How does a frequency converter work?

The working principle of the inverter is to apply the principle of frequency conversion technology and microelectronics technology to control the power control equipment of the AC motor by changing the frequency of the working power supply of the motor.

The power supply used is divided into AC power supply and DC power supply, and the general DC power supply is mostly obtained by AC power supply through transformer voltage transformation and rectification filtering. AC power accounts for about 95% of the total power supply used by people.

The inverter is a device that converts the power supply (50Hz or 60Hz) into AC power supply of various frequencies to realize the variable speed operation of the motor, in which the control circuit completes the control of the main circuit, the rectifier circuit converts the alternating current into direct current, the DC intermediate circuit smooths the output of the rectifier circuit, and the inverter circuit reverses the direct current into alternating current.

We know that the synchronous speed expression of the AC motor is bit:

n＝60 f(1－s)/p (1)

where n——— speed of the asynchronous motor;

f——— frequency of the asynchronous motor;

s——— motor slip rate;

p——— number of pole pairs of the motor.

From equation (1), it can be seen that the speed n is proportional to the frequency f, as long as the frequency f is changed, the speed of the motor can be changed, and when the frequency f changes in the range of 0 50hz, the speed adjustment range of the motor is very wide. The inverter is to change the frequency of the motor power supply to achieve speed regulation, which is an ideal means of high-efficiency and high-performance speed regulation.

Hello, glad to be able to your question.

The inverter is a kind of power electronic device, which can process the AC signal of the input power supply through the circuit and output the AC signal that meets the requirements. The working principle of the inverter is mainly by converting direct current into high-frequency alternating current, and then converting high-frequency alternating current into alternating current signals of the required frequency and voltage.

The working principle of the inverter mainly includes the following aspects:

Rectification: Converts alternating current into direct current.

Filtering: Removing ripple from a circuit through components such as capacitors or inductors.

Inverter: Converts direct current into high-frequency alternating current.

Output filtering: The high-frequency alternating current output by the inverter is converted into the required low-frequency alternating current through the filter.

Control: Control the operating state of the motor by controlling the output frequency and voltage of the inverter.

The inverter can be widely used in various motor drive systems, with speed regulation, protection, energy saving and other functions, which can improve the efficiency and reliability of the system.

We can help you solve problems such as frequency converters, electrical control cabinets, soft starts, etc.

The master explained and demonstrated: the working principle of the inverter!

The working principle of the inverter is to convert a fixed frequency power input into a power supply with an adjustable frequency conversion output. Its main components include rectifiers, filters, inverters, etc.

Specifically, the working process of the inverter is as follows:

Power input: The AC power supply with a fixed frequency is input to the inverter, and the AC power is converted into DC power through the rectifier.

Filter: The DC power supply is filtered through the filter to remove the clutter in the DC power supply and make the voltage stable.

Inverter: The smooth DC power supply is converted into an adjustable AC power supply through the inverter, so that the main function of the inverter is realized.

In the process of inverter operation, the inverter is the most core component. The inverter works by turning the DC voltage into an AC voltage. Specifically, the inverter converts the DC voltage into a high-frequency AC voltage through a high-frequency transformer, and then through the bridge rectifier circuit to obtain an adjustable AC voltage output.

AC drives are used in a wide range of applications, such as motor control, wind power generation, air conditioning, water pumps, manufacturing automation, and more. By controlling the speed and load of the motor, energy saving and consumption reduction and automatic control can be realized.

The working principle of the inverter is to control the frequency and voltage of the output power supply to achieve accurate speed regulation and control of the motor. The basic working principle of the inverter is to convert the AC power supply into DC power through the rectifier, and then convert the DC power into controllable AC power through the inverter inside the inverter, and then output it to the motor for control.

Specifically, the workflow of the inverter is as follows:

The AC power supply is converted into direct current by a rectifier and filtered by a capacitor filter to eliminate voltage fluctuations and electromagnetic interference.

The direct current passes through the PWM (pulse width modulation) controller to control the frequency and voltage of the alternating current output by the inverter, thereby controlling the speed and operating state of the motor.

The alternating current output by the inverter is filtered by the output filter to ensure the stability and purity of the output power supply.

The control circuit controls and protects the motor, including the start, stop, reverse, multi-stage speed regulation and other functions of the motor.

In short, the inverter realizes the precise speed regulation and control of the motor by converting the power supply AC into controllable DC power, and then converting DC power into controllable AC power. By controlling the frequency and voltage of the output power supply, the inverter can accurately control the speed and running status of the motor, adapt to the needs of different loads and operating environments, and achieve the purpose of saving energy and reducing consumption, improving the operation efficiency and stability of the equipment.

The principle of inverter (English variable-frequency drive, referred to as VFD) is a power control equipment that uses the principle of frequency conversion technology and microelectronics technology to control the AC motor by changing the frequency of the working power supply of the motor.

The power supply we use is divided into AC power supply and DC power supply, and the general DC power supply is mostly obtained by AC power supply through transformer voltage transformation and rectification filtering. AC power accounts for about 95% of the total power supply used by people.

In general, a device that converts alternating current with a fixed voltage and frequency into alternating current with variable voltage or frequency is called an inverter. The device first converts three-phase or single-phase alternating current to direct current (DC). Direct current (DC) is then converted to three-phase or single-phase alternating current (AC).

The inverter changes the output frequency and voltage at the same time, that is, changes the n0 on the motor running curve, so that the motor running curve moves down in parallel. Therefore, the inverter can make the motor obtain a larger starting torque with a smaller starting current, that is, the inverter can start the heavy load.

The inverter has basic functions such as voltage regulation, frequency regulation, voltage stabilization, speed regulation, etc., and applies modern science and technology, which is expensive but has good performance, complex internal structure but simple to use, so it is not only used to start the motor, but is widely used in various fields, all kinds of power, all kinds of shapes, all kinds of volumes, all kinds of uses, etc. With the development of technology and the reduction of costs, inverters will be more widely used.