Between rotating armature type and rotating field type
arrangements which one is adopted for large rated
alternators and DC generators.Why there is difference in
the choice?
Answer Posted / iamdon
Large rated alternators are of rotating field type where as
DC genertors are of rotating armature type.The basic reason
behind different choice of arrangements is governed by
following factors.
INSULATION in the case of alternator and
COMMUTATION in the case of DC generator.
In the case of large alternators, more insulation is
required for large voltage generated in armature
winding.Being armature placed on stator,it is easier to
provide insulation for the stationary armature winding.Also
armature is placed on radially outer side, so we can put
more and more insulation(if required for higher voltage)in
the space avaliable.
In the case of DC generators,AC is generated in the
armature winding which is converted into DC, by means of
mechanical rectifier i.e, commutator.It is convenient to
adopt rotating commutator and fixed brush ararrangement for
collecting DC through brushes.So we need to place armature
winding on the rotor.
Author:arbelectbit@yahoo.com
Is This Answer Correct ? | 10 Yes | 2 No |
Post New Answer View All Answers
What happens if i apply 500V to 440V rotary Switch ?
The advantages of Magnetic flux leakage technique over Ultrasonic technique for non distructive testing of material.
if a number of plc s are there then how many modbus to be used
what is the use of permanent magnet generator in exciter
A 15 kw squirrel cage motor having a maximum efficiency of 90% on a continuous full load has temperature rise of 42 degrees celcius after 30 min and 52 degrees celcius after 1 hr under the above operation conditions. a) calculate its final steady state temperature rise on continuous load and the heating time constatnt. b) if the motor is operated on a short load for 9 min estimate its temperature rise. c) calculate the maximum overload that can be applied on a short, 9 min rating so that the temperature rise is the same as the final steady state temperature rise on continuous load.
What is the safety of UPS?
how can service sitting be setted for MCCB?Example for sittings IR (CURRENT RATING),IS(CURRENT STARTING)IO (current operating)?
explain the functions of main isolation switches
Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices
how will we calculate the copper wire load..
how a resistor resists to flow the current?how an inductor oppses the sudden change in current?how a capacitor opposes a DC voltage.
Explain what is electric traction?
what will happen if there is a voltage leakage or current leakage in an electrical train
what r the checklist while installing a 380 kva DG set
Define closed loop control system.