Squirrel Cage Electric Motor

What's the voltage level specified in the delivered motor?Rest seems to be ok....& I dont know the ratio IA/IN in your requirement.starting by nominal full load current?

You received almost what you ordered (if the new motor is also 380V). Only LRC 620A for a motor having FLA 36A seems to be too much !

Most probably, locked rotor current 620 means 620% of full load current. The vendor proposal is 680%. It is slightly higher but can be acceptable (depends on the tolerance level). Try to get the full load efficiency, no load current, locked rotor torque from the vendor and verify it with your requirement.

And obviously, the vendor didn't mention the voltage. It is very important that it meets the order specification.

- MS

Sirs

i gave details of our specification and recieved specification

but our specification says that 3000rpm ..recieved motor says that 2940 r/min(rpm) ...is it acceptable. I calculated by rpm=120xf/p but (f=50hz,p=2) but 2940 is not comming 3000 is comming.

my motors make is bartec and model is 4KTC 180 M-2

In recieved motor given that A=34.5 but our specification says that full load current 36 and no load current is 20 but recieived motor doesnt mention about no load current

locked rotor current (%FLC) in our specification is 620 but recieved motors name plate says A= 34.5( I think this is full load current) and IA/IN=6.8 ( could not able to understand whether it is locked motor current /full load current ratio or not

SIR'S PLZ HELP ME...IS THIS MOTOR ACCEPTABLE

I WILL BE GREATFULL TO YOU

DAVID

David,

Your motor specification stating 300rpm is the synchronous speed of the motor which as you rightly said is the value you get from the formulae 120f/p. The manufacturer is giving you a 2 pole motor and thus having a synchronous speed of 3000rpm. The value of 2940 rpm stated in the manufacturer data sheet is the running speed of the motor when driving the load, i.e it takes into account the slip.

The full load current is ok. The locked rotor current is 6.8 times that of full load current whereas your spec called for 6.2 times. However for this size of motor this should be acceptable. Note that IEC and other international standards allow for a positive tolerance above the 6.2 times given by you.

The offered mtor is hence OK.

Dear sir

I am very greatfull to you for your quick reply and mentioning you thanks from my heart. MAY I HAVE YOUR NAME SIR

god bless you

thanks

david

SIR

I FORGET TO WRITE THE VOLTAGE SPECIFICATION

voltage in our specification is 380/3PH/50HZ

RECIEVED MOTOR SAYS

V HZ KW A COSPTHETA r/min IA/IN

D400 50 18.5 34.5 0.91 2940 6.8

Y690 50 18.5 19.9 0.91 2940 6.8

OUR SPECIFIFICATION MENTIONED THAT STARTING METHOD IS = DOL (DIRECT ON LINE)

BUT FREQUENCY SAYS 3000RPM but recieved motor says 2940 r/min is it ok?

thanks

david

Maybe the Guest (David?) needs a synchronous motor?

David don't forget the slip in induction motor.

Everything in the specification looks good, but it depends on application and type of loads.

Suvek Kumar