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I think so, at least the ones in computer cases... I pulled one apart... it was a bios fan... The set up was just two transistors and two caps..
If you need to do this you might have to use a larger voltage to get you 3vac.. Have you tried the output of a 555 timer set for 60hz, to see if it works.
You can use a second 555 as an inverter to get the +/- 3V across the coil. Or you can just put a capacitor in series with the output of a single 555 which can give you pulses of +/- 3V.I'm trying to generate a "rotating magnetic field". This may be a silly question, but a 555 timer won't generate a +3 to -3 volt "alternating current", will it?
I have designed an IC chip for a watch circuit. The motors in watches are two coil stepping motors. The coils are powered intermittently only while the motor rotor is being positioned to the next step. It is a four phase drive sequence; +coil 1-, +coil2-, -coil1+, -coil2+, repeat. Each coil is driven with an H-bridge. The duty cycle of the current drive is very low to make the battery last as long as possible.
I have designed an IC chip for a watch circuit. The motors in watches are two coil stepping motors. The coils are powered intermittently only while the motor rotor is being positioned to the next step. It is a four phase drive sequence; +coil 1-, +coil2-, -coil1+, -coil2+, repeat. Each coil is driven with an H-bridge. The duty cycle of the current drive is very low to make the battery last as long as possible.
I have designed an IC chip for a watch circuit. The motors in watches are two coil stepping motors. The coils are powered intermittently only while the motor rotor is being positioned to the next step. It is a four phase drive sequence; +coil 1-, +coil2-, -coil1+, -coil2+, repeat. Each coil is driven with an H-bridge. The duty cycle of the current drive is very low to make the battery last as long as possible.