How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

For converting a bicycle into an electric bicycle, special sets with motor wheel. This is a decent budget solution, but it does not allow you to achieve normal movement speed. The wheel motor on a flat road allows you to accelerate to a maximum of 30-35 km/h. Higher-speed sets are difficult to find, and they are expensive, so you can get out of the situation by installing 4 775 electric motors instead of a motor-wheel. They have high torque and develop up to 9-15 thousand rpm. This will allow you to accelerate the bike on a flat road to 70 km/h.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Materials:

  • freerunner (ratchet);
  • big star;
  • electric motor 775 – 4 pcs. - ;
  • corner bracket for engine 775 – 4 pcs. - ;
  • sprockets with a landing diameter on the motor shaft - 5 pcs.;
  • bicycle chain;
  • wires;
  • battery;
  • controller for electric bicycle;
  • speed controller;
  • heat shrink;
  • nylon ties.

Converting a bicycle to an electric bicycle

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

The small rear sprocket of the bicycle needs to be replaced with a large one.It must be equipped with a ratchet so that the wheel can rotate after the engines are stopped.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Let's put the wheel back in place.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Next you need to weld the mount for the motors. It consists of 4 standard angle brackets for 775 engines.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

They are welded together and welded to the rear fork of the bike, as in the photo. Then the first motor is installed in the mount. It is equipped with an asterisk on the frame side.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Before this, its shaft is machined under the pin. A stock shortened bicycle chain is tensioned between the large rear sprocket and the small one on the engine. Next, the remaining 3 motors are installed.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Then 4 sprockets need to be placed on the motor shafts on the front side of the welded block.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

After this, they are connected by a common circuit. As a result, all engines will create torque together and, through the shaft of the first motor, transmit force to the rear wheel. In this case, the pedals can only serve as footrests, since the chain is not connected to them.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

The motor power terminals must be connected to the electric bike controller.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

Considering the total parameters of the engines, it is unlikely that it will be possible to find such a powerful controller for control. In this case, you can use 2 controllers, each of which will regulate the power level of 2 motors. All electrical equipment is attached to the bicycle frame with nylon ties.

The power battery is also mounted on the frame, and the speed controller is located on the steering wheel.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

In this form, the electric bicycle is already capable of riding. In the future, after testing the performance of the selected electrical equipment, the wiring, controllers and battery can be hidden in a case.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h
How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

To start moving, you need to turn the speed control and the bike will start moving.The speed should be increased gradually so as not to bend the shaft on the first motor. Before you start using your electric bike on a regular basis, you need to equip it with powerful disc brakes. It is important to never brake when the engines are running. Ideally, install a specialized gas and brake handle to adjust the speed, in which case the ride will become more convenient. When braking, the controller itself will turn off the motors.

How to make an electric bicycle with 4 low-power motors that accelerates to 70 km/h

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Comments (6)
  1. Alexey Misharin
    #1 Alexey Misharin Guests 20 February 2020 18:03
    2
    Up to 70 km/h
    On December 24, I fell at 24 km/h and broke my leg. I'm still healing. 😀👍
  2. Guest Vitaly
    #2 Guest Vitaly Guests 20 February 2020 20:15
    3
    A worthless shaitan-arba. Everything is open, dust, dirt and water flies straight into the engines.
  3. shishkin09
    #3 shishkin09 Guests February 21, 2020 09:52
    2
    I wonder how many minutes will it take for the engines to start leaking?!
  4. Engineer
    #4 Engineer Guests 25 February 2020 14:53
    3
    Structurally, it’s complete garbage; it might be enough to drive 10 km. Riding a bike at a speed of 70 km/h is suicide.
  5. dkflbvbh
    #5 dkflbvbh Guests 22 March 2020 14:23
    3
    Why are there small stars?.. What kind of controllers?.. Why is it not said that the first engine has an extended shaft?..
  6. Ashot
    #6 Ashot Guests 29 March 2020 22:31
    2
    I watched the video... The collective farm is the creepiest, of course. Screeds, uncooked seams on thin metal, etc. If it was done for fun somewhere at work in one evening to kill time, then I approve. If you want to travel all the time - well, fuck it...