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  • , the automotive car alternator is also another popular choice among many do-it-yourself people for use as a low voltage DC generators for wind turbines. However, being a an automotive alternator bolted to the side or a combustion engine, they require high rpm speeds to generate power and are not always very efficient. Car alternators also require an external power supply voltage to power the electromagnets that create the internal magnetic field.

    Car alternators limit their own current using a built-in regulator circuit which also stops the alternator from overcharging the connected batteries. However, an automotive alternator should never be connected to the battery bank in reverse or run the alternator at high speeds without the battery connected, as the output voltage will rise to high levels (much more than 12 volts) and destroy the internal rectifier.

    Low voltage stand alone wind power DC systems are great for charging batteries etc, but if we want to power larger mains connected appliances or have a system that is “grid-tied” we need to either use some form of inverter to change the low voltage DC generated by the permanent magnet DC generator into a higher voltage (120 or 240 volts) AC supply, or install another different type of wind turbine generator.

    In the next tutorial about Wind Energy, we will look at the operation and design of a different type of electrical machine called a


  • 17 Comments » for Permanent Magnet DC Generator
    1. svvit svvit says:

      Hi.
      Pls look at the idea.
      startup.ua/en/projects/411997.html
      She may like and be interested!
      For the evaluation and like, a special thanks:)
      Thanks.

    2. sudhanshu malhotra sudhanshu malhotra says:

      sir i want to make fuel less generator with permanent magnet alternator and slip ring induction motor, would it be possible to get electricity from this by connecting them through pulleys and for starting them we can use batteries or some external power

    3. sushma sushma says:

      is any constraints for WIND SPEED FORECASTING STUDIES

    4. Rupu Rupu says:

      If I use pmdc generator for wind turbine out put voltage is constant or not Out put voltage is dependent on speed or not

    5. dwayne schoetmer dwayne schoetmer says:

      I have 3 15 HP Permanent Magnet, DC Motors. They are rated at 180 Volts. They are in good working condition. Are they valuable as DC Generators to anyone???? I don’t think I will use them & do not want to scrap them

    6. Dave Dave says:

      I beg to differ on the DC output….all coils going through a field coil put out a sine/cosine wave which in turn causes voltage…magnetism…decay of magnetism in both sides of the + or – sides of the magnets 180 degrees out from each other…
      The build of the wave of power and the decay of the wave of power and magnetism collapse creates a bell curve of power that goes through the zero point of power before making the opposite side of the zero line.
      Basically all generation is AC and then through diodes….one way switches of either plus or minus for the coils being charged with a North or a South pole do we rectify the power to a DC current….called a bridge rectifier…
      Hope that helps more than hurts but this is the basic theory that should be understood!

      • The flaw in your argument is that you forgot to mention the commutator and brushes, or even lap and wave winding configurations. This also is the basic theory of DC generators that should be understood!

    7. abirami abirami says:

      Generators are power generation appliances that supply electrical power during a power outage and prevent discontinuity of power activities or disruption of business operations. Generators are available in different electrical and physical specifications for use in different applications.

    8. Arkcantos Arkcantos says:

      It is a very informative knowledge given in this page, but just I want to clear my mind from some question. Some of the guy I know told me that any PMDC motor/generator is giving an output of AC voltage. I’m puzzled as through my common knowledge, it suppose to be a dc voltage output. Please explain. By the way, is there any possible to make (DIY) a pure sine inverter (DC to AC) circuit? Thank you.

      • As its name implies, a Permanent Magnet DC (PMDC) generator is a continuous current machine. A DC machine, called a Generator, has a commutator generating a continuous DC supply. Whereas an AC machine, called an Alternator, has slip-rings generating a sinusoidal supply.

        There are numerous schematic diagrams available on the internet regarding DIY circuits for pure sinewave inverters.

        • Arkcantos Arkcantos says:

          Thanks a lot. That is a great yet informative explanaition. Btw, I am sorry for this late reply.

        • Arkcantos Arkcantos says:

          You really help me, especially my companion who said that he wanted to build a green energy machine works like a hydro-dam.

    9. christopher Judge christopher Judge says:

      the information is very rich and appropriate. what is the price for the DC Generator

    10. sriram sriram says:

      There is any mechanical rotation torque losses occur

      • Yes, as with any rotating machine there will always be mechanical losses due to windage losses, bearing friction losses and the connected load creating a drag torque.

    11. Netgain Netgain says:

      The brushed series DC motor is the most affordable and readily available current production motor for road-going conversions available today. Brushless DC motors require expensive controllers. Permanent magnet motors are very efficient, but only in a very narrow rpm band, and quickly lose their efficiency in the varying speeds of normal driving. Shunt and compound motors are more expensive to build and have poorer acceleration than series motors. For these reasons, the brushed series DC motor is the motor of choice for DC systems.

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