Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Rotary Converter shopping experience:
1. Compare - without doubt the biggest advantage that the Rotary Converter offers shoppers today is the ability to compare thousands of Rotary Converter at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Rotary Converter? Wrong! If the Rotary Converter is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Rotary Converter then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Rotary Converter? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Rotary Converter and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Rotary Converter wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Rotary Converter then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Rotary Converter site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Rotary Converter, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Rotary Converter, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
Rotary converter refers to a class of electrical machinery that was used to convert one form of electric power into another form. There are several types of "rotary converter". They are:
- Rotary Phase Converter (RPC) - for converting the phase of electrical power; such as single phase to three phase power. See Rotary phase converter.
- Rotary Frequency Converter - for converting the frequency of an AC supply; e.g. converting 60Hz (US household frequency) to 50Hz (UK household frequency). See Frequency converter.
- Rotary AC to DC Converter - for converting Alternating current to Direct current power or DC to AC. See below.
A typical use for an AC/DC Converter was for Railway electrification system, where utility power was supplied as alternating current (Alternating current) but the trains were designed to work on direct current (Direct current). before the invention of
mercury arc rectifiers and high-power semiconductor rectifiers, this conversion could only be accomplished using motor-generator or rotary converters.
This technique was also used for providing DC voltages to radio transmitters and to
telephone exchanges before 1935.
The rotary converter can be thought of as a motor-generator where the two machines share a single rotating
armature (electrical engineering) and set of
field coils. The usual practice, in fact, was to have two Commutator (electric)s, one at each end of the armature (or, for AC-to-DC machines, a set of
slip rings and a commutator). The advantage of the rotary converter over the discrete motor-generator set is that the rotary converter avoids converting all of the power flow into mechanical energy and then back into electrical energy; some of the electrical energy instead flows directly from input to output, allowing the rotary converter to be much smaller and lighter than a motor-generator set of an equivalent power-handling capability. The advantages of a motor-generator set include complete power isolation, harmonics isolation, voltage output control, greater surge and transient protection, and sag (brownout) protection through increased momentum.
(One way to envision what is happening in an AC-to-DC rotary converter is to imagine a rotary reversing switch that is being driven at a speed that is synchronous with the power line. Such a switch could Rectifier the AC input waveform with no magnetic components at all save those driving the switch! The rotary converter is somewhat more complex than this trivial case because it delivers near-DC rather than the pulsating DC that would result from just the reversing switch, but the analogy may be helpful in understanding how the rotary converter avoids transforming all of the energy from electrical to mechanical and back to electrical.)
AC to DC Rotary converters have essentially been made obsolete by smaller, cheaper, far more reliable
semiconductor rectifiers. For railway electrification via a catenary wire there has also been a tendency to switch from medium-voltage DC or low-frequency AC to high-voltage, mains-frequency AC, thus eliminating the need for any rectification or frequency conversion.
Rotary converters were in earlier days also used for producing radio frequency. Therefore different systems were developed. However this worked unsatisfactorily. The only workable rotary converter for radio frequency today is that of Grimeton VLF transmitter.
See also
- Cascade converter
- Motor-generator
- Rotary phase converter
- Frequency converter
- Three-phase
External links
- An article about AC-to-DC rotary converters used for traction power
Rotary converter refers to a class of electrical machinery that was used to convert one form of electric power into another form. There are several types of "rotary converter". They are:
- Rotary Phase Converter (RPC) - for converting the phase of electrical power; such as single phase to three phase power. See Rotary phase converter.
- Rotary Frequency Converter - for converting the frequency of an AC supply; e.g. converting 60Hz (US household frequency) to 50Hz (UK household frequency). See Frequency converter.
- Rotary AC to DC Converter - for converting Alternating current to Direct current power or DC to AC. See below.
A typical use for an AC/DC Converter was for Railway electrification system, where utility power was supplied as alternating current (Alternating current) but the trains were designed to work on direct current (
Direct current). before the invention of
mercury arc rectifiers and high-power semiconductor
rectifiers, this conversion could only be accomplished using motor-generator or rotary converters.
This technique was also used for providing DC voltages to radio transmitters and to
telephone exchanges before 1935.
The rotary converter can be thought of as a motor-generator where the two machines share a single rotating
armature (electrical engineering) and set of
field coils. The usual practice, in fact, was to have two
Commutator (electric)s, one at each end of the armature (or, for AC-to-DC machines, a set of slip rings and a commutator). The advantage of the rotary converter over the discrete motor-generator set is that the rotary converter avoids converting all of the power flow into mechanical energy and then back into electrical energy; some of the electrical energy instead flows directly from input to output, allowing the rotary converter to be much smaller and lighter than a motor-generator set of an equivalent power-handling capability. The advantages of a motor-generator set include complete power isolation, harmonics isolation, voltage output control, greater surge and transient protection, and sag (brownout) protection through increased momentum.
(One way to envision what is happening in an AC-to-DC rotary converter is to imagine a rotary reversing switch that is being driven at a speed that is synchronous with the power line. Such a switch could
Rectifier the AC input waveform with no magnetic components at all save those driving the switch! The rotary converter is somewhat more complex than this trivial case because it delivers near-DC rather than the pulsating DC that would result from just the reversing switch, but the analogy may be helpful in understanding how the rotary converter avoids transforming all of the energy from electrical to mechanical and back to electrical.)
AC to DC Rotary converters have essentially been made obsolete by smaller, cheaper, far more reliable
semiconductor rectifiers. For railway electrification via a catenary wire there has also been a tendency to switch from medium-voltage DC or low-frequency AC to high-voltage, mains-frequency AC, thus eliminating the need for any rectification or frequency conversion.
Rotary converters were in earlier days also used for producing
radio frequency. Therefore different systems were developed. However this worked unsatisfactorily. The only workable rotary converter for radio frequency today is that of Grimeton VLF transmitter.
See also
- Cascade converter
- Motor-generator
- Rotary phase converter
- Frequency converter
- Three-phase
External links
- An article about AC-to-DC rotary converters used for traction power
Rotary converter - Wikipedia, the free encyclopedia
A rotary converter is a type of electrical machine used to convert one form of electrical power into another form. There are several types: Rotary Phase Converter (RPC) - for ...
Rotary phase converter - Wikipedia, the free encyclopedia
edit] Definition. A rotary phase converter, abbreviated RPC, is a Rotary converter that produces Three-phase electric power from Single-phase electric power.
Rotary Phase Converter Information Page - Phase-A-Matic, Inc.
Runs 3-Phase Equipment at FULL Power from Single-Phase Power Lines. 220V and 460V models available. For 60Hz and 50Hz use.
Phase-A-Matic, Inc. Rotary Phase Converter Models & Prices
220V MODELS HP RATING SEE NOTE BELOW PRICE SHIPPING WEIGHT SHIPPING DIMENSIONS (Shown In Inches) R-1: 1 $432.00. 33 lbs. 15x10x10: R-2: 2 $524.00: 41 lbs. 15x10x10
rotary converter - definition of rotary converter by the Free Online ...
Noun: 1. rotary converter - electrical converter consisting of a synchronous machine that converts alternating to direct current or vice versa
Rotary Converters Techincal Information - The Engineers Emporium
The Rotary Converter provides an artificial means by which a three-phase motor can be operated from a single-phase supply thereby offering a cost-effective solution to this ...
Rotary phase converters, rotary phase conversion
3 phase converters; rotary phase converters (mis-spelt three phase convertors or misnamed 3 phase transformers) provide single to 3 phase conversion.
Choosing the right size TEMCo Rotary Phase Converter for your three ...
Superior Rotary Phase Converters Choosing the right size TEMCo Rotary Phase Converter TEMCo's Superior Rotary Phase Converters produce clean, quality 3-phase power ...
Phase Converter Info & Sales, rotary phase converters, static phase ...
Phase converter sales - TEMCo: Tower Electric Motor Company -- New single to 3-phase heavy duty static phase converter & rotary phase converters. TEMCo has experience ...
Applications
A rotary converter will overcome this problem. e.g. a Colchester Student lathe is driven by a 3hp 1400rpm motor and has a top mechanical speed of 1200rpm, however ...
