The shaft is a very light-weight array of printed copper strands on a hollow shaft. These copper strands are going along the shaft forming a commutator and there are 4 large magenets, square angled to each other surrounding the shaft. The shaft slides over the top of a fixed metal bar (part of the shell/case). The shaft is not physically supported at the end it slides into (where metal bar is attached) because enough support is provided via 2 supports at the opposite end (the shaft encoder stage and main joint). The shaft is driven by 4 brushes on springs at 90 degree angles to each other and are doubled up to form a 2 wire dc motor which works smoothly in either direction (minus the squeeking) at an expected power level (200 mA @ 5 v).
I haven't rung IBM about it jet thinking they would be the same as any other co but since you mention this i will give it a try :) One more thing to note, it has a stiker covering the protective cover of the shaft encoder circuitry saying "Caution: use capstan protective cover while cleaning vacuum columns". This looks quite clue-full, what is a capstan? Cheers! Mikael ----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Monday, September 02, 2002 10:28 PM > Was it Mikael who wrote on Saturday 31 August 2002 11:08: > > Hello everybody! > > I got given a device from some sort of industrial machine. The manufacturer > > is IBM but I cannot find any information on it. > > It has a shaft encoder and circuitry on it with a fibre optic lead, a wire > > lead with 5 pins and it also has 3 small plug outputs (ground, a, b). > > It has 2 gas in/out's, one has large plasic 30mm tube and other is a fixed > > 10mm tube connection on body. > > The body is mostly aluminium and part of motor casing looks stainless > > steel. It has the following labels: > > IBM part number 1766700 and ratings: 25A max, rpm 11,00 max, volts/krpm > > 4.5.. > > It also has a sticker saying "ETN. plant 51. Date:" and it also has a label > > saying Hopi electronics with date 4/29/85 > > When I open it up, it has 4 big magnets and a small toilet-roll type shaft > > that spins around serving no aparent purpose with 4 brushes contacting it. > > The device is rather bulky for the power of the motor so and since it > > produces no suction It obviously relys on getting it from somwhere. > > > > anyone know what this thing is? > > How was the shaft driven? Can you post a pic? Could be a tacho or resolver of > some sort. I would ignore the gas things in figuring out the electrical end. > I have also seen A.C. feedback encoders as a way of feeding back motor > position. Have you rang IBM, and asked for specs on that part. They're > surprisingly good at that. They even had a memory chip for an original XT > computer that featured a 16pin dil with another 16 pin dil soldered on top > and sold me one in the mid nineties :-/. > > -- > Regards, > > > Declan Moriarty > > > > > Applied Researches - Ireland's Foremost Electronic Hardware Genius > > A Slightly Serious(TM) Company > > Experience is like a comb, > that Life gives you - AFTER all your hair has fallen out! > -- > Author: Declan Moriarty > INET: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 > San Diego, California -- Public Internet access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Author: Mikael INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
