Download Microelectronics Text by Jacob Millman, Christos C Halkias PDF

By Jacob Millman, Christos C Halkias

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This, however, requires a wound secondary, and the squirrelcage type of rotor, which is the simplest, most reliable and therefore most generally used, is not adapted for the use of a starting rheostat. With the squirrel-cage type of induction motor, and always with large motors starting thus is usually done and gradually, or by lowering the impressed voltage by autotransformer, often number of successive steps. This reduces the starting in a but correspondingly reduces the starting torque, as does not change the apparent starting-torque efficiency.

Of motor, 4-6-8-POLES. 1800-1200-900 REV. Comparison of load curves of three-speed induction motor. 05 j. 0667 j. 1 j. Zi = ri + ja?! 1 Q Q Q jx<> Figs. 9, 10 and 11 show the load curves of the motor, at the three different speeds. Fig. KW. 9. -90. _80. _50. _30. 100 200 300 400 500 600 700 800 FIG, 13. with all 900100011001200130014001500160017001800 Speed torque curves of three-speed induction motor. three motors plotted on the same sheet, but with the torque in synchronous watts (referred to full speed or fourpolar synchronism) as abscissae, to give a better comparison.

There is no method of speed variation of the induction motor analogous to field control of the shunt motor, or change of the armature supply voltage by a multivolt supply system. The field excitation of the induction motor is by what may be That is, the same voltage, impressed called armature reaction. upon the motor primary, gives the energy current and the field exciting current, and the field excitation thus can not be varied without varying the energy supply voltage, and inversely. Furthermore, the no-load speed of the induction motor does not depend on voltage or field strength, but is determined by synchronism.

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