The Principle of VFD Electric Motor and Its Difference from DC Motor

The VFD electric motor is mainly used to adjust the working power frequency of the motor, and control the corresponding equipment by changing the frequency of the AC power supply and the voltage output. It is widely used in life and heavy industry, and has a large application span. The previous DC speed regulation technology is too large in size and has low efficiency and is always prone to failure. Therefore, frequency conversion technology was born out of extensive demand.

1. The principle of VFD electric motor

The drive circuit of the VFD electric motor consists of two parts: the main circuit and the control circuit. Now these two parts have been integrated into the same chip, so that only one device can be used to realize all the control functions of the electric motor with integrated vfd, which simplifies the circuit structure. The role of VFD electric motor is to save energy by frequency conversion between asynchronous motors or vfd for synchronous motor, to realize mutual conversion and application in various automation systems, and to meet our ever-increasing needs, and to achieve motor soft start. The birth of variable frequency motor is inevitable.

The principle of VFD electric motor is to apply frequency conversion technology and microelectronics technology. It controls the AC motor by adjusting the frequency of the motor's working power supply, so the AC power supply and DC power supply can be used. Direct current is generally obtained from alternating current through transformer rectification, which accounts for about 95% of the total power used in human life.

2. The difference between VFD electric motor and DC motor

The VFD electric motor is a motor that runs continuously with 100% rated load in the range of 10% to 100% of the rated speed, and the temperature rise will not exceed the rated allowable value of the motor. There are many advantages of electric vfd rated motor: easy speed regulation, energy saving; simple structure, small size, easy maintenance and durability; it can achieve high speed and high voltage operation, soft start and fast braking. It has no spark, and are explosion-proof. And It is well adapted to the environment.

A DC motor refers to a rotating electrical machine that can convert DC electrical energy into mechanical energy or convert mechanical energy into DC electrical energy. The DC motor can realize the mutual conversion of DC electrical energy and mechanical energy. The two major parts of a DC motor are the stator and the rotor. The main function of the stator is to generate a magnetic field, which consists of a frame, a main magnetic pole, a commutation pole, an end cover, a bearing and a brush device. The main function of the rotor is to generate electromagnetic torque and induced electromotive force, and it consists of a rotating shaft, an armature core, an armature winding, a commutator and a fan.

The difference between vfd electronic motor and DC motor: The first electrical control equipment is that variable frequency speed regulation can only be used for speed regulation, and it has no precise control on the torque. The second is AC speed regulation. The third is that because of the brushes and volume of the DC motor it is limited in the scope of application.