Quote:
Originally Posted by twoody
Peter
I have completed my windings. and have wired the stator with two sets of 6 coils. Each set of 6 has a resestance of 1.4 ohms. When I use 24 volt imput and ark to the windings my roter will turn about 5 times. But I am having trouble with the transistors. When I use my slot optical switch and send a low voltage on the base, the transistor turns on but I do not see the full 24 volts through the collector to the emitter. I could see in your video you have a neon light would this help? I can get the roter to just barly turn when I use the transistor but it will not keep the rotor turning. I have tryed a 2n3055, TIP31, and a high voltage nte2594. would the use of larger wire and sodering all connections make the differance as in your motor demos on youtube?
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Twoody,
Without seeing your complete schematic, I am only guessing, but from what you have said, I assume you are trying to drive the base of your output transistor directly from the output of the optical switch. The problem in this situation is that the output current able to be supplied by the optical device is much lower than the current drive needed to fully turn on your output transistors. Check the spec sheets for each device and you will see what I mean.
Go back and look at the ideas Jetijs was working with to create one or two stages of intermediate amplification between the optical switch and the output transistors. This may help you understand how to correct your problem.
Of the transistors you mentioned, the 2N3055 should work fine once there is enough drive. The neon bulb only protects the transistor from being burned out IF the recovery circuit is disconnected during operation.
I do recommend you solder your connections.
Peter