Calculating Frequency for Induction Motors with Given Horsepower and Pole Count

AI Thread Summary
To calculate the frequency for an induction motor with 10 horsepower and four poles, the synchronous speed (ns) can be determined using the formula ns = 120 * frequency / number of poles. The rated speed of the motor is typically within 5% of the synchronous speed. The formula for induced torque is given as Pgap / Ws, where Ws requires the frequency for calculation. In engineering, answers that are within 10% of the expected value are generally considered acceptable. Understanding these principles is crucial for accurate motor performance analysis.
onceinalifetim
Messages
38
Reaction score
0
Hello

I'm doing a question in induction motor now.

formula for Induced torque is Pgap / Ws.

i have found the Pgap, but in order to find Ws, i need frequency to find ns..
so my question is, how to find frequency with only given 10hp and four pole
 
Engineering news on Phys.org
The rated speed of an induction motor is typically within 5% of that motor's synchronous speed. http://www.engineeringtoolbox.com/speed-electrical-motors-d_738.html

Broadly speaking, in engineering, an answer correct to within 10% is generally acceptable. There are always exceptions to rules of thumb, but I can't see the question under discusion being one of them. :smile:
 

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Following up on the recent thread about Earth Resistance measurements'

I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
View full post »

Thread 'Question about bonding ground and neutral'

I am not an electrical engineering student, but a lowly apprentice electrician. I learn both on the job and also take classes for my apprenticeship. I recently wired my first transformer and I understand that the neutral and ground are bonded together in the transformer or in the service. What I don't understand is, if the neutral is a current carrying conductor, which is then bonded to the ground conductor, why does current only flow back to its source and not on the ground path...
View full post »

Similar threads

Increasing induction motor frequency
Replies
9
Views
3K
Induction motor windings, number of turns per phase and per pole
Replies
2
Views
4K
What is the correct method for counting poles in a 3-phase induction motor?
Replies
4
Views
3K
Calculating inductance -- Mystery units?
Replies
3
Views
1K
Building a three phase motor -- figuring out how many poles
Replies
22
Views
5K
Starting Torque of Synchronous Motors
Replies
6
Views
2K
How Can I Determine the Number of Poles in a Burnt AC Induction Motor?
Replies
2
Views
2K
How to design a single phase induction motor
Replies
3
Views
5K
Design choices for running an Electric train (and network)?
Replies
6
Views
2K
Why is impedance given as a simple Ohms unit when it's frequency dependent?
Replies
10
Views
2K

Hot Threads

Recent Insights

Back
Top