Protection-type AC variable frequency motor for electric fork-lift truck

Abstract

The invention discloses a protection-type AC variable frequency motor for an electric fork-lift truck, and mainly relates to the technical field of AC variable frequency motors. A main shaft passes through an external housing which is formed by the connection of a front end cover, an engine base and a rear end cover. One end of the engine base is fixedly connected with a wiring board, wherein the interior of the wiring board is provided with a temperature sensor, and the exterior of the wiring board is provided with a wiring board cover. A rotor assembly is cooperatively connected with the main shaft and a stator assembly in the engine base. Two ends of the main shaft are respectively in cup joint with a first bearing and a second bearing. A coder is connected with the main shaft through a shaft coupler. A waveform spring piece is disposed between the front end cover and the first bearing, and an oil seal is disposed between the front end cover and the main shaft. Two ends of the second bearing are respectively provided with a circlip for a hole, and a circlip for a shaft. The motor is simple in overall structure, and greatly reduces the assembly difficulty. Moreover, the excellent performances of the motor can meet the actual demands, and the motor is good in sealing performance, is high in protection level, is wide in application range, and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of AC frequency conversion motors, in particular to a protective AC frequency conversion motor for electric forklifts. Background technique [0002] Electric forklifts are more and more popular in the market because of their advantages such as high energy conversion efficiency, low noise, no exhaust emissions, convenient control, good starting performance, stable operation, simple operation and flexible maneuvering. Under the background of energy saving and environmental protection, electric forklifts have also developed rapidly in my country in recent years, with an average annual growth rate of more than 20%, while electric forklifts currently only account for 30% of the forklifts in my country. The country has accounted for 70% to 80%, so the prospect is bright. [0003] The drive control part matched with the electric forklift is mainly composed of a driver and a motor, which is a low-voltage and high-cu...

AI Technical Summary

Problems solved by technology

[0004] 1. The overall performance of the motor is poor and the quality is low, which cannot meet the actual needs;

[0005] 2. The overall structure of the motor is complex, the volume is large, the assembly is complicated and cumbersome, the service life is short, maintenance is often required, and the operating cost is relatively high;

[0006] 3. Poor sealing and low protection level, not suitable for places with much dust and high humidity;

[0007] 4. The motor tends to heat up after a long time of continuous work, which leads to excessive internal temperature and further leads to motor failure, and the safety cannot be guaranteed

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