1. You are an electrician on the job. It is decided that the speed of a large DC motor is to be reduced by connecting a resistor in series with its armature. The DC voltage applied to the motor is 250 V, and the motor has a full-load armature current of 50 Your job is to reduce the armature current to 40 A at full load by connecting resistor in series with the armature. What value of what is the power rating of the resistor? the should be used, resistance and

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A: Given: Current, IL=100A, Resistance, Ra=0.04ΩRsh=115ΩRse=0.01Ω Voltage, V=230V

Q: A series motor runs at 700 rev/min when the voltage is 300 V and the current is 20 A. The armature…

A: Initial speed of motor N1=700 rpm. Initial terminal voltage V1=300 V. Armature current Ia=20 A.…

Q: Ashunt-wound DC motor with the feld coils and rotor connected in parallel (Figure 1) operates from a…

A: From the DC shunt motor equivalent circuit

Q: . In a dc shunt motor, the shunt field resistance is 100 ohms and the armature resistance is 0.01…

A: The speed of the DC shunt motor is inversely proportional  to flux. The flux is  directly…

Q: A 220 V separately excited dc motor takes 20 A and the armature resistance is 1.0 0. If the armature…

A: We need to find out the speed for given motor.

Q: Q2- What is the Working Principle of DC Servo Motor

A: The  precise control of motor in terms of position of angle of the rotor, acceleration and velocity…

Q: If the armature current in a dc machine is 400A, what should be the current in each winding if the…

A: Note In Lap winding,  Number of pole (P) = Number of Parallel path (A) In Wave winding, Number of…

Q: A shunt motor on a 240- V line has an armature current of 75 A. If the field- circuit resistance is…

A: Given data, Terminal voltage V = 240 V. Armature current Ia=75 A. Field circuit resistance Rsh=100…

Q: de motors

A:

Q: A long compound DC generator feeding a load of current 100 A, at a voltage of 230 V. Calculate the…

A:

Q: A 1.5 hp Permanent magnet motor generates a voltage of 90 V when the motor runs at 2900 r/mine and…

A: The electrical energy employed as a DC motor's input source, direct current, is transformed into…

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.