I welcome fans to craft, I propose to consider a simple electric bike with a 48V engine. The motor is used brushless, with a capacity of 350 watts, this is enough to accelerate to 40 km / h. On a bicycle, you can switch 4 gears, and we have a gear motor and has quite good torque for these purposes. The author starts off quite quickly, eats homemade from four batteries of 12V / 7 Ah each. Unfortunately, such a rework leads to the fact that bike can only be driven by the engine, so you must always responsibly approach the battery level. If the project interests you, I propose to familiarize yourself with it in more detail!
Materials and tools used by the author:
Material List:
- 48V / 350 Watt gearless brushless motor (480 rpm);
- controller for brushless motor;
- electronic gas handle;
- batteries (to obtain a voltage of 48V);
- wires;
- plastic clamps;
- Suitable drive sprocket;
- bolts with nuts;
- double sided tape;
- a little sheet metal for mounting batteries;
- a piece of the profile pipe and rubber handles for the steering wheel (for the steps);
- And, of course, the experimental bike.
By the way, a ready-made kit for installation is possible.
Tool List:
- grinder;
- welding machine;
- drill;
- spanners;
- puller for connecting rods (preferably);
- paint.
The process of manufacturing an electric bike:
Step one. Engine preparation and installation
Installing the engine is the most difficult task in this homemade product, everything else is already a formality. First we need to remove the connecting rods with pedals, we do not need them. Cranks can sit quite firmly so as not to hit them with a sledgehammer, it is better to use a puller.
Next, we determine the appropriate place for installing the engine on the frame, it is important for us that nothing interferes with the chain. The author immediately installed a drive sprocket on the engine shaft, he simply welded it to an existing one. We will mount the engine in three ears, this should be enough. We mark the places on the frame with a marker and clean them with a grinder. We weld the bolts here, they will serve as studs for mounting the engine. We paint the bolts and the weld points so that the metal does not rust, that's all, now we fasten the engine with nuts. As a result, it remains to put on the chain, it is quite possible that it will not be necessary to modify it.
We check how everything works, the author uses 4 batteries of 12V each as a power source, with a serial connection we get 48V. We connect the controller according to the colors of the wires, as well as connect the "gas" knob. Everything works, the wheel spins very quickly in idle mode.
Step Two Battery pack
The author used rather large-sized and heavy batteries with low capacity, if they are replaced, the bike will become lighter, more powerful, and the driving distance will increase. The author uses 4 batteries, they need to be glued together with double-sided tape and installed on the base. As a basis, a sheet of metal is used, which is screwed to the frame with bolts welded to it. We glue the batteries, it is advisable to secure them with a rubber, rope or wire.
Step Three Final touches and testing
At the end, we install a controller for a brushless motor on a double-sided tape and connect the wiring. We fix the wires on the frame with plastic clamps. The author also brought out a socket for connecting to the battery charger.
We install a phone holder on the steering wheel so that you can measure the speed, and go to the test.
Of course, you need to put your feet somewhere else, we make a step from the profile pipe. We weld it to the frame, paint, and put rubber handles or pieces of hose on the ends.
The author started off quickly and abruptly, but the speed of the bike is not very quick, the maximum speed was 40 km / h. In principle, this is not motorcycle and not even a moped, so such indicators are more than enough. By traction, the bike should be quite powerful. That's all, the project is over, I hope you liked the home-made, and you found something useful for yourself. Good luck and creative inspiration, do not forget to share your ideas and homemade things with us!
