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A Car starter motor seems to be the obvious choice when it comes to choosing a motor, because they are very cheep and readily available from your local scrap yard, but they do have many drawbacks. The first of which is that they draw a hell of allot of current from your Batteries, this means that they will flatten pretty quickly, this type of motor has only been designed to run for a very short period of time and ‘officially’ should be rested for a long period of time to ensure a good working life! But in true Robot Wars style we don’t want a good working life, approx. 30 mins will do us! But the major hurdle is that a Series wound Starter Motor will only rotate in one direction even if you reverse it’s polarity. That is what this section is all about. Now the next page is very picture intensive and will therefore take time to download but if you want a comprehensive guide on this type of modification then it is well worth the minute or so for all of the pic's to appear. The motor in question is from a 1986 1.6 petrol Vauxhall Cavalier, you will find that most motors from this engine size will be pretty similar to the one shown here with exception to a more modern Permanent Magnet Motor which can be identified by the lack of screws in the main body, this type of motor is less powerful than the series wound type but makes up for this by having a built in Planetary reduction gearbox. If you are looking for a really powerful motor then it has to be one from a Diesel Engine, a car or small van (1.8) is ideal, anything bigger and your batteries will be flat before you know it! Below is an exploded Diagram of the motor so that you can familiarize yourself with all of the component parts. |
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