The 2 kinds of motors of electric bicycles were introduced to you guys in my last post, see: An Introduction To Electric Bike Engine-Hub Motor & Central Engine. And now I’m gonna compare them in detail as a reference for you to help you pick right what you need, here we go.

 

 

Let’s take a look at the hub motor first.

ebike hubmotorThe hub motor, by its meaning, amounts to the place of the wheel hub of a bicycle, both can be seen in front-wheel or rear wheel, and nowadays the most common type on electric bicycles is the Brushless Direct Current hub motor.

amounted in the rear wheel

 

The basic principle is:

  1. The battery feeds current to the motor
  2. Current inspires up electric-magnetic field inside the motor
  3. The electromotive force between Stator and Rotator drives the rotator to spin, which means the axle that is connected to the rotator starts to spinning,
  4. Bang! Our electric bicycle starts to go forward!

 

For your information, our electric bikes are mainly equipped with hub motors, check our product line to know more

 

Now the mid-engine, take this Bafang BBSHD engine, for example,

ebike mid drive motorit replaces the conventional crank, how does it work? First of all, it is still a DC Brushless Motor, only because it is placed in the position of cranks, so it has to fit the shape of the frame, so the electrical principle is the same as the hub motor.

The First 3 steps are the same as a DC Brushless hub motor,

  1. The battery feeds current to the motor
  2. Current inspires up electric-magnetic field inside the motor
  3. The electromotive force between the Stator and Rotator drives the rotator to spin, which means the shaft that is connected to the rotator starts to spinning
  4. Then, the chain that connects to the rear wheel leads it to spin,
  5. Bang! Our bicycles go forward.

 

 

Figuring out the working principles of the 2 kinds of motors is not enough, we need to know what are pros and cons of them, here’s a table that for you to see directly,

 

Mid Drive VS. Hub Drive
Items Hub Drive Mid Drive
Power Max. 1000 watts for now Top to 5kw
Torque Greater torque and more natural riding feels with torque sensor Less than mid-drive, torque feedings are not as natural as mid-drive, mainly because of using the speed sensor instead of the torque sensor
Sensor Torque sensor Most with speed sensor
Weight Balance The motor in the middle has better weight distribution than the hub Not as good as mid-drive
Stress On The Chain Heavier stress on the chain is more likely to break on a mid-drive than on a hub drive especially

when climbing stiff hills

Lighter stress than mid-drive
Price Expensive Cheap
DIY Access(Conversion choice) Has to find a frame that matches the motor, thus the freedom and access are limited Most regular bicycles can be converted into an electric bicycle

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