hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?

hi i wonder will the speed of a 50hz AC motor reduce if i
supply it with 25hz?

Question Posted / mihail

4 Answers
6545 Views
Divis Laboratories, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?..

Answer / syed

Currently certain motors are designed to run on variable
frequency drives. By reducing frequency the motor speed is
also decreased. These drives control motor voltage and
current proportional to the frequency so that motor torque
is maintained at that particular speed.

Is This Answer Correct ?

1 Yes

0 No

hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?..

Answer / vikas

As we know frequency is inversely proportional to time.if you run your AC motor with 50 hz frequency let consider
F=k/T
T=k/50
T=0.02k sec
and if frequency is 25hz
T=k/25
T=.04k sec
that means at 25hz it will take more time to complete one cycle.
thats why motor reduces its speed at 25HZ

Is This Answer Correct ?

0 Yes

0 No

hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?..

Answer / simon

Formula for ALTERNATOR is

Fq=P*N/120
LET P=4,N=No.R.P.M 1500

SO 4*1500/120=50Hz

2*1500/120=25Hz.

Is This Answer Correct ?

0 Yes

0 No

hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?..

Answer / 7anoter4

It works but you have to reduce also the voltage to a half.
Other way the no-load current and the iron losses will be
very large and the motor could stop or damage.

Is This Answer Correct ?

0 Yes

2 No

Post New Answer

More Electrical Engineering Interview Questions

How to calculate transformer capacity requirement for a project site?

5 Answers ABB,

A motor running with lenze frequiency inverter stops if I REDUCE SPEED with 25% load.If I run it in High speed and medium speed running smoothly with full load.please help me to solve it.

0 Answers

Why all voltage level are multiples of 11, like 220V, 440V, 1100V instead of 200V, 400V, 1000V?

9 Answers Indian School of Mines,

what happens when a power transformer neutral earthing broken???

11 Answers MacLellan,

what is the roll of power factor in induction motor.

3 Answers Hindalco,

What is the method to solve circuit using source transformation?

0 Answers

what is PPI DB?

2 Answers Priyanka Electricals,

Please give me a ansver for why currant transforme noe point should erthing

1 Answers

We are designer please help me calculate the size of 11kv cables from step up transformer to M.V panel, total load is 5 mega watt distance 900 feet (used aluminum type cables) please provided formula for calculate the cable with example.

0 Answers SK Engineering,

what is means of ALF,kPV(min),lexc(max)at Vk,Rct@75 degree centrigate ohm in current transformer name plate?

2 Answers

difference between synchronous reluctance motor and switched reluctance motor

1 Answers

BRIEFLY EXPLAIN THE STORAGE CLASSES AND THEIR TYPES IN C

0 Answers

For more Electrical Engineering Interview Questions Click Here