Outer rotor fan blade self-cooling traction structure and traction machine

Abstract

The utility model discloses a traction structure with self-cooling outer rotor fan blades and a traction machine. The traction structure comprises a machine base, a rotating shaft, a stator and a rotor. An annular groove is formed among the outer ring, the middle ring and the end face side wall. A groove opening is exposed in the relative front of the annular groove; an air outlet is formed in the side wall of the end surface; the inner ring is arranged in the middle ring, the middle ring and the inner ring are connected through a plurality of radiating ribs, one end of each radiating rib is connected to the inner ring, and the other end of each radiating rib is connected to the middle ring; the relative rear end of the air inlet hole is exposed out of the outer surface of the base, and the relative front end of the air inlet hole is consistent with the opening direction of the groove; the air inlet hole, the annular groove and the air outlet are sequentially communicated; the rotating shaft is rotatably mounted in the inner ring; the inner ring of the stator is mounted on the outer ring of the middle ring; the rotor is provided with a traction mounting part for mounting a traction wheel; fan blades extending in the radial direction are arranged on one surface of the rotor facing the groove opening; the stator is close to the fan blades. According to the scheme, the problem that the heat dissipation effect is poor due to the fact that an air path is blocked when the traction machine works is solved.

Description

Technical Field

[0001] This utility model relates to the field of traction machines, and in particular to a traction structure and traction machine with a self-cooled external rotor fan blade. Background Technology

[0002] In existing external rotor permanent magnet synchronous traction machines, the stator is completely surrounded by the rotor and the frame, and the permanent magnets are also in a relatively enclosed space. The heat generated by the stator can only be dissipated naturally by conduction from the frame outwards. The internal hot air cannot be actively exhausted to the outside of the casing, resulting in excessively high motor temperature and performance degradation. Based on this, existing technology has designed a method of installing fan blades on the rotor. Several radial fan blades are cast on the inner end face of the rotor, and air inlets are set on the rotor end face. Corresponding air inlets are also set on the frame. When the motor rotates, the fan blades drive the airflow to dissipate heat from the stator. This structure can reduce the motor temperature rise to a certain extent. However, this solution still has the following shortcomings: ① The air inlets are mainly located on the outward side of the rotor, resulting in poor airflow; ② The air inlets are both air inlets and outlets, which significantly reduces the cooling effect and results in poor performance. Utility Model Content

[0003] The purpose of this utility model is to propose a traction structure with a self-cooled external rotor fan blade. It has a rotor with fan blades on one side of the annular groove and an air outlet on the other side of the annular groove. The traction structure has an air inlet inside. The annular groove, air outlet and air inlet are connected in sequence. Without the need to introduce an additional heat dissipation structure, the rotation of the rotor alone can dissipate the heat inside the motor.

[0004] This utility model also proposes a traction machine that uses the above-mentioned traction structure.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A traction structure with self-cooled external rotor fan blades includes: a base, a shaft, a stator, and a rotor;

[0007] The base includes: an outer ring, a middle ring, and an inner ring;

[0008] The outer ring and the middle ring are connected by an end face sidewall, and an annular groove is formed between the outer ring, the middle ring, and the end face sidewall; the annular groove has an exposed opening at the front, and the end face sidewall is provided with an air outlet; the inner ring is disposed inside the middle ring, and the middle ring and the inner ring are connected by multiple heat dissipation ribs, one end of each heat dissipation rib being connected to the inner ring, and the other end being connected to the middle ring; an air inlet is formed between the middle ring, the inner ring, and two adjacent heat dissipation ribs; the air inlet has an exposed end on the outer surface of the base at the rear, and the air inlet has an opening facing the same direction as the groove opening at the front; the air inlet, the annular groove, and the air outlet are connected in sequence.

[0009] The rotating shaft is rotatably mounted on the inner ring, and the inner ring of the stator is mounted on the outer ring of the intermediate ring; the rotor is mounted on the rotating shaft; the outer ring of the rotor is located on the outer ring of the stator, and the rotor covers the slot opening; the rotor is provided with a traction mounting part for mounting a traction sheave;

[0010] The rotor has radially extending fan blades on the side facing the slot opening; the stator end and air inlet are close to the fan blades.

[0011] Optimally, the rotor has an inner end face on the side facing the slot opening; a plurality of fan blades are distributed around the inner end face; a fan blade guide groove is formed between the inner end face and two adjacent fan blades, and the stator end and the air inlet are close to the fan blade guide groove.

[0012] Ideally, the rotor and the shaft are integrally integrated.

[0013] Optimally, one end of the inner ring extends into the area surrounding the plurality of fan blades in the inner end face and is close to the bottom wall of the inner end face, and the fan blade guide groove is disposed adjacent to the air inlet.

[0014] Optimally, the distance between the inner wall of the inner end face and the stator gradually decreases from the inner ring to the outer ring; the inner end face is provided with a plurality of air guide steps distributed in a ring, the air guide steps transition from the inner ring to the outer ring of the inner end face; the air guide steps gradually approach the stator from the inner ring to the outer ring, and adjacent air guide steps are transitioned by air guide slopes.

[0015] Alternatively, some of the fan blades may have an L-shaped notch on the side facing the stator, and the winding end of the stator may extend into the L-shaped notch.

[0016] Optimally, it may also include: a protective shield;

[0017] The protective cover is installed at the air outlet; the surface of the protective cover is provided with ventilation holes.

[0018] Alternatively, the protective cover may be provided with louvers, the louvers having a plurality of downward-facing ventilation holes.

[0019] Optimally, it may also include: a baffle;

[0020] The baffle is installed on the base and covers the air inlet; the baffle is provided with a plurality of the baffle air inlets.

[0021] A traction machine includes: a traction sheave and the aforementioned traction structure with a self-cooled external rotor fan blade; the traction sheave is mounted on the traction mounting part.

[0022] Compared with the prior art, one of the above technical solutions has the following beneficial effects:

[0023] This solution provides a traction structure with a self-cooled external rotor fan blade. It has a rotor with fan blades on one side of the annular groove and an air outlet on the other side of the annular groove. The traction structure has an air inlet inside. The annular groove, air outlet and air inlet are connected in sequence. Without the need to introduce an additional heat dissipation structure, the rotation of the rotor alone can dissipate the heat inside the motor, solving the problem of poor heat dissipation caused by blocked airflow when the traction machine is working. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of one embodiment of a traction machine;

[0025] Figure 2 This is a cross-sectional structural schematic diagram of one embodiment of the traction machine;

[0026] Figure 3 This is a schematic diagram of one embodiment of the rotor and stator configuration;

[0027] Figure 4 yes Figure 3 Enlarged view of section A in the middle;

[0028] Figure 5 This is a structural schematic diagram of one embodiment of the base;

[0029] Figure 6 This is a schematic diagram of one embodiment of the rotor.

[0030] in:

[0031] 1. Frame; 2. Shaft; 3. Stator; 4. Rotor; 5. Protective cover; 6. Traction wheel;

[0032] Outer ring 10; Annular groove 11; Middle ring 12; Groove opening 13; Baffle 14; Air outlet 15; Inner ring 16; Air inlet 17;

[0033] Heat dissipation fins 123; air inlet 17; plate air inlet 141;

[0034] Traction mounting part 21; fan blade 22; inner end face 23; fan blade guide groove 24; guide step 25; guide slope 26; permanent magnet 27; cooling gap 28; L-shaped notch 29; ventilation hole 51. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0036] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "inner side," "outer side," "inner end," "outer end," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" and "second" may explicitly or implicitly include one or more of these features, used to distinguish descriptive features, without any order or emphasis. In the description of this utility model, unless otherwise stated, "multiple" means two or more.

[0037] like Figure 1-6 A traction structure with self-cooled external rotor fan blades includes: a base 1, a rotating shaft 2, a stator 3, and a rotor 4.

[0038] The base 1 includes: an outer ring 10, a middle ring 12, and an inner ring 16;

[0039] The outer ring 10 and the middle ring 12 are connected by an end face sidewall 18, and an annular groove 11 is formed between the outer ring 10, the middle ring 12 and the end face sidewall 18; the annular groove 11 has a groove opening 13 exposed at the front, and the end face sidewall 18 is provided with an air outlet 15; the inner ring 16 is disposed inside the middle ring 12, and the middle ring 12 and the inner ring 16 are connected by a plurality of heat dissipation ribs 123, one end of the heat dissipation rib 123 is connected to the inner ring 16, and the other end of the heat dissipation rib 123 is connected to the middle ring 12; an air inlet 17 is formed between the middle ring 12, the inner ring 16 and two adjacent heat dissipation ribs 123; the air inlet 17 has one end exposed on the outer surface of the base 1 at the rear, and the air inlet 17 has one end facing the groove opening 13 at the front; the air inlet 17, the annular groove 11 and the air outlet 15 are connected in sequence.

[0040] The rotating shaft 2 is rotatably mounted on the inner ring 16, and the inner ring of the stator 3 is mounted on the outer ring of the intermediate ring 12; the rotor 4 is mounted on the rotating shaft 2; the outer ring of the rotor 4 is located on the outer ring of the stator 3, and the rotor 4 covers the slot opening 13; the rotor 4 is provided with a traction mounting part 21 for mounting the traction sheave 6;

[0041] The rotor 4 has a radially extending fan blade 22 on the side facing the slot opening 13; the end of the stator 3 and the air inlet 17 are close to the fan blade 22.

[0042] This solution provides a traction structure with a self-cooled external rotor fan blade. It has a rotor 4 with fan blades 22 on one side of the annular groove 11 and an air outlet 15 on the other side of the annular groove 11. The traction structure has an air inlet 17 inside. The annular groove 11, the air outlet 15, and the air inlet 17 are connected in sequence. Without the need to introduce an additional heat dissipation structure, the rotation of the rotor 4 alone can dissipate the heat inside the motor, solving the problem of poor heat dissipation caused by blocked airflow when the traction machine is working.

[0043] Specifically, the base 1 has an annular groove 11 formed by an outer ring 10 and an intermediate ring 12, and an air inlet 17 is formed between the intermediate ring 12 and the inner ring 16. A rotatable shaft 2 is mounted on the inner ring 16 in a known manner (for example, the shaft 2 is mounted on the inner ring 16 via a bearing), thereby fixing the relative position between the shaft 2 and the inner ring 16. The stator 3 is disposed in the annular groove 11 and fixed to the outer ring of the intermediate ring 12. The rotor 4 may have a traction mounting part 21 on its outer end face, which is used to mount the traction sheave 6. When the rotor 4 rotates relative to the stator 3, it drives the traction sheave 6 and the shaft 2 to rotate. Thus, the outer ring of rotor 4 is located in an annular groove 11, and the end face of rotor 4 can axially cover the groove opening 13 exposed in an annular groove 11, thus isolating the annular groove 11 from the outside and ensuring that foreign objects cannot enter the motor. Based on the relative connection relationship between rotor 4, stator 3 and intermediate ring 12, air inlet 17, stator 3 and rotor 4 are sequentially adjacent from the inner ring to the outer ring. Since rotor 4 covers the groove opening 13, rotor 4 spans across annular groove 11 and air inlet 17 from the outer ring to the inner ring. Fan blades 22 are provided on rotor 4 at groove opening 13 and air inlet 17. When rotor 4 rotates in a certain direction (clockwise or counterclockwise), the air in the fan blade guide groove 24 moves from the inside to the outside under the action of centrifugal force, thereby forming a negative pressure in the area near the inner diameter of fan blade guide groove 24. Under the action of negative pressure, air is drawn in through the air inlet 17 exposed on the outer surface of the base 1. Air enters the fan blade guide groove 24 through the air inlet 17 of the base 1; the heat dissipation fins 123 are connected to the intermediate ring 12, allowing the heat generated by the stator 3 to pass through the intermediate ring 12 and the heat dissipation fins 123, and the cold air fully contacts the outer surface of the intermediate ring 12 and the heat dissipation fins 123, reducing the temperature of the base 1 and carrying away the heat of the stator 3, thus achieving a dual cooling effect; the slot of the inner ring of the fan blade guide groove 24 is infinitely close to the air inlet 17, and the air inlet 17 can guide the air to be transmitted to the fan blade guide groove 24, and the cold air transitions between the inner and outer rings of the fan blade guide groove 24, increasing the air pressure in the outer ring area of ​​the fan blade guide groove 24. Under the action of pressure, the air continues to be transmitted to the cooling gap 28 between the inner wall of the stator 3 and the rotor 4; the air will be discharged outside the annular groove 11 at the air outlet 15, and during the transmission, it will carry away the heat of the base 1, stator 3 and rotor 4, thereby realizing the cooling function when the shaft 2 rotates. In this way, the rotor has the same excellent cooling effect whether it rotates clockwise or counterclockwise in all four directions.

[0044] Optimally, the rotor 4 has an inner end face 23 on the side facing the slot opening 13; a plurality of fan blades 22 are distributed around the inner end face 23; the inner end face 23 and two adjacent fan blades 22 form a fan blade guide groove 24, and the end of the stator 3 and the air inlet 17 are close to the fan blade guide groove 24.

[0045] The outer ring of the rotor 4 is rotatably mounted on the outer ring of the stator 3; the inner end face 23 is provided with multiple radially distributed fan blades 22; the fan blades 22 are arranged radially, with one end of the fan blade 22 located near the center of the inner end face 23, and the other end of the fan blade 22 located away from the center of the inner end face 23. Thus, when two adjacent fan blades 22 are spaced apart, a fan blade guide groove 24 is formed; when the rotor 4 rotates, the fan blade guide groove 24 rotates with the rotor 4, and the air in the fan blade guide groove 24 does work and flows outward under the action of centrifugal force, thereby guiding the air to the end area of ​​the stator 3; when the rotor 4 continues to rotate, the air pressure in the outer diameter area of ​​the fan blade guide groove 24 increases, and the air reaches the air outlet 15 under the action of pressure through the gap 28 between the stator 3 and the rotor, thereby carrying away the heat of the stator 3 and the rotor, achieving a heat dissipation effect. The structure of the fan blade guide groove 24 can guide the air to move in the radial direction, avoid air turbulence, and improve the smoothness and stability of the airflow path.

[0046] The inner ring of rotor 4 is directly or indirectly connected to the shaft 2 located on the inner ring 16; preferably, rotor 4 and shaft 2 are integrally combined. Rotor 4 and shaft 2 can be a detachable assembly; however, in this solution, rotor 4 and shaft 2 are preferably integrally combined, i.e., shaft 2 is integrally combined with the inner end face 23; thus, rotor 4 and shaft 2 do not require a mating connection, simplifying the rotor structure, reducing cost, and making the connection between rotor 4 and shaft 2 tighter and more reliable.

[0047] Optimally, one end of the inner ring 16 extends into the surrounding area of ​​the plurality of fan blades 22 in the inner end face 23 and is close to the bottom wall of the inner end face 23, and the fan blade guide groove 24 is disposed close to the air inlet 17.

[0048] One end of the inner ring 16 can extend into the inner end face 23. The inner ring 16 can be infinitely close to the bottom wall of the inner end face 23. The inner ring 16 has multiple fan blades 22 surrounding the outer periphery of the inner end face 23. The fan blade guide groove 24 is set close to the air inlet 17. After the air is output from the air inlet 17, it directly enters the fan blade guide groove 24, which realizes the short-distance connection of air from the inner ring to the outer ring, further enhancing the stability of the air path and making the traction structure of this solution compact.

[0049] Optimally, the distance between the inner wall of the inner end face 23 and the stator 3 gradually decreases from the inner ring to the outer ring; the inner end face 23 is provided with a plurality of circumferentially distributed air guide steps 25, the air guide steps 25 transition from the inner ring to the outer ring of the inner end face 23; the air guide steps 25 gradually approach the stator 3 from the inner ring to the outer ring, and adjacent air guide steps 25 are transitioned by air guide slopes 26.

[0050] This design further designs the shape of the inner end face 23. The inner wall of the inner end face 23 gradually approaches the outer ring from the inner ring, so that the distance between the inner wall of the inner end face 23 and the stator 3 gradually decreases from the inner ring to the outer ring. In this way, air will diffuse from the inner ring of the inner end face 23 to the outer ring under the action of centrifugal force, and the inner wall of the inner end face 23 will guide the air to be output to the end of the stator 3 at the outer ring position.

[0051] In this design, the inner end face 23 has an air guide ladder 25 on its inner wall, which gradually approaches the stator 3 from the inside to the outside; that is, the air guide ladder 25 near the outer ring is closer to the stator 3 than the air guide ladder 25 near the inner ring. Since the air guide ladder 25 is connected by an air guide slope 26, the air passes through the air guide slope 26 when it transfers between the air guide ladder 25. The air guide slope 26 guides the air to be output to the outermost air guide ladder 25, thereby ensuring that the air path does not change abruptly and achieving the effect of reducing wind resistance. Specifically, the air in the blade air guide slot 24, the air guide ladder 25 and its air guide slope 26 axially face the stator winding part, the cold air changes from radial to axial through the air guide ladder 25 and its air guide slope 26 on the inner wall of the inner end face 23, and then transfers to the cooling gap 28 between the inner wall of the stator 3 and the rotor 4, and is discharged outside the annular groove 11 at the air outlet 15.

[0052] Alternatively, some of the fan blades 22 may have an L-shaped notch 29 on the side facing the stator 3, and the winding end of the stator 3 may extend into the L-shaped notch 29.

[0053] In one embodiment, the fan blade 22 of this design can be designed with an L-shaped notch 29 according to the size of the stator 3; the winding end refers to the part of the stator winding that extends beyond both ends of the iron core; when the winding end of the stator 3 is large, the winding end of the stator can extend into the L-shaped notch 29; the L-shaped notch 29 can reduce the local size of the fan blade 22, thereby reducing the distance between the fan blade guide groove 24 and the stator, which can increase the wind pressure and improve the smoothness of the airflow. The air in the fan blade guide groove 24 flows radially towards the winding end of the stator 3 under the action of centrifugal force, directly dissipating heat to the winding end of the stator 3.

[0054] Optimally, it also includes: a protective shield 5;

[0055] The protective cover 5 is installed on the air outlet 15; the surface of the protective cover 5 is provided with ventilation holes 51.

[0056] The protective cover 5 blocks the entire air outlet 15, and only connects the annular groove 11 to the outside through the ventilation hole 51, so as to ensure that the air in the annular groove 11 can freely enter and exit, and prevent foreign objects from entering or leaving the annular groove 11 through the air outlet 15.

[0057] In some embodiments, the ventilation hole 51 can be a regular-shaped hole structure such as a round hole or a square hole;

[0058] Alternatively, the protective cover 5 may be provided with louvers, and the louvers may be provided with a plurality of downward-facing ventilation holes 51.

[0059] like Figure 1 As shown, the louvers of the protective cover 5 have multiple ventilation holes 51, which face downwards. When foreign objects fall, they are difficult to enter the annular groove 11 through the ventilation holes 51 of the louvers, and the ventilation efficiency is not affected.

[0060] Optimally, it also includes: baffle 14;

[0061] The baffle 14 is installed on the base 1 and covers the air inlet 17; the baffle 14 is provided with a plurality of the plate air inlets 141.

[0062] The baffle 14 is connected to the outside through its air inlet 141, ensuring that air can freely enter and exit the air inlet 17 while preventing foreign objects from entering or exiting the air inlet 17. At the same time, the baffle 14 of this solution can be designed with any number, shape and position of the air inlet 141 as needed, thereby controlling the airflow at the inlet and outlet of the traction structure, so as to better draw in air; therefore, this solution preferably designs the baffle 14 to be detachably installed on the base 1 as needed, and the installation method is such as screw fixing, magnetic fixing, snap fixing, etc., as long as the baffle 14 can be installed.

[0063] The inner wall of the rotor 4 is provided with permanent magnets 27, and multiple permanent magnets 27 are distributed around it. The permanent magnets 27 are located on the outer ring of the stator 3. The fan blades 22, cooling gaps 28, and air outlets 15 are flush. Under pressure, the airflow path passes through the fan blade guide grooves 24, cooling gaps 28, and air outlets 15. The distance between the airflow guide grooves 24 and the air outlets 15 is minimized, resulting in a smoother and more stable airflow path. The heat between the rotor 4 and the stator 3 can be carried away by the air more quickly. A traction machine includes: a traction sheave 6 and the above-mentioned self-cooling traction structure for an outer rotor fan blade; the traction sheave 6 is installed on the traction mounting part 21.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A traction structure with self-cooled external rotor blades, characterized in that, include: Frame, shaft, stator, and rotor; The base includes: an outer ring, a middle ring, and an inner ring; The outer ring and the middle ring are connected by an end face sidewall, and an annular groove is formed between the outer ring, the middle ring, and the end face sidewall; the annular groove has an exposed opening at the front, and the end face sidewall is provided with an air outlet; the inner ring is disposed inside the middle ring, and the middle ring and the inner ring are connected by multiple heat dissipation ribs, one end of each heat dissipation rib being connected to the inner ring, and the other end being connected to the middle ring; an air inlet is formed between the middle ring, the inner ring, and two adjacent heat dissipation ribs; the air inlet has an exposed end on the outer surface of the base at the rear, and the air inlet has an opening facing the same direction as the groove opening at the front; the air inlet, the annular groove, and the air outlet are connected in sequence. The rotating shaft is rotatably mounted on the inner ring, and the inner ring of the stator is mounted on the outer ring of the intermediate ring; the rotor is mounted on the rotating shaft; the outer ring of the rotor is located on the outer ring of the stator, and the rotor covers the slot opening; the side of the rotor facing the slot opening is provided with radially extending fan blades; the stator end and air inlet are close to the fan blades; the rotor is provided with a traction mounting part for mounting a traction sheave.

2. The traction structure with self-cooled external rotor blades according to claim 1, characterized in that, The rotor has an inner end face on the side facing the slot opening; a plurality of fan blades are distributed around the inner end face; a fan blade guide groove is formed between the inner end face and two adjacent fan blades, and the stator is close to the fan blade guide groove.

3. The traction structure with self-cooled external rotor blades according to claim 2, characterized in that, The rotor is integrally combined with the shaft.

4. The traction structure with self-cooled external rotor blades according to claim 3, characterized in that, One end of the inner ring extends into the area surrounding the multiple fan blades in the inner end face and is close to the bottom wall of the inner end face. The fan blade guide groove is arranged close to the air inlet.

5. The traction structure with self-cooled external rotor blades according to claim 2, characterized in that, The distance between the inner wall of the inner end face and the stator gradually decreases from the inner ring to the outer ring; the inner end face is provided with a number of air guide steps distributed in a circle, the air guide steps transition from the inner ring to the outer ring of the inner end face; the air guide steps gradually approach the stator from the inner ring to the outer ring, and adjacent air guide steps are transitioned by air guide slopes.

6. The traction structure with self-cooled external rotor blades according to claim 2, characterized in that, Some of the fan blades have an L-shaped notch on the side facing the stator, and the winding end of the stator extends into the L-shaped notch.

7. A traction structure for self-cooling external rotor fan blades according to any one of claims 1-6, characterized in that, Also includes: Protective shield; The protective cover is installed at the air outlet; the surface of the protective cover is provided with ventilation holes.

8. The traction structure with self-cooled external rotor blades according to claim 7, characterized in that, The protective cover is equipped with louvers, and the louvers have multiple downward-facing ventilation holes.

9. A traction structure for self-cooling external rotor fan blades according to any one of claims 1-6, characterized in that, Also includes: baffle; The baffle is installed on the base and covers the air inlet; the baffle is provided with a plurality of plate air inlets.

10. A traction machine, characterized in that, include: The traction sheave and the traction structure with self-cooled external rotor blades as described in any one of claims 1-9; The traction sheave is mounted on the traction mounting section.

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