How many pole pairs in a geared hub motor?

Pole pairs are an important feature of electric motors that are used to determine the speed and torque output of the motor. In this article, we will explore the concept of pole pairs and how they relate to geared hub motors, a type of electric motor that is commonly used in electric bicycles, electric scooters, and other small electric vehicles.

What are Pole Pairs?

An electric motor consists of a series of wire coils that are arranged around a central core. These wire coils are known as "windings," and the central core is known as the "stator." When an electric current is applied to the windings, it creates a magnetic field that interacts with the magnetic field of a rotating part of the motor known as the "rotor." This interaction between the magnetic fields causes the rotor to rotate, which is what drives the motion of the motor.

The number of poles in an electric motor refers to the number of north and south magnetic poles that are present in the stator. The number of pole pairs in a motor is equal to the number of north and south poles divided by two. For example, a motor with six north and south poles would have three pole pairs.

How Do Pole Pairs Affect the Speed and Torque of an Electric Motor?

The speed and torque output of an electric motor are closely related to the number of pole pairs in the motor. In general, a motor with a higher number of pole pairs will have a slower speed but higher torque output, while a motor with a lower number of pole pairs will have a higher speed but lower torque output.

This relationship between pole pairs and speed and torque is known as the "speed-torque curve." By plotting the speed and torque output of a motor at different load conditions, it is possible to create a graphical representation of this curve, which can be used to determine the optimal operating range of the motor.

How Many Pole Pairs Are in a Geared Hub Motor?

Geared hub motors are a type of electric motor that is specifically designed for use in electric bicycles, electric scooters, and other small electric vehicles. These motors are characterized by their compact size and ability to deliver high torque at low speeds, which makes them well-suited for use in these types of vehicles.

The number of pole pairs in a geared hub motor can vary depending on the size and type of motor. However, most geared hub motors have a relatively low number of pole pairs, typically ranging from two to four. This allows them to deliver high torque at low speeds, which is important for propelling the vehicle up hills and other inclines.

Conclusion

Pole pairs are an important feature of electric motors that are used to determine the speed and torque output of the motor. In general, a motor with a higher number of pole pairs will have a slower speed but higher torque output, while a motor with a lower number of pole pairs will have a higher speed but lower torque output. Geared hub motors are a type of electric motor that is specifically designed for use in electric bicycles, electric scooters, and other small electric vehicles. These motors typically have a low number of pole pairs, typically ranging from two to four, which allows them to deliver high torque at low speeds.