2mJps
Well-known member
Is their a electric motor that can run on 3ph and single ph ? I was told their was but dont think so.
True or false
- Thread starter 2mJps
- Start date
The motor itself? None that I'm aware of.
However, many motor drives can operate a 3-phase motor on 3-phase or 1-phase input power.
zmaxmotorsports
Well-known member
Not that I know of motor wise,but theres been times in the past where we just used 2 of the 3 wires on a 3 phase disconect to run single phase 240v equipment.
Single phase 240v welders run really good off 277.
Single phase 240v welders run really good off 277.
rlitman
Well-known member
They will run, but will run very hot. Running a 3 phase motor on less than 3 phases will eventually ruin the motor.
1/2 Cup
Member Emeritus
Not that i am aware of.
wyliesdiesels
Well-known member
Theres no 3 phase motors that will run on single phase WITHOUT shortening its life! Sure it will work for a little while if the overloads dont trip..
http://www.usmotors.com/TechDocs/ProFacts/5Cases-Run-1Phase.aspx
http://www.usmotors.com/TechDocs/ProFacts/5Cases-Run-1Phase.aspx
nehog
Well-known member
theoldwizard1
Well-known member
Sure, any single phase motor will run on three phase (using two of the three lines!)
With about 1/3 the power !
Rookie2
Well-known member
Don't know. why would you want one? sounds like a military $600.00 toilet seat.
Gary S
Well-known member
Every time I've had a 3 phase motor lose a phase while running, it dropped the breaker in a few seconds to protect it. If it is properly protected, the fuses or breaker will prevent the motor from burning up.
Speedy Petey
Well-known member
No. Using two of the three 3-phase lines is single phase.
That's what he meant.
gregtwojeeps
Well-known member
False, that is why its called "single phasing" and will eventually cook the 3 ph. motor if the thermals do not trip out on the starter. I put 3 phase monitor relays on all my 10 HP + 3 ph. motor control circuits just to protect them from single phasing.
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210Hardtop
Well-known member
This is what you don't want to happen with a 3 phase motor.
It will burn out one of the windings in the motor
Don't tell all the home hobbiest running industrial machines successfully on static converters. The key is to run at a reduced load. When in the plant running 3 phase at near FLA and losing a phase =trouble.
lg
no neat sig line
wyliesdiesels
Well-known member
Yup because the overloads/thermals were set/sized correctly. Ive had to replace motors that burnt up because the overloads were set too high and didnt trip when the motor lost a phase in the feeder!
zmaxmotorsports
Well-known member
Are you sure it wasnt a diagragm for high voltage or low voltage 3 phase?
Lots of motors have that on the name plate.
wyliesdiesels
Well-known member
Is the pump single phase or 3 phase? If the pump is single phase and the service is 3 phase then that will work fine! But vice versa WILL NOT(3 phase pump on single phase service!)
Doug Arthurs
Well-known member
You could use a vfd at reduced output but it will be way cheaper to get the right motor.
I don't know if the technology is being used in hydraulics but it is being used in water well pumps. http://www.aquascience.net/goulds-propak/ Well pumps that are touted in the link as constant pressure pumps are in reality a VFD that controls the speed of a 3 phase pump. It could be used in hydraulics as well but I have never seen it.
As an aside I have one of constant pressure pumps and I like it. One of the unforeseen advantages is that it is perty easy to run the pump on a generator as it has no inrush start-up current spike and will run at a couple of amps if only using low flows like the water taps in the house.
lg
no neat sig line
wyliesdiesels
Well-known member
^+1. Yup, Ive installed many water pumps with VFDs, on both 3 phase and single phase service. I dont see why a hydraulic pump couldnt be run off of a VFD as well...