Car alternator to PMAC?

Electric Motors and Controllers
j bjork   10 kW

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Location: Linköping, Sweden

Re: Car alternator to PMAC?

Post by j bjork » Mar 28 2021 10:56am

Another thing that seems strange is it seems to always want to spin in reverse. Every time I have set it up on the nuc it spins in reverse, but there I can just change direction. And I just connect the phases and halls in any order and run self learn.

On the cheap controller I have found a few combinations where it spins fine in reverse, but only bad running forward.
I might have missed some combination possibly, but it sure seems a lot harder to find a good forward combination.

ShadowNightmares   1 W

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Joined: Nov 24 2019 1:15pm

Re: Car alternator to PMAC?

Post by ShadowNightmares » Mar 29 2021 1:43pm

j bjork wrote:
Mar 28 2021 10:56am
Another thing that seems strange is it seems to always want to spin in reverse. Every time I have set it up on the nuc it spins in reverse, but there I can just change direction. And I just connect the phases and halls in any order and run self learn.

On the cheap controller I have found a few combinations where it spins fine in reverse, but only bad running forward.
I might have missed some combination possibly, but it sure seems a lot harder to find a good forward combination.
Well, i tried to search for hall sensor problems, maybe you could search on RC filters for the signal
https://electronics.stackexchange.com/q ... or-problem

ShadowNightmares   1 W

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Re: Car alternator to PMAC?

Post by ShadowNightmares » Mar 29 2021 1:47pm

j bjork wrote:
Mar 28 2021 10:56am
Another thing that seems strange is it seems to always want to spin in reverse. Every time I have set it up on the nuc it spins in reverse, but there I can just change direction. And I just connect the phases and halls in any order and run self learn.

On the cheap controller I have found a few combinations where it spins fine in reverse, but only bad running forward.
I might have missed some combination possibly, but it sure seems a lot harder to find a good forward combination.
Also, Austiwawa's video talks about the 36 possible combinations of hall sensors and phases, did you tried all of those 36 and put it in an Excel spreadsheet?

monette999   100 mW

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Re: Car alternator to PMAC?

Post by monette999 » Apr 05 2021 10:02am

Hello DIY kollegues,
may I ask a question in this interesting discussion.
How do I find the correct sequence for synchronize rotor to stator.
I was able to set my falling edge and rising edge on the zero crossing of my sensor signal. How do I find stator U to Rotor Sensor U by test.

Here my test setup to set zero crossing.
How do I find UVW Stator to UVW Rotor by measure not by jepardy.

Sensor System works. When I attached it to the controller I had fail starts and that should not be!

Greetings RobertImageImageImageImageImageImage

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monette999   100 mW

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Re: Car alternator to PMAC?

Post by monette999 » Apr 05 2021 10:04am

Pictures and gif update
fig5.gif
fig5.gif (32.35 KiB) Viewed 54 times
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Image

j bjork   10 kW

10 kW
Posts: 947
Joined: Aug 31 2018 3:01pm
Location: Linköping, Sweden

Re: Car alternator to PMAC?

Post by j bjork » Apr 05 2021 10:41am

My alternators have all been 6 pole pairs, your sensor wheel seems to be for 8 pole pairs?

monette999   100 mW

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Joined: Dec 22 2020 9:24am

Re: Car alternator to PMAC?

Post by monette999 » Apr 05 2021 10:59am

Yes that is correct! Can you help?

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j bjork   10 kW

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Posts: 947
Joined: Aug 31 2018 3:01pm
Location: Linköping, Sweden

Re: Car alternator to PMAC?

Post by j bjork » Apr 05 2021 11:19am

Well, the signals from your sensors wont match the position of the magnets on the rotor if it is not the same number.

monette999   100 mW

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Re: Car alternator to PMAC?

Post by monette999 » Apr 05 2021 1:13pm

I have a 8 polepair rotor not 6 as others may haveImageImage

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fechter   100 GW

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Re: Car alternator to PMAC?

Post by fechter » Apr 05 2021 1:45pm

monette999 wrote:
Apr 05 2021 10:02am

I was able to set my falling edge and rising edge on the zero crossing of my sensor signal. How do I find stator U to Rotor Sensor U by test.
Unfortunately, this varies depending on what controller you are using. They are not consistent about the labeling. The only way I know is to trial-and-error using limited current so you don't blow anything up.

The optical encoder looks great!
"One test is worth a thousand opinions"

monette999   100 mW

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Joined: Dec 22 2020 9:24am

Re: Car alternator to PMAC?

Post by monette999 » Apr 06 2021 4:15pm

Hi is the spike on the lower measurement the EMF feedback pulse?Image

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