Brake unit suppliers remind you that commonly used frequency converters are selected based on the load characteristics, speed range, static speed accuracy, and starting torque requirements of the production machinery; And commonly used frequency converters adopt V/F control mode or vector control mode; The variable frequency motor it drives is very different from ordinary motors, and this type of motor is also suitable for a wide frequency range, so long-term low-frequency operation of the frequency converter is not without harm to the frequency converter; However, if the frequency converter operates at low frequencies for a long time, it is necessary to fully consider its installation environment and relatively good ventilation performance.
To put it in terms of V/F control mode, the frequency converter changes the frequency of the motor power supply while changing the voltage of the motor power supply, so as to maintain a certain magnetic flux of the motor. Within a wide speed range, the efficiency and power factor of the motor do not decrease.
Because it controls the ratio of voltage (V) to frequency (F), it is called V/F control. And its V/F control characteristics are simple control circuit structure, low cost, and good mechanical hardness, which can meet the smooth speed regulation requirements of general transmission.
During the process of the output frequency of the frequency converter rising from 0Hz to the fundamental frequency, the V/F line where the output voltage increases proportionally from 0V to the maximum output voltage is called the fundamental V/F line.
The basic characteristic parameters of V/F are defined. It is currently the most widely used form of frequency converter. When the output frequency of the frequency converter rises from 0Hz to 50Hz, the output voltage increases proportionally from 0V to 380V.
From the definition of V/F characteristic parameters, it can be seen that there is a FL (representing the lowest frequency of the lower line), FH (representing the upper limit frequency), FB (representing the rated frequency), and Fmax (representing the maximum frequency); For example, this V/F frequency converter has a maximum frequency range of 50-500Hz, a rated frequency of 50Hz, a basic operating frequency of 1-500Hz, and a basic maximum output voltage of 1-480V;
In addition, it is important to pay attention to the V/F curve setting of the frequency converter and adopt corresponding settings for different load properties; Because the V/F curve has multiple control settings; Moreover, multiple voltage points need to be adjusted according to one's own load conditions (0.00~100%), and the default values set by the inverter at the factory may not be suitable for oneself.