- Thread starter excossack
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shenion
Tool Pack Rat
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- 7,586
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- Stone Mountain, GA USA
Drains
Yeah, nah.
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Excossack, I think Wozz's explanation is the one for the motor you were looking at, eg, it only had 3 connections to the power line, the other three were internal. Could be wrong though as you had the star/delta sign there... Many motors will run star delta - one for starting, one for running. Also, many 3ph motors will run on 415 or 240v. You need a sparky or electrical engineer to explain how all this works, cos I don't know!
More stuff to confuse here too - note, the "IEC" nomenclature (U,V,W), is usually used in motors, L1,L2,L3 relates to the leads in.
More stuff to confuse here too - note, the "IEC" nomenclature (U,V,W), is usually used in motors, L1,L2,L3 relates to the leads in.
Hello Shenion,
"Here, motors usually have 12 wires/terminals"
That's not usual for a three phase motor. Do you commonly have different voltages or two speed motors where you are? In it's basic form a motor has three windings and six tails?
Drains, the simple reason as to why changing from Star to Delta works is that in star the windings are in series across the phases which means that each winding shares 415v (to the ratio of 1.732), i.e 240v each and in delta each winding is fed from two phases so has 415 volts across each winding. This gives more current per winding and more power. That is why star is used to start, less of a power surge and delta for full power.
If you have a dual voltage motor, basically one that is designed for 240v phase to phase, then it will run at full power in star when fed from 415v 3phase and also will run on full power when fed from 240v 3 phase connected in delta, as is often found with single to three phase inverters.
Alec
"Here, motors usually have 12 wires/terminals"
That's not usual for a three phase motor. Do you commonly have different voltages or two speed motors where you are? In it's basic form a motor has three windings and six tails?
Drains, the simple reason as to why changing from Star to Delta works is that in star the windings are in series across the phases which means that each winding shares 415v (to the ratio of 1.732), i.e 240v each and in delta each winding is fed from two phases so has 415 volts across each winding. This gives more current per winding and more power. That is why star is used to start, less of a power surge and delta for full power.
If you have a dual voltage motor, basically one that is designed for 240v phase to phase, then it will run at full power in star when fed from 415v 3phase and also will run on full power when fed from 240v 3 phase connected in delta, as is often found with single to three phase inverters.
Alec
shenion
Tool Pack Rat
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- 7,586
- Location
- Stone Mountain, GA USA
Here most motors have 6 windings, each 120 to 170V. Basically, each winding is split into two halves.
pairs in parallel then wired wye gives 208-240V. pairs in series and wye gives 400-430V. It can also be wired with pairs in series then delta for 220-280V.
Here, 3-phase comes in 208, 220, 380, 440, 480, 575V options. So, motors come setup for multiple voltages.
pairs in parallel then wired wye gives 208-240V. pairs in series and wye gives 400-430V. It can also be wired with pairs in series then delta for 220-280V.
Here, 3-phase comes in 208, 220, 380, 440, 480, 575V options. So, motors come setup for multiple voltages.
