Motor with axial ventilation cooling structure

Abstract

A motor with an axial ventilation cooling structure comprises a casing (3), two ends of the casing are respectively connected with an end cover, an even number of ribs (7) symmetrically extend inwards from the inner wall of the casing, the excircle surface of a stator is tightly attached to the ribs, a fan (8) is mounted on a rotating shaft (6), an air outlet (1) and an air inlet (10) are respectively arranged on the two end covers, the fan (8) is positioned in the casing, and the air inlet (10) is communicated with the air outlet (1). A wedge strip (11) is arranged between every two adjacent ribs, notches are respectively arranged on the inner wall of the casing and the surface of the outer circle of the stator, and the wedge strips are tightly inserted into the notches. The motor has the beneficial effects that the fan is arranged in the casing, the size of the motor is greatly reduced, and when the fan rotates, external air passes through the space between the stator and the casing and the space between the rotor and the stator to take away heat between the stators; the wedge strip is embedded between the casing and the stator, so that rotation displacement between the stator and the casing can be prevented, and the connection strength of the stator and the casing is improved.

Description

Technical Field

[0001] The utility model relates to an electric motor with an axial ventilation and cooling structure. Background Art

[0002] The air cooling methods of electric motors include casing surface ventilation cooling and motor internal axial ventilation cooling. The air source for internal ventilation of the motor is provided by an additional fan, which increases the volume of the motor. In order to allow the cooling air to flow axially along the stator surface, a gap must be left between the stator and the casing, which greatly reduces the contact area between the stator and the casing and reduces the connection strength between the stator and the casing. Utility Model Content

[0003] In order to solve the above problems, the present invention proposes an electric motor with an axial ventilation cooling structure, which can eliminate the need for an external fan while ensuring the cooling effect and improve the connection strength between the stator and the casing.

[0004] The technical solution of the present utility model is an electric motor with an axial ventilation cooling structure, which includes a casing 3, a stator 4, a rotor 5, and a rotating shaft 6. The two ends of the casing are respectively connected to a first end cover 2 and a second end cover 9. The rotating shaft 6 on the rotor 5 is supported by the first end cover 2 and the second end cover 9. An even number of ribs 7 are symmetrically extended inward on the inner wall of the casing, and the outer circular surface of the stator is in close contact with the ribs. The utility model is characterized in that a fan 8 is mounted on the rotating shaft, an air outlet 1 is provided on the first end cover 2, and an air inlet 10 is provided on the second end cover 9. The fan 8 is located on the inner side of the second end cover 9, a wedge strip 11 is provided between adjacent ribs, and notches are respectively provided on the inner wall of the casing and the outer circular surface of the stator, and the wedge strip 11 is tightly inserted into the notch.

[0005] The beneficial effect of the utility model is that the fan is installed in the casing, which greatly reduces the volume of the motor and reduces wind loss. When the fan rotates, external air enters from the air inlet, passes between the stator and the casing and between the rotor and the stator, takes away the heat therebetween, and then exits from the air outlet to achieve the cooling purpose; the wedge strip is embedded between the casing and the stator, which can prevent rotational displacement between the stator and the casing, thereby improving the connection strength between the stator and the casing. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural diagram of the present utility model.

[0007] Figure 2 for Figure 1 The AA section view of the stator is not shown in this view, in which the stator windings and the rotor conductive bars are not shown.

[0008] The accompanying drawings are marked as follows: 1-air outlet, 2-first end cover, 3-housing, 4-stator, 5-rotor, 6-rotating shaft, 7-rib, 8-fan, 9-second end cover, 10-air inlet, 11-wedge, 12-air duct. DETAILED DESCRIPTION

[0009] An electric motor with an axial ventilation cooling structure includes a housing 3, a stator 4, a rotor 5, and a rotating shaft 6. A first end cover 2 and a second end cover 9 are respectively connected to the two ends of the housing. The rotating shaft 6 on the rotor 5 is supported by the first end cover 2 and the second end cover 9. An even number of ribs 7 extend symmetrically inward from the inner wall of the housing. After turning, the inner circle of the ribs can match the outer circle of the stator (transition fit), and the outer circle surface of the stator is in close contact with the ribs. The outer circle of the stator and the inner wall of the housing form an air duct 12, and cooling air can pass through the surface of the stator.

[0010] A fan 8 is installed on the rotating shaft, an air outlet 1 is provided on the first end cover 2, and an air inlet 10 is provided on the second end cover 9. The fan 8 is located on the inner side of the second end cover 9. The air outlet and the air inlet are both strip-shaped and evenly distributed radially on the first end cover and the second end cover.

[0011] Wedge strips 11 are provided between adjacent ribs. Notches are provided on the inner wall of the housing and the outer circumferential surface of the stator respectively. The wedge strips 11 are tightly inserted into the notches. The cross section of the wedge strips is circular or rectangular.

[0012] The wedge bars can prevent circumferential displacement between the stator and the casing, thereby improving the connection strength between the stator and the casing; at the same time, they can also reduce the number of ribs and increase the contact area between the cooling air and the stator; the number of ribs is four, six or eight, preferably six.

Claims

1. An electric motor with an axial ventilation cooling structure, comprising a housing (3), a stator (4), a rotor (5), and a rotating shaft (6), wherein the two ends of the housing are respectively connected to a first end cover (2) and a second end cover (9), the rotating shaft (6) on the rotor (5) is supported by the first end cover (2) and the second end cover (9), a plurality of ribs (7) extend inwardly from the inner wall of the housing, and the outer cylindrical surface of the stator is in close contact with the ribs, wherein the motor is characterized in that: A fan (8) is mounted on the rotating shaft, an air outlet (1) is provided on the first end cover (2), and an air inlet (10) is provided on the second end cover (9). The fan (8) is located on the inner side of the second end cover (9), wedge strips (11) are provided between adjacent ribs, and notches are provided on the inner wall of the housing and the outer circumferential surface of the stator, respectively, and the wedge strips (11) are tightly inserted into the notches.

2. The electric motor with an axial ventilation cooling structure according to claim 1, characterized in that: The number of ribs is six.

3. The electric motor with an axial ventilation cooling structure according to claim 1, characterized in that: The air outlet and the air inlet are both strip-shaped and evenly distributed along the radial direction on the first end cover and the second end cover.

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