![]() ![]() The two basic connections for a self-excited DC machine are the “Shunt Wound DC Generator”, in which the main field winding is connected in parallel with the armature. Typical DC Generator ConstructionĪ simple DC generator may be constructed in a variety of ways depending upon the relationship and interconnection of each of the magnetic field coils with respect to the armature. In a permanent magnet DC generator, the armature rotates so the full generated current must pass through a commutator or slip-rings and carbon brushes arrangement providing electrical power at its output terminals as shown. The rotating armature coils pass through this stationary, or static magnetic field which in turn generates an electrical current in the coils. Electrical power is taken directly from the armature via carbon brushes with the magnetic field, which controls the power, being supplied by either permanent magnets or an electromagnet. This means that they have output coils that rotate with a stationary magnetic field that produces the required magnetic flux. Generally with conventional DC machines, the field winding is on the stator and the armature winding is on the rotor. If however, we mechanically rotate the armature at a speed higher than its designed motor speed by using rotor blades, then we can effectively convert this DC motor into a DC generator producing a generated emf output that is proportional to its speed of rotation and magnetic field strength. If we connect a DC machine to a direct current supply, the armature will rotate at a fixed speed determined by the connected supply voltage and its magnetic field strength thereby acting as a “motor” producing torque. This then makes the permanent magnet DC generator (PMDC generator) ideal for use as a simple wind turbine generator. In fact, the same PMDC machine may be driven electrically as a motor to move a mechanical load, or it may be driven mechanically as a simple generator to generate an output voltage. Permanent magnet direct current (DC) machines can be used as either conventional motors or as DC wind turbine generators as constructionally there is no basic difference between the two. There are many different configurations for an electrical generator, but one such electrical generator which we can use in a wind power system is the Permanent Magnet DC Generator or PMDC Generator. (electro-motive force) into the generators coils as it rotates. This energy conversion is based on Faraday’s laws of electromagnetic induction, that dynamically induces an e.m.f. ![]() We know from the previous wind turbine tutorial, that an electrical generator is a rotational machine that converts the mechanical energy produced by the rotor blades (the prime mover) into electrical energy or power. Now time to step on the casing and pull the stator using a plier, sure you are going to need some fore doing that.Permanent Magnet DC Generator Permanent Magnet DC Generator as a Wind Power Generator Pull the back plate and remove the tyre with a screw driver. Next, we dissassembles the motor with the six flat head screws on the back of the motor. The bulb should make a decent glow, now you can do that with the other remaining wire as well. Now attach a 12v bulb on any two of the three thick wire and give the motor a quick spin by hand. Most of the times these motors are in good condition but just to make sure they are in working condition, mount the motor on a bench with the shaft using a clamp. Now with all the factors in mind we have dissassembled a hioverboard and get our hands on one of the motor. Now this factor is important for a wind generator as even with slight gusts of wind we can get voltage that can get the system working. The reason for using a permanent magnet hub motor is the fact that you dont need to worry about the brushes wearing out as in a brushed motor and their effiency, which is far better than a similar size brushed motor.īesides that these hoverboard motors can produce good voltage even when handcranked. Yes the generator, for that we have decided to use a brushless hub motor and the one that we found was from an old hoverboard, as these days you can easily find one arround in a scrap yard. ![]()
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