To make the control system open for motoring & generating, we shall consider that only torque vs speed is performed. In core, a functional generator produces the desired torque versus speed curve desired from the IG (Fig 5.2-a to Fig 5.2-c). For motor starting, the torque vs. speed may decrease notably with speed (Fig 5.2-a)
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FERROMAGNETISM
Ferro-magnetism is very commonly used type of magnetism. Ferromagnetism is found on the Bar magnets, compass needles, and the coating on magnetic hard disks. It is a fine property of iron, cobalt, and compounds of these few other metals which includes nickel, chromium and magnesium. All these stated materials shows ferromagnetic properties because the spins of the electrons cancel out much less than in other materials. Groups of spinning electrons align readily with an external magnetic field, thus forming magnetic domains. This alignment is permanent so that the material becomes magnetized, & remains so, even when we remove the external field.
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