Because it has more advantages than disadvantages. y1=y1+4y2, y2=3y12y2y_2^{\prime}=3 y_1-2 y_2 When looking at the box, you should see six wires, three on each side. From above Eq. By staying here you are agreeing to our use of cookies. Also in order that the induced emf in the field at the starting may not be too high, the field turns provided are few in number and the excitation voltage is kept low. Hazardous location classes and groups- Key information is required to accurately specify an electric motor for use in hazardous environments, those areas where fire or explosion hazards may exist due to the presence of flammable, combustible or ignitable substances. The speed of the rotating magnetic field is known as synchronous speed (NS). Find and evaluate OEMs, Custom Manufacturers, Service Companies and Distributors. The external resistance can easily connect with the rotor circuit through the slip-ring and brushes. But it never catches it. A motor with 208 volts in the voltage field with the 230/460 V points, then the motor must meet efficiency and NEMA amps and torques also at the208 V point. (1.37) in Eq. (1.38), we have-, For motor operation, R2 in the above Eq. The phenomenon which causes the rotor speed to lag the speed of the RMF is known as slip, as is expressed as: where Nr is the speed of the rotor, and Ns is the synchronous speed of the rotating field (RMF) of the stator. The speed of the rotating magnetic field is known as synchronous speed (NS). Three-phase "Y" connection has three voltage sources connected to a common point. And it draws more current. For example, a motor with a 1.0 service factor cannot be expected to handle more than its nameplate horsepower on a continuous basis. Before uploading and sharing your knowledge on this site, please read the following pages: 1. - The service factor shown on the motor nameplate indicates the amount of continuous overload the motor can be expected to handle, under nameplate conditions, without overheating or damaging the motor. Compensated Induction Motor 6. Stepper Motors vs. Servo Motors - What's the Difference? The rotor slots are made fewer in number and larger in size.
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