Producing 200W of Manmade Power! Bike Generator Upgrade with your comments!
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Date: 2021-06-20
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Comments and reviews: 10
Power
8: 30 This is an old washing machine motor. Many modern units use BLDC or PMSM pancake motors. (Brushless DC, with trapezoidal back EMF, or Permanent Magnet Synchronous Machine, with sinusoidal back EMF) They require a special controller to work right.
I wonder if you could use a Synchronous Reluctance motor also. Or even a 3 phase induction motor. Induction motors really hard (as you know) to turn into generators. You need to keep the rotor excited by controlling the load impedance. If you connect up the 3 phase machine to a grid (a grid offering very low impedance rotating phasor that is not easily impacted by power drawn or delivered, and then run it above synchronous speed, power will be generated instead of consumed. I don't think it is easy or possible operate such an induction machine stable with no such grid or an unpredictable load.
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8: 30 This is an old washing machine motor. Many modern units use BLDC or PMSM pancake motors. (Brushless DC, with trapezoidal back EMF, or Permanent Magnet Synchronous Machine, with sinusoidal back EMF) They require a special controller to work right.
I wonder if you could use a Synchronous Reluctance motor also. Or even a 3 phase induction motor. Induction motors really hard (as you know) to turn into generators. You need to keep the rotor excited by controlling the load impedance. If you connect up the 3 phase machine to a grid (a grid offering very low impedance rotating phasor that is not easily impacted by power drawn or delivered, and then run it above synchronous speed, power will be generated instead of consumed. I don't think it is easy or possible operate such an induction machine stable with no such grid or an unpredictable load.
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Low
Trouble here is you are using a half assed tool to do the job. you need a stool with a heavy flywheel. Not a bike. A bike is designed to propel you forward. It's not a comfortable position. Doesn't use all your weight. You need to redesign from scratch a machine that is for making power. Like an exercise machine for doing specific muscle. With a large flywheel. It will keep your power more consistent and you can take breaks because the flywheel will keep spinning. I wouldn't put the flywheel between your legs either. You would be able to get the flywheel spinning to 5-7000rpm and rest when it lowers to 3000rpm. So many advantages to adding the flywheel.
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Trouble here is you are using a half assed tool to do the job. you need a stool with a heavy flywheel. Not a bike. A bike is designed to propel you forward. It's not a comfortable position. Doesn't use all your weight. You need to redesign from scratch a machine that is for making power. Like an exercise machine for doing specific muscle. With a large flywheel. It will keep your power more consistent and you can take breaks because the flywheel will keep spinning. I wouldn't put the flywheel between your legs either. You would be able to get the flywheel spinning to 5-7000rpm and rest when it lowers to 3000rpm. So many advantages to adding the flywheel.
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Lucas
In normal activity, a typical human runs at around 100W, and under exercise, about 400W. If you managed to get 200W out of this thing, that's 50% efficiency, which is crazy!
Science tip: you can calculate how much your power production goes up by simply exhaling your breath inside a garbage bag when you are at rest, and compare how long it takes to fill this garbage bag when you are exercising. Humans are generators, they take food (basic sugar, burn it, and produce carbon dioxide as the result. We are essentially fires, and running a bike generator is equivalent to running a conventional generator in biodiesel.
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In normal activity, a typical human runs at around 100W, and under exercise, about 400W. If you managed to get 200W out of this thing, that's 50% efficiency, which is crazy!
Science tip: you can calculate how much your power production goes up by simply exhaling your breath inside a garbage bag when you are at rest, and compare how long it takes to fill this garbage bag when you are exercising. Humans are generators, they take food (basic sugar, burn it, and produce carbon dioxide as the result. We are essentially fires, and running a bike generator is equivalent to running a conventional generator in biodiesel.
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Greg
Maybe a GM alternator with voltage sense. My 2003 Chevy pickup 2500 has one I had to diagnose and replace, Or maybe thats what your using. One thing I do to check the alternator function in Most GM trucks is check and change the voltage. Some are GM 3 or 4 wire. I think it is kind of like a PID loop. I can tell you I change the voltage from the ECM to the alternator and I will get higher voltage and amps. With a lower voltage in I get more volta and amps. I don't think there is brain box in the alternator. I think its just voltage going to and from the ECM
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Maybe a GM alternator with voltage sense. My 2003 Chevy pickup 2500 has one I had to diagnose and replace, Or maybe thats what your using. One thing I do to check the alternator function in Most GM trucks is check and change the voltage. Some are GM 3 or 4 wire. I think it is kind of like a PID loop. I can tell you I change the voltage from the ECM to the alternator and I will get higher voltage and amps. With a lower voltage in I get more volta and amps. I don't think there is brain box in the alternator. I think its just voltage going to and from the ECM
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Lewis
Honestly 200W is pretty impressive, and likely the most you could really expect to get out of this system. Professional cyclists, for example, can supposedly generate in the order of 400W (based on a minute of research, so 200W seems like a pretty respectable result.
About the only improvements you could make to the system are in reliability and consistency instead.
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Honestly 200W is pretty impressive, and likely the most you could really expect to get out of this system. Professional cyclists, for example, can supposedly generate in the order of 400W (based on a minute of research, so 200W seems like a pretty respectable result.
About the only improvements you could make to the system are in reliability and consistency instead.
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Terrance
Well you have the right Idea now use the bike gearing to make wind work for you. simple 4X8 sheet can provide a slow rotating Dutch like wind mill. Well not use it as wind mill but as Wind turbine.
This depends on your adventure skills and yes get a carpenter to help you. I do recommend that as week end project. You have the bases and the correct configuration.
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Well you have the right Idea now use the bike gearing to make wind work for you. simple 4X8 sheet can provide a slow rotating Dutch like wind mill. Well not use it as wind mill but as Wind turbine.
This depends on your adventure skills and yes get a carpenter to help you. I do recommend that as week end project. You have the bases and the correct configuration.
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dos
Securing the bike wheel better and reducing flex will improve efficiency. See bike trainers to see how they attach bikes (e. g. via the axle rather than zip ties. The flex between the wheel and generator also burns energy. Some automotive tensioners might work more effectively (with light springs.
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Securing the bike wheel better and reducing flex will improve efficiency. See bike trainers to see how they attach bikes (e. g. via the axle rather than zip ties. The flex between the wheel and generator also burns energy. Some automotive tensioners might work more effectively (with light springs.
reply
Kenneth
Want more power? Lower losses in the generator chain by using bike chain vs Vbelts. Vbelts depend on friction to work, chain does not. Many decades of experimentation for reduced loss has gone into bicycles. Move the alternator closer and make extend the bike chain to it.
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Want more power? Lower losses in the generator chain by using bike chain vs Vbelts. Vbelts depend on friction to work, chain does not. Many decades of experimentation for reduced loss has gone into bicycles. Move the alternator closer and make extend the bike chain to it.
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Ed
I got 400W out of my pedal powered generator but its perhaps slightly more efficient than this setup. I'm using a permanent magnet generator I built for a wind turbine.
200W isn't that bad considering such alternators can be only 50% efficient.
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I got 400W out of my pedal powered generator but its perhaps slightly more efficient than this setup. I'm using a permanent magnet generator I built for a wind turbine.
200W isn't that bad considering such alternators can be only 50% efficient.
reply
Henri
You should ty to make some kind of vertical axis wind generator. They are relatively easy to build (at least the Savonius rotor. They are not the most efficient but are independent of the wind direction and can be used in urban environments.
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You should ty to make some kind of vertical axis wind generator. They are relatively easy to build (at least the Savonius rotor. They are not the most efficient but are independent of the wind direction and can be used in urban environments.
reply
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