I was speaking generically of small engines, including outboards, motorcycles, etc. For example, regulated alternators didn't appear on outboard motors until the mid-eighties, when increased electrical power demands necessitated higher-output alternators.
Shunting regulators are quite common on motorcycles, and I assume that's the design used on most small engines. It's really the only way you can implement a regulator using SCRs. Silicon-controlled rectifiers are curious devices: you can turn them on but not off. (A triac is just two SCRs back-to-back in parallel.) The behavior of SCRs isn't a problem when switching ac, since the signal turns itself off every half cycle. Now in the case of lighting dimmers, SCRs are used exactly as you describe: the SCR is triggered partway through the half cycle, so only a portion of the waveform is passed to the load. But lighting dimmers are open-loop devices with no feedback loop. Voltage regulators are closed-loop devices; they need a means of turning the power OFF as well as on. Since an SCR can't turn off, the solution is to short out the stator output using the SCR as a shunt.
The link below has the schematic for a rudimentary shunting regulator, and a good discussion of the theory of operation.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
... [Read Article]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
