One is the positive output and the other is the excitation wire. A general generator only needs two wires to operate normally. Today's cars have very high demands on electrical power management. The simple design of the past can no longer meet the operating requirements of modern cars, so the generator design also strives for excellence.
D+ is the generator excitation and is also the connection for the battery charge light on the dashboard. DFM is the power management signal line. It is responsible for monitoring the generator load so that the engine computer can increase. engine speed at any time to adapt to load requirements.
Working principle
When the external circuit feeds the excitation winding through the brush, a magnetic field is generated, causing the magnetisation of the claw pole into N pole and S pole. When the rotor rotates, the magnetic flux changes alternately in the stator winding. According to the principle of electromagnetic induction, it can be seen that an alternating induced electromotive force is generated in the three-phase winding of the stator. This is how an alternator produces electricity.
The main motor (i.e. motor) drives the rotor of the synchronous generator excited by direct current to rotate at a speed n (rpm), and the stator winding three-phase induces an alternating potential. If the stator winding is connected to an electrical load, the motor will produce alternating current. The alternating current will be converted to direct current through the bridge rectifier inside the generator and output from the output terminal.
I have a generator. I used a test pen to see that both wires are on. One is strong and the other is weak. I thought it wastwo live wires, but it works. I heard from others that the generator was emitting. That's right.
The generator can indeed operate with only two wires connected. Of course, the voltage between the two wires must meet the requirements.
What we call the neutral line is because this line is connected to the ground wire of the transformer and theoretically maintains zero potential, which is why it is called the "neutral line". Portable generators do not necessarily require a neutral wire.
I used a test pen to see that both lines are lit, one is strong and the other is weak. The strongest is the live wire and the weakest is the neutral line. This will happen during use. an electronic test pen because the accuracy is higher. When measuring the neutral line, the induced electricity will also be measured. It is normal for the neutral line to have induced electricity. L'Single phase alternator only produces live and neutral wires. There are no two live wires.