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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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What is this strange encoder motor?
Tim Wescott wrote:
On 08/02/2010 06:48 PM, Ignoramus18921 wrote: On 2010-08-03, Tim wrote: On 08/02/2010 04:50 PM, Ignoramus18921 wrote: Lots of new pictures here. [much snipping] Tim, how much angular accuracy could I get from this resolver, in pulses per revolution? Um -- pretty damn good? It's hard to say, because it varies with the resolver. But I'd expect anywhere between one and ten minutes of an arc (no, you don't get dimensions in degrees, or counts, when you're dealing with resolvers). Resolvers that do better than that generally go to "multi-speed" units, with a "high-speed" resolver that repeats itself 8, 16, or 32 times around the circle, and a "low-speed" (1x) resolver to tell you what quadrant of the high-speed resolver you're looking at. Iggy has a resolver, is it safe to say that an Inductosyn linear scale is the same type of device? I'm curious since I have a sick id od grinder at work that still has some issues after replacing the sliding head for the scale. Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller |
#2
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What is this strange encoder motor?
On Tue, 03 Aug 2010 17:59:44 -0400, Wes
wrote: Iggy has a resolver, is it safe to say that an Inductosyn linear scale is the same type of device? I'm curious since I have a sick id od grinder at work that still has some issues after replacing the sliding head for the scale. Wes It's the same thing, just laid out flat. db |
#3
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What is this strange encoder motor?
On 2010-08-03, Wes wrote:
Tim Wescott wrote: On 08/02/2010 06:48 PM, Ignoramus18921 wrote: On 2010-08-03, Tim wrote: On 08/02/2010 04:50 PM, Ignoramus18921 wrote: Lots of new pictures here. [much snipping] Tim, how much angular accuracy could I get from this resolver, in pulses per revolution? Um -- pretty damn good? It's hard to say, because it varies with the resolver. But I'd expect anywhere between one and ten minutes of an arc (no, you don't get dimensions in degrees, or counts, when you're dealing with resolvers). Resolvers that do better than that generally go to "multi-speed" units, with a "high-speed" resolver that repeats itself 8, 16, or 32 times around the circle, and a "low-speed" (1x) resolver to tell you what quadrant of the high-speed resolver you're looking at. Iggy has a resolver, is it safe to say that an Inductosyn linear scale is the same type of device? I'm curious since I have a sick id od grinder at work that still has some issues after replacing the sliding head for the scale. Jon might know, I have no clue. Who made that Inductosyn? |
#4
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What is this strange encoder motor?
Ignoramus30076 wrote:
Iggy has a resolver, is it safe to say that an Inductosyn linear scale is the same type of device? I'm curious since I have a sick id od grinder at work that still has some issues after replacing the sliding head for the scale. Jon might know, I have no clue. Who made that Inductosyn? An Inductosyn is similar in concept to a resolver, where a coil is energized with an AC field, and by varying magnetic coupling to other coils the position is detected. Inductosyn is a registered trademark of Farrand Controls, but their patent has run out. The classic Inductosyn has an exciting winding consisting of a serpentine trace on a PC board like material. Very close to this is another short piece with two serpentine traces of the same pitch a the spar. The two traces are offset by 1/4 of a pitch, to provide the quadrature relationship. The problem with the Inductosyn is that it takes a LOT of drive current to provide a useful signal from the sense windings, often several amps of drive. Jon |
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