Overview of Wheel Motor？

The common electric bicycle motors are called wheel hub motors, which can be equipped with spokes and rims, or integrated with rims without additional spokes. The latter is also known as integrated wheel hub motors in the industry. The former has good impact resistance and is beneficial to the motor. Generally, motors with a speed above 3000 revolutions per minute are called high-speed motors, while motors with a speed below 1000 revolutions per minute are called low-speed motors. Brushed toothless wheel hub motors can achieve speeds below 600 revolutions per minute. The country requires electric bicycles to have a speed of less than 20 kilometers per hour, which is approximately 200 revolutions per minute for a 24 inch bicycle. You can use a small gear with a large gear for reduction. The gear ratio between the large gear (driven gear) and the small gear (driving gear) is called the reduction ratio. A large reduction ratio results in high torque and strong climbing ability. Gears can be installed inside or outside the motor. Brush toothed and brushless toothed wheel hub motors are installed internally.

The freight three wheels introduced earlier have two-stage reduction. The stage is inside the series motor, and the protruding part in front is a planetary gear reduction mechanism. The planetary gear is made of nylon, and the second stage is outside the motor. The motor output is a small gear, which is transmitted to the rear axle of the three wheel vehicle through a chain, and the rear axle is equipped with a large gear. Although the reduction ratio of the turbine worm gear is large, the energy transmission efficiency is low. Straight gear reduction is cheap, but it produces loud noise; The helical gear or "human" gear has low noise and high cost. Nylon gears have a shorter lifespan than metal gears, but they are quieter and cheaper. Theory and practice have proven that: 1. The above-mentioned chain transmission and deceleration have low noise, high efficiency, easy to purchase parts, and convenient replacement. 2. The motor is installed at the rear of the shaft, making it less likely for the chain to fall off when moving forward.

The commonly referred terms' brushed without teeth ',' brushless without teeth ', and' brushed with teeth 'and' brushless with teeth 'refer to wheel hub motors with internal gears but no gears. Motors of the same power, with teeth, are more powerful than those without teeth during start-up and climbing, suitable for road conditions with slopes, and high-speed motors have higher motor efficiency. However, this type of motor has a lower lifespan, and the accessories are difficult to purchase, resulting in high maintenance costs.