Which Motor Type is the Best Generator? DC, BLDC or Stepper? (Experiment)
video description
Edit: electrical motors and the general field of Electrical Drive Systems (EDS) is actually a hugely complex study
Date: 2020-09-05
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Comments and reviews: 9
Erik
The general conclusion might be right, but what the biggest flaw was in this analysis is that you did not use a variable load. All these motor types want to put out a certain voltage according to their speed and a certain current according to their torque. If you dont draw the appropriate current for a given rotation speed, you are either drawing too little current and not much of the available energy is really converted into electrical power whereas mechanical friction is not reduced. Or you are drawing too much current and your winding losses are bigger than they should be. Each motor has an optimal current draw depending on speed en motor constant, but if you use a power resistor you effectively fix the current for each voltage, meaning that this is partially an experiment testing what motor constant is best suited for using with the fixed resistor. Therefore you should ideally have a dc-dc converter in order to transform your load to that of the optimal value as seen by your generator.
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The general conclusion might be right, but what the biggest flaw was in this analysis is that you did not use a variable load. All these motor types want to put out a certain voltage according to their speed and a certain current according to their torque. If you dont draw the appropriate current for a given rotation speed, you are either drawing too little current and not much of the available energy is really converted into electrical power whereas mechanical friction is not reduced. Or you are drawing too much current and your winding losses are bigger than they should be. Each motor has an optimal current draw depending on speed en motor constant, but if you use a power resistor you effectively fix the current for each voltage, meaning that this is partially an experiment testing what motor constant is best suited for using with the fixed resistor. Therefore you should ideally have a dc-dc converter in order to transform your load to that of the optimal value as seen by your generator.
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DDS
hi Scott I have a question I would like to be able to stir my coffee beans around in a bowl when they are toasted and need to be cooled down the bowl has a diameter of about 20 centimeters and contains 600 grams of coffee beans, I will then hang a motor over the bowl where there is a wing connected to the shaft of the engine that touches the beans round until they are cold, I thought it is probably not that many rpm, do you have an
idea for the engine and is 12 voltsthanks Rene
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hi Scott I have a question I would like to be able to stir my coffee beans around in a bowl when they are toasted and need to be cooled down the bowl has a diameter of about 20 centimeters and contains 600 grams of coffee beans, I will then hang a motor over the bowl where there is a wing connected to the shaft of the engine that touches the beans round until they are cold, I thought it is probably not that many rpm, do you have an
idea for the engine and is 12 voltsthanks Rene
reply
Jordan
I love your videos, and seem the right guy to help solve my problem. I would like to use a BLDC motor on a winch to lower a heavy weight. As it does so I want to control the speed and maintain the speed of the lowering of the heavy weight. Right now when the weight engages, it accelerates the motor to a very high velocity. I know it has the power and the torque, but how to make it a brake with controllable speed? Please help.
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I love your videos, and seem the right guy to help solve my problem. I would like to use a BLDC motor on a winch to lower a heavy weight. As it does so I want to control the speed and maintain the speed of the lowering of the heavy weight. Right now when the weight engages, it accelerates the motor to a very high velocity. I know it has the power and the torque, but how to make it a brake with controllable speed? Please help.
reply
jhsevs
I just got an idea. Building a pedal powered ebike with a generator in the crank, instead of a chain drive, derailleurs and freewheeling mechanism. Could this be more efficient, since there would be fewer mechanical parts? It would also be really interesting to try to build an electronic substitute for a gearbox using a VFD.
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I just got an idea. Building a pedal powered ebike with a generator in the crank, instead of a chain drive, derailleurs and freewheeling mechanism. Could this be more efficient, since there would be fewer mechanical parts? It would also be really interesting to try to build an electronic substitute for a gearbox using a VFD.
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ModernCollector
Very informative video! Liked! Curious if you can answer a quick question. What is the significance of the stepper motors coil resistance rating? Does a higher number for resistance mean its harder to turn - for example a 32 Ohms motor would require more force to spin than one rated at 1. 5 Ohms? Thanks!
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Very informative video! Liked! Curious if you can answer a quick question. What is the significance of the stepper motors coil resistance rating? Does a higher number for resistance mean its harder to turn - for example a 32 Ohms motor would require more force to spin than one rated at 1. 5 Ohms? Thanks!
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G. K.
2 years back I had made a hand generator for Mobile phone & camera charging for extreme survival. I found stepper motor is the best for making generator as it gives about 16-20 v at lowest rpm wrt dc motor. I used this voltage to charge Li Ion battery with buck converter and battery protection modules.
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2 years back I had made a hand generator for Mobile phone & camera charging for extreme survival. I found stepper motor is the best for making generator as it gives about 16-20 v at lowest rpm wrt dc motor. I used this voltage to charge Li Ion battery with buck converter and battery protection modules.
reply
Stephen
i just use 24 pedal assist and gears with chain then i connect motor to motor so i watched your video for motor efficiency but it doesn't matter as long as it make more then the original 24 volts i am happy. i win. i got 32 volts with two not so good ones.
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i just use 24 pedal assist and gears with chain then i connect motor to motor so i watched your video for motor efficiency but it doesn't matter as long as it make more then the original 24 volts i am happy. i win. i got 32 volts with two not so good ones.
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Able
With 2 motor connect each other and input a small voltage in the first motor and get a output that more than the input voltage use that voltage. To get start the frist input motor for free energy by charging into battery
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With 2 motor connect each other and input a small voltage in the first motor and get a output that more than the input voltage use that voltage. To get start the frist input motor for free energy by charging into battery
reply
Daniel
How do I convert Kv to volts? I cant find a solid answer anywhere. Some people say you divid by something while others say you simply cant convert the two units. I want to know how many colts are in 3500 kvs
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How do I convert Kv to volts? I cant find a solid answer anywhere. Some people say you divid by something while others say you simply cant convert the two units. I want to know how many colts are in 3500 kvs
reply
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