An air-cooled electric motor

Abstract

The present invention relates to the field of motor technology, and specifically to an air-cooled electric motor, comprising an internal air-drive component, an external air-drive component, a rotor, a stator, an end cover, a bearing outer cover, and a bearing. The rotor core is provided with a rotor core ventilation duct, and the outer surface of the base is provided with heat dissipation fins and a W-shaped heat dissipation duct. The direction of the air flow inside the motor is to be sucked in from the supercharged check device, pass through the rotor core ventilation duct and the guide device, and then the wind wheel drives the air flow to the W-shaped heat dissipation duct for heat dissipation and then returns to the supercharged check device for recirculation; the direction of the air flow outside the motor is to be sucked in from the air inlet of the wind cover, and the fan drives the air flow to the supercharged air guide shell, the air outlet of the rear end cover, and flows to the heat dissipation fins and the outside of the W-shaped heat dissipation duct. The motor air-cooling system manufactured by adopting this technical solution is simple, low-cost, and has uniform heat dissipation. By optimizing the circulation of the internal air duct and enhancing the wind pressure of the external air duct, the problems of high temperature of the motor shaft end coil and the internal temperature of the shaft end bearing are solved, and the performance of the air-cooled motor is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an air-cooled motor. Background Art

[0002] Currently, there are three main approaches to electric motor thermal management: air cooling, liquid cooling, and air-liquid combined cooling. Each approach has its own advantages. Air cooling systems offer the advantages of simple structure, high reliability, and low cost, and are primarily used in low-power motors with low heat generation and high reliability requirements. Therefore, air cooling systems have gained widespread application in the field of low-power motor cooling due to their low cost, high reliability, and easy installation. The cooling efficiency of air cooling systems is primarily determined by factors such as fin structural parameters, gas channel distribution, gas flow rate, cooling medium, and the thermal emissivity of the casing surface. To enhance the comprehensive advantages of air-cooled motors among various cooling types, motor research institutes and motor manufacturers using air cooling technology must increase innovation in motor air cooling technology to develop customer-satisfied air-cooled motors. Summary of the Invention

[0003] In view of the shortcomings of existing technologies and products, the purpose of the present invention is to provide an air-cooled motor to overcome the problems raised in the background technology, thereby developing and manufacturing a motor that meets the requirements of the background technology.

[0004] In order to solve the above technical problems, the technical solution of the present invention is as follows: an air-cooled motor includes an inner air-driving assembly, an outer air-driving assembly, a rotor, a stator, an end cover, a bearing outer cover, and a bearing;

[0005] The rotor is composed of a rotor winding, a rotor core, and a motor shaft assembly. The motor shaft assembly is provided with a shaft extension end and a rotor core shaft seat. A star through hole and a planetary through hole are provided on the cross section of the rotor core. There are multiple planetary through holes, all of which are ventilation channels for the rotor core. The ends of the planetary through holes far from the shaft extension serve as the air inlet of the rotor core, and the ends of the planetary through holes near the shaft extension serve as the air outlet of the rotor core. The motor shaft assembly is inserted into the star through holes from the shaft extension end and cooperates with the rotor core shaft seat.

[0006] The stator is composed of a stator core with a winding and a machine base. The stator core with a winding is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the machine base. The outer surface of the machine base is provided with heat dissipation fins and a W-shaped heat dissipation duct. There are multiple W-shaped heat dissipation ducts arranged in an axial direction. The W-shaped heat dissipation duct is provided with an air inlet on the inner wall of the machine base and an air outlet on the inner wall of the machine base. The air inlet on the inner wall of the machine base and the air outlet on the inner wall of the machine base are respectively arranged at two ends of the W-shaped heat dissipation duct. The air inlet on the inner wall of the machine base and the air outlet on the inner wall of the machine base are both arranged on the inner wall of the machine base. The air inlet on the inner wall of the machine base is arranged near the shaft extension end, and the air outlet on the inner wall of the machine base is arranged far from the shaft extension end.

[0007] There are two end covers, one is a front end cover, and the other is a rear end cover. The front end of the base is fixedly connected to the front end cover, and the rear end of the base is fixedly connected to the rear end cover. The shaft holes of the front end cover and the rear end cover are both provided with bearings, and the bearings are respectively sleeved on the shaft necks at both ends of the motor shaft assembly. The bearing outer cover is installed on the side of each end cover facing away from the base.

[0008] The inner wind driving assembly is composed of a guide device, a wind collecting wheel, and a supercharging check device. The guide device is adjacent to the rotor core, the guide device is fixedly connected to the motor shaft assembly, the guide device is located between the rotor core and the front end cover, the wind collecting wheel is adjacent to the guide device, the wind collecting wheel is fixedly connected to the motor shaft assembly and is located between the guide device and the front end cover, and the supercharging check device is fixedly connected to the motor shaft assembly and is located between the rotor core and the rear end cover;

[0009] The external wind drive assembly consists of a fan, a boost air guide shell, and a wind cover. The fan is fixedly connected to the non-extended end of the motor shaft assembly and is located on the outside of the rear end cover. The boost air guide shell is fixedly connected to the wind cover and is located inside the wind cover. The wind cover is fixedly connected to the rear end cover.

[0010] In the air-cooled motor described in the present invention, the rotor core is provided with six rotor core ventilation ducts, each of the rotor core ventilation ducts is conical in the axial direction, the diameter of the rotor core air inlet is larger than the diameter of the rotor core air outlet, and the distance between each rotor core air inlet and the central axis of the motor shaft assembly is smaller than the distance between the rotor core air outlet and the central axis of the motor shaft assembly.

[0011] In the air-cooled motor described in the present invention, six W-shaped heat dissipation ducts are provided and evenly distributed on the same circumference, with the double openings of the W-shape facing away from the base, and the W-shaped heat dissipation ducts are only connected to the interior of the motor.

[0012] In the air-cooled motor described in the present invention, the rear end cover is provided with 12 fixing holes and 12 rear end cover air outlets, the fixing holes are used to connect the rear end cover to the base, and the wind cover completely covers the rear end cover air outlets.

[0013] In the air-cooled motor described in the present invention, the cooling airflow direction of the motor's internal ventilation and heat dissipation system is sucked in from the boost check device, passes through the rotor core air inlet, the rotor core ventilation duct, the rotor core air outlet, and the guide device, and is driven by the wind collecting wheel to flow to the base inner wall air inlet, the W-shaped heat dissipation duct, the base inner wall air outlet, and the boost check device; the cooling airflow direction of the motor's external ventilation and heat dissipation system is sucked in from the wind cover air inlet, driven by the fan to flow to the boost air guide shell, passes through the rear end cover outlet, and flows to the heat dissipating fins and the outside of the W-shaped heat dissipation duct.

[0014] Compared with the existing technology, the beneficial effects of the present invention are: the motor air cooling system manufactured by adopting this technical solution is simple, low-cost, and has uniform heat dissipation. By optimizing the circulation of the internal air path and enhancing the wind pressure of the external air path, the problems of high temperature of the motor shaft end coil and the internal temperature of the shaft end bearing are solved, and the performance of the air-cooled motor is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0016] Figure 1 This is a schematic structural diagram of the air-cooled motor of the present invention;

[0017] Figure 2 It is a schematic diagram of the internal and external airflow routes of the present invention;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the motor at the air inlet of the rotor core of the present invention;

[0019] Figure 4 This is a schematic diagram of the cross-sectional structure of the motor at the air outlet of the rotor core of the present invention;

[0020] Figure 5 It is the right view of the rear end cover of the present invention.

[0021] The corresponding names of the reference numerals in the accompanying drawings are as follows:

[0022] Motor shaft assembly, 2-rotor winding, 3-rotor core, 4-stator core with winding, 5-base, 6-bearing outer cover, 7-bearing, 8-front cover, 9-rear cover, 10-boost air guide shell, 11-fan, 12-wind cover, 20-wind collecting wheel, 21-guide device, 22-boost check device, 30-internal air flow direction, 31-external air flow direction, 51-base front end, 52-heat dissipation fins, 53-base inner wall air inlet, 54-W-type heat dissipation duct, 55-base inner wall air outlet, 91-fixing hole, 92-rear cover air outlet, 301-rotor core ventilation duct, 302-rotor core air inlet, 303-rotor core air outlet. DETAILED DESCRIPTION

[0023] To further illustrate the technical means and effects of the present invention to achieve the above-mentioned objectives, the following detailed description of the specific embodiments, structures, features and effects of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described in the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0024] like Figures 1 to 5The air-cooled motor of the embodiment of the present invention shown includes an inner air drive component, an outer air drive component, a rotor, a stator, an end cover, a bearing outer cover 6, and a bearing 7; the rotor is composed of a rotor winding 2, a rotor core 3, and a motor shaft assembly 1, and the motor shaft assembly 1 is provided with an axial extension end and a rotor core shaft seat, and a star through hole and a planetary through hole are provided on the cross section of the rotor core 3, and the planetary through holes are provided with multiple and all rotor core ventilation ducts 301, the far end of the planetary through hole from the axial extension is the rotor core air inlet 302, and the near end of the planetary through hole from the axial extension is the rotor core air outlet 303, and the motor shaft assembly 1 is inserted into the star through hole from the axial extension end and cooperates with the rotor core shaft seat; The stator is composed of a stator core 4 with a winding and a base 5. The stator core 4 with a winding is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the base 5. The base 5 is provided with heat dissipation fins 52 and a W-shaped heat dissipation duct 54 on the outside. There are multiple W-shaped heat dissipation ducts 54 arranged in an axial direction. The W-shaped heat dissipation duct 54 is provided with an inner wall air inlet 53 of the base and an inner wall air outlet 55 of the base. The inner wall air inlet 53 of the base and the inner wall air outlet 55 of the base are respectively arranged at both ends of the W-shaped heat dissipation duct 54. The inner wall air inlet 53 of the base and the inner wall air outlet 55 of the base are both arranged on the inner wall of the base 5. The inner wall air inlet 53 of the base is arranged near the inner wall of the base. The shaft extension end and the air outlet 55 on the inner wall of the base are arranged at the far end of the shaft extension end; the end covers are provided with two, one is the front end cover 8, and the other is the rear end cover 9, the front end 51 of the base is fixedly connected to the front end cover 8, and the rear end of the base is fixedly connected to the rear end cover 9, the shaft holes of the front end cover 8 and the rear end cover 9 are provided with the bearings 7, and the bearings 7 are respectively sleeved on the two end journals of the motor shaft assembly 1, and the side of each end cover facing away from the base 5 is provided with the bearing outer cover 6; the internal wind drive assembly is composed of a guide device, a wind collecting wheel, and a boost check device, the guide device 21 is adjacent to the rotor core 3, the guide device 21 is fixedly connected to the motor shaft assembly 1, the guide device The device 21 is located between the rotor core 3 and the front end cover 8, the wind collecting wheel 20 is adjacent to the guide device 21, the wind collecting wheel 20 is fixedly connected to the motor shaft assembly 1 and is located between the guide device 21 and the front end cover 8, the boost check device 22 is fixedly connected to the motor shaft assembly 1 and is located between the rotor core 3 and the rear end cover 9; the external wind driving component is composed of a fan 11, a boost air guide shell 10, and a wind cover 12, the fan 11 is fixedly connected to the non-axial extension end of the motor shaft assembly 1 and is located on the outside of the rear end cover 9, the boost air guide shell 10 is fixedly connected to the wind cover 12 and is located inside the wind cover 12, and the wind cover 12 is fixedly connected to the rear end cover 9.

[0025] like Figures 1 to 4As shown, in this embodiment, the rotor core 3 is provided with six rotor core ventilation ducts 301, each of the rotor core ventilation ducts 301 is tapered in the axial direction, the diameter of the rotor core air inlet 302 is larger than the diameter of the rotor core air outlet 303, and the distance between each rotor core air inlet 302 and the central axis of the motor shaft assembly 1 is smaller than the distance between the rotor core air outlet 303 and the central axis of the motor shaft assembly 1.

[0026] like Figures 1 to 4 As shown, in this embodiment, there are six W-shaped heat dissipation ducts 54 and they are evenly distributed on the same circumference, with the double openings of the W-shape facing away from the base 5 , and the W-shaped heat dissipation ducts 54 are only connected to the interior of the motor.

[0027] like Figure 1 、 Figure 2 、 Figure 5 As shown, in this embodiment, the rear end cover 9 is provided with 12 fixing holes 91 and 12 rear end cover air outlets 92 , the fixing holes 91 are used to connect the rear end cover 9 to the base 5 , and the wind cover 12 completely covers the rear end cover air outlets 92 .

[0028] like Figure 2 As shown, in this embodiment, the cooling airflow direction of the internal ventilation and heat dissipation system of the motor is sucked in from the boost check device 22, passes through the rotor core air inlet 302, the rotor core ventilation duct 301, the rotor core air outlet 303, and the guide device 21, and is driven by the wind collecting wheel 20 to flow to the inner wall air inlet 53 of the machine base, the W-shaped heat dissipation duct 54, the inner wall air outlet 55 of the machine base, and the boost check device 22; the cooling airflow direction of the external ventilation and heat dissipation system of the motor is sucked in from the air inlet of the wind cover 12, driven by the fan 11 to flow to the boost air guide shell 10, passes through the rear end cover air outlet 92, and flows to the outside of the heat dissipation fins 52 and the W-shaped heat dissipation duct 54.

[0029] The above-mentioned Figures 1 to 5 The embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent or similar changes made based on the principles, shapes, and structures of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air-cooled motor, characterized in that: Including inner wind driving assembly, outer wind driving assembly, rotor, stator, end cover, bearing outer cover, and bearing; The rotor is composed of a rotor winding, a rotor core, and a motor shaft assembly. The motor shaft assembly is provided with a shaft extension end and a rotor core shaft seat. A star through hole and a planetary through hole are provided on the cross section of the rotor core. There are multiple planetary through holes, all of which are ventilation channels for the rotor core. The ends of the planetary through holes far from the shaft extension serve as the air inlet of the rotor core, and the ends of the planetary through holes near the shaft extension serve as the air outlet of the rotor core. The motor shaft assembly is inserted into the star through holes from the shaft extension end and cooperates with the rotor core shaft seat. The stator is composed of a stator core with a winding and a machine base. The stator core with a winding is composed of a stator winding and a stator core. The stator winding is installed on the stator core, and the stator core is installed in the machine base. The outer surface of the machine base is provided with heat dissipation fins and a W-shaped heat dissipation duct. There are multiple W-shaped heat dissipation ducts arranged in an axial direction. The W-shaped heat dissipation duct is provided with an air inlet on the inner wall of the machine base and an air outlet on the inner wall of the machine base. The air inlet on the inner wall of the machine base and the air outlet on the inner wall of the machine base are respectively arranged at two ends of the W-shaped heat dissipation duct. The air inlet on the inner wall of the machine base and the air outlet on the inner wall of the machine base are both arranged on the inner wall of the machine base. The air inlet on the inner wall of the machine base is arranged near the shaft extension end, and the air outlet on the inner wall of the machine base is arranged far from the shaft extension end. There are two end covers, one is a front end cover, and the other is a rear end cover. The front end of the base is fixedly connected to the front end cover, and the rear end of the base is fixedly connected to the rear end cover. The shaft holes of the front end cover and the rear end cover are both provided with bearings, and the bearings are respectively sleeved on the shaft necks at both ends of the motor shaft assembly. The bearing outer cover is installed on the side of each end cover facing away from the base. The inner wind driving assembly is composed of a guide device, a wind collecting wheel, and a supercharging check device. The guide device is adjacent to the rotor core, the guide device is fixedly connected to the motor shaft assembly, the guide device is located between the rotor core and the front end cover, the wind collecting wheel is adjacent to the guide device, the wind collecting wheel is fixedly connected to the motor shaft assembly and is located between the guide device and the front end cover, and the supercharging check device is fixedly connected to the motor shaft assembly and is located between the rotor core and the rear end cover; The external wind drive assembly consists of a fan, a boost air guide shell, and a wind cover. The fan is fixedly connected to the non-extended end of the motor shaft assembly and is located on the outside of the rear end cover. The boost air guide shell is fixedly connected to the wind cover and is located inside the wind cover. The wind cover is fixedly connected to the rear end cover.

2. The air-cooled motor according to claim 1, characterized in that: The rotor core is provided with six rotor core ventilation ducts, each of which is conical in the axial direction. The diameter of the rotor core air inlet is larger than the diameter of the rotor core air outlet. The distance between each rotor core air inlet and the central axis of the motor shaft assembly is smaller than the distance between the rotor core air outlet and the central axis of the motor shaft assembly.

3. The air-cooled motor according to claim 1, characterized in that: There are six W-shaped heat dissipation ducts evenly distributed on the same circumference, with the double openings of the W-shape facing away from the machine base. The W-shaped heat dissipation ducts are only connected to the interior of the motor.

4. The air-cooled motor according to claim 1, characterized in that: The rear end cover is provided with 12 fixing holes and 12 rear end cover air outlets, the fixing holes are used for connecting the rear end cover with the machine base, and the wind cover completely covers the rear end cover air outlets.

5. The air-cooled motor according to claim 1, characterized in that: The cooling airflow direction of the internal ventilation and heat dissipation system of the motor is sucked in from the boost check device, passes through the rotor core air inlet, the rotor core ventilation duct, the rotor core air outlet, and the guide device, and is driven by the wind collecting wheel to flow to the air inlet of the inner wall of the machine base, the W-shaped heat dissipation duct, the air outlet of the inner wall of the machine base, and the boost check device; the cooling airflow direction of the external ventilation and heat dissipation system of the motor is sucked in from the wind cover air inlet, driven by the fan to flow to the boost air guide shell, passes through the rear end cover outlet, and flows to the heat dissipating fins and the outside of the W-shaped heat dissipation duct.

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