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
5119 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

If the field winding of the dc shunt motor is removed then what will happen to the motor ? will it turn or not

2 Answers

a 25kvar capacitor bank connected to the secondary side of transformer.then why the capacitor draws more current then rated

3 Answers TATA,

CAN A CD/CLOCK RADIO WITH 110V 60HZ WORK ON A 110V 50HZ FEED.

3 Answers

Why Two Transformers aside shoud be supperated by concreted wall?

5 Answers

what happens when ac supply is given to the dc motor and dc supply is given to the ac motor?

1 Answers GATE,

do you know measure the earth resistance?explain

1 Answers Dalkia,

What is the difference between Ac curent & DC current

2 Answers Juniper Networks,

What is the maximum load an electric engine can pull??

3 Answers Oil India,

How to improve fuel cell in a distribution system?

0 Answers

I have cleared IOCL written exam(Electrical). My intv is on 6/9/2008.can anyone guide me & tellme abt intv questions.

5 Answers IOCL,

What is the method for testing the differential protection stabilty in generator? When the time of starting What will happen if differentail protection connection wrong means?

0 Answers JSW,

What is required of exietation to the alternater.

3 Answers

For more Electrical Engineering Interview Questions Click Here