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Thread: electric magnetism for propulsion

  1. #1 electric magnetism for propulsion 
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    Why is it not possible to have a shaft connected to a generator so when this shaft spins it turns the generator creating current to magnets that surround this shaft. The shaft will ride on a current of air NO BEARINGS.
    The other end of the shaft could also be connected to a power source. As the shaft OPPOSITE POLES ON SHAFT FROM THE ELECTRO MAGNETS spins faster should create more rpms and more energy.
    Would like someone to explain the why nots. If there is a problem with output or something then that specific link should be eliminated.


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  3. #2  
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    If your trying to get something for nothing, or even the same amount of something then it will never happen.

    First you had better put that entire thing in a vacuum or you will have friction caused by the surrounding air. Second you had better use a superconductor or you will lose power in the coil windings. Third I'm pretty sure your magnetic bearings are going to use up some power.

    In the end, no matter what you do you'll end up with less then you started with.

    By the way they do use magnetic bearings for some applications, they have been for years. They are capable of very very high RPM's. The trick is to get the balance flawless.

    I'm sure some others will explain things I've missed, like Edie currents..etc.

    Edit:

    Perhaps I've missed the goal your trying to achieve?


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  4. #3 magnetic power 
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    So if the generator as it spins faster to put more energy out but the magnetic field remains constant a level of more energy out than used could be achieved? Plus if the propulsion shaft might not need to remain perfectly in line if wobbling could be made uneventful. Could this shaft not only be attached to a generator but also to an axle drive?
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  5. #4  
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    I guess I don't really understand your goal here. Free energy?
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  6. #5  
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    I think I'm with you on this one, 'buck3547'.
    Are you thinking along the lines of producing electricity by incorporating small generators on each wheel axle?
    If so, I consider it to be feasible, and would be interested to hear the 'negatives' about such an idea.
    The principle is the same as that on a wind farm. Here, the air turns the blades which then turn over a 'motor' (generator) to produce electricity.

    On a car the wheel turns the shaft, which then turn over a 'motor' to produce electicity.
    It is not 'free' energy as such: More like 'recoverable energy' that is not being utilised at the moment.
    A car could be designed on a hybrid basis consisting of a small combustion engine, and electrical generators on each wheel.

    While the car is being propelled by the combustion engine, the wheels are being turned anyhow, and so that motion could be converted into electrical energy, and stored, or used to supplement the combustion engine, enabling a true, self-charging, hybrid engine.
    What do you think?
    jrey
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  7. #6  
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    Quote Originally Posted by jrey
    I think I'm with you on this one, 'buck3547'.
    Are you thinking along the lines of producing electricity by incorporating small generators on each wheel axle?
    well, the generator would produce resistance. the car would have to use more power to move the wheels AND the generator. more gas would be used. you would just have the same amount of power, stored electricly. and you would need batteries, so you would lose a little power because of the weight. it would be cheaper to plug in your car than pay for the extra gas.
    I don't suffer from insanity, i enjoy every minute of it

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  8. #7  
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    Quote Originally Posted by jrey

    While the car is being propelled by the combustion engine, the wheels are being turned anyhow, and so that motion could be converted into electrical energy, and stored, or used to supplement the combustion engine, enabling a true, self-charging, hybrid engine.
    As has been said, your generators would cause mechanical resistance, at the end there is a slight increase in energy consumption, as mechanical resistance > electrical output

    However, Hybrid vehicles's computers sometimes order the batteries to be recharged while driving on the freeway. This increases the consumption temporarily, but then more energy is saved in city traffic (stop and go) where the electric engine is extremely efficient.

    Also, Hybrids recharge batteries when the vehicle is braking. Instead of only brake pads creating friction on the disc, the generator in mechanically connected to the axle, which creates an important resistance...vehicle slows down and recharges the battery.

    Purely mechanical systems exist too, one of them uses a cylinder that uses brake force to fill it with air. Once the vehicle is stopped, the cylinder is full of compressed air, which can be used to push the car back to speed (for a few seconds). I ignore which system is more efficient.
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