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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Hi, I was wondering if you have a dc square wave for the field coils on a generator , would the gen produce more power if the field coil was spinning, or would it be like a transformer and just transfer power.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
A bit of both I guess: Changes in the field current would induce a voltage in the output by transformer action, and when the generator is spinning, the field current modulates the output. Bear in mind that generator field coils have very high inductance, so it's hard to make the field current change quickly.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Lots of answers to that one. Let's limit the discussion to rotating-field alternators, as used in cars, portable generators, and power plants.
1. There will be no output power without a load, of course.
2. As in DC-field operation, you can get LOTS more power out if the field is spinning. The extra power comes from the work to turn the rotor. Ordinarily, field winding needs power only because of its I2R loss.
3. How is a DC square wave different from a regular square wave? Let's assume you mean periodically reversing DC. With stationary rotor, there are some positions where there is NO output voltage and others where the induced output voltage is same or opposite polarity as your field voltage waveform. As Steve said, turning the rotor will give you a mixture -- a product waveform. Some people would find it interesting to model the system.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Thanks for the info, I'm going to see if I can pick up a motor and do some testing.
Done some testing, with reciftered ac I get about 1volt on the motor outputs, but spinning makes the voltages drop. Is that bemf? Can't measure the current as the multimeter amp reading are stuff, but should amps start being produced?
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Pulsesating field coil on generator
