Can we somehow vary the frequency of an Alternating current?
2007-07-17 02:00:37 · 8 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
the frequency of alternating current depends on the speed of the alternator/generator at the power production station.
In india, its usually 220 Volts at 50 Hz.
In USA, it is 440 Volts at 60 Hz.
So the variation depends on the speed of the alternator at the time of generation and how the phase changes on the wave.
Hence, its possible to change the frequency of AC.
2007-07-17 02:07:03 · answer #1 · answered by Encyclopedia 4 · 1⤊ 0⤋
I don't believe that higher frequency AC is any "safer" then 50-60 HZ frequency. The problem with 60Hz frequency is that It is very close to the frequency at which your heart beats. That by itself can cause your heart to stop when you are electrocuted. If anything the high frequency is more dangerous because the voltage is going to peak a lot faster at a high frequency then it will at a low. Also your house appliances will only work on 60Hz. If your plugged your hair dryer into a 20khz outlet it would immediately blow up. Im still learning though so if i am wrong anyone feel free to correct me.
2016-05-20 00:40:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
If the AC is supplied by your generator, you can change its operating speed.
If you can't change the speed of the generator, you can use a frequency changer. There are two types. The mechanical type is essentially a motor driving a generator through a pulley or gear ratio that changes the speed. The electronic type consists of a rectifier circuit that changes the AC to DC and an inverter circuit that uses switching circuits to make a stepped waveform AC of a different frequency. A filter circuit may be used to improve the waveform. A cycloconverter is another circuit that uses electronic switches to change the AC waveform to a waveform of another frequency without first rectifying it.
To change frequency to control the speed of a motor, use a variable frequency drive (also known as VFD, AC drive). A VFD contains rectifier and inverter circuits plus circuitry to protect the motor, control acceleration, limit current and perform other functions.
2007-07-17 03:08:34 · answer #3 · answered by EE68PE 6 · 1⤊ 0⤋
There are convertors, which are basically electric motors and generators in one. The input AC current (or DC, in which case the device is called an alternator) runs a motor, which is connected to an AC generator. By controlling the speed at which the motor turns, you can control frequency of the AC output.
2007-07-17 02:07:53 · answer #4 · answered by dansinger61 6 · 0⤊ 0⤋
Yes, change the rotation of the generator RPM. The frequency of the AC is proportional to the speed of the power generating machine and the number of poles of the said machine.
2007-07-17 02:21:41 · answer #5 · answered by dongskie mcmelenccx 3 · 0⤊ 0⤋
Why on earth would you want to do that? You want a 50Hz machine to run on 60Hz or the other way round? Most equipment works fine on either. Things with motors in are less likely to be happy.
The power losses in a converter would make it not worthwhile. It's better to replace the machinery with one that runs on the right frequency.
Oh, and since when was the USA 440V!!!
2007-07-17 02:07:08 · answer #6 · answered by Anonymous · 1⤊ 1⤋
Yes, pass he current through a full wave rectifier and it will change its wave form from full to half.
2007-07-17 02:08:24 · answer #7 · answered by Sane 6 · 0⤊ 0⤋
yes, but then your clock will not have the proper time.
2007-07-17 10:18:04 · answer #8 · answered by lare 7 · 0⤊ 0⤋