The Purpose Application Of The Electric Motor

The most widely used in various motors is AC asynchronous motor (also known as induction motor). It is easy to use, reliable in operation, low in price and firm in structure, but the power factor is low and the speed regulation is also difficult. Synchronous motors are commonly used in power machines with large capacity and low speed (see synchronous motors). The synchronous motor not only has a high power factor, but also its speed is independent of the size of the load, but only depends on the frequency of the grid. The work is relatively stable. DC motors are used in occasions where a wide range of speed regulation is required. But it has commutators, complex structure, expensive price, difficult maintenance, and not suitable for harsh environments. After the 70s of the 20th century, with the development of power electronics technology, the speed regulation technology of AC motors has gradually matured, and the price of equipment has been reduced day by day, and has begun to be applied. The maximum output mechanical power that the motor can bear under the specified working system (continuous, short-time operation, intermittent cycle operation) without causing the motor to overheat is called its rated power, and the provisions on the nameplate should be paid attention to when using. When the motor is running, attention should be paid to matching the characteristics of its load with the characteristics of the motor to avoid speeding or stopping. The power that electric motors can provide ranges from milliwatts to tens of thousands of kilowatts. The use and control of the motor is very convenient, with the ability to self-start, accelerate, brake, reverse, choke and so on. Generally, when the speed of the motor is adjusted, its output power will change with the speed.