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Working of synchronous motor is elaborately explained in this video animation. This video explains how constant speed characteristics of synchronous motor is achieved, and why they are not self starting and use of damper winding to make them self start. Use of Synchronous motor as synchronous condenser is also explained here.
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Neodymium magnets fall very slowly in copper tubes with thick walls, but also in aluminum tubes, which are more easily obtainable from DIY shops. The magnet’s slow falling behaviour is due to Eddy currents generated by the falling magnet. I tried to measure these very small currents using a high sensitivity digital multimeter, coupled to a PC, and indeed was able to show small current spikes, superimposed on a “background”current probably generated by Galvani potential difference. The moment the slow falling magnet passes the test leads fixed to the tube, a current spike is visible. Its value, positive or negative, depends upon the orientation of the magnet north pole with respect to the leads.