Structure for preventing clamping rings of AC motor rotor from falling off shaft
A technology of rotor pressure ring and AC motor, applied in the direction of magnetic circuit shape/style/structure, magnetic circuit rotating parts, etc., can solve problems such as motor failure, weakened interference fit, pressure ring falling off, etc., to ensure effective connection, Ensure safety and prevent loosening of threaded connections
Active Publication Date: 2013-01-23
CHENGDU CRRC ELECTRIC MOTOR CO LTD
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Problems solved by technology
However, after working for a long time, due to the uneven heating of the press ring and the shaft, the press ring expands more when heated, and the shaft expands less when heated, thus weakening the interference fit between them, so it cannot produce enough shaft. The axial force counteracts the pressure of the expansion laminations of the rotor core, causing the pressure ring to fall off the shaft, resulting in motor failure
Method used
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[0017] The present invention will be further described below in combination with specific embodiments and accompanying drawings.
[0018] like figure 2 , image 3 and Figure 4 As shown, a structure for preventing the rotor pressure ring of an AC motor from falling off the shaft includes a rotating shaft 1, a rotor core 2 is installed on the rotating shaft 1, and pressure rings 3 are arranged at both ends of the rotor core 2, and the pressure ring 3 is interference fit on the rotating shaft 1 A 28 mm long external thread section is provided on the rotating shaft 1 outside the pressure ring 3 near the non-transmission end of the rotating shaft 1, and a layer of thread fastening glue is provided on the external thread section, and a nut 4 is connected to the rotating shaft 1 through the external thread, And fit closely with the pressure ring 3, a pin hole is opened in the axial direction at the threaded connection between the nut 4 and the rotating shaft 1, and the stop pin 5...
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The invention discloses a structure for preventing clamping rings of an AC motor rotor from falling off a shaft. The structure comprises the rotating shaft. A rotor core is arranged on the rotating shaft. The two ends of the rotor core are provided with the clamping rings which form interference fit with the rotating shaft. An external thread section is arranged on the rotating shaft outside the clamping ring close to the non-transmission end of the rotating shaft. A nut is connected with the rotating shaft by the external thread section, and is closely attached to the clamping ring. A pinhole is axially reserved at the threaded connection part of the nut and the rotating shaft. A stop pin is inserted into the pinhole. The structure is simple and can effectively prevent the clamping ringsfrom falling off the rotating shaft. When the interference fit between the clamping rings and the rotating shaft is out of work, the lamination pressure of the rotor core is born by the threaded connection between the nut and the rotating shaft to ensure the safety of the structure. The stop pin arranged at the threaded connection part of the nut and the rotating shaft can prevent the threaded connection from being loosened after a motor is manufactured and run for long and ensure effective connection between the nut and the rotating shaft.
Description
technical field [0001] The invention relates to the structure of the rotor of an AC motor, in particular to a structure for preventing the pressure ring of the rotor of the AC motor from falling off the shaft. Background technique [0002] like figure 1 As shown, the rotor core of the traditional AC motor is directly fixed by the pressure ring with interference fit on the shaft. The interference fit between the pressure ring and the shaft generates an axial force, thereby offsetting the expansion lamination pressure of the rotor core. However, after working for a long time, due to the uneven heating of the pressure ring and the shaft, the pressure ring expands more when heated, and the shaft expands less when heated, thus weakening the interference fit between them, so that it cannot produce enough shaft. The axial force counteracts the pressure of the expanding laminations of the rotor core, which causes the pressure ring to fall off the shaft, resulting in motor failure. ...
Claims
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IPC IPC(8): H02K1/28
Inventor 李训虎高连斌
Owner CHENGDU CRRC ELECTRIC MOTOR CO LTD