According to the speed formulan=60f/pIn addition to changing the number of poles, we can also change the frequencyfThe way to achieve speed regulation effect. Variable frequency speed regulation is through changeThree-phase asynchronous motorThe stator power supply frequency is used to achieve the speed regulation method of changing the speed, of course, the main equipment of frequency conversion speed regulation is to provide frequency conversion power to achieve the frequency converter.
The frequency converter on the market can be divided into two categories, AC frequency converter and DC frequency converter, its main characteristics are: high efficiency, and no additional loss in the speed regulation process, the speed regulation range is relatively wide, generally suitable for squirrel cage asynchronous motor, this speed regulation method is more suitable for high precision, good speed regulation performance occasions.
We can think of the inverter as a device that changes the power frequency of the motor, in this inverter, the power frequency is first50HZThe alternating current is converted into direct current, and then the direct current is changed into alternating current that can be adjusted in frequency and voltage through the inverter link in the inverter, and then suppliedThree-phase asynchronous motor.
Variable frequency speed regulation is a commonly used three-phase asynchronous motor speed regulation, mainly the use of variable frequency speed regulation than the polar logarithm speed regulation and variable slip rate speed regulation have a higher speed range, the motor according to the frequency we set to achieve the speed adjustment, so as to achieve the purpose of stepless speed regulation in a very wide frequency range.
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