So what happens with the self exciting alternator is that the rotor, as a permanent magnet, when turned inside the stator windings, is able to supply just enough current to the voltage regulator for the voltage regulator to supply back to the rotor windings as field current, which "turns on" the rotor as an electromagnet, and we're off to the races. Therefore, if we rotate the rotor iron core permanent magnet inside the stator windings we produce an electrical current - again, a weak current (not enough to supply the vehicle's demands) but it IS enough to excite the alternator. Well, because the rotor has an iron core, if it is initially magnetized during construction (which it is), then the core alone is a permanent magnet, even without the windings (albeit a comparatively weak one). Remember when we discussed the different types of magnets, we talked about permanent magnets and electromagnets? And we said that a permanent magnet gets its magnetism because of the material from which it is made? We then talked about how the rotor of an alternator, having an iron core with field windings around it, is an electromagnet. It uses a special voltage regulator that senses alternator RPM and when it is low (as in when starting the engine) it uses the residual magnetism in the alternator's rotor fields to supply the initial field current until the alternator comes up to speed and alternator output takes over as the field current supply. Instead of a dedicated wire supplying field current to excite or "start" the alternator, this design is "self-exciting". The short answer is, of course: "The same way every other alternator does." The real question is - how does it get the four "elements" using only a single wire? Here's how: The relevant section in regards to 1 wire alternators: It seems it should be seriously simple.and maybe I'm overthinking things here.ī-Alternator Bible Tech Article by BillaVista There is also two spade connectors under a rubber cap but these seem to be for a SI alternator (not sure what thats all about to be honest). I also read that there is usually a ground wire from the alternator but the instructions don't mention it, although there is a terminal (top right of picture) which is more of a 'bolt'. What are peoples thoughts on this? (I'm easy either way although it means the nice new cable I bought won't reach the battery) Well ok then.īefore it arrived I was reading other people fitting these and some were running the cable to the positive on the solenoid rather than directly to the battery. The instructions for fitting are very straight forward - connect a wire from the red terminal on the rear of the alternator to the positive on the battery. I'm hoping this removes the horrible high pitch whine that the car started doing.hoping it was the bushes in the old alternator as I tried everything else (belts, power steering pump etc) The bosh appears to have also been an internal regulated alternator as their is no voltage regulator in the car. I'm putting this in my 66, replacing a Bosch (urgh) alternator that someone had put in the car before I got it. The delivery gods smiled on me today with the arrival of my new 1 wire alternator.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |