Is it better to have more magnetic poles

is it better to have more magnetic poles

magnetic poles

With the development of science and technology, motors play an increasingly important role in our life and work. In motor design, the magnetic pole is one of the important factors. So is it better to have more magnetic poles? This article will explore this.

 

motor poles

 

1. Definition of Magnetic Pole

 

The magnets are placed in different positions and pass through the bridge coil after being connected to the power supply. The place where the magnetic field generated in the coil is stronger is called the magnetic pole. The magnetic pole in the motor refers to the area with a strong magnetic field on the permanent magnet or electromagnet carried by the rotor of the motor.

 

2. The influence of magnetic poles on the motor

 

The number and distribution of magnetic poles have a great influence on the performance of the motor. The more poles, the higher the speed of the motor, but the lower the torque of the motor. Conversely, the fewer poles, the slower the motor will spin, but the motor will have more torque.

 

3. Application scenarios of motors with different numbers of poles

 

1. General low-speed high-torque motor

 

For motors that require high torque, the number of poles will generally be relatively small. For example, the number of magnetic poles of motors usually required in fields such as mining and reeling machines is generally 2 to 4 poles. Because this kind of motor needs to output more torque at a fixed speed.

 

2. Synchronous motor

 

Synchronous motor is a motor with stable speed and high output power. The number of poles of this motor is generally 4~30 poles. The working principle of the synchronous motor is to realize the power conversion by the magnetic field interaction between the magnetic steel on the rotor and the coil on the stator.

 

3. Electric vehicle motor

 

Electric vehicle motors need both high torque and high speed. Therefore, a relatively large number of magnetic poles is generally required. For example, Tesla's car motors generally have 8 to 12 poles.

 

4. Optimization of the pole pair motor

 

The number of magnetic poles is a very important factor for the performance of the motor, but the number of magnetic poles cannot be simply increased, and needs to be optimized according to the usage scenarios of the motor. At present, some studies have shown that by optimizing the magnetic field distribution and the number of magnetic poles, the motor can more effectively reduce the loss of the motor and improve the efficiency at the same speed or torque.

 

In summary, the number of poles is a critical factor in motor design. Different motor application scenarios require different numbers of poles. Increasing the number of magnetic poles of the motor can increase the speed of the motor, but will reduce the torque of the motor. Therefore, the optimization of the number of magnetic poles needs to be personalized according to the usage scenarios of the motor to optimize the performance of the motor.