Why synchronous motor runs at a fixed speed?
what is the name of that fixed speed?
- 4 Answers
- 14970 Views
- I also Faced
- E-Mail Answers
Answer Posted / guest
Synchronous motor runs on the principle of MAGNETIC LOCKING
between two fields.
1)Armature field:Produced when a 3 phase balanced supply is
given to 3 phase balanced armature winding at stator.
Armature field rotates at synchronous speed.The direction
of rotation is given by the phase sequence of 3 phase
supply.
2)DC field:Rotor is brought up to synchronous speed by
external means in the same direction as that of rotation of
armature field. At the instant of MAGNETIC LOCKING(when the
speed of armature field and the speed of rotor are equal)
DC supply is given to DC field winding at rotor.
Motor runs at fixed speed which is called SYNCHRONOUS SPEED
as long the locking is there.
Author:arbelectbit@yahoo.com
| Is This Answer Correct ? | 12 Yes | 5 No |
Post New Answer View All Answers
what is the criterion for selecting vector group of Transformers ? i mean how to decide vector group of Generator transformer, substation trasformer and transformer at consumer end
what is the purpose that we use PLC system in power system
How many types of faults are there in 3 phase power system?
11kv/433v delta/star distribution transformer primary side full load Ht current is 83.33A in , but input side VCB rating 800A.why?
what are the basic insulation levels & what its Unit
I have an existing old MCCB. ABB Model SACE, the rating are: Ue = 660 volts, Iu =1250 Amps, 3 poles, Ith (max) =800 amps at 45 deg C. I need a circuit breaker for my 3 phase motors, 380 volts 60 hz. the supplier required the minimum ampacity of the breaker to be 911 amps. can i use this breaker with rating of Iu =1250 amps but Ith = 800amps maximum?
PLZ sent the previous year question paper for GET in NHPC on my EMail id ppshanker@gmail.com
WHY RATING OF VCB NOT LESS THAN 630A
how to test YNyn0 vector group in transformer?
what is the role of transistor in Circuit?
dear sir/madam i want to get some knowledge about RRB EXAMINATION(section engineer) 1- what is minimum cut off 2- wht portion is major portion . 3- can any body provide Sample paper. thanks & regards ashish
what is the series parallel connection of capacitors? and how can we use these application in three phase motors for controlling torque?
what is the difference between 2 way and 4 pole selector switch???
Anybody know how schematic diagram for reverse power relay? RPR for generator protection
What is the tipical Online UPS input voltage for 20 KVA load ( 3 Phase or 1 Phase )? Why ? Explain it...?
