What is the purpose of a motor's magnet?

What is the role of magnets in electric motors?

In this article, we will discuss the role of magnets in electric motors so as to reveal the principle of magnetic field of electric motors and its applications.

A motor is a device that converts electrical energy into mechanical energy, and its basic principle is to utilize the magnetic field force generated by the phenomenon of electromagnetic induction to drive the motor to rotate. An electric motor usually consists of a stator, a rotor, and a magnet. Among them, the magnet of the motor is an important part of generating the magnetic field.

The history of electric motors can be traced back to the early 19th century, when inventors Faraday and Henry independently invented the DC motor in Europe and the United States, respectively. With the rise of the electric power industry, the types and applications of motors have become more and more extensive. in the early twentieth century, the emergence of AC motors made the scope of application of motors further expand.

Characteristics and features:

The force of the magnetic field generated by the magnets of the motor is the key factor that enables the motor to rotate. The magnet of the motor usually consists of two kinds of permanent magnets and electromagnets, of which the permanent magnet magnetic field is stable and long-lived, but the magnetic field strength is relatively weak; while the magnetic field strength of the electromagnet can be adjusted with the size of the current, but it needs to be supported by an external power supply. The magnet characteristics of the motor determine the efficiency and service life of the motor.

The application of motors is very wide, including home appliances, industrial machinery, transportation, aerospace and other fields. In home appliances, the applications of motors include washing machines, electric fans, vacuum cleaners, etc.; in the industrial field, the applications of motors include machine tools, steel, chemical industry, etc.; in the field of transportation, the applications of motors include automobiles, electric vehicles, high-speed trains, etc.

At present, the magnet materials and design technology of motors are constantly updated to improve the efficiency and performance of motors. For example, new permanent magnet materials, high-temperature superconductivity technology and magnetic levitation technology all provide new ideas and methods for the development of electric motors.

Outlook and Development

In the future, with the continuous progress of science and technology and the requirements of energy and environmental protection, the development of electric motors will tend more and more to high efficiency, energy saving, environmental protection and intelligence. At the same time, the application fields of electric motors will also continue to expand and deepen, bringing more convenience and welfare to human production and life.