The Use and Advantages of AC Asynchronous Motors

Electric energy is one of the most important sources of energy in modern society, and motors are devices that convert electrical energy into mechanical energy. Electric motors are widely used in various industries such as machinery, metallurgy, petroleum, coal, chemistry, aviation, transportation, agriculture, and others. With the continuous improvement of industrial automation, various control motors are needed as components of the automation system. In the automatic control system of artificial satellites, motors are also indispensable. In addition, electric motors are increasingly widely used in national defense, education, medical care, and daily life (in modern home appliance industry).

The most widely used among various motors is AC asynchronous motor (also known as induction motor). It is convenient to use, reliable to operate, cost-effective, and structurally sturdy, but has a low power factor and difficult speed regulation. Large capacity and low speed power machines commonly use synchronous motors. Synchronous motors not only have a high power factor, but their speed is independent of the load size and only depends on the grid frequency. Work is relatively stable. DC motors are commonly used in situations where wide range speed regulation is required. But it has a commutator, a complex structure, high price, difficult maintenance, and is not suitable for harsh environments. Since the 1970s, with the development of power electronics technology, the speed control technology of AC motors has gradually matured, and equipment prices have been decreasing, which has begun to be used. The maximum output mechanical power that a motor can withstand under the specified operating system (continuous, short-term operation, intermittent cycle operation) without causing motor overheating is called its rated power. When using it, attention should be paid to the specifications on the nameplate.

When the motor is running, attention should be paid to matching its load characteristics with the characteristics of the motor to avoid speeding or stalling. There are many speed regulation methods for motors, which can adapt to the requirements of different production machinery speed changes. The output power of a general motor will vary with the speed during speed regulation. From the perspective of energy consumption, speed regulation can be roughly divided into two types: first, maintaining the input power unchanged. By changing the energy consumption of the speed control device, adjust the output power to adjust the speed of the motor. 2、 Control the input power of the motor to adjust its speed.

In reality, there are more and more types and models of asynchronous motors for communication, and various mechanical and electronic devices and household appliances require different motor models. Therefore, it is necessary to understand the parameters and mechanical characteristics of asynchronous motors before selecting them.