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can a 3 phase motor be run on single phase?
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Not directly. They will run on 2 connected phases but not very well. What you can do though is buy a VSD (variable speed drive) with 240V 1 phase input and 240V 3 phase output. Most smaller AC squirrel cage motors can be connected in STAR or DELTA. You connect them in Star to run them on 415V 3 phase or Delta to run them on 240V 3 phase. By smaller I mean up to about 1.5kW (2hp). You wouldn't want to go much bigger than that or you are talking more than 15A 1phase to run it. The advantage of using the VSD is it runs the motor up to speed making much less starting current and shock load to the phase it is connected to, and it allows you to vary the speed of the motor from 0Hz (stopped) up to 50Hz (full speed) or higher, but within reason as most of these motors don't like to be run continously at slower speeds unless they have the right cooling fan for VSD control.
I would only consider this if you can't change the motor though as it'll be cheaper to buy a new motor than fit a VSD.
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If we all had the same (good) taste, who would buy all the Fords? |
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If we all had the same (good) taste, who would buy all the Fords? |
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Agree with all of the above, but if this motor is required to be running in ccw direction as well as cw, it will need a control circuit to be wired into the Vsd.
Depending on the motor used, it may also require the use of a flat pack resister to dump the current.
Vsd's are able to make good use of many parameters to be programmed for control of the motor, ie; ramp up and down, (soft starting) setting maximum speed, etc.
In most cases if just converting single to 3 phase, and speed control is required in one direction only, a cheap brand inverter will suit most applications. I work and use only SEW Vsd's in my line of work, firstly - because of reliability, and secondly - I get a great deal on them in terms of cost.
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Rank: Veteran
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Guys
I've moved this across to the pub section. A good thread but I can't justify ot being in the Holden section.
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If we all had the same (good) taste, who would buy all the Fords? |
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If we all had the same (good) taste, who would buy all the Fords? |
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