What type of motor is the hub motor? What are the main classifications?

The principle of in-wheel blender motor is rare earth permanent magnet synchronous motor, wheel-side motor, in-wheel motor" refers to the motor with different parts of the motor installed in the car.

The technology of in-wheel motor is also called the technology of built-in motor in the wheel. Its major feature is that the power system, transmission system and braking system equipment are integrated into the wheel rim, and the mechanical equipment of the electric vehicle is greatly simplified. change. The in-wheel motor technology is also known as the in-wheel motor technology. Its major feature is that the driving force, transmission system and braking system equipment are integrated into the wheel rim, thus greatly simplifying part of the mechanical equipment of the electric vehicle.

The in-wheel motor propulsion system software is mainly divided into two structural forms according to the rotor form of the motor: inner rotor type and outer rotor type. Among them, the outer rotor type adopts a low-speed outer rotor motor, the maximum speed of the motor is 1000-1500r/min, there is no deceleration device, and the speed of the wheel is the same as that of the motor.

For the inner rotor type, a fast inner rotor motor is used, and a reducer with a fixed reduction ratio is configured. In order to obtain a higher power density, the speed of the motor can be increased by 10000r/min. With the advent of a more compact large planetary gear reducer, the inner-rotor in-wheel motor is more competitive than the low-speed outer-rotor in terms of power density.

Types of motor magnetic fields are classified:

The driving motor of the in-wheel motor system software is divided into two types: axial magnetic field and radial magnetic field according to the type of motor magnetic field. Compare the following:

(1) The structure of the radial flux motor is more conducive to the release of heat, and its motor stator can be used without an iron core;

(2) The bearing force between the stator and rotor of the axial flux motor is relatively balanced, and the equivalent circuit is obtained by the ferrite core, and the technology is simpler and more perfect.

The motor types of the in-wheel motor are divided into rare earth permanent magnet, magnetic induction, and power switch magnetoelectric type. Its characteristics are as follows:

(1) The magnetic induction (multi-thread) motor is simple in structure, durable, cheap in cost, reliable in operation, small in torque pulsation, low in noise, without phase sensor, and high in speed limit; the defect is that the optocoupler circuit is complicated and the cost increases , Compared with rare earth permanent magnet motors, multi-thread motors have high efficiency and slightly lower power density;

(2) The brushed motor rare-earth permanent magnet synchronous motor can choose a cylindrical axial magnetic field structure or a disc radial magnetic field structure, which has high power density, high efficiency and wide speed change range, and has a very broad development prospect. , has been used in a variety of electric vehicles around the world;

(3) The power switch magnetoelectric motor has the characteristics of simple structure, cheap manufacturing cost, good speed/torque characteristics, etc., and is suitable for pure electric vehicle driving; the defect is that the design scheme and operation are very difficult and meticulous, and the operation noise is large.