In this article you will learn to know the most important components of the Air Conditioning System
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Before we have anything light that an alternator is an electric machine, capable of generating electrical energy from mechanical energy, it is usually the drive mechanism of the motor pulleys.
Here we present one of my images of an alternator, with its main parts:
1-> Stator coil
2-> Coals box, with the coals.
3-> Output voltage regulator.
4-> Rotor winding.
5-> Rotor collector brushes.
6-> Rotor bearings.
7-> Diodes rectifies of AC-> DC
The alternator is basically a generator of three alternate phases. Yes, he did not read wrong, it is an AC generator as it arrives at his house electrical outlets, except that at the end he goes through a panel of diodes that do the job of transforming this AC energy into direct current (DC).
I will not explain here how a generator works, but if you are curious about wikipedia, there is the explanation of the Electric Generator. Basically what I will explain is the ingenious voltage regulation system.
Like any generator, it needs a variable magnetic flux to perform the generation work. The magnetic field is generated in the rotor. By the internal winding that has the same, regulated current of the battery circulates. Once the motor starts, the movement of the rotor produces the variable flow that induces the current in the three-phase stator.
The ingenious thing is that to regulate the voltage generated by the alternator, the current flowing through the rotor is varied, which is much lower and more manageable than the 50A that can generate a medium capacity stator. Then as we accelerate the motor, this current lowers to avoid generating more than 14.5V.
In this way, the alternator charges the battery while the vehicle is running, and supplies the power to all of the car's systems. The following symptoms should give you an idea that your alternator is damaged or is suffering from wear.
The defective symptom of the alternator that most drivers recognize are dim or blinking lights. This is really obvious when the headlights are turned on at night, but it is also noticeable in the dashboard lights and in the central roof light. If the lights are illuminated as the RPM increases, it is an even safer signal.
Battery light on while the engine is running
Signal that the alternator stopped generating energy.
The belt could have stretched with age and could not rotate the alternator pulley effectively, which would cause a lack of load. This usually results in a squealing noise that increases with the lighting of the headlights. On the other hand it is also due to internal bearings that are worn, causing a grunt or grinding noise.
To clear the loose belt, you can wet the alternator belt a little with an accurate water jet. This will wet it and the noise should disappear. If not, then you have bearing problems.
Weak operation of high consumption electrical equipment such as electric windows, front lights, windscreen wipers. This function is due to the existence of a regulation / generation problem.
If the engine suddenly shuts down while driving, it could be an alternator problem. The fuel injection needs a good amount of electrical energy and, without it, the engine stops quickly.
If the alternator does not generate power, the vehicle quickly consumes all the capacity of the battery (approximately in 1 hour, 20 min), leaving it exhausted and the engine will be turned off.
Alternator problems manifest themselves in several ways, depending on the particular fault. Even so, performing some simple tests at home can help you test if your alternator is damaged.
These upcoming tests will help you verify the functioning of the charging system.
1. Alternator output test
One of the most common problems in an alternator is due to worn coals. But a blown fuse in the charging circuit, a broken fuse link, a defective diode in the alternator rectifier assembly, even a worn out radamiento will affect the operation of the alternator.
Therefore, let's start by checking how much voltage your charging system is delivering.
1.1 Measuring the voltage of the battery base
Set your voltmeter to a setting of approximately 20 on the DC voltage scale, and connect the tips to the battery terminals following the correct polarity (red for + and black for -). If your battery is fully charged, it will read approximately 12.6 volts. Take note of your reading. It will use this voltage as a reference point for the next two tests.
1.2 Measurement of the "no load" generation system
-> Start the engine and let it idle.
-> Ask an assistant to keep the engine speed at approximately 1500 rpm.
-> Turn off all vehicle accessories (this is referred to as "no load").
-> Connect your voltmeter through the terminals of the battery.
-> Take note of the voltage reading.
You should get between 0.5 and 2 volts above your base voltage. Any voltage higher than this will indicate an over-voltage condition. The alternator is generating energy but the voltage regulator is not doing its job. This condition damages the battery quickly and is dangerous, since the overcharge of a battery causes overheating and violent explosion and fire.
However, if your voltage reading remains equal to or slightly lower than the base voltage, the charging system does not work. It is possible that you have a bad connection in the charging system (check that the connectors and cables are in good condition and that they are making good contact). If everything is in order, it is already an internal problem of the alternator, a voltage regulator burned, an open or burned diode bridge or very worn carbons.
1.3 Measurement of charging voltage of charging system
If the charging system passed the previous test, you should see if the charging system produces enough energy for your battery and the different electrical systems.
-> This time, ask your assistant to start the engine and increase and maintain the engine speed at approximately 2000 rpm.
-> Now, turn on all accessories such as radio, air conditioning, headlights and windscreen wipers.
-> Connect your voltmeter through the terminals of the battery.
-> Record the reading of your voltmeter.
-> Now to the reading you took, subtract the base voltage that you wrote down at the beginning.
Your charging voltage should be 0.5 higher than your base voltage. Otherwise, you may have poor circuit connections (inspect cables and connectors) or a defective controller.
1.4 Defective rectification check.
In general, a defective alternator diode will cause the headlights or instrument panel lights to flash or dim, and sometimes deplete battery power at night or in minutes. This is because part of the AC, manages to pass to the DC system for which it is not compatible.
To check if there is a possible faulty alternator diode:
-> Switch your voltmeter to a low setting (about 2 V) on the AC voltage scale (alternating current).
-> With the engine running, touch the probes of the meter to the terminals of the battery.
-> Your voltmeter should read 0 volts AC.
Any amount of AC voltage would indicate a faulty diode, so you will have to schedule to service the alternator.
Video how i do it
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