gap 60 and the ventilation hole 52.

[0024] In the embodiment of the present application, a stator, a rotor 51, a fan 80, and a rotating shaft 70 are arranged in the motor base 10 of the permanent magnet traction motor, and a transmission end bearing assembly and a non-transmission end bearing assembly are arranged at both ends of the motor base 10. The stator includes a stator core 41 and a winding 42, and the rotor 51 includes a rotor core 51 and a permanent magnet embedded in the rotor core 51. The rotating shaft 70 passes through the rotor core 51 and is connected to the transmission end bearing assembly and the non-transmission end bearing assembly at both ends. The fan 80 is arranged at one end of the rotating shaft 70. An air gap 60 is formed between the stator and the rotor 51. A ventilation hole 52 is arranged inside the rotor 51.

[0025] The transmission end bearing assembly is arranged at the transmission end of the motor shaft 70, and the transmission end bearing assembly includes a transmission end cover 91 and a transmission end bearing. The inner ring of the transmission end bearing is connected to the motor shaft 70 and the outer ring is connected to the transmission end cover 91. The transmission end cover 91 and the transmission end bearing are connected at the axial upper limit position to synchronously move axially, and the motor shaft 70 can move axially relative to the transmission end cover 91. The non-transmission end bearing assembly is arranged at the non-transmission end of the motor shaft 70, and the non-transmission end bearing assembly includes a non-transmission end cover 92, a non-transmission end bearing and a sleeve. The sleeve is sleeved on the motor shaft 70, and the inner ring of the non-transmission end bearing is connected to the sleeve and the outer ring is connected to the non-transmission end cover 92. The non-transmission end cover 92, the non-transmission end bearing and the sleeve are connected at the axial upper limit position to synchronously move axially, and the sleeve is connected to the motor shaft 70 at the circumferential upper limit position to synchronously rotate, and the motor shaft 70 can rotate circumferentially relative to the sleeve. The transmission end cover 91 and the non-transmission end cover 92 are respectively mounted on two ends of the motor base 10 .

[0026] In the embodiment of the present application, a ventilation rib plate 20 is provided outside the motor base 10, and an air duct 21 is formed between the ventilation rib plate 20 and the outer wall of the motor base 10. Figure 3 The air duct 21 is connected to the air gap 60 to form the first circulation loop of the motor; the air duct 21 is connected to the ventilation hole 52 in the rotor 51 to form the second circulation loop of the motor. The permanent magnet traction motor exchanges heat with the outside world through the cooling water channel 11 and the above two circulation loops to enhance the heat dissipation capacity of the motor and reduce the temperature rise of the motor.

[0027] In the embodiment of the present application, the ventilation ribs 20 extend in the axial direction, that is, they extend in the same direction as the shaft 70. Preferably, the air duct 21 between the ventilation ribs 20 and the outer wall of the motor base 10 communicates with the N end and the D end of the motor.

[0028] The above-mentioned permanent magnet traction motor is provided with ventilation ribs 20 on the outer wall of the motor base 10, and the ventilation ribs 20 extend axially. An air duct 21 is formed between the ventilation ribs 20 and the motor base 10, and the air duct 21 is connected with the air gap 60 between the stator and the rotor 51, and is connected with the ventilation holes 52 in the rotor 51. Compared with the design of the existing stator ventilation holes 52, it fully utilizes the external installation space of the motor and reduces the effective volume of the motor; and a cooling water channel 11 is formed on the inner wall circumferential side of the motor base 10, and the air duct 21 and the cooling water channel 11 are respectively located on the inner wall and outer wall of the motor base 10, so that the cooling water channel 11 can cool the circulating air in the air duct 21, thereby improving the heat dissipation efficiency of the motor and reducing the temperature rise rate of the motor.

[0029] In some embodiments, there are multiple ventilation ribs 20, and the multiple ventilation ribs 20 are spaced apart on the outer wall of the motor base 10. In the embodiment of the present application, the multiple ventilation ribs 20 are spaced apart along the circumference of the motor base 10. Each ventilation rib 20 extends axially, and the air duct 21 extends axially. The circulating air in the air duct 21 can exchange heat with the cooling water in the cooling water channel 11 on the inner wall of the motor base 10. The cooling water channel 11 is arranged along the circumference of the motor base 10. The multiple ventilation ribs 20 and the air gap 60 inside the motor base 10 and the ventilation holes 52 of the rotor 51 form more circulation loops, which is beneficial to improving the heat dissipation efficiency of the motor. Refer to Figure 2 The number of the ventilation ribs 20 is 3, and the 3 ventilation ribs 20 are evenly arranged on the outer wall of the motor base 10. That is, the interval between two adjacent ventilation ribs 20 is 120 degrees.

[0030] In some embodiments, the length of the air duct 21 in the axial direction is greater than the length of the cooling water channel 11 in the axial direction. In the embodiment of the present application, the cooling water channel 11 is set as long as possible to facilitate better heat exchange. However, the cooling water channel 11 is located inside the motor base 10, which determines that its length is limited; if it is installed outside the motor base 10, it can be set to a longer length.

[0031] In some embodiments, two ends of the outer wall of the motor base 10 are respectively provided with connecting holes 93 , and the air duct 21 is respectively connected with the air gap 60 and the ventilation hole 52 through the two connecting holes 93 .

[0032] Reference Figure 3 The connecting holes 93 are respectively provided on the pressing rings at both ends of the motor base 10. The connecting holes 93 are axially located outside the cooling water channel 11, that is, the connecting holes 93 are located on the side of the two end covers. The first circulation loop and the second circulation loop are both connected through the connecting holes 93.

[0033] When a turn-to-turn short circuit occurs in the permanent magnet traction motor, high-temperature and high-pressure gas will be generated in both the first circulation loop and the second circulation loop, posing a safety hazard. In some embodiments, the permanent magnet traction motor further includes a pressure regulating valve 30, and pressure regulating valves 30 are provided at both ends of the ventilation rib plate 20 to isolate or connect the air duct 21 to the outside.

[0034] In the present application, refer to Figure 2 , Figure 3 The pressure regulating valve 30 is located at both ends of the ventilation rib 20. Opening the pressure regulating valve 30 can release the high-temperature and high-pressure gas in the motor to the outside of the motor base 10, reduce the high-temperature gas pressure inside the motor base 10, and avoid the expansion of the impact of the permanent magnet motor failure; closing the pressure regulating valve 30 closes the gas release channel, so that the gas continues to circulate in the first circulation loop and the second circulation loop in the motor base 10.

[0035] In some embodiments, the permanent magnet traction motor includes a stator core 41, a winding 42 and a temperature sensor 43. The stator core 41 is arranged in the motor base 10, and the winding 42 is wound on the stator core 41. An insulating paint coating is formed on the surface of the winding 42. One end of the sleeve is closed and located in the nose gap of the winding 42. One end of the temperature sensor 43 is inserted into the sleeve, and the other end extends out of the motor base 10.

[0036] The stator winding 42 is generally connected with a temperature sensor 43, which is fixed in the interlayer insulation of the stator winding 42 before the stator winding 42 is dipped in paint. After the insulating paint is cured, the stator winding 42 and the temperature sensor 43 are covered together by the insulating paint; when the temperature sensor 43 fails, it cannot be replaced.

[0037] In the embodiment of the present application, specifically, a silicone rubber sleeve with one end closed is first inserted into the nose gap of the winding 42 before dipping in paint, the middle of the silicone rubber sleeve is filled with a polytetrafluoroethylene rod, the stator winding 42 is dipped in paint, and the polytetrafluoroethylene rod is taken out after curing, and the temperature sensor 43 is inserted and fixed, so that it can be replaced at any time in case of a fault, thereby improving the temperature protection accuracy and maintainability of the permanent magnet traction motor.

[0038] The permanent magnet traction motor of the embodiment of the present application is provided with a ventilation rib 20 on the outer wall of the motor base 10, the ventilation rib 20 extends axially, and an air duct 21 is formed between the ventilation rib 20 and the motor base 10, and the air duct 21 is connected with the air gap 60 and the ventilation hole 52 in the motor base 10 respectively. Compared with the existing stator ventilation hole 52 design, the external installation space of the motor is fully utilized and the effective volume of the motor is reduced; and a cooling water channel 11 is formed on the inner wall circumference of the motor base 10, and the air duct 21 and the cooling water channel 11 are respectively located on the inner wall and the outer wall of the motor base 10, so that the cooling water channel 11 can cool the circulating air in the air duct 21, thereby improving the heat dissipation efficiency of the motor and reducing the temperature rise rate of the motor. In addition, a temperature sensor 43 is installed after the stator winding 42 is dipped in paint, so that it can be replaced at any time in case of a fault, thereby improving the temperature protection accuracy and maintainability of the permanent magnet traction motor. Third, pressure regulating valves 30 are provided at both ends of the ventilation ribs 20. By opening the pressure regulating valves 30, the high-temperature and high-pressure gas in the motor can be released to the outside of the motor base 10, thereby reducing the high-temperature gas pressure inside the motor base 10 and avoiding the expansion of the impact of permanent magnet motor failure.

[0039] The second aspect of the embodiment of the present application provides a rail vehicle, comprising the permanent magnet traction motor described above. The rail vehicle comprises the permanent magnet traction motor of the embodiment of the present application, and thus has the same effect as the permanent magnet traction motor described above, which will not be described in detail here.

[0040] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A permanent magnet traction motor, characterized in that: It includes a motor base, a rotor, a stator and ventilation ribs, wherein a cooling water channel is formed on the circumferential side of the inner wall of the motor base, the rotor and the stator are both arranged in the motor base, and an air gap is formed therebetween, and ventilation holes are formed in the rotor; the ventilation ribs are arranged on the outer wall of the motor base and extend axially, an air duct is formed between the ventilation ribs and the outer wall of the motor base, and the air duct is respectively connected to the air gap and the ventilation holes.

2. The permanent magnet traction motor according to claim 1, characterized in that: There are multiple ventilation ribs, and the multiple ventilation ribs are arranged at intervals on the outer wall of the motor base.

3. The permanent magnet traction motor according to claim 1, characterized in that: The number of the ventilation ribs is 3, and the 3 ventilation ribs are evenly arranged on the outer wall of the motor base.

4. The permanent magnet traction motor according to claim 1, characterized in that: The length of the air channel in the axial direction is greater than the length of the cooling water channel in the axial direction.

5. The permanent magnet traction motor according to any one of claims 1 to 4, characterized in that: The two ends of the outer wall of the motor base are respectively provided with connecting holes, and the air duct is respectively connected with the air gap and the ventilation hole through the two connecting holes.

6. The permanent magnet traction motor according to claim 5, characterized in that: The permanent magnet traction motor also includes a pressure regulating valve, and the pressure regulating valves are arranged at both ends of the ventilation ribs to isolate or connect the air duct with the outside.

7. The permanent magnet traction motor according to any one of claims 1 to 4, characterized in that: The permanent magnet traction motor includes a stator core, a winding, a sleeve and a temperature sensor. The stator core is arranged in the motor base, the winding is wound on the stator core, and an insulating paint coating is formed on the surface of the winding. One end of the sleeve is closed and located in the nose gap of the winding. One end of the temperature sensor is inserted into the sleeve, and the other end extends out of the motor base.

8. A rail vehicle, comprising the permanent magnet traction motor according to any one of claims 1 to 7.

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