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Author Topic: Stepper Motor Phase Shift and Speedup,,,,  (Read 2608 times)

Offline stivep

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Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #15 on: November 25, 2022, 04:12:46 PM »
I thought it was pretty clear where it was connected to.
If you understand how a transformer and an oscilloscope works, you would understand that it is connected properly.
Where are the professionals?
The video is fine. It explains perfectly how it is set up then shows the anomaly.
ADD: This is one of the most interesting videos I have seen on this site. Thank you Flood.

I'm not fighting with your position.
I'm not criticizing.
It is how it works and what it triggers :
-the reaction causing start off engineering and/or scientific  evaluation of any phenomena in question.

In civilized modern world:

-Generally people don't care: what you have, who you are, what do you want to present, or who you represent.
The exemption to that rule : when "expectation"  is on the table.


presentation creates curiosity,
 curiosity creates, attention,
 attention creates reaction evolving into action:
example : that is why presentation of nice young legs in the short skirt helps girls eventually to get married before it is too late,
as younger competition is growing up= action

questions previously addressed to content creator:
https://www.youtube.com/watch?v=NUB2yY_PNFU
- what do you need transformer for?
- why can't you make the same without transformer?
should be precisely answered !.



example :
question: - what is the channel number 1 of the oscilloscope connected to?
must  be answered absolutely not in this form:
I thought it was pretty clear where it was connected to.
If you understand how a transformer and an oscilloscope works, you would understand that it is connected properly.

My answer:
- the weekly check in $$ to my secretary or my office assistants is not based on Tarsier_79 comment.
-all of the  girls are not interested with how obvious for them is Tarsier_79 response.

They should put on my table:
-PDF of the fluke multimeter Fluke 26 III
-PDF of the oscilloscope and generator FNIRSI-1014D
-identified  components of the test.( oscilloscope probes, transformer model#and MFG. e.t.c)
- reason for analysis, estimated evaluation time, expected outcome,

_________________________________________________________________

typically it looks like this:
case# .....
1. presenter created video content ,- phenomena and DUT are in question.
2. instruments characteristics, model and type are not  listed.
3. schematic, connection is not listed.
4. recommended action:
-to be reviewed - recommended in your own time after hours.
-time required ~ 2h.


Wesley

Offline kajunbee

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Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #16 on: November 25, 2022, 04:35:49 PM »
https://www.psma.com/sites/default/files/uploads/tech-forums-magnetics/presentations/is023-winding-capacitance.pdf

Correct me if I am wrong but the conclusion is that the effect is due to capacitance. In the link provided it shows 3 capacitors which represent a transformers interwinding capacitance. So initially with no load the source (stepper motor) only sees the primary capacitance. But once load is connected and there is current in secondary the source now sees the total combined capacitance. This sound about right or is it a little more complicated than that.

Offline stivep

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Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #17 on: November 26, 2022, 12:03:20 AM »
https://www.sciencedirect.com/science/article/abs/pii/S0142061519337688
Impact of high-frequency harmonics (0–9 kHz)
 current harmonics circulating in a transformer winding

https://www.elprocus.com/harmonic-distortion-types-and-its-causes/
Harmonic Distortion

can you make another video where you connect:
-channel number one of your oscilloscope into stepper motor and show the signal shape
-channel number two  of your oscilloscope into output of your transformer  and show the signal shape
while sweeping up to 50 kHz.

can you present schematic of the assembly?
Wesley

Offline floodrod

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    • Mooker.Com- Energy Discovery Forums
Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #18 on: November 26, 2022, 12:31:49 AM »

can you make another video where you connect:
-channel number one of your oscilloscope into stepper motor and show the signal shape
-channel number two  of your oscilloscope into output of your transformer  and show the signal shape
while sweeping up to 50 kHz.

can you present schematic of the assembly?
Wesley

As I said earlier, it really doesn't matter because it has been confirmed the anomaly has nothing to do with the stepper..

Hook up a signal generator with a resistor on the secondary, the transformer does the same thing when being hit with 2KHz..  Without the stepper..  All the stepper did was give me a real high frequency generator that rotates.

This is kinda like replicating Thane H..'s  Bi torroid..  He achieves the phase shift and his motor speeds up when pulling a load,  but the load current sucks and the process adds nothing back..


Offline floodrod

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    • Mooker.Com- Energy Discovery Forums
Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #19 on: November 27, 2022, 06:54:09 PM »
...

« Last Edit: November 28, 2022, 12:30:33 AM by floodrod »

Offline zncdl

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  • Posts: 8
Re: Stepper Motor Phase Shift and Speedup,,,,
« Reply #20 on: May 03, 2023, 04:01:14 PM »
The high-frequency output torque of stepper motors drops rapidly and steeply because the input current is reduced. When used as a generator, the output efficiency of high-frequency power generation is also low.