What is the difference between a variable frequency motor and an ordinary motor?

Want to know the difference between a variable frequency motor and a normal motor? First of all, to understand what is the inverter? What are the classifications of the inverter? What is the working principle of the inverter?
Want to know the difference between a variable frequency motor and a normal motor? First of all, to understand what is the inverter? What are the classifications of the inverter? What is the working principle of the inverter? Dalan Motor Xiaobian made the following summary.

1, the definition of the inverter

1 Inverter is a device that converts power frequency power supply (50Hz or 60Hz) into AC power of various frequencies to realize variable speed operation of the motor.

2 The control circuit completes the control of the main circuit, the rectifier circuit converts the alternating current into direct current, the direct current intermediate circuit smoothes the output of the rectifier circuit, and the inverter circuit reverses the direct current into alternating current.

3 vector control inverter This kind of inverter that requires a lot of calculations, sometimes requires a CPU for torque calculation and some corresponding circuits.

4 frequency control is to achieve the purpose of speed regulation by changing the frequency of the motor stator winding power supply.

5 frequency conversion technology was born in response to the need for AC motor stepless speed regulation.

2, the classification of the inverter

1 According to the working mode of the main circuit, it is divided into voltage type inverter and current type inverter;

2 According to the switch mode, it is divided into PAM control inverter, PWM control inverter and high carrier frequency PWM control inverter;

3 According to the working principle, it is divided into V/f control inverter, slip frequency control inverter and vector control inverter;

4 According to the use, it is divided into general-purpose inverter, high-performance special inverter, high-frequency inverter, single-phase inverter and three-phase inverter.

5VVVF: change voltage and change frequency;

6CVCF: constant voltage, constant frequency.

7 Inverter for motor control can change the voltage and change the frequency.

3, the working principle of the inverter

The synchronous speed expression of the AC motor is: n=60f(1-s)/p

Where: n - the speed of the asynchronous motor; f - the frequency of the asynchronous motor; s - the motor slip rate; p - the number of poles of the motor.

It can be known from the above formula:

1 The speed n is proportional to the frequency f, and the speed of the motor can be changed as long as the frequency f is changed;

2 When the frequency f is varied from 0 to 50 Hz, the motor speed adjustment range is very wide.

3 Inverter is to achieve speed adjustment by changing the motor power "target=_blank> machine power frequency, is an ideal high-efficiency, high-performance speed control means.








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