An elementary book on electricity and magnetism and their applications . hy is it sufficient to insulate the copper bars in the squirrel-cage rotor only lightly ? 272. Single-phase induction motor. If a polyphase induc-tion motor is running and if one terminal is disconnected, it 400 ELECTRICITY AND MAGNETISM will continue to run and carry its load. Why use a polyphaseinduction motor then instead of a single-phase motor? First,it costs less to build a polyphase motor of a given output thanit does to build a single-phase motor of the same , the polyphase machines are more efficie
An elementary book on electricity and magnetism and their applications . hy is it sufficient to insulate the copper bars in the squirrel-cage rotor only lightly ? 272. Single-phase induction motor. If a polyphase induc-tion motor is running and if one terminal is disconnected, it 400 ELECTRICITY AND MAGNETISM will continue to run and carry its load. Why use a polyphaseinduction motor then instead of a single-phase motor? First,it costs less to build a polyphase motor of a given output thanit does to build a single-phase motor of the same , the polyphase machines are more efficient. Finally,the single-phase motor has of itself no starting torque andhence will not start from a standstill unless provided withspecial starting devices, which make its construction morecomplicated and expensive than a polyphase machine of thesame rating. There are several devices which are used to start the single-phase motor, since there is a real field for the single-phase Starting Winding Starting Windingn , . , „ in Circuit Rotates with Rotor* Running Winding. V Connection Block Spring
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectmagnetism, bookyear19
