Cylindrical radial ventilation device for high-power-density motor

Abstract

A cylindrical radial ventilation device for a high-power-density motor comprises a welding rib shaft (1), an arc-shaped key (2), a cylinder (3), a key (4) and a rotor core (5), a center plate (21) is arranged in the middle of the welding rib shaft (1), a connecting groove (22) is formed in the surface of the center plate (21), the connecting groove (22) is connected with the cylinder (3), a ventilation opening (18) is formed in the surface of the cylinder (3), a long round hole (19) is formed in one side of the ventilation opening (18), and the cylinder (3) is connected with the arc-shaped key (2). And the rotor core (5) is fixed, so that the high-speed performance of the high-power motor can be ensured, the electromagnetic performance reliability of the motor can be improved, meanwhile, the cooling effect of a radial air path is effectively ensured, and technical support is provided for the reliability of various performances of the high-power density motor in actual working condition operation.

Description

Technical Field

[0001] The utility model relates to the field of electric motors, in particular to a cylindrical radial ventilation device for high power density electric motors. Background Art

[0002] The existing high power density motor adopts radial ventilation, and axial ventilation holes are designed on the rotor punchings. Cooling air enters through the axial ventilation holes and is radially discharged through the ventilation slots to achieve the purpose of cooling the motor. This structure has obvious defects: 1. The holes on the rotor punchings make the magnetic flux density distribution of the motor uneven, which seriously affects the electromagnetic performance of the motor; 2. The air volume in and out of the rotor punching holes is limited, and the wind resistance is large, which affects the cooling effect of the motor; 3. When the rotor punchings and the rotating shaft are fitted with interference fit, the inner hole of the punching is unevenly stressed and prone to deformation, which affects the dynamic balance performance of the rotor. As the motor speed continues to increase, this type of structure can no longer meet the actual working conditions. Therefore, it is necessary to redesign the radial ventilation structure used in high power density motors to meet the actual working conditions of high power density motors. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides a cylindrical radial ventilation device for a high-power-density motor, which ensures that the motor has reliable electromagnetic performance, high-speed performance and cooling effect, effectively takes away the heat generated by the motor, and ultimately makes the various performances of the high-power-density motor meet the requirements of actual working conditions.

[0004] The purpose of this utility model is achieved through the following technical solutions:

[0005] A cylindrical radial ventilation device for a high power density electric motor comprises a welded rib shaft, an arc key, a cylinder, a key and a rotor core. A web is provided in the middle of the welded rib shaft, a connecting groove is provided on the surface of the web, the connecting groove is connected to the cylinder, a vent is provided on the surface of the cylinder, a long circular hole is provided on one side of the vent, the cylinder is connected to the arc key to fix the rotor core, the cylinder is fixed by the connecting groove, a key is provided on the surface of the cylinder, the lower part of the key is connected to the long circular hole, a plurality of rotor cores are interference fit on the upper part of the key, ventilation gaps are provided between the rotor cores, heat dissipation wind enters from the gaps of the web and flows out from the vents, the ventilation gaps and the rotor gaps.

[0006] The left side of the welded rib shaft is provided with an extension end bearing, the right side of the welded rib shaft is provided with a non-extension end bearing, the extension end bearing is connected to the extension end cover, the non-extension end bearing is connected to the non-extension end cover, the extension end cover and the non-extension end cover are connected through the stator, and are assembled and fixed through the extension end cover and the non-extension end cover. Beneficial Effects

[0007] 1. In order to solve the problem of unstable electromagnetic performance and high-speed performance of high-power density motors, we need to redesign the radial ventilation structure of the motor. Under the premise of ensuring that the motor meets the working conditions, the electromagnetic performance and high-speed performance of the motor can be effectively improved to meet the requirements of actual use conditions. In actual application, the cylindrical radial ventilation device for high-power density motors of the present invention is used to optimize the radial ventilation structure, reduce the stress unevenness of the punching sheet shaft hole, and reduce the influence of the punching sheet ventilation holes on the magnetic flux density. Therefore, the high-speed performance of the high-power motor can be guaranteed and the reliability of the electromagnetic performance of the motor can be improved. At the same time, the cooling effect of the radial air path is effectively guaranteed, which provides technical support for the reliability of various performances of the high-power density motor under actual working conditions.

[0008] 2. To improve the reliability of the product in practical applications, the technical solution of the present invention is to redesign the rotor structure while ensuring that the radial ventilation structure of the motor remains unchanged. The rotating shaft is changed to a welded rib shaft, and a cylindrical structure with a radial air duct is added to the outer circle of the welded rib shaft, which is installed with the rotor core through the outer side of the cylinder. The overall cooling air path diagram of the motor is shown in the figure. Figure 2 As shown, after the motor is operated under actual working conditions, it is shown that the cylindrical radial ventilation structure for high power density motors can effectively improve the high-speed performance and electromagnetic performance of the product and meet the use requirements of actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a structural cross-sectional view of a cylindrical radial ventilation device for a high power density motor described in the utility model.

[0010] Figure 2 This is a cross-sectional view of the shaft extension end cover structure described in the utility model.

[0011] Figure 3 It is a schematic diagram of the cylinder structure described in the utility model. Implementation

[0012] The utility model is further described in detail below according to the accompanying drawings and embodiments:

[0013] like Figure 1As shown, a cylindrical radial ventilation device for a high power density motor includes a welded rib shaft 1, an arc key 2, a cylinder 3, a key 4, and a rotor core 5. A web 21 is provided in the middle of the welded rib shaft 1, a connecting groove 22 is provided on the surface of the web 21, the connecting groove 22 is connected to the cylinder 3, a vent 18 is provided on the surface of the cylinder 3, a long circular hole 19 is provided on one side of the vent 18, the cylinder 3 is connected to the arc key 2 to fix the rotor core 5, the cylinder 3 is fixed by the connecting groove 22, a key 4 is provided on the surface of the cylinder 3, the lower part of the key 4 is connected to the long circular hole 19, a plurality of rotor cores 5 are interference fitted on the upper part of the key 4, and ventilation gaps 17 are provided between the rotor cores 5, and heat dissipation wind enters from the gap of the web 21 and flows out from the vent 18, the ventilation gap 17, and the rotor gap.

[0014] The left side of the welded rib shaft 1 is provided with an axial extension end bearing 6, and the right side of the welded rib shaft 1 is provided with a non-axial extension end bearing 11, the axial extension end bearing 6 is connected to the axial extension end cover 7, the non-axial extension end bearing 11 is connected to the non-axial extension end cover 10, and the axial extension end cover 7 and the non-axial extension end cover 10 are connected through the stator 8. The axial extension end cover 7 and the non-axial extension end cover 10 are assembled and fixed, and 8 webs 21 are provided.

[0015] There are 8 webs 21, which are fixed to the cylinder 3 with radial air ducts by staggered oblong hole plug welding webs 21 and connected to the connecting grooves 22. This process structure design can prevent obvious defects in welding and affect the structural strength.

[0016] The cylinder 3 is made of metal, and a partition 20 is designed in the middle of the welded rib shaft 1. The partition 20 is connected to the webs 21 on both sides, which can avoid the uneven distribution of the cooling air path at the rotor and affect the cooling effect. The symmetry of the air paths on both sides is ensured.

[0017] The cylindrical radial ventilation device for high power density motors of the present invention is mainly used in drive motors of mechanical equipment such as fracturing vehicles and fracturing prys, which can not only ensure the high-speed performance of high power motors but also improve the reliability of the electromagnetic performance of the motors, while effectively ensuring the cooling effect of the radial air path, thereby effectively reducing the temperature rise of high power density motors.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A cylindrical radial ventilation device for a high power density motor, characterized in that The invention comprises a welded rib shaft (1), an arc key (2), a cylinder (3), a key (4), and a rotor core (5). A web (21) is arranged in the middle of the welded rib shaft (1). A connecting groove (22) is arranged on the surface of the web (21). The connecting groove (22) is connected to the cylinder (3). A vent (18) is arranged on the surface of the cylinder (3). One side of the vent (18) has an oblong hole (19). The cylinder (3) is connected to the arc key (2) to fix the rotor core (5). The cylinder (3) is fixed by the connecting groove (22). A key (4) is arranged on the surface of the cylinder (3). The lower part of the key (4) is connected to the oblong hole (19). The upper part of the key (4) is interference fit with a plurality of rotor cores (5). Ventilation gaps (17) are arranged between the rotor cores (5). Heat dissipation air enters from the gap of the web (21) and flows out from the vent (18), the ventilation gap (17), and the rotor gap (12).

2. A cylindrical radial ventilation device for a high power density motor according to claim 1, characterized in that The left side of the welded rib shaft (1) is provided with an axial extension end bearing (6), and the right side of the welded rib shaft (1) is provided with a non-axial extension end bearing (11); the axial extension end bearing (6) is connected to the axial extension end cover (7), and the non-axial extension end bearing (11) is connected to the non-axial extension end cover (10); the axial extension end cover (7) and the non-axial extension end cover (10) are connected via a stator (8); and they are assembled and fixed via the axial extension end cover (7) and the non-axial extension end cover (10).

3. A cylindrical radial ventilation device for a high power density motor according to claim 2, characterized in that : Eight width plates (21) are provided.

4. A cylindrical radial ventilation device for a high power density motor according to claim 3, characterized in that A partition plate (20) is designed in the middle of the welding rib shaft (1), and two sides of the partition plate (20) are connected to the web plates (21).

5. A cylindrical radial ventilation device for a high power density motor according to claim 3, characterized in that : The cylinder (3) is made of metal.

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