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Single phase converters
4

Single phase converters

Single phase converters

(OP)
Has anyone ever found any information about how a single phase converter works.  I am looking for the technical info behind it.  If there is a website or book that someone knows of that would be great

thanks
chris

RE: Single phase converters

You can consult for example             
Power Electronics : Circuits, Devices and Applications (3rd Edition) by Muhammad H. Rashid

RE: Single phase converters


On the North American continent, “phase converters” seem to have a cottage-industry foundation.  There are an assortment products that are marketed for various semi-niche ‘mom & pop’ applications, like very rural broadcast transmitters, CNC mills and laser interferometers.

Their viability seems to be indirectly based on various electric utilities’ line-extension rules and fees.

Mindful that they are a hawking their wares, you can find bits and pieces at sites like:
www.gwm4-3phase.com/uands_index.htm
http://home.earthlink.net/~ojmsmith/indexd.html
http://www.capacitorconvertors.com/staticinstructions.pdf
[There are also FAQ-like articles linked in usenet metalworking and woodworking newsgroups.]

Many smaller VFDs have the capability of 1ø input, 3ø output that function as phase converters with additional control functions [and limitations.]

See also Thread237-91110  Note that recent NEC editions have a dedicated article—455.
  

RE: Single phase converters

Comment on the original posting: There are various single phase converters, namely:
1. Single phase to three phase. These are essentially AC-DC-AC converters similar to 3phase AC-DC-AC converters except the AC-DC conversion (rectification) is single phase instead of three phase. The hardware for single phase to dc conversion is simpler than three-phase to dc conversion (rectification).
2. Another type of single phase converters are single phase converters, AC-DC-AC for single phase loads, e.g. single phase motor variable speed drives.
3. Another single phase converter AC-DC-AC is a frequency converter, e.g. 50Hz to 60Hz, 60Hz to 400Hz, etc.

To narrow down the topic, it would be nice if the original posting was elaborated on to become more specific.

RE: Single phase converters

(OP)
To reply to Jbartos, The information that I am looking for is the theory behind a single phase to 3-phase converter.  Namely a static converter that converts the single phase power to run a 3-phase piece of equipment.  Looking and searching on the internet, I have seen some schematics where they use a capacitor between one of the hot legs and the neutral (70-100uf/hp) and using this setup are able to make 3-phase power.  I am trying to find out the theoretical explanation behind this.  Any information as to books or sites would be very helpful.  

thanks

RE: Single phase converters

Comment: The capacitors can displace voltage at one terminal such that the three phase resembling power supply can be formed. However, there are some limitation on the motor loading. Visit
http://www.phase-a-matic.com/StaticDescription.htm
etc. If this is acceptable, the further engineering and design may be pursued.
Reference:
M.G. Say "Alternating Current Machines," John Wiley & Sons, 1978
Single to three phase conversion.
Also, there are some postings in this Forum on this topic. E.g. search for:
Running a 3-phase induction motor on single phase

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