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Search: Posts Made By: Dave H
Showing results 1 to 25 of 500
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Forum: Radio and Electronics
05-10-2021, 10:03 AM
Replies: 136
Views: 17,121
Posted By Dave H

Sermos / Anderson Power Poles do have a separate...

Sermos / Anderson Power Poles do have a separate stainless spring. Provisions are included in the housing to connect multiple housings in a way that can be used to prevent reverse connections.
...
Forum: Radio and Electronics
05-10-2021, 08:45 AM
Replies: 136
Views: 17,121
Posted By Dave H

I did read the papers. Including the section...

I did read the papers. Including the section describing the active current conversion or commutation process. These 3 schematics along with the associated descriptive text illustrate some of what is...
Forum: Radio and Electronics
05-09-2021, 08:57 AM
Replies: 136
Views: 17,121
Posted By Dave H

We used to, there were always hot soldering irons...

We used to, there were always hot soldering irons in the pits back in the day. I'm surprised it hasn't came back for stock racers always looking for an edge. Maybe it has and I just haven't seen it.
Forum: Radio and Electronics
05-09-2021, 08:35 AM
Replies: 136
Views: 17,121
Posted By Dave H

Output waveform, neither exact of course, which...

Output waveform, neither exact of course, which best represents the output?
...
Forum: Radio and Electronics
05-08-2021, 06:25 PM
Replies: 136
Views: 17,121
Posted By Dave H

The signal is straight forward. The graphs are...

The signal is straight forward. The graphs are baseline data from these ieee papers.

Reducing torque ripple of brushless DC motor by varying input voltage...
Forum: Radio and Electronics
05-07-2021, 02:50 PM
Replies: 136
Views: 17,121
Posted By Dave H

I found some current data. More realistic than...

I found some current data. More realistic than the overly simple graph from my previous post, these show the complexity of the waveform much better.
...
Forum: Radio and Electronics
05-07-2021, 09:28 AM
Replies: 136
Views: 17,121
Posted By Dave H

Direct current is current going in only one...

Direct current is current going in only one direction, not reversing with time. In practice also used for voltage, maintain same polarity over time. The esc output signals are made up of DC segments,...
Forum: Radio and Electronics
05-05-2021, 07:24 PM
Replies: 136
Views: 17,121
Posted By Dave H

Apex Microtechnology Brushless Motor Driver...

Apex Microtechnology Brushless Motor Driver Application Notes (https://www.apexanalog.com/resources/appnotes/an45u.pdf)

A clip indicating the current flow at the a-b-c esc outputs during each of...
Forum: Radio and Electronics
05-04-2021, 08:48 PM
Replies: 136
Views: 17,121
Posted By Dave H

I believe they are voltage traces. Are you...

I believe they are voltage traces. Are you referring to the phase shift between? I haven't been able to find any current traces, did find some predictive stuff, just filtered edges as expected thou....
Forum: Radio and Electronics
05-04-2021, 07:01 PM
Replies: 136
Views: 17,121
Posted By Dave H

Acts like ac, functions like ac, that's the part...

Acts like ac, functions like ac, that's the part I find interesting and useful.
Forum: Radio and Electronics
05-04-2021, 02:01 PM
Replies: 136
Views: 17,121
Posted By Dave H

Perhaps this can help, post and video. Seems...

Perhaps this can help, post and video. Seems similar to many others.

How Brushless Motor and ESC Work...
Forum: Radio and Electronics
05-02-2021, 02:50 PM
Replies: 136
Views: 17,121
Posted By Dave H

Only ac isn't really right either, it's more...

Only ac isn't really right either, it's more complicated than saying only ac, or just dc, chopped dc, etc. The brushless esc produces three phased alternating waveforms but it's subtly different than...
Forum: Radio and Electronics
05-02-2021, 08:07 AM
Replies: 136
Views: 17,121
Posted By Dave H

Even brushed motors operate on current that...

Even brushed motors operate on current that reverses direction, the definition of alternating current. The brushes and spinning commutator do the switching for the windings.
Forum: Vintage Forum
05-01-2021, 06:22 PM
Replies: 21
Views: 6,546
Posted By Dave H

Who said it's not rebuildable? hehe

Who said it's not rebuildable? hehe
Forum: Vintage Forum
05-01-2021, 05:40 PM
Replies: 21
Views: 6,546
Posted By Dave H

Lots of awesome there. I like the speed control,...

Lots of awesome there. I like the speed control, motor connector, and tires. Those B&R motors were cranked just a bit.
Best part might be the chassis, doesn't appear to be cut down or drilled like...
Forum: Rookie Zone
04-30-2021, 06:36 PM
Replies: 10
Views: 1,380
Posted By Dave H

A possible pitfall with public money for the...

A possible pitfall with public money for the track is running private races if that is part of your plans. I've seen a couple tracks built in parks and other city property, not sure but I think with...
Forum: Radio and Electronics
04-27-2021, 06:12 AM
Replies: 136
Views: 17,121
Posted By Dave H

Little experiments like this are excellent ways...

Little experiments like this are excellent ways to help understand. Perhaps next try the same with DC sources, say using one or three batteries. See what happens.

Another simple experiment to try,...
Forum: Radio and Electronics
04-25-2021, 10:21 PM
Replies: 136
Views: 17,121
Posted By Dave H

It's showing the 3 outputs. Note how they change,...

It's showing the 3 outputs. Note how they change, on the bottom are cyan full volt pulses, then it's off segment where the emf in the middle area drifts up, then cyan shows up at the top. Can also...
Forum: Radio and Electronics
04-25-2021, 08:42 AM
Replies: 136
Views: 17,121
Posted By Dave H

Weird how this oscilloscope connected to esc...

Weird how this oscilloscope connected to esc outputs appears to show reversing polarity.
...
Forum: Radio and Electronics
04-24-2021, 11:50 AM
Replies: 13
Views: 1,504
Posted By Dave H

Is this what you mean by semicircle type? ...

Is this what you mean by semicircle type?
https://cimg4.ibsrv.net/gimg/www.rctech.net-vbulletin/800x400/1619290181_a9494d507c34f01a94e8daf4e887fc7cfc134a47.jpeg
Forum: Electric Off-Road
04-24-2021, 11:35 AM
Replies: 16
Views: 2,145
Posted By Dave H

To measure it accurately use a torque cell /...

To measure it accurately use a torque cell / sensor. 2 types, static non spinning, and dynamic for spinning shafts. It is also possible to create a custom cell with strain gages if you have a...
Forum: Radio and Electronics
04-23-2021, 09:08 AM
Replies: 136
Views: 17,121
Posted By Dave H

nm

nm
Forum: Radio and Electronics
04-23-2021, 08:43 AM
Replies: 37
Views: 21,267
Posted By Dave H

Do these chargers have a servo test function? If...

Do these chargers have a servo test function? If you are asking based on seeing a port on the charger, that might be for an optional temperature sensor.
Forum: RC Boating
04-21-2021, 08:54 AM
Replies: 5
Views: 794
Posted By Dave H

One other option is using a electronic speed...

One other option is using a electronic speed control (ESC), that would add a variable speed capability which might be helpful for control. If the pump is reversible that could be used too.
Forum: Vintage Forum
04-17-2021, 12:43 PM
Replies: 7
Views: 2,137
Posted By Dave H

Correct the caps are just to filter out some of...

Correct the caps are just to filter out some of the higher frequency switching noise, not reduce any effective voltage.

Some ESCs used a Schottky diode on the motor, like these associated ones...
Showing results 1 to 25 of 500
 
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