Hunan:
Most all induction motors may be operated as generators.
The alternative Energy industry ( small hidro electric plants ) mayuse the indution motors as generator.
For a single phase you drive the motor above its rpm+slip and connect running capacitors to the phase winidng, the power...
Thanks a lot for the replies
OPERAHOUSE:
A car alternator is not an alternative, it has slip rings, but if you know of the one without slip rings that are PMG ( Permanent Magnet Generator) please send the info.
Janderson:
Please explain your message and why it is a large motor,
I have used...
HUNJAN:
Any induciton motor can be converted to a generator without any mechanical changes.
There are two or more methods:
One you drive a motor above its rated RPM plus the Slip % of it, then you apply power to one/three phase(s).
The motor will produce the energy into the biasing power.
So...
The bearings will last less.
You did not say the the hydro was loaded or not.
Make sure that the oiling is properly working.
What type of turbine you have a Banki ?.
Regards
Nando
Mwolf:
Since you are not specific about your circuit it is difficult to say yes or not.
If you are connecting the resistor between the gate and the anode of the Triac then you do not have problem.
You are feeding the necessary current to turn the Triac on, that maybe in the range of about 20 or...
Jcorb5:
The Joules available is = L * I^2 = 22 H * .28^2 = 1.728 joules per pulse.
Having 125 volts at 0.28 amps a 1N4004 will do the job and is just one amp diode, since it will take 30 amps for 8 milliseconds.
A diode 200 volts, 1 amp should be suficient
You may have another problem, since...
Wobulator:
7812 need an output electrolytic capacitor as well that an input filtering capacitor.
The relay kick back, needs to be eliminated, place a diode ( IN4002) from the output to the input.
Anode to output, cathode ( the band ) to the input of the 7812.
The 7812 is sensitive to reverse...
Since you have a PWM signal, it is easy to send a sinewave .
Maintain the PWM signal frequency accurate, modulate the duty cycle.
Lets say: you have a 100 KHZ PWM signal that is 50 % duty cycle.
Take the modulating sinewave to vary the duty cycle from 10 % to 90 %.
Down stream the receiver for...
Andy:
A solution for you is to use a DC motor used for moving the wind-shield wipers in a car or using the motor driving the fan for the radiator.
The voltage generated would be around 15 volts if yu drive them around 3 to 4000 RPM.
The current output would be the rating of the motor at full...
Gentlemen:
I am looking for In-expensive Brushless motors, 3 phase, two ball bearings to be used as generators.
Step-motors will do as well.
Maybe two phase.
Power : 20 to 100 wats and may be higher.
RPM :Below 3000 , without gears.
Voltage : greater than 12 volts, up to 100 volts,
Cost is...
Yes, you can use a PWM controller to run the motor at a set RPM and you could make everything analog.
What is the RPM accuracy you need to attain ?.
Question what is the power of the motor and the voltage.
How many are you going to build ?.
If you need more info let me know.
Nandos
I am looking for Brushless motors to be used as 3 phase Voltage generators to rectify the AC output to charge batteries, at low to moderate RPM (less than 3000 RPM and preferable lower).
Low cost is basically important.
Shape is immaterial, the power source will be Wind Mills or Small hydro...
The starting current of the motor needs to be analyzed if the motor is loaded or not.
Though, the motor will require additional current to start the run and it is going to be difficult to have it reduced.
The problem that I had, somewhat close to yours, was solved by having an additional...
The cost of the 120 Vac to 18 VDC/15 amps converter is going to be higher than buying a 115 VAC saw with the same capabilities and size.
Also, there is the need to check the starting current of your unit that may force you to buy a much higher current capability converter
Nando
