A frequency converter is a device that converts power to other frequencies of power supply. The power frequency of our country is 50Hz, in the field of motors, in order to change the speed of the motor, or other performance changes, many motors choose inverter power supply.
Inverter is a kind of conversion equipment used with the inverter motor, from the equipment of the line, the inverter is between the motor and the power frequency power supply, and the motor with different load characteristics should match the inverter with different performance.
The relationship between the voltage and frequency of the inverter
In the case of an asynchronous motor, the torque of the motor is the result of the effect of the magnetic flux of the motor and the rotor current. When the frequency of the power supply is lowered, if the input voltage of the motor is kept unchanged, the magnetic flux of the motor will be full, which will cause the motor winding to burn in severe cases. Therefore, when reducing the frequency of the power supply, the input voltage of the motor should be lowered at the same time, and the magnetic flux of the motor should be controlled as the principle, which is generally used in the load of fans and pumps.
For power frequency motors, if the voltage is lower than the additional voltage, the current of the motor will increase a lot if the same power is output, especially for the motor running on the temporary line, and the winding incineration problem caused by this is particularly large. Then about the motor powered by the inverter, when running at low speed, if the same power is required to be output, that is, the constant power operation condition, there is the same problem of increasing the current, but if it is a constant torque operation condition, the current of the motor will not change much.
The control key of the 60Hz motor is the power frequency 50Hz power supply experiment
Regarding the newly built experimental institutions, most of them are equipped with variable frequency power supplies, which can be tested according to the practical frequency of the motor, but for some old experimental equipment or some repair units, it is not necessary to have variable frequency experimental conditions, and how to experiment about 60Hz motors?
According to the theoretical speculation in this paper, when the power frequency 50Hz power supply is selected, the voltage drop method should be selected, and the voltage experiment should be applied according to the calculated value of the motor additional voltage divided by 1.2.
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Product Introduction
compose
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2. Crimping module
3. Back cover 7751S (optional)
Operating temperature range
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Contact
working hours
