Answer Posted / sath
DC machines can be classified as self-excited, separately
excited, permanent magnet (PM), and brushless.
AC machines can be classified as induction, wound rotor,
and synchronous.
Self-excited machines can be further classified as shunt,
series, and compound. Compound machines can be further
classified as cumulative and differential. Cumulative and
differential machines can be further classified as long
shunt and short shunt. As you can see, there are a variety
of electrical configurations for a DC machine.
Induction motors can be further classified as 3-phase and
single-phase. A 3-phase induction motor can be further
classified as delta wound or wye wound. Single-phase
motors can be further classified as split phase (Fig. 3),
capacitor start, capacitor start/capacitor run, shaded
pole, repulsion start, and universal. As you can see, there
are several varieties of AC motors.
Common terms you will hear discussed with DC motors include
commutator, brushes, counter electromotive force (EMF),
torque, speed regulation, and speed-torque characteristic
curves.
Common terms you will hear discussed with AC motors include
frequency, synchronous speed, and slip.
In d.c. motor speed is depended on field strength of the
machine.
In a.c. motor speed is depended on frequency of the machine.
In d.c. motor torque is depended on armature current and
field flex.
In a.c. motor torque is depended on slip.
| Is This Answer Correct ? | 29 Yes | 3 No |
Post New Answer View All Answers
how many types control panel of a 132/33 kv substation
How to Calculate KA Rating of Main LT Panel
why Induction Generators are not "Black start" ? and apart from WTGs where this types of generator are generally used?
Why MCCB is Getting tripped sometimes when there is no load in the Midnight ?
I have two PLC processors. I want to communicate both processor with each other. How i can do so?
Hello Guys !! i want to rrb section engineer electrical(signal) previous model papers? any body help me?
how to make an earthing certificate
Can the output voltage of a rectifier be greater than the input AC voltage without the use of any voltage multiplier in the circuit??please provide the explanation too..
advantage of motor design on higher power factor . normally motors are designed for .8 power factor. what is advantage of designing at .88 power factor
i am completed diploma in ece,and working in ht and lt lines.so is elligible diploma in ece for get electrical C Licence?plse give ur opinion?
how to check avr of dg set of 125kva
What is power factor why we should maintain the power factor unless what will happen
Why use the vcb at high transmission system ? Why can’t use acb?
why -48 volts dc used in telecommucation
from which subjects most of the technical que will b asked for hpcl(electrical).pls help me
