How the motor works

Update:18 May 2018
Summary:

A motor is an electromagnetic mechanical device that co […]

A motor is an electromagnetic mechanical device that converts electrical energy and mechanical energy to each other. Motors generally have two forms of application: the first is the conversion of mechanical energy into electrical energy, which is called a generator; the second is the conversion of electrical energy into mechanical energy, called a motor.

The principle of motor operation is based on the law of electromagnetic induction and the laws of electromagnetic force. When the motor performs energy conversion, it should have two major components that can perform relative motion: a component that establishes an excitation magnetic field, an induced component that induces an electromotive force and flows through an operating current. Of these two components, the stationary one is called the stator, and the one that makes a rotary motion is called a rotor. There is an air gap between stator and rotor so that the rotor rotates.

The electromagnetic torque is generated by the interaction of the exciting magnetic field in the air gap with the magnetic field established by the current in the sensed component. Through the action of electromagnetic torque, the generator absorbs mechanical power from the mechanical system, and the motor outputs mechanical power to the mechanical system.

In the design of the motor program, the first consideration is to use what kind of insulation system, whether the insulation system and the factory's technology and equipment level match, leading or lagging in the industry. The most important thing to emphasize is that it is the most important thing to do. If you do not reach the level of process equipment, you will continue to lead the way. The advanced insulation system will not produce reliable motors with reliable insulation properties.

Insulation class

Insulation class indicates the highest permissible operating temperature rating of the insulation structure, at which the motor can maintain its performance over a predetermined period of use.

Insulation system

The integrated application entity of electromagnetic wire, insulation material and insulation structure of the motor is closely related to manufacturing process equipment and technical guidance documents. It is the most confidential technology of the factory. In the evaluation of motor safety, the insulation system is regarded as a key comprehensive evaluation object.

Heat level

Within the allowable range and its divided level is the thermal rating of the motor. If this limit is exceeded, the life of the insulation material will be drastically shortened and it will even burn. This temperature limit is called the allowable temperature of the insulating material.

Temperature rise and temperature

For motor manufacturers, we are more concerned about the temperature rise of the motor, but for the use of motor end users, we are more intuitively concerned about the motor temperature; a good motor product, should take into account the temperature and temperature, to ensure the performance of the motor and Life meets requirements.