one phase or 3 phase motor?
one phase or 3 phase motor?
(OP)
Dear experts
I am building a machine that will make 1 kg wire coils from 25 kg large coils (recoiler)
The motor will be 1HP and it will start and stop every 30 seconds. My question is: Should I use a one phase motor or a 3 phase motor? Witch are the chosing factors?
I am building a machine that will make 1 kg wire coils from 25 kg large coils (recoiler)
The motor will be 1HP and it will start and stop every 30 seconds. My question is: Should I use a one phase motor or a 3 phase motor? Witch are the chosing factors?





RE: one phase or 3 phase motor?
RE: one phase or 3 phase motor?
A 30 second duty cycle is harsh on either a single phase motor or a three phase motor. The VFD will start the motor with much less heating and in addition you will have programmable acceleration and de-celleration ramps. You will also have the advantage of speed control.
If you don't want to use a VFD I would suggest a three phase motor. Less moving parts and often better starting torque. The better starting torque means faster acceleration which may mean less motor heating during starting.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: one phase or 3 phase motor?
But I'll also chime in with Bill, go 3 phase if you are not going to use a VFD. 1 phase means you have starting switches and capacitors that will get very stressed from the duty cycle and will be a primary point of failure earlier than anything in a 3 phase motor.
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RE: one phase or 3 phase motor?
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Column A is starts per hour. The highest number anywhere on the chart is 34 starts per hour (one per two minutes)
I tend to think when you start crowing the starts too close together the failure can be short-term rather than long term when you reach the melting temperature of aluminum.
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(2B)+(2B)' ?
RE: one phase or 3 phase motor?
Keith Cress
kcress - http://www.flaminsystems.com
RE: one phase or 3 phase motor?
Use an electric clutch so I dont have to stop the motor every time the coiler finish to wind. The start and stop will be done with the clutch and the motor keeps running
what do you think?
RE: one phase or 3 phase motor?
Note: Small (1 hp) VFDs are available that are capable of running on a supply current that is either single phase or three phase.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: one phase or 3 phase motor?
RE: one phase or 3 phase motor?
If you were to go all the way to a sensorless-vector or servo drive and use very aggressive acceleration and deceleration settings, the high current during the ramp up and ramp down might have to be analyzed, but even in this case, a couple of seconds of high current out of a 30-second cycle would probably not be problematic.
Curt Wilson
Delta Tau Data Systems
RE: one phase or 3 phase motor?
RE: one phase or 3 phase motor?
RE: one phase or 3 phase motor?
The main difference is that the cooling doesn't depend upon a shaft-driven fan. The motor cools as much standing still as running full speed.
Watch for it!
RE: one phase or 3 phase motor?
DickDV knows what he speaks of...consider what he says.
RE: one phase or 3 phase motor?
We will do some tests with our existing motor because we already have it and we dont use it for anything else and I am getting in touch with a TENV motor seller too.
It will take some time before we have the TENV motor in our factory
Thanks to all for your help. I will comeback with news after the first tests are completed
RE: one phase or 3 phase motor?
RE: one phase or 3 phase motor?