What is an electric motor?

Release time

2022-08-11 11:31

A motor is a device that converts electrical energy into mechanical energy. The electric coil (ie stator winding) is used to generate a rotating magnetic field, which acts on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric rotating torque. Motors are divided into DC motors and AC motors according to the power usage. Most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the stator magnetic field speed of the motor does not keep synchronous speed with the rotor speed). The motor is mainly composed of a stator and a rotor. The direction of the force in the magnetic field is related to the direction of the current and the direction of the magnetic line (magnetic field direction). The working principle of the motor is the action of the magnetic field on the current, which makes the motor rotate.

The life of the motor is related to various factors such as insulation deterioration, friction loss of sliding parts, and functional failure caused by bearing deterioration, etc., and most of it depends on the bearing condition. There are two types of bearing life: mechanism life and lubricating oil life. bearing life

1. Lubricating oil caused by thermalizing lubricating oil life

2. Work fatigue caused by machine life

Motors In most cases, the effect of heat on the life of the lubricant is greater than the effect of the weight of the load added in the bearing on the life of the machine. Therefore, when the life of the motor is estimated by the life of the lubricating oil, the temperature that has the greatest influence on the life of the lubricating oil is the temperature, which has a great influence on the life time.

Various faults often occur in electric motors during long-term operation. For example, the transmission torque of the joint with the reducer is large, the connection holes on the flange surface are severely worn, and the fitting clearance of the connection increases, resulting in uneven transmission of torque. After the motor shaft bearing is damaged, the bearing bit is worn. Wear between shaft heads, keyways, etc. After this kind of problem occurs, most of the traditional methods are mainly repaired after welding or brush plating, but both have certain drawbacks.

The thermal stress caused by the high temperature of repair welding cannot be completely eliminated, and it is easy to bend or break. Brush plating is limited by the thickness of the coating and is easy to peel off. The above two methods use metal to repair the metal, which cannot change the "hard-hard" cooperative relationship, and will also wear again under the combined action of various forces. In response to these problems, modern western countries have adopted a large number of repair methods of polymer composite materials, and applied a variety of unprocessed technical products, which have comprehensive properties such as excellent adhesion and excellent compressive strength. The application of polymer material repair is not affected by the thermal stress of welding, and the repair thickness is not limited. At the same time, the concessional nature of the metal material of the product absorbs the shock and vibration of the equipment, prevents the possibility of re-wear, prolongs the life of the equipment parts, saves considerable downtime for the enterprise, and creates huge economic value. .

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