Electric Motor

Abstract

The present application relates to an electric motor, comprising: a rotating shaft, a stator, a stator winding, a rotor, a lead wire, a front cover, a rear cover and a fan blade, wherein the front cover, the rear cover and the fan blade are sleeved on the rotating shaft; the front cover is provided with a supporting foot, a front connecting foot and a front vent hole, the supporting foot protrudes outward from the plane of the front cover to form a space for placing the fan blade; the rear cover is provided with a rear connecting foot and a rear vent hole; the fan blade is located in the space formed by the supporting foot and is arranged on the rotating shaft, and when rotating, the fan blade blows air to the inside of the motor through the front vent hole, and the wind blows out from the rear vent hole, thereby forming an air duct; the front connecting foot is connected to the rear connecting foot through a connecting piece, and a gap is left between the front cover and the rear cover after the connection. The motor of the present application can effectively reduce the temperature inside the motor and extend the service life of the motor by blowing air to the inside through the fan blade outside the motor.

Description

Technical Field

[0001] The present application relates to the technical field of electric power equipment, and in particular to an electric motor. Background Art

[0002] Electric motors are widely used in many fields of production and life, for example, in the field of transportation equipment, household appliances, and communications, etc. When used in different fields, the structure and size of the electric motor are different.

[0003] In addition, in some fields, the working environment temperature of the motor is relatively high, and the motor will also generate heat when it is running. The high temperature inside the motor will accelerate the aging of the motor and affect the life of the motor. Summary of the invention

[0004] The present application provides a motor to reduce the temperature inside the motor to a certain extent, thereby extending the life of the motor.

[0005] The present application provides an electric motor, comprising: a rotating shaft, a stator, a stator winding, a rotor, lead wires, a front cover, a rear cover and a fan blade.

[0006] The stator winding is embedded in the stator, the rotor is arranged corresponding to the stator and is sleeved on the rotating shaft, the lead wire is used to connect the power supply, and the front cover, the rear cover and the fan blade are sleeved on the rotating shaft;

[0007] The front end cover is a circular structure, and is provided with a supporting foot, a front connecting foot and a front ventilation hole, the supporting foot protrudes outward from the circumferential surface of the front end cover to form a space for accommodating the fan blade, and the front end cover is connected to the rotating shaft through a front bearing;

[0008] The rear end cover is a circular structure, and is provided with a rear end connecting foot and a rear end ventilation hole, and the rear end cover is connected to the rotating shaft through a rear end bearing;

[0009] The fan blade is located in the space formed by the supporting feet and is arranged on the rotating shaft. When rotating, the fan blade blows air into the interior of the motor through the front ventilation hole, and the air is blown out from the rear ventilation hole.

[0010] The front connecting foot is connected to the rear connecting foot through a connecting piece, and a gap is left between the front cover and the rear cover after the connection.

[0011] Optionally, at least two front-end ventilation holes are evenly and symmetrically arranged with the center of the front-end cover as the center, and at least two rear-end ventilation holes are evenly and symmetrically arranged with the center of the rear-end cover as the center.

[0012] Optionally, the front ventilation holes and the rear ventilation holes are in the shape of fan rings.

[0013] Optionally, the area of ​​the rear ventilation holes is larger than the area of ​​the front ventilation holes.

[0014] Optionally, the electric motor further comprises:

[0015] Front end inner fastener and / or rear end inner fastener;

[0016] The front end inner fastener is arranged between the front end cover and the front end bearing, and the rear end inner fastener is arranged between the rear end cover and the rear end bearing.

[0017] Optionally, the front end inner fastener and / or the rear end inner fastener is a corrugated gasket.

[0018] Optionally, the electric motor further comprises:

[0019] front outer fastener and / or rear outer fastener;

[0020] The front end outer fastener is arranged on a side of the front end bearing away from the front end cover, and the rear end outer fastener is arranged on a side of the rear end bearing away from the rear end cover.

[0021] Optionally, the front end external fastener and / or the rear end external fastener is an E-type retaining spring.

[0022] Optionally, the number of the supporting feet is at least two, the number of the front connecting feet is at least two, the number of the rear connecting feet is at least two, and the number of the rear connecting feet is equal to the number of the front connecting feet and the positions correspond one to one.

[0023] Optionally, the insulation layer of the stator winding is H-class insulation material.

[0024] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0025] A front cover and a rear cover with ventilation holes are respectively arranged at both ends of the stator and the rotor on the motor shaft, and the front and rear covers are connected to form an internal space of the motor, and there is an accommodating space formed by an extended supporting foot on the outer side of the front cover. The fan blades are installed on the shaft in the accommodating space. When the motor starts, the fan blades rotate with the shaft to blow air into the motor. The wind blows in through the ventilation holes of the front cover and blows out from the ventilation holes of the rear cover, forming an air duct to take out part of the heat inside the motor, thereby reducing the temperature inside the motor and extending the life of the motor.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0028] Figure 1 A cross-sectional view of a motor structure provided in an embodiment of the present application.

[0029] Figure 2 An exploded diagram of a motor structure provided in an embodiment of the present application.

[0030] Figure 3 A top view of a motor structure provided in an embodiment of the present application.

[0031] Figure markings: 1-shaft, 2-stator, 3-rotor, 4-stator winding, 5-lead wire, 6-front end cover, 7-rear end cover, 8-blade, 9-connecting piece, 10-front end bearing, 11-rear end bearing, 12-front end inner fastener, 13-rear end inner fastener, 14-front end outer fastener, 15-rear end outer fastener, 16-supporting foot, 17-front end connecting foot, 18-front end ventilation hole, 19-rear end connecting foot, 20-rear end ventilation hole. DETAILED DESCRIPTION

[0032] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0033] Example

[0034] See also Figure 1 , Figure 1 is a cross-sectional view of a motor structure provided in an embodiment of the present application. Figure 1 As shown, the motor provided in this embodiment includes: a rotating shaft 1, a stator 2, a stator winding 4, a rotor 3, a lead wire 5, a front end cover 6, a rear end cover 7 and a fan blade 8; the stator winding 4 is embedded in the stator 2, the rotor 3 is arranged corresponding to the stator 2 and is sleeved on the rotating shaft 1, the lead wire 5 is used to connect the power supply, and the front end cover 6, the rear end cover 7 and the fan blade 8 are sleeved on the rotating shaft.

[0035] Specifically, the stator winding 4 embedded in the stator 2 may adopt a distributed winding, and the rotor 3 may be sleeved on the rotating shaft 1 by interference fit or other methods. The lead wire 5 includes at least a live wire and a neutral wire, and may also include a ground wire to improve the safety factor.

[0036] See also Figure 1 and Figure 2 , Figure 2 It is an exploded view of a motor structure provided in an embodiment of the present application. The front end cover 6 is a circular structure, and is provided with a support foot 16, a front end connecting foot 17 and a front end ventilation hole 18. The support foot 16 protrudes outward from the circumferential surface of the front end cover 6 to form a space for accommodating the fan blade 8. The front end cover 6 is connected to the rotating shaft 1 through the front end bearing 10.

[0037] Specifically, the front end cover 6 is a circular structure, which refers to a view of the front end cover 6, for example, Figure 1 Take the left view as an example, which is approximately a circular structure, that is, considering the whole of the front cover 6, it is approximately a cylindrical structure. The front ventilation hole 18 is located on the plane of the front cover 6 of the cylindrical structure, and the support foot 16 is located on the side of the front cover 6 of the cylindrical structure, and protrudes to the outside of the front cover to form a space for placing the fan blade 8. The outside of the front cover refers to: after installation, the plane where the front ventilation hole 18 is located is bounded, the side away from the rear cover 7 is the outside, and the side close to the rear cover 7 is the inside. In addition to providing space for installing the fan blade 8, the support foot 16 also serves as a connecting structure for connecting the motor to other equipment. Further, the support foot 16 may include a connecting hole. The connection method between the front cover 6 and the front bearing 10 may be: a groove is provided at the center of the inner side of the front cover 6, and the front bearing 10 is tightly embedded in the groove to ensure that it will not slide. The connection method between the front bearing 10 and the rotating shaft 1 may be an interference fit.

[0038] Please continue reading Figure 1 and Figure 2 The rear end cover 7 is a circular structure, and is provided with a rear end connection foot 19 and a rear end ventilation hole 20. The rear end cover 7 is connected to the rotating shaft 1 through a rear end bearing 11. Specifically, the structure of the rear end cover 7 is substantially the same as that of the front end cover 6, except that no support foot is provided on the rear end cover 7. Of course, in other embodiments, the rear end cover may also be provided with a support foot, and those skilled in the art may adjust it according to actual needs.

[0039] Please continue reading Figure 1 and Figure 2 The fan blade 8 is located in the space formed by the supporting foot 16 and is arranged on the rotating shaft 1. When rotating, the wind blows into the interior of the motor through the front ventilation hole 18, and the wind blows out from the rear ventilation hole 20.

[0040] Specifically, the fan blade 8 is detachably arranged on the rotating shaft 1 and becomes an integral part with the rotating shaft 1. When the motor is started, the fan blade 8 rotates with the rotation of the rotating shaft 1. When the fan blade 8 rotates, air is blown into the interior of the motor through the front ventilation hole 18, and the wind is blown out from the rear ventilation hole 20, thereby forming an air duct to bring out the heat inside the motor, thereby reducing the temperature inside the motor and extending the service life of the motor.

[0041] See also Figure 3 , Figure 3 It is a top view of a motor structure provided by an embodiment of the present application. The front connecting foot 17 is connected to the rear connecting foot 19 through the connecting piece 9, and a gap is left between the front cover 6 and the rear cover 7 after the connection. Furthermore, the connecting piece 9 can be a long screw and a nut. There is a gap between the front cover and the rear cover, firstly to make up for the tolerance generated during the casting of the front and rear covers and to ensure the concentricity of the front and rear covers, and secondly, part of the hot air inside the motor can flow out from the gap to accelerate the heat dissipation of the motor.

[0042] The technical solutions provided by the above embodiments of the present application may have the following beneficial effects:

[0043] A front cover and a rear cover with ventilation holes are respectively arranged at both ends of the stator and the rotor on the motor shaft, and the front and rear covers are connected to form an internal space of the motor, and there is an accommodating space formed by an extended supporting foot on the outer side of the front cover. The fan blades are installed on the shaft in the accommodating space. When the motor starts, the fan blades rotate with the shaft to blow air into the motor. The wind blows in through the ventilation holes of the front cover and blows out from the ventilation holes of the rear cover, forming an air duct to take out part of the heat inside the motor, thereby reducing the temperature inside the motor and extending the life of the motor.

[0044] Optionally, in the motor provided by other embodiments of the present application, at least two front ventilation holes 18 are evenly and symmetrically arranged with the center of the circle of the front cover 6 as the center, and at least two rear ventilation holes 20 are evenly and symmetrically arranged with the center of the circle of the rear cover 7 as the center; the front ventilation holes 18 and the rear ventilation holes 20 are in the shape of fan rings; the area of ​​the rear ventilation holes 20 is larger than the area of ​​the front ventilation holes 18. The evenly and symmetrical arrangement of the ventilation holes can ensure that the flow rate and direction of the air blown in by the fan blades are stable, while the air flow direction inside the motor is irregular due to the obstruction and reflection of various components inside the motor, and the area of ​​the rear ventilation holes 20 is set larger than the area of ​​the front ventilation holes 18, which can ensure that the hot air inside the motor is easier to blow out, thereby accelerating the heat dissipation of the motor.

[0045] Optional, see Figure 1 and Figure 2In some other embodiments of the present application, the motor further includes at least one of a front end inner fastener 12 and a rear end inner fastener 13; the front end inner fastener 12 is arranged between the front end cover 6 and the front end bearing 10, and the rear end inner fastener 13 is arranged between the rear end cover 7 and the rear end bearing 11. Furthermore, the front end inner fastener 12 and the rear end inner fastener 13 are corrugated gaskets. The function of the inner fastener is to better prevent the bearing from axially moving toward the side close to the end cover. Specifically, the use of corrugated gaskets can also reduce the impact between the bearing and the end cover and extend the service life.

[0046] Optional, see Figure 1 and Figure 2 In some other embodiments of the present application, the motor further includes at least one of a front end external fastener 14 and a rear end external fastener 15; the front end external fastener 14 is arranged on the side of the front end bearing 10 away from the front end cover 6, and the rear end external fastener 15 is arranged on the side of the rear end bearing 11 away from the rear end cover 7. Further, the front end external fastener 14 and the rear end external fastener 15 are E-type retaining springs. The function of the external fastener is to better prevent the bearing from axially moving to the side away from the end cover, and the E-type retaining spring has a simple structure and good effect, and is often used in mechanical structures.

[0047] Optionally, in the motor provided in some other embodiments of the present application, the number of the supporting legs 16 is at least two, the number of the front connecting legs 17 is at least two, the number of the rear connecting legs 19 is at least two, and the number of the rear connecting legs 19 is equal to the number of the front connecting legs 17 and the positions correspond one to one. For example, Figure 2 The number of the middle support legs 16, the front connection legs 17 and the rear connection legs 19 are all 4. At least two support legs 16 can play a good role in connection and fixing. If only one is provided, rotational dislocation may occur. The reason for providing at least two front connection legs 17 and rear connection legs 19 is the same. The number of rear connection legs is equal to the number of front connection legs and the one-to-one correspondence in position ensures that the front and rear end covers are connected conveniently and accurately.

[0048] Optionally, in the motor provided in some other embodiments of the present application, the insulation layer of the stator winding 4 is an insulation material of Class H. The insulation layer of the stator winding 4 specifically refers to inter-slot insulation, that is, insulation between the stator winding 4 and the stator 2 .

[0049] It should be noted that the insulation material of common motors is generally up to Class F, and the maximum allowable temperature of Class F insulation material is 155°C, while when Class H insulation material is used, the maximum allowable temperature is 180°C. Therefore, motors using Class H insulation materials can work in higher temperature environments, such as some heating equipment or baking equipment, and if the heat dissipation fan blades fail and stop working, using Class H insulation materials can also ensure that the motor is less likely to be damaged by high temperatures.

[0050] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An electric motor, characterized in that: include: A rotating shaft (1), a stator (2), a stator winding (4), a rotor (3), a lead wire (5), a front cover (6), a rear cover (7) and a fan blade (8), The stator winding (4) is embedded in the stator (2), the rotor (3) is arranged corresponding to the stator (2) and is sleeved on the rotating shaft (1), the lead wire (5) is used to connect to a power source, and the front end cover (6), the rear end cover (7) and the fan blade (8) are sleeved on the rotating shaft (1); The front end cover (6) is a circular structure, and is provided with a supporting foot (16), a front connecting foot (17) and a front ventilation hole (18). The supporting foot (16) protrudes outward from the circumferential surface of the front end cover (6) to form a space for accommodating the fan blade (8). The front end cover (6) is connected to the rotating shaft (1) via a front bearing (10); the supporting foot (16) also serves as a connecting structure for connecting the motor to other equipment. The rear end cover (7) is a circular structure, and is provided with a rear end connecting foot (19) and a rear end ventilation hole (20). The rear end cover (7) is connected to the rotating shaft (1) via a rear end bearing (11); The fan blade (8) is located in the space formed by the supporting foot (16) and is detachably arranged on the rotating shaft (1), and blows air into the interior of the motor through the front ventilation hole (18) when rotating, and blows the air out from the rear ventilation hole (20); The front connecting foot (17) is connected to the rear connecting foot (19) via a connecting piece (9), and after the connection, a gap is left between the front cover (6) and the rear cover (7).

2. The electric motor according to claim 1, characterized in that At least two front ventilation holes (18) are evenly and symmetrically arranged with the center of the front cover (6) as the center, and at least two rear ventilation holes (20) are evenly and symmetrically arranged with the center of the rear cover (7) as the center.

3. The electric motor according to claim 1, characterized in that The front ventilation hole (18) and the rear ventilation hole (20) are in the shape of fan rings.

4. The electric motor according to claim 1, characterized in that The area of ​​the rear end ventilation hole (20) is greater than the area of ​​the front end ventilation hole (18).

5. The electric motor according to claim 1, characterized in that Also includes: A front end inner fastener (12) and / or a rear end inner fastener (13); The front end inner fastener (12) is arranged between the front end cover (6) and the front end bearing (10), and the rear end inner fastener (13) is arranged between the rear end cover (7) and the rear end bearing (11).

6. The electric motor according to claim 5, characterized in that The front end inner fastener (12) and / or the rear end inner fastener (13) are corrugated gaskets.

7. The electric motor according to claim 1, characterized in that Also includes: A front end outer fastener (14) and / or a rear end outer fastener (15); The front end outer fastener (14) is arranged on a side of the front end bearing (10) away from the front end cover (6), and the rear end outer fastener (15) is arranged on a side of the rear end bearing (11) away from the rear end cover (7).

8. The electric motor according to claim 7, characterized in that The front end external fastener (14) and / or the rear end external fastener (15) is an E-type clip spring.

9. The electric motor according to claim 1, characterized in that The number of the supporting legs (16) is at least two, the number of the front connecting legs (17) is at least two, the number of the rear connecting legs (19) is at least two, and the number of the rear connecting legs (19) is equal to the number of the front connecting legs (17) and their positions correspond one to one.

10. The electric motor according to claim 1, characterized in that The insulation layer of the stator winding (4) is made of H-class insulation material.

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