{"id":88,"date":"2018-08-09T13:45:01","date_gmt":"2018-08-09T13:45:01","guid":{"rendered":"http:\/\/commons.princeton.edu\/64-tiger-cub\/?page_id=88"},"modified":"2018-08-14T13:58:07","modified_gmt":"2018-08-14T13:58:07","slug":"key-components","status":"publish","type":"page","link":"https:\/\/commons.princeton.edu\/64-tiger-cub\/electrical\/key-components\/","title":{"rendered":"Key Components"},"content":{"rendered":"
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Alternator<\/h3>\n
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The Alternator is made up of the stator and the rotor.\u00a0 The stator is six coil windings connected in series. \u00a0Each of the coils has a different number of windings.\u00a0 The rotor is a six pole magnet that is attached to the engine sprocket.\u00a0 As the rotor spins, a combination of the different number of coils of the stator produce different levels of voltage, which in turn power different parts of the bike. \u00a0The high voltage output, for example, could be used for powering the spark plug while the low voltage output could be used for the brake light.<\/p>\n<\/div>\n<\/div>\n

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On the left is the spinning magnet of our stator tester, which acts like a rotor. On the right is our stator, consisting of six different coils.<\/figcaption><\/figure>\n<\/div>\n
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The Points<\/h3>\n<\/div>\n
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The points act as a physical switch to regulate the timing of the spark plug. \u00a0As the motor spins, the cam (the slightly oval piece in the middle of the picture below) spins with it. \u00a0The purpose of the cam is to open the points at the appropriate time. \u00a0It does this by pushing the hammer-like piece back each turn. \u00a0Adjusting the cam correctly is very important because the points must be precisely timed to spark the spark plug at the proper time and prevent pre-ignition. \u00a0At high speeds, small weights on the centrifugal advance mechanism also advance the timing of the points and makes the spark plug fire slightly earlier. \u00a0This compensates for the fuel having less time to burn as the engine reaches higher speeds.<\/p>\n<\/div>\n<\/div>\n

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The Coil<\/h3>\n<\/div>\n<\/div>\n<\/div>\n
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The coil consists of two coil windings.\u00a0 It is a transformer that provides the step-up voltage obtained from the points needed to spark the plug. \u00a0When we received the bike, it used a battery ignition coil system. \u00a0Because a battery provides DC current, the old coil was a DC coil. Now, our bike uses an energy transfer system, so it uses an AC coil. \u00a0The coil operates on the principle of induction which is covered in the Physics Review section.<\/p>\n<\/div>\n<\/div>\n

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