Moisture-proof motor
By designing heating elements in the motor that are far from the winding coils, the stator core is heated by air heat transfer and conducted to the windings, thus solving the problem of winding insulation damage in humid environments and achieving efficient moisture protection and convenient installation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGYAN DELI MOTOR CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-24
AI Technical Summary
In humid environments, the heating device of existing electric motors is in close contact with the stator windings, which can easily damage the insulation layer of the winding coils and result in low installation efficiency.
Design a moisture-proof electric motor where the heating element is located away from the winding coil, heats the stator core through air heat transfer and conducts it to the winding. The heating element is spaced from the stator winding and is filled with metal materials and quartz sand to improve insulation performance. It is easy to install.
It effectively removes humid air from the winding coil, ensuring insulation performance without damaging the winding, and the installation process is highly efficient.
Smart Images
Figure CN224555429U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an electric motor with a moisture-proof function. Background Technology
[0002] In humid environments, moisture can enter the motor when it stops running, degrading the insulation performance of the stator windings. To prevent moisture from entering the motor, a heating device is installed inside. Typically, a heating wire is embedded in the stator slot along with the winding coils. When the motor stops running, the heating wire is energized, raising the winding coil temperature above ambient temperature. The drawbacks are that because the heating wire is in close contact with the stator windings, excessively high temperatures can easily damage the winding coil insulation. Furthermore, the heating wire can only be installed manually, making it inefficient to use a wire-inserting machine. Utility Model Content
[0003] To address the aforementioned issues, this invention presents a moisture-proof electric motor with its heating device located far from the winding coil, preventing damage to the winding coil when the heating temperature is too high; furthermore, the heating device is easy to install.
[0004] The technical solution of this utility model is a moisture-proof electric motor, which includes a housing 4, a stator 3 fixedly installed in the housing, a rotor 1 inserted in the stator, and end caps 9 connected to both ends of the housing. The feature is that an annular electric heating tube 8 is installed on the inner side of one end cap, the diameter of the inner ring of the electric heating tube is larger than the outer diameter of the rotor, there is a gap between the electric heating tube and the end cap, and there is a gap between the electric heating tube and the end of the stator winding 7.
[0005] The electric heating element includes a heating wire 14 and a tube body 11. The heating wire is inserted into the tube body, and the space between the heating wire and the tube body is filled with quartz sand 13. The tube body is made of metal material.
[0006] Its beneficial effects are as follows: the heating element heats the stator core through air transfer, and then the heat is transferred from the stator core to the winding coils. The temperature inside the motor is higher than the ambient temperature, which can expel humid air from the winding coils and ensure the insulation performance of the windings; the heating element and the stator windings are spaced apart at the ends, so the windings will not be damaged when the temperature is too high. The heating element body is made of metal, making it less prone to damage, and the space between the body and the heating wire is filled with quartz sand, which provides good insulation; the heating element is conveniently installed on the end caps. Attached Figure Description
[0007] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 2 for Figure 1 A-direction view.
[0008] Figure 3 for Figure 1 A magnified view of section C.
[0009] Attached diagram symbols: 1-rotor, 2-cable socket, 3-stator, 4-casing, 5-junction box, 6-terminal board, 7-stator winding, 8-heating tube, 9-end cap, 10-bracket, 11-tube body, 12-groove, 13-quartz sand, 14-heating wire, 15-elastic strip, 16-screw. Detailed Implementation
[0010] A moisture-proof electric motor includes a housing 4, a stator 3 fixedly installed in the housing, a rotor 1 inserted in the stator, and end caps 9 connected to both ends of the housing. The characteristic is that an annular electric heating tube 8 is installed on the inner side of one end cap, the diameter of the inner ring of the electric heating tube is larger than the outer diameter of the rotor, there is a gap between the electric heating tube and the end cap, and there is a gap between the electric heating tube and the end of the stator winding 7.
[0011] The electric heating tube includes a heating wire 14, which is inserted into the tube body 11. Quartz sand 13 is filled between the heating wire and the tube body. The tube body is made of metal material. This ensures the strength and insulation performance of the electric heating tube.
[0012] The mounting structure of the heating element and end cap is as follows: multiple supports 10 extend symmetrically towards the stator on the inner side of the end cap. The supports are L-shaped, with their radial portions pointing towards the rotor axis. A semi-circular groove 12 is located at the junction of the radial and axial portions of the supports, allowing the heating element 8 to fit snugly into the groove. The heating element is held in place by an elastic strip 15, one end of which is curved and fits against the heating element. The other end of the elastic strip is connected to the top of the radial portion of the support by a screw 16. The semi-circular groove 12 prevents radial movement of the heating element, and the elastic strip prevents deformation of the heating element under pressure.
[0013] The heating wire 14 of the electric heating tube is connected to the terminal block 6 in the junction box 5 of the motor's power supply via a wire.
[0014] To improve the uniformity of heating, an electric heating element is also provided on the other end cover. The heating wire in the electric heating element is connected to the pin of the cable socket 2 through a wire. The cable socket is installed on the casing, and the cable plug is connected to an external power source.
[0015] When the motor is running, the heating element is de-energized because the internal temperature of the motor is higher than the ambient temperature. When the motor is not running, the heating element is energized to heat the inside of the motor.
[0016] Its beneficial effects are as follows: when the motor is not running, the heating element heats the stator core through air transfer, and then the heat is transferred from the stator core to the stator windings. The temperature inside the motor is higher than the ambient temperature, which can expel humid air from the winding coils and ensure the insulation performance of the windings; the heating element is spaced from the end of the stator windings, so it will not damage the windings. The heating element body is made of metal, making it less prone to damage, and the space between the body and the heating wire is filled with quartz sand, which provides good insulation; the heating element is conveniently installed on the end cap.
Claims
1. A moisture-proof electric motor, comprising a housing (4), a stator (3) fixedly installed in the housing, a rotor (1) inserted in the stator, and end caps (9) connected to both ends of the housing, characterized in that, An annular heating tube (8) is installed on the inner side of one end cover. The diameter of the inner ring of the heating tube is larger than the outer diameter of the rotor. There is a gap between the heating tube and the end cover, and a gap between the heating tube and the end of the stator winding (7).
2. The moisture-proof electric motor according to claim 1, characterized in that, The electric heating tube includes a heating wire (14) and a tube body (11). The heating wire is inserted into the tube body, and the space between the heating wire and the tube body is filled with quartz sand (13). The tube body is made of metal material.
3. The moisture-proof electric motor according to claim 2, characterized in that, The installation structure of the heating tube and the end cap is as follows: multiple brackets (10) extend symmetrically in the direction of the stator on the inner side of the end cap. The brackets are 7-shaped, and the radial part of the bracket points to the axis of the rotor. There is a semi-circular groove (12) at the junction of the radial part and the axial part of the bracket. The heating tube (8) can fit into the groove. The heating tube is pressed by an elastic strip (15). One end of the elastic strip is curved and fits the heating tube. The other end of the elastic strip is connected to the top of the radial part of the bracket by a screw (16).