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Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Some do have the lamp pin, I think circa 1990 and some have single terminal. My truck has the lamp circuit incorporated into a lamp test system to prove test the brake fluid warning light and the power steering pump belt when started up.
As to converting to motors, I have done this by feeding stator with three phase voltage sans diodes. The machine will turn poorly but if DC is applied to the rotor through the brushes in sequence it will then lock into step and the thing becomes a syncronous motor, that can display leading, unity, or lagging power factor depending upon the DC excitation and the amount of torque it provides to a load.
As motors go, this is perhaps the poorest. The whole exercise was to bring a functional 3 phase network operating at 10 volts to a demonstration table.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
radiotech wrote ...
Some do have the lamp pin, I think circa 1990 and some have single terminal. My truck has the lamp circuit incorporated into a lamp test system to prove test the brake fluid warning light and the power steering pump belt when started up.
As to converting to motors, I have done this by feeding stator with three phase voltage sans diodes. The machine will turn poorly but if DC is applied to the rotor through the brushes in sequence it will then lock into step and the thing becomes a syncronous motor, that can display leading, unity, or lagging power factor depending upon the DC excitation and the amount of torque it provides to a load.
I 'sort of' assumed this was the case. I don't think it will be that efficient, from the torque point of view.
I wasn't saying you were wrong, Radiotech, I was just adding what I'd learned from experience.
I am aware that there is 'usually' enough 'residual magnetism' to 'get things going', given enough revs.
I have other generators (240V, tweaked to 300V) that need 'sparking up' from a 12V battery to 'get going'.
radiotech wrote ...
As motors go, this is perhaps the poorest. The whole exercise was to bring a functional 3 phase network operating at 10 volts to a demonstration table.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
I sure know what you mean by sparking up. As electricians in a plant with ancient equipment, we operated exiter generators that often would not 'build' (shunt conected) and worse, if the conditions were right, they would build in reverse, so sparking a battery across the bus, was needed.
Mostly they did not need it, however is something blew the fuses and shut the prime driver down, trouble happened sometimes. These were 125 volt machines, 20 kW, exciters for groups of syncronous motors driving pumps.
I'm wondering about the youtube videos. or more precisely why there are so many just repeating running an alternator off an rc speed controller. A few provides proof but there are quite a few and unlike a scientific review none of them seem to post load tests or instrumentation or any kind. there is no data other than proof that you can run a generator as a motor like we learn in elementary school.
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Automotive alternator to Brush-less motor conversion
