bigmoose wrote:Luke, there is always a twist and turn in the road. I went back and looked at your twin Turnigy bike build thread, and it looks like I have the new Generation 2 Turnigy C80100-130; and your build might have used the first Generation. My silver outrunner bell looks longer than yours and is 3.130 in. ish from memory. Also mine has a big, like 2 inch ish bearing on the stator bell, I also have the screws on each end. (ish is a technical term that means I'm too tired to go back downstairs and remeasure it... so I go from memory!)
That said, I may have much more dead space in my version of the C80100 near the fixed bell than you do.
Looking at my flux chart it implies my magnets are around 1.5 inches long. Do you know how long yours are?
Always a twist, isn't there?
Burtie wrote:Thud wrote:Burtie,
Can you (or anyone please) give quick explanation of the math to arive at the 34.3 deg?
I justified it to myself like this:
Given that we accept 120 mechanical degree spacing works for a 3 phase motor like this one.
The can has 14 evenly spaced magnets around it.
So for one revolution, the magnetic pattern repeats 7 times.
We could put a hall sensor in any one of 7 positions and it would give the same signal.
The spacing of those positions is 360/7 = 51.42 degrees.
But we need 3 equally spaced sensors, 51.42/3 = 17.14 degrees between the sensors (I think .)
Burtie wrote:I used the same type of latching sensors as Jeremy did, the Honeywell SS411A .
Tiberius wrote:Burtie wrote:I used the same type of latching sensors as Jeremy did, the Honeywell SS411A .
I was confused about this term "latching", as it struck me that what is wanted is a digital output but not latching. it turns out that Honeywell make a range of Hall sensors, with digital outputs, and that some of them are latching.
The SS411A is a bipolar, non-latching version.
gwhy! wrote:Hi Nick,
I am using the same halls SS411A and they do indeed latch . Strange that the data sheet you have pointed to says they are non-latching..
JEB wrote:... More magnetic flux required to change, less chance of changing at wrong time?
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