What are the characteristics of permanent magnet motors?

We have previously learned about the advantages and load handling of permanent magnet motors. It can be seen that permanent magnet motors have a series of advantages such as simple structure and reliable operation. This motor also has good load handling and is used in various industries. So what are the characteristics of permanent magnet motors? The editor will introduce it in detail below!

1. The permanent magnet motor eliminates the field winding, carbon brush and slip ring structure of the excitation generator. The whole machine structure is simple. It also avoids the easy burning and disconnection of the field winding of the excitation generator and the easy failure of the carbon brushes and slip rings. A series of failures such as wear and tear, its reliability is greatly improved.

2. Small size, light weight, high specific power

The adoption of the permanent magnet rotor structure makes the internal structure design of the generator very compact, and its corresponding volume and weight are also greatly reduced. The simplification of the permanent magnet motor rotor structure also reduces the rotor inertia, increases the practical speed, and the specific power (i.e., the ratio of power to volume) reaches a very high value.

3. Good medium and low speed power generation performance

When the power level is the same, the output power of the permanent magnet generator is twice as high as that of the excitation generator at idle speed. In other words, the permanent magnet generator has the same power level as the excitation generator.

4. It can significantly extend the service life of the battery, thus reducing the battery protection work.

The main reason is that the permanent magnet generator adopts a switching rectification and voltage stabilization method, which has high voltage stabilization accuracy and good charging effect. It also avoids the shortening of battery life caused by over-current charging. The initial rectification output of the permanent magnet generator uses small current pulses to charge the battery. The same charging current has a better charging effect, thereby extending the service life of the battery.

5. High power

The permanent magnet generator is an energy-saving product. The permanent magnet rotor structure eliminates the excitation power required to generate the rotor magnetic field and the mechanical losses caused by friction between carbon brushes and slip rings, making the permanent magnet generator power have made great progress. Generally, the average power of an excitation generator is only 45% to 55% in the speed range between 1500 rpm and 6000 rpm, while the average power of a permanent magnet generator can be as high as 75% to 80%.

6. Choose a self-starting voltage regulator

No external excitation power supply is required. The generator generates electricity with just one rotation. When the battery is damaged, the car charging system can still work normally as long as the engine is running. If the car does not have a battery, you only need to turn the handle or roll the car to complete the combustion operation.

7. Especially suitable for working in harsh environments with moisture or dust.

8. No radio interference

The structure of the permanent magnet motor without carbon brushes and slip rings eliminates the radio interference caused by the friction between the carbon brushes and the slip rings; it eliminates electric sparks and is particularly suitable for operating in environments with a high degree of explosive risk. It also reduces the risk of permanent magnet motors Requirements for ambient temperature.