1. How much voltage is generated due to residual flux in the poles? 2. How much voltage is generated at no-load with field resistance Rf1? 3. How much voltage is generated at no-load with field resistance Rf2? 4. Which line represents a field resistance higher than the critical field resistance? How much voltage does the machine generates at this field resistance.

Q: Explain very briefly about the flux fringing and their place of occurrences.

A: Whenever the flux is developed within the air gap of the magnetic circuit, then this phenomenon is…

Q: What characteristic is desirable in the B–H curve for a prospective material to be used in a…

A: In permanent magnet, the magnetic material in which the magnetic dipoles are already oriented in a…

Q: SOLVE AND SHOW YOUR COMPLETE SOLUTION. ANSWERS SHOULD BE IN TWO DECIMAL PLACES. The armature of a…

A:

Q: I need the complete solution.

A: Step 1: Solution(7) : **(i) Lap Fashion (Winding)**1. Determine the following formula for DC machine…

Q: A 220 V , 60 Hz , supply is connected to 200 – turn armature winding of reluctance 1.7x105 At / Wb .…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Mechanical losses represent: A. Windage losses B. None of the other choices are correct O C. Losses…

A: In this answer let us try to understand what are mechanical losses as explained below.

Q: Determine the number of branches and nodes in the circuit in Fig. 2.71. 352 2 0 5i 10 V 4Ω 3Ω 6Ω

A:

Q: What happens to the reluctance of a magnetic path if its length is doubled? If the crosssectional…

A: The formula for Reluctance is: R=lμAWhere,R=Reluctancel=Length of the magnetic pathA=Cross section…

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.