The motor is one of the common electrical appliances in work and daily life. What is the difference between the variable frequency motor and the ordinary power frequency motor?

The motor is an electromagnetic device that relies on the principle of electromagnetic induction to realize the energy and transmission of the motor. Its main function is to generate driving torque as a source of electrical or mechanical power.

Both ordinary motors and variable frequency motors are a kind of asynchronous motors. Its working principle: The stator winding of the motor is a three-phase winding that is symmetrical in space. When a three-phase symmetrical AC current is added to the stator winding, it will A rotating magnetic field is established inside the motor, and the rotating magnetic field cuts the rotor winding, thereby generating an induced current in the rotor winding, and the current-carrying rotor will generate an electromagnetic force under the action of the stator rotating magnetic field, thereby driving the motor to rotate.

Inverter motor and ordinary power frequency motor are more common motors, and what are the advantages of inverter motors compared to ordinary motors?

1. The variable frequency motor can work at very low frequency and voltage. And it can be started without inrush current. The various braking methods provided by the inverter can be used for rapid braking to realize frequent starting and braking. Because the variable frequency motor can achieve harsher operation and harsher operating environment than ordinary motors. Therefore, in the manufacture of variable frequency motors, it has a higher insulation level than ordinary motors, a forced cooling system (built-in cooling fan), stronger mechanical strength in structure, better rotor bearings and longer than ordinary motors. service life.

2. We all know that ordinary motors can only work under the condition of power frequency of 50 Hz. If the frequency variation range is too large, the motor will seriously heat up or even burn the motor. However, the variable frequency motor can be adjusted arbitrarily within the speed regulation range without damage. Under normal circumstances, the variable frequency motor can work continuously within the rated speed regulation range under the condition of full rated load, and the temperature rise of the motor will not exceed the rated value of the motor.

3. Although the price up-conversion motor is slightly more expensive than the ordinary motor, its advantages are very obvious. The AC speed regulation mode of frequency converter and frequency conversion motor can greatly improve the degree of mechanical automation and production efficiency. Moreover, the soft start function of the frequency converter also reduces the impact of the large current on the power grid when the ordinary motor starts, and saves more energy than the ordinary motor.

As the prices of frequency converters and frequency conversion motors continue to drop, the application of frequency conversion motors will become more and more extensive.