car aternator wave form shape before changed to a d.c?

Question

does anyone know what wave form shape is on a car alternator BEFORE it is changed to d.c ...is it like a saw tooth,square wave,full sine wave,half sine wave,distorted sine wave,probably non of these.

Answer 1

Starts off as variable frequency FULL SINE WAVE >> (rectifer) HALF SINE WAVE >> (smoothing) Fairly flat SAW TOOTH >>charges battery

Answer 2

There are twelve winding in an alternator which are wired together to give three phases of output. Each phase will produce a sinewave; these will peak as the rotor field passes their respective stator poles in turn. The sinewave of each phase is therefore present and equally separated by 120 degrees. The windings will produce a sinewave whilst there is no current being drawn from the output, or if the load is purely resistive. When a diode bank is connected however, current is only drawn when alternator voltage is greater than that of a battery connected to it. As the sinewave voltage rises the diode is reverse biased by the battery voltage and no current is drawn, this is a no load condition and the voltage rises quickly but when the battery voltage is reached the diode becomes forward biased and current flows into the battery this loads the winding and drags the voltage down effectively clipping the top off the sinewave. So what we see is a near pure sine with no load conditions, which will progressively change toward a square wave as the current drawn increases. The diode bank provides full wave rectification giving a positive output for both positive and negative excursions and with all three phases superimposed. As this produces 6 peaks per cycle the DC output is almost continuous with a ripple caused the peaks of the sinewaves.

Answer 3

I think tht are all a version of sine wave, but the profiles change from type to type, If your battery is in good shape and large enough this is no problem but some cars are marginal and the lights and most annoying Instrument lights pulse or flicker, Magnetti Marelli were bad, some were badged Lucas, and the only answer if the fluctuations annoy is a) A large Capacitor, 2" round 6" long 35 volts or thereabouts in paralell with the Battery. b) a bigger battery or c) a better alternator.
We had this on an Austin and old Ernie sent back the roller bearing Marelli badged Lucas alternator and fted a Birmingham built Lucas 27ACR I believe intended for an Austin Ambassador which cured the problem. Lancias and Fiats also seem to be afflicted by this problem.

Answer 4

An alternator would usually have a sine wave output. From there, there are various methods of rectifying this into a form of direct current during which you could have the effects you mention. These are, like, full wave rectification, half wave rectification, and soon. Depending on how important it is to have the cleanest D.C., the more you have to do to rectify into as clean a DC as possible. To charge a car battery, you probably won't need it too clean, but perhaps for a piece of hospital equipment, you would probably need the DC to be as near to perfect as possible.

Answer 5

you're able to alter oil AND clear out each and every 3 to 6 thousand miles. the undertaking with no longer doing it is that oil gets grimy, in spite of a clear out and the combustion technique contaminates the oil with acid. permit it bypass long sufficient and the clear out clogs so there's no filtration of dirt and steel debris and the acid builds to the point that it eats away engine aspects best to early engine failure. while you're having to function oil usually then you definately the two have a leaky gasket someplace or the acid and dirt have worn aspects to the factor that your engine is burning oil. in case you spot a bluish smoke popping out of your exhaust you're burning oil.

Answer 6

sine wave(?)

Answer 7

full sinusoidal wave