What is the relationship between the number of electrode pairs and the number of electrodes?

bigbat

What is the relationship between the number of electrode pairs and the number of electrodes? [Copy link]

 

1. This is an A2208 motor. It has 12 coils, which means it has 12 poles. 12 divided by 2 = 6 pole pairs. There should be 6 magnets in this motor. Am I right?

2. In a video, I saw that the 2208 motor has 7 electrode pairs. So should this motor have 14 coils and 7 magnets?

3. For motors with the same structure and volume, the more pole pairs there are, the greater the motor torque and the smoother the motor rotation.

maychang

What is the relationship between the number of electrode pairs and the number of electrodes?

I guess what the original poster wants to say is "what is the relationship between the number of magnetic pole pairs and the number of magnetic poles".

bigbat

maychang posted on 2023-8-27 19:49 [What is the relationship between the number of electrode pairs and the number of electrodes] I guess what the original poster wants to say is "What is the relationship between the number of magnetic pole pairs and the number of magnetic poles."

There must be two NSs at the magnetic poles, and no magnetic monopoles have been found yet. The problem is: when I was watching brushless motors, I came across a video saying that the motor used had 7 electrode pairs. I wanted to check the 7-electrode motor mentioned in the video, but I couldn't find such a 7-electrode motor. All I found were motors with 12 coils, so I was a little confused about the concepts of the number of electrodes and coils in the motor.

maychang

bigbat posted on 2023-8-27 20:01 The magnetic pole must have two NS, and no magnetic monopoles have been found yet. The problem is: when watching brushless motors, I came across a video saying that the motor used was 7...

[When I was looking at brushless motors, I came across a video saying that the motor used had 7 electrode pairs]

"7 pole pairs motor" is probably "7 magnetic pole pairs" or "7 magnetic pole pairs". "7 magnetic pole pairs" motors may exist, but I have never heard of them in practical applications.

"Electrode" and "magnetic pole" are two different things.

lkh747566933

I also don't understand how to calculate the pole pair number of a motor. It's a good time to learn it.

POWER_BB

In a low-power servo motor, one magnetic pole pair generally corresponds to three phases UVW, two pole pairs correspond to two sets of UVW, and so on. Mechanical angular velocity = electrical angular velocity / number of pole pairs.

the1234

The number of poles is twice the number of pole pairs. A coil has two magnetic poles, that is, a pair.

zhhc135

7 pairs of poles mean 14 magnetic poles. The more pole pairs there are, the higher the electrical frequency corresponding to the same rotation speed, that is, the more times the magnetic lines of force are cut.

lkh747566933

The number of pole pairs is half of the number of electrodes! The one in the picture should be a 12-slot brushless DC motor, and the number of stages refers to the number of magnetic steels.

lkh747566933

lkh747566933 posted on 2023-10-10 14:37 The number of pole pairs is half of the number of electrodes! The one in the picture should be a 12-slot brushless DC motor, and the number of stages refers to the number of magnetic steels

Wrong, it should be the number of permanent magnets.

fjdeepblue

The number of magnets should be the same as the number of motor poles. The magnets are attached to the stator or rotor with only one pole facing the air gap.

hebuyijiangnan

The number of windings in the motor is inconsistent with the number of poles (for example, 9 windings and 6 poles instead of 6 windings and 6 poles). This is to prevent the stator teeth from attracting and aligning with the rotor magnets, except for asynchronous motors.

lkh747566933

Your motor should be called a 12-slot N-pole motor, where N is the number of magnetic poles. The number of magnets is not 1/2 of the number of coils.