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Understanding the Difference in Pole Numbers: Exploring Rotors with 2, 4, and up to 18 Poles

The pole number of a magnet rotor refers to the number of magnetic poles present on the rotor. The difference in the number of poles primarily affects the performance characteristics of the motor. Here’s a breakdown of the differences:
  1. 2-Pole Rotor: A motor with a 2-pole rotor has only two magnetic poles (North and South). This configuration is commonly found in small motors and is associated with high rotational speeds and low torque output. They are often used in applications where high-speed operation is required, such as in fans or small appliances.
  2. 4-Pole Rotor: A motor with a 4-pole rotor has four magnetic poles (North, South, North, South) distributed evenly around the rotor. This configuration provides a balance between rotational speed and torque output. 4-pole motors are commonly used in a wide range of applications, including industrial machinery, pumps, and household appliances.

    four pole ring rotor magnet
    four pole ring rotor magnet
  3. High-Pole Count Rotors (e.g., 18 poles): Motors with higher pole counts, such as 18 poles, are designed for applications that require high torque and relatively lower rotational speeds. These motors are often used in heavy-duty machinery, electric vehicles, and industrial applications where high starting torque and precise control are important.

The pole count directly influences the motor’s speed-torque characteristics. Higher pole counts generally result in higher torque output but lower maximum rotational speed. Lower pole counts provide higher rotational speeds but typically have lower torque capabilities. The choice of pole count depends on the specific application requirements, such as desired speed range, torque demands, and operational efficiency.

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Jonah Jin

Jonah Jin
Managing Director

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