In today's video we will see how to enhance a bicycle electric motor, change
the battery and switch to a controller more powerful to get more power in the
slopes
The engine that I will use as an example is an engine of 250 w of the i mortor brand that is of the
less powerful that exist in the market but helps a lot on the slopes that is for
what I buy it.
the problem is that the original battery that is 3 amps can not stand the effort
on the slopes and after enough cycles charge the battery loses capacity, then
although it's just loaded if you accelerate like You see the little green light goes out and that means
that is not able to deliver the amps required
so I bought an 8 amp battery and there I leave the specifications that is not
bad for what it costs, it puts 15 amps of rated power
for the imortor motor model you will need an xt 30 connector that is the small one that
You see, I made a cable with the first I caught him at home, the cable is too much
thick for the connector and in that case we should reduce the section to be able to weld it
to the connector, the good thing about using thick cables is that you will not have tension drop and that is
important, otherwise, when you are going to accelerate the engine does not receive all the tension it needs,
If you do not know how to weld, you can buy the connector with the cable already soldered and it would simply be
to connect it to the thickest cable with a connector of pressure like the one you see
the battery goes out as the compartment where was the old one is very small and
does not fit
the good thing is that the battery is no longer coming down when accelerating and autonomy goes from 10
km that I had with the original battery when It was new at about 30 kms on flat without pedaling
that's not bad at all with this battery of 8 amps
change to a battery of more amps you do not will provide more power on slopes
Here we see that this hill climbs to 11 km more or less hour if we want something more power
without spending a lot of money you can change the controller and for a 350 w motor costs
about 11 or 15 euros
the controller came in a huge box but without assembly instructions, that if some
connectors came with stickers in Chinese how good already with that I had a settled life
Here we see that according to the seller supports a maximum 17 amps
well let's start with the thicker wires, Most bicycle engines are three-phase
and these three cables that you see are thicker that the rest are usually loose so in connectors
individual are the power cables of the motor, then we have other thick cables
what is the driver's feed, is say what you have to connect to the battery
They are usually black and red, negative and positive, the fine you see in the same connector is a
ignition cable of the connecting equipment to the thick positive
we can connect it to a key switch as if it were the ignition starter key
of a motorcycle and so nobody can activate the motor without the key
well we already have the thick cables identified, this controller works with or without sensors
hall that is the connector of 5 cables that you see here, the power to do without the sensors
hall makes the connection so much easier that if you are going to buy a driver choose
one that works without the hall sensors that They are on the wheel because as I say it's more
easy to connect
then finally we must look for the cables to operate the wheel either by accelerator
on the handlebar or by pedaling sensor, the connector in both cases is 3 cables so
I have them here with their stickers in Chinese I do not know anything, so I'll use the
google translator and good tells you the function of the cables but it does not tell you if it is the sensor
of pedaling or the accelerator good then I will show a little trick to get identified
the connector that we want to use
well then I got down to work looking of the controller that has the wheel so
Start by removing one of the covers but it turns out that by removing the lid what
inside was not the controller but a huge bearing that looks like a truck,
well to separate the motor from the wheel there several ways what I did is in wild mode
although I recommend at least put a wood so as not to deform the tip of the shaft of all
forms are 3 4 hammer blows because it is about remove the bearing shaft, then we have
the magnets that prevents us from taking out the engine, and there what I did was put on top of the
wheel and so the axle against the ground separated The magnets.
the truth is that the difference in size between the controllers makes me think that if the
big I cost 11 euros the small how much it must cost that it only supports 10 amps,
we connect the motor to the new cables that I have prepared and we can use a connector
pressure, these connectors have a tool special to place them but squeezing with
a pliers with care not to cut them too can be placed and they look good and we put tape
insulation or heat-insulating insulation, it is important that these cables do not short circuit
if it cuts us short the wheel and being the front wheel we have secured the fall
so be careful
when you go to assemble the wheel the magnets once they approach they have enough strength
so you also have to be careful with the fingers
well as I said before identifying the cables I doubted between two connectors the one of the assistant
to the pedaling and the accelerator both one another one works with a very small tension
from 4 to 5 volts so we can bypass two cables and if it works then
that's the handlebar throttle connector
if the wheel turns in the opposite direction it is very easy to change the turn simply change a
motor power cable by another and ready
this accelerator shows us the battery level through a red wire that goes to the positive
of the battery
even if you see the connections so bad connected is because I was trying to work
first everything is correct then it connects all good and finally we connect the fifth
and last throttle cable to fine red and so we can turn off or on from the
switch
This controller has a cable for control of cruise, that if we join it to the signal
of the accelerator stays at the speed that I had at that time.
we can even connect it to the switch but we would lose the indicator lights of
Battery
And finally I used a magnet switch like those that are usually put on doors and windows
to signal opening or closing so that stop in the case of if you leave the bicycle
in the street anyone can accelerate and burn the engine accelerating in stopped
driving the engine by accelerator is illegal at least in Spain, the engine can not
must start from stopped accelerating and according to the regulation must be triggered by the sensor
of pedals and not by an accelerator on the handlebar, So I've recorded the video in areas without
transit of cars
surely you will wonder how many watios of power manages to develop the motor,
Well, I really do not know, I have not measured it, but comparing acceleration and power
on slopes that he has now I calculate that round about 350 watts approximately
it would be 40% more but they really are numbers approximate
as for the maximum speed an engine like this of 250 w that is of the small ones
there are up to 1500 w that reach 60 km per hour and in these 250 the maximum speed
It's not going to increase a lot at the best, much the 30 km per hour but no more, and this
occurs because of the revolutions that a 250 w motor that does not revolutionize or work
empty, so if you want to increase the speed you will have to put a battery of more tension
of 48 volts in this case but already advance that are quite expensive
you also have to be careful with empowering engines of 500w or more on the front axle
then this 250 w powered on land of field sometimes you accelerate in curve and skate
a little bit the wheel so if you plan to buy a motor of 500w or more power I recommend you
you buy one of the rear wheel that goes to pull better
The truth is that I'm happy because that's what I was looking for more power to climb hills not
I want great speeds for that is the car or motorbike not a bicycle and well I hope
I have served the video I say goodbye a next video until soon
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