Welcome to my electronic blog,
my name is Hariyanto Lim and this is my diary to learn about electronic.
 
  1. 2008-09-14 23:24:04 (Generator) [15]
    Magnetic circuit

    A good magnetic circuit involves steel between the poles with a gap (the airgap) where we need to utilize the field. In an alternator, our wires should occupy the airgap, it should be no wider than necessary, and every other part of the magnetic circuit should be of steel.

    We can either use steel laminates (laminated steel reduces eddy currents) or we can have magnets on each side of the coil(s) moving together with steel behind them.

  2. 2008-09-14 23:15:30 (Generator) [14]
    Thin wire coil with more wound is more efficient than the same volume of thicker wire coil of less wound

    http://www.otherpower.com/otherpower_wind_tips.html

    An alternator that uses many windings of thin wire will have better low-speed performance than one that uses fewer windings of thicker wire, but higher internal resistance.

    This means it will become inefficient more quickly when producing higher amperage as wind speeds and power output rise. The formula used to calculate power wasted from inefficiency is AMPS^2 * RESISTANCE = Power wasted as heat in the alternator windings (in watts).

    When coils are connected in series, the voltage increases and so does resistance.
    When coils are connected in parallel, voltage stays the same but amperage increases and resistance decreases. Also, parallel connections in an alternator can cause current to flow where you don't want it to, called 'parasitic losses.'

    SELF NOTE: it imply the coil best is more wound with less resistance (ohm), so it can generate high voltage with high current ampere, therefore matching between wire thickness and ampere produced must be well ... perhaps 0.6 mm wire thickness for up to 10 ampere of any given voltage.

  3. 2008-09-14 22:39:33 (Generator) [11]
    Description of words and terms use on generators

    rotor = rotating magnet.
    stator = stationary set of conductors wound in coils on an iron core.
    cogging = condition where the magnets attract the metal cores of the coils, if cogging too strong then it's hard to get the rotor turning.

  4. 2008-09-14 22:32:09 (Generator) [13]
    Tips and Hints from the Internet

    http://alton-moore.net/wind_turbines.html

    There is no rule saying that you must have the same amount of magnets as you do coils. Almost any configuration will do, as long as any given set of coils are simultaneously actuated. It's not going to do much good to run a magnet by a coil if the next coil in the chain is not similarly actuated; you can see the sense in that. Similarly, don't have one string of 6 magnets actuated and another string of 6 connected in parallel with it unactuated. To keep power from "bouncing around" we need to use it or accumulate it in some manner right after making it.

    Making 3-phase power is popular because 3 single phases add up well together and are therefore easier to rectify into purer DC. 6 magnets spinning past 18 coils would make 3-phase power, for example, where every third coil is connected in series to form one of the phases. I am not a great fan of 3-phase power generation in wind turbines because it is more difficult to run through transformers and the like. I like to play around with electronics, however, and if you merely want to generate power and immediately rectify it to DC then 3-phase is just fine.

  5. 2008-09-14 21:33:28 (Generator) [12]
    Design on generator using pulley system

    Use a SMALL but strong DC brushed motor can generate good torque,
    and using rubber belt pulley technique to rotate the LARGE alternator (rotating magnet to induce wound coil)

  6. 2008-08-30 10:25:13 (John Bedini's pulse battery charger) [10]
    Battery status should be either charging (receive energy) or discharging (give energy) ... can not be both

    Aaron post in http://www.energeticforum.com/renewable-energy/1676-bedini-sg-mechanical-open-close-switch.html
    ====
    You can use this to charge a cap, disconnect the input circuit then discharge cap back to input. THIS IS NOT WHAT THE BATTERY LIKES...but this is how it can be done mechanically. There are other uses for this. Perhaps 1/2 the circle can be to power the SG from the cap, disconnect, power from battery, disconnect, repeat.

    I used this switch to discharge a cap back to the front battery. The voltage goes up and continues to do so for even up to 1-2 days...appearing to be a self runner until it damages the input battery...either charge them or power from them but not both.
    ====

    The Bedini system is using 2 batteries, one for power and other for charge,
    it is implied that currently there is no such battery which can work continuously give/receive energy for a long time.

  7. 2008-08-29 16:09:00 (Generator) [8]
    Modern Tread Mill Machine

    Some people already created tread mill work out machine which can generate energy,
    they use large circular plate like in wind turbine.

    So I have idea for the tread mill machine vendor (manufacturer) to create mass consumer machine
    that if the user use it then they can watch TV (in front of them while running) which power is generated from the machine.

  8. 2008-08-29 15:28:17 (John Bedini's pulse battery charger) [3]
    Fan bedini

    I have converted 2 small computer case fans which are 80mm and 120mm,
    the 80mm actually has more coils turn than the 120mm.

    Both are running well, and currently I am trying to make a good permanent housing for the circuit.

    Harry second Bedini charger using 120mm computer case fan

  9. 2008-08-29 15:22:40 (Generator) [4]
    Testing 1 phase motor/generator

    I use a low power DC motor with 1.2v AA battery,
    the motor is from the vibrator of a computer joypad.

    I have attached to the motor a CDrom which has 4 large magnets (N-S-N-S),
    and make it close to the 6 coils of 200 turns each which using 0.3mm (AWG 28) enamel wire.

    The output of the coils is rectified with double voltage multiplier,
    it can light up a 3v LED, the LED is blinking.

    Based on this experiment, I feel that the 1.2v AA battery can light up the 3v LED,
    but I think the power waste is more than input, so it is NOT generate Coefficient Of Performance (COP) > 1

    six coils of 200 turns each with 28 awg (0.3mm) enamel wire

  10. 2008-08-29 15:10:34 (Generator) [7]
    Stepper torque motor from broken scanner

    I have cracked open a stepper motor from a dead scanner, I was suprised to see the inside of it,
    at first I expect to see many coils because this motor is hard to move and therefore I assume has many small magnets and coils.

    What I found there was totally no coils at all, just magnets on the ring like dc brushless fan,
    and the rotor is made up of many small magnets of N-S-N-S ... it maybe up to 20 or more magnets.

    The motor has 5 cable out, after I use rectifier to see the output power,
    it can generate a good amount of power, I use a capacitor to store the energy,
    and I can hand crank it to get 50V ... yeah, it is fifty volt !!

    For each single wind (hand crank), I can make a small motor spin (run),
    it is obviously can produce a lot of motor BUT unfortunately the motor is very hard to wind,
    I have to use scale gears to get 1:10 circle.

    I wish this motor can be wind easily, but then again as with other motor,
    if the motor can be winded with hand easily (less torque) then the produced power is not much.

  11. 2008-08-29 14:54:12 (John Bedini's pulse battery charger) [6]
    Description Bedini Pulse Charger Motor

    John Bedini has created a patent of his invention,
    which he call it a lead acid battery pulse charger.

    The lead acid is the perfect and the only recommended battery to be use with the Bedini charger,
    because the charger which consist of coild and monopole (magnets arranged in such a way to be all North out or South out) rotor,
    with the help of NPN transistor like 2N3055 which pulsing the charged battery,
    it can produce voltage spike (Bedini call it radiant energy) which is suitable for lead acid battery.

    The voltage spike is a high voltage and it is not necessary with high ampere,
    this spike will soften (reduce) the acid sticked to the plate which normally occurred after long period of use,
    therefore many people have tried to bring back a dead acid battery using this Bedini charger.

  12. 2008-08-29 14:37:38 (Generator) [2]
    Use motor to run generator

    Standard normal motor can not run generator in hope to get more energy,
    the reason is because the motor waste energy when it induce the magnetic field to run the rotor,
    and then the magnet in generator can not induce (generate) more energy into the coils.

    But I have read a few articles that some people have found a way to make an over unity motor/generator design,
    I will try to make my own motor/generator design.

  13. 2008-08-29 14:31:38 (Generator) [1]
    Trying to achieve COP > 1

    I found a new motor, it is from a small vaccuum cleaner, it is rated 4.8v
    the motor is DC motor with slip ring (brush), so it should be power efficient.

    I have to supply it with 1.2v AA rechargable battery and it spin nicely,
    and also it produces a good torque.

    I will try to use this low power motor to generate as many as possible energy with my generator design,
    which has 9 coils of 40 turns with 1mm (AWG 18 ?) enamel wire with 3 phases star connection.

  14. 2008-08-29 14:21:34 (Generator) [5]
    Coil Design

    The coil's area which should be against the magnetic flux should be small than the magnet's width and length.

    The design should be very similar to motor, ie: the small coils face area are smaller than the magnet area.

 
ELEC.OTAK.INFO
Created By OTAK INFO 		add new entry


Got questions ? send to elec (at) otak (dot) info