Traction machine capable of dissipating heat through traction wheel

Abstract

A traction machine utilizing a traction wheel to dissipate heat relates to the traction machine technology and comprises a permanent magnet synchronous traction machine shell, a stator, a rotor, a rotating shaft and the traction wheel, the traction wheel is fixed on the rotating shaft penetrating out of the permanent magnet synchronous traction machine shell and comprises a supporting sleeve, an outer ring and a plurality of fan blades, and a rope groove is formed in the outer circle surface of the outer ring. The fan blades are evenly distributed around the axis of the rotating shaft and connected between the supporting sleeve and the outer ring, the included angle between the fanning face of each fan blade and the axis of the rotating shaft is an acute angle, wide gaps are formed between the traction wheel and the end face, facing the traction wheel, of the permanent magnet synchronous traction machine shell, and ventilation channels are formed between the fan blades and the wide gaps. Compared with the prior art, the permanent magnet synchronous traction machine has the advantages that the heat dissipation performance is good, the traction wheel is convenient to replace, and the permanent magnet synchronous traction machine can be efficiently cooled without dust entering the traction machine.

Description

Technical Field

[0001] This utility model relates to traction machine technology, and in particular to a permanent magnet synchronous traction machine that utilizes the traction wheel for heat dissipation. Background Technology

[0002] Most existing permanent magnet synchronous traction machines for elevators use natural cooling, which relies on convection heat dissipation through contact between the traction machine casing surface and the air. This inevitably leads to poor heat dissipation, making it difficult to dissipate internal heat. This results in high stator and rotor temperatures, which in turn affect the efficiency, service life, and safety of the permanent magnet synchronous traction machine. To ensure the normal operation of the permanent magnet synchronous traction machine, its design must consider a sufficiently large heat dissipation surface area and a sufficiently large volume. Therefore, the design typically results in a relatively low heat load, a relatively large size, more material consumption, and higher costs. To address this issue, the following technical measures are proposed:

[0003] 1. Forced cooling is achieved by using an external electric fan, but this solution has drawbacks: both the fan control circuit and the fan itself are prone to failure, and a protection circuit is required to prevent fan failure. Therefore, it is rarely used.

[0004] 2. Add ventilation holes to the outer casing of the traction machine and install fan blades inside the rotor. When the rotor rotates, cold air is drawn in and hot air is discharged. The drawback of this solution is that when the rotor is running, external dust can easily enter the permanent magnet synchronous traction machine.

[0005] 3. Chinese patent CN202410250359.8 describes a traction machine with a heat dissipation structure. The design integrates the traction wheel and rotor. The traction wheel consists of spokes, a fixed sleeve, and rope grooves. The spokes are flat plates with internal fan blades and ventilation holes. When the rotor rotates, the fan blades on the plate agitate the air to cool the stator. This design has a certain cooling effect on permanent magnet synchronous traction machines, but it also has the following shortcomings:

[0006] ① The blades are perpendicular to the spoke plate, which limits the axial thrust on the air and the resulting air volume and efficiency.

[0007] ② The plate has ventilation holes, which can easily allow dust and impurities to enter the permanent magnet synchronous traction machine, causing it to malfunction.

[0008] ③ The rotor is suspended and supported on the base, which is only suitable for external rotor structures and cannot be used for internal rotor structures;

[0009] ④ The traction sheave and rotor are designed as one unit. When the traction sheave wears out, both the traction sheave and the rotor must be replaced at the same time, rather than replacing the traction sheave alone. This is because the maintenance cost is high and the maintenance workload is large. Utility Model Content

[0010] The purpose of this invention is to provide a traction machine that utilizes the traction sheave for heat dissipation, has good heat dissipation performance, is easy to replace the traction sheave, and can efficiently cool the permanent magnet synchronous traction machine without allowing dust to enter the traction machine.

[0011] This utility model of a traction machine utilizing a traction sheave for heat dissipation is implemented as follows: It includes a permanent magnet synchronous traction machine housing, a stator and rotor housed within the housing, a rotating shaft rotatably housed within the housing, and a traction sheave fixed to the shaft extending out of the housing. The traction sheave is characterized by a support sleeve, an outer ring with rope grooves on its outer surface, and several fan blades. The fan blades are evenly distributed around the axis of the rotating shaft and connected between the support sleeve and the outer ring. The angle between the fan blades and the axis of the rotating shaft is acute. Several heat dissipation fins are provided on the end face of the permanent magnet synchronous traction machine housing facing the traction sheave. A gap is provided between the traction sheave and the end face of the permanent magnet synchronous traction machine housing facing the traction sheave. The gaps between the fan blades, the heat dissipation fins, and the end face of the traction sheave and the end face of the permanent magnet synchronous traction machine housing facing the traction sheave form ventilation channels.

[0012] During operation, the rotor drives the shaft and traction sheave to rotate. As the traction sheave rotates, because the angle between the fan blades and the shaft axis is acute, when rotating counterclockwise, the air between the fan blades is axially pushed towards the end face of the permanent magnet synchronous traction machine casing facing the traction sheave. When the cold air encounters the end face of the permanent magnet synchronous traction machine casing facing the traction sheave and the heat dissipation fins, it changes direction and moves radially, and is discharged through the gap between the traction sheave and the end face of the permanent magnet synchronous traction machine casing facing the traction sheave. When the traction sheave rotates clockwise, the air between the fan blades is axially pushed towards the opposite direction of the end face of the permanent magnet synchronous traction machine casing facing the traction sheave. A negative pressure is formed between the traction sheave and the end face of the permanent magnet synchronous traction machine casing facing the traction sheave, and cold air flows in from the gap between the traction sheave and the end face of the permanent magnet synchronous traction machine casing facing the traction sheave, and is discharged from the traction sheave through the gap between the fan blades.

[0013] When the permanent magnet synchronous traction machine is working, the heat generated by the stator will be conducted to the permanent magnet synchronous traction machine housing. Whether the traction wheel rotates clockwise or counterclockwise, the fast-flowing cold air will encounter the heat dissipation fins on the end face of the permanent magnet synchronous traction machine housing facing the traction wheel, which will reduce the temperature of the heat dissipation fins and thus reduce the temperature of the stator.

[0014] Because the stator and rotor of the permanent magnet synchronous traction machine are completely surrounded by the permanent magnet synchronous traction machine housing, external dust cannot enter the interior of the traction machine, which can further improve the working reliability of the traction machine. It also has a high level of water resistance and is splash-proof. On the other hand, the traction sheave is installed on the shaft that extends out of the permanent magnet synchronous traction machine housing, making it easy to replace and disassemble when the traction sheave is worn. Moreover, it has a simple structure, small size, and low manufacturing cost.

[0015] Preferably, the heat dissipation fins on the end face of the permanent magnet synchronous traction machine housing facing the traction wheel are arranged in a radial pattern. This increases the heat dissipation area of ​​the permanent magnet synchronous traction machine housing, and the space between the heat dissipation fins forms a ventilation channel that can quickly exhaust or draw in the air, thereby improving the cooling effect of the cooling air. In addition, it can increase the strength of the permanent magnet synchronous traction machine housing and improve mechanical reliability.

[0016] Preferably, the stator is fixed to a fixing member inside the permanent magnet synchronous traction machine housing, and the fixing member is connected to the end face of the permanent magnet synchronous traction machine housing facing the traction sheave as a whole. When the permanent magnet synchronous traction machine is working, the heat generated by the stator can be directly conducted to the end face of the permanent magnet synchronous traction machine housing facing the traction sheave through the fixing member, and then carried away by the cooling air blown by the fan blades on the traction sheave, thereby ensuring the heat dissipation efficiency.

[0017] Compared with existing technologies, this invention has the advantages of good heat dissipation performance, convenient replacement of traction sheave, and efficient cooling of permanent magnet synchronous traction machine without dust entering the traction machine. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the traction machine utilizing the traction wheel for heat dissipation according to Embodiment 1 of this utility model;

[0019] Figure 2 yes Figure 1 Exploded view;

[0020] Figure 3 yes Figure 1 Sectional view;

[0021] Figure 4 for Figure 3 AA section view;

[0022] Figure 5 This is a schematic diagram of the structure of the traction machine utilizing the traction wheel for heat dissipation in Embodiment 2 of this utility model;

[0023] Figure 6 This is a schematic diagram of the structure of the traction machine utilizing the traction wheel for heat dissipation, according to Embodiment 3 of this utility model;

[0024] Figure 7 This is a schematic diagram of the structure of the traction machine utilizing the traction wheel for heat dissipation, which is embodiment 4 of this utility model.

[0025] Labeling Explanation: 1-Permanent magnet synchronous traction machine housing; 101-End face; 102-Cylindrical stator cavity; 103-First base; 104-First rear end cover; 105-First front end cover; 106-Second base; 107-Third base; 108-Second rear end cover; 109-Second front end cover; 110-Fourth base; 2-Stator; 3-Rotor; 4-Shaft; 5-Traction wheel; 501-Support sleeve; 502-Rope groove; 503-Outer ring; 504-Fan blade; 6-Heat dissipation fin; 7-Fixing component; 8-Front bearing housing; 9-Rear bearing housing; 10-Circular plate-shaped connector; 1001-Fixing ring. Detailed Implementation

[0026] The present invention, a traction machine utilizing a traction sheave for heat dissipation, will now be described in further detail with reference to the accompanying drawings and embodiments:

[0027] Example 1: As Figure 1-4 As shown, the traction machine of this utility model, which utilizes a traction sheave for heat dissipation, includes a permanent magnet synchronous traction machine housing 1, a stator 2 and a rotor 3 disposed within the housing 1, a rotating shaft 4 rotatably disposed within the housing 1, and a traction sheave 5 fixed on the rotating shaft 4 extending out of the housing 1. The traction sheave 5 is characterized by including a support sleeve 501, an outer ring 503 with rope grooves 502 on its outer surface, and several fan blades 504, the fan blades 504 being evenly distributed around the axis B of the rotating shaft 4. Distributed and connected between the support sleeve 501 and the outer ring 503, the fan surface of the fan blade 504 forms an acute angle with the axis B of the rotating shaft 4. Several heat dissipation fins 6 are provided on the end face 101 of the permanent magnet synchronous traction machine housing 1 facing the traction wheel 5. A gap is provided between the traction wheel 5 and the end face 101 of the permanent magnet synchronous traction machine housing 1 facing the traction wheel 5. The gaps between the fan blades 504, between the heat dissipation fins 6, and between the traction wheel 5 and the end face 101 of the permanent magnet synchronous traction machine housing 1 facing the traction wheel 5 form a ventilation channel.

[0028] Preferably, the heat dissipation fins 6 on the end face 101 of the permanent magnet synchronous traction machine housing 1 facing the traction wheel 5 are arranged in a radial pattern.

[0029] Preferably, the stator 2 is fixed on the fixing member 7 inside the housing 1 of the permanent magnet synchronous traction machine, and the fixing member 7 is connected to the end face 101 of the housing 1 of the permanent magnet synchronous traction machine facing the traction wheel 5 to form a whole.

[0030] Preferably, the permanent magnet synchronous traction machine housing 1 includes a first base 103 with a cylindrical stator cavity 102 whose outer surface is an end face 101, and a first rear end cover 104. The first rear end cover 104 is fixedly connected to the rear opening of the cylindrical stator cavity 102 of the first base 103 by screws. The first base 103 is provided with a front bearing seat 8, and the first rear end cover 104 is provided with a rear bearing seat 9. The front end of the front bearing seat 8 protrudes outside the end face 101, and the end of the heat dissipation fin 6 is connected to the protruding end face 101 of the front bearing seat 8. At the front end, one end of the ventilation channel between the heat dissipation fins 6 is closed to allow the cooling air to be discharged smoothly. The fixing component 7 is a stator fixing ring. The fixing component 7 is set on the first base 103 behind the end face 101. The stator 2 is sleeved and fixed on the fixing component 7. The rotor 3 is an outer rotor. The rotor 3 is sleeved and rotatably set on the stator 2 inside the cylindrical stator cavity 102. The rotor 3 is fixedly connected to the rear end of the rotating shaft 4 in front of the rear bearing seat 9 through a circular plate-shaped connector 10 with a fixing ring 1001 fixed on the rotating shaft 4.

[0031] Example 2: Figure 5 As shown, this embodiment is based on embodiment 1. The permanent magnet synchronous traction machine housing 1 includes a first front end cover 105 with an outer end face 101 and a second base 106 with a cylindrical stator cavity 102. The first front end cover 104 is fixedly connected to the front opening of the cylindrical stator cavity 102 of the second base 106 by screws. The front bearing seat 8 is disposed on the first front end cover 105, and the rear bearing seat 9 is disposed on the second base 106. The front end of the front bearing seat 8 protrudes out of the end face 101, and the end of the heat dissipation fin 6 is connected to the front bearing seat 8. On the front end outside the end face 101, one end of the ventilation channel between the heat dissipation fins 6 is closed to allow the cooling air to be discharged smoothly. The fixing component 7 is a stator fixing ring. The fixing component 7 is set on the first front end cover 105 behind the end face 101. The stator 2 is sleeved and fixed on the fixing component 7. The rotor 3 is an outer rotor. The rotor 3 is sleeved and rotatably set on the stator 2 inside the cylindrical stator cavity 102. The rotor 3 is fixedly connected to the rear end of the shaft 4 in front of the rear bearing seat 9 through a circular plate-shaped connector 10 with a fixing ring 1001 fixed on the shaft 4.

[0032] Example 3: Figure 6As shown, this embodiment is based on embodiment 1. The permanent magnet synchronous traction machine housing 1 includes a third base 107 with a cylindrical stator cavity 102 on the outer side end face 101 and a second rear end cover 108. The second rear end cover 108 is fixedly connected to the rear end opening of the cylindrical stator cavity 102 of the third base 107 by screws. The front bearing seat 8 is disposed on the third base 107 and the rear bearing seat 9 is disposed on the second rear end cover 108. The front end of the front bearing seat 8 protrudes outside the end face 101. The end of the heat dissipation fin 6 is connected to the front end of the front bearing seat 8 protruding outside the end face 101, so that one end of the ventilation channel between the heat dissipation fins 6 is closed, so that the cooling air can be smoothly discharged. The fixing member 7 is the side wall of the cylindrical stator cavity 102. The stator 2 is fixed on the inner wall of the fixing member 7. The rotor 3 is the inner rotor and is fixed on the rotating shaft 4.

[0033] Example 4: Figure 7 As shown, this embodiment is based on embodiment 1. The permanent magnet synchronous traction machine housing 1 includes a second front end cover 109 with a cylindrical stator cavity 102 on the outer side end face 101 and a fourth base 110. The second front end cover 109 is fixedly connected to the front opening of the cylindrical stator cavity 102 of the fourth base 110 by screws. The front bearing seat 8 is disposed on the second front end cover 109, and the rear bearing seat 9 is disposed on the fourth base 110. The front end of the front bearing seat 8 protrudes out of the end face 101. The end of the heat dissipation fin 6 is connected to the front end of the front bearing seat 8 protruding out of the end face 101, so that one end of the ventilation channel between the heat dissipation fins 6 is closed, so that the cooling air can be smoothly discharged. The fixing member 7 is the side wall of the cylindrical stator cavity 102. The stator 2 is fixed on the inner wall of the fixing member 7. The rotor 3 is the inner rotor and is fixed on the rotating shaft 4.

Claims

1. A traction machine utilizing a traction sheave for heat dissipation, comprising a permanent magnet synchronous traction machine housing, a stator and rotor disposed within the permanent magnet synchronous traction machine housing, a rotating shaft rotatably disposed within the permanent magnet synchronous traction machine housing, and a traction sheave fixed on the rotating shaft extending outside the permanent magnet synchronous traction machine housing, characterized in that, The traction sheave includes a support sleeve, an outer ring with rope grooves on its outer surface, and several fan blades. The fan blades are evenly distributed around the axis of rotation and connected between the support sleeve and the outer ring. The angle between the fan surface of the fan blades and the axis of rotation is an acute angle. Several heat dissipation fins are provided on the end face of the permanent magnet synchronous traction machine housing facing the traction sheave. A gap is provided between the traction sheave and the end face. The gaps between the fan blades, between the heat dissipation fins, and between the traction sheave and the end face of the permanent magnet synchronous traction machine housing facing the traction sheave form ventilation channels.

2. The traction machine utilizing a traction sheave for heat dissipation according to claim 1, characterized in that, The heat dissipation fins on the end face of the permanent magnet synchronous traction machine housing facing the traction wheel are arranged in a radial pattern.

3. The traction machine utilizing a traction sheave for heat dissipation according to claim 1 or 2, characterized in that, The stator is fixed on a fixed component inside the housing of the permanent magnet synchronous traction machine. The fixed component is connected to the end face of the housing of the permanent magnet synchronous traction machine facing the traction wheel as a whole.

4. The traction machine utilizing a traction sheave for heat dissipation according to claim 3, characterized in that, The permanent magnet synchronous traction machine housing includes a first base with a cylindrical stator cavity on its outer side end face and a first rear end cover. The first rear end cover is fixedly connected to the rear end opening of the cylindrical stator cavity of the first base by screws. The first base is provided with a front bearing seat, and the first rear end cover is provided with a rear bearing seat. The front end of the front bearing seat protrudes out of the end face, and the end of the heat dissipation fin is connected to the front end of the front bearing seat protruding out of the end face, so that one end of the ventilation channel between the heat dissipation fins is closed, allowing the cooling air to be discharged smoothly. The fixing component is a stator fixing ring, which is set on the first base behind the end face. The stator is sleeved and fixed on the fixing component. The rotor is an outer rotor, which is sleeved and rotatably mounted on the stator inside the cylindrical stator cavity. The rotor is fixedly connected to the rear end of the shaft in front of the rear bearing seat by a circular plate-shaped connector with a fixing ring fixed on the shaft.

5. The traction machine utilizing a traction sheave for heat dissipation according to claim 3, characterized in that, The permanent magnet synchronous traction machine housing includes a first front end cover whose outer surface is an end face and a second base with a cylindrical stator cavity. The first front end cover is fixedly connected to the front opening of the cylindrical stator cavity of the second base by screws. A front bearing housing is set on the first front end cover, and a rear bearing housing is set on the second base. The front end of the front bearing housing protrudes out of the end face, and the end of the heat dissipation fin is connected to the front end of the front bearing housing that protrudes out of the end face, so that one end of the ventilation channel between the heat dissipation fins is closed, allowing the cooling air to be discharged smoothly. The fixing component is a stator fixing ring, which is set on the first front end cover behind the end face. The stator is sleeved and fixed on the fixing component. The rotor is an outer rotor, which is sleeved and rotatably set on the stator inside the cylindrical stator cavity. The rotor is fixedly connected to the rear end of the shaft in front of the rear bearing housing by a circular plate-shaped connector with a fixing ring fixed on the shaft.

6. The traction machine utilizing a traction sheave for heat dissipation according to claim 3, characterized in that, The permanent magnet synchronous traction machine housing includes a third base with a cylindrical stator cavity on its outer side and a second rear end cover. The second rear end cover is fixedly connected to the rear end opening of the cylindrical stator cavity of the third base by screws. The front bearing housing is set on the third base, and the rear bearing housing is set on the second rear end cover. The front end of the front bearing housing protrudes out of the end face, and the end of the heat dissipation fin is connected to the front end of the front bearing housing that protrudes out of the end face, so that one end of the ventilation channel between the heat dissipation fins is closed, allowing the cooling air to be discharged smoothly. The fixing component is the side wall of the cylindrical stator cavity, and the stator is fixed on the inner wall of the fixing component. The rotor is an inner rotor, and the rotor is fixed on the rotating shaft.

7. The traction machine utilizing a traction sheave for heat dissipation according to claim 3, characterized in that, The permanent magnet synchronous traction machine housing includes a second front end cover with a cylindrical stator cavity on its outer side and a fourth base. The second front end cover is fixedly connected to the front opening of the cylindrical stator cavity of the fourth base by screws. The front bearing housing is set on the second front end cover, and the rear bearing housing is set on the fourth base. The front end of the front bearing housing protrudes out of the end face, and the end of the heat dissipation fin is connected to the front end of the front bearing housing that protrudes out of the end face, so that one end of the ventilation channel between the heat dissipation fins is closed, allowing the cooling air to be discharged smoothly. The fixing component is the side wall of the cylindrical stator cavity, and the stator is fixed on the inner wall of the fixing component. The rotor is an inner rotor, and the rotor is fixed on the rotating shaft.

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