13 The following details are known about a 250 hp, 230 V, 435 r/min de shunt motor: nominal full-load current: 862 A insulation class: H weight: 3400 kg external diameter of the frame: 915 mm length of frame: 1260 mm a. Calculate the total losses and efficienc at full-load. b. Calculate the approximate shunt field exciting current if the shunt field caus 20 percent of the total losses. c. Calculate the value of the armature resistance as well as the counter-emf, knowing that 50 percent of the total lo at full-load are due to armature resista d. If we wish to attain a speed of 1100 r/r

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A: Armature resistance (Ra) = 1 Ω         Field resistance (Rf) = 145 Ω        Firing angle of…

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A: A. At light loads power supplied to induction motor consists of magnetization or reactive power…

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A: Given Data:A PMDC motor with,Electrical constant Armature resistance Input DC voltage To…

Q: Q5- Adjust a fire angle for a three-phase full-wave semi-controlled converter to feed the separately…

A: Given Vph=150 Vra=0.2 Ωkb=0.4N=750 rpmI0=40 A

Q: A four-pole induction motor drives a load at 2405 rpm. This is to be accomplished by using an…

A: The number of poles, P=4 The RPM of the induction motor, NR=2405 RPM The input voltage to the…

Q: 2.. A three-phase 60 Hz asynchronous motor runs at 890 rpm at idle and 840 rpm at full load. ww w w…

A: Frequency f= 60Hz Speed 890rpm at idle  Find the number of poles Slip at nominal speed  What happed…

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A:

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.