VARIABLE-FREQUENCY INVERTERS Inherently, ac motors are not as well suited to variable-speed applications as aredc motors, because their speed cannot be satisfactorily controlled by simple supplyvoltagevariation. Reducing the supply voltage to a 60-Hz three-phase inductionmotor will reduce its speed all right, but it also drastically worsens the motor’sspeed-regulating ability. That is, an ac induction […]
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