i salute the entire community!

below is a phasor diagram ;

a point got stuck in my head when the signal and systems were working

where I indicated with the red arrows, these arrows are always 0 -> 90 -> 180 -> 270 -> 360 is this happening because he is following in his form?
or do these arrows have a logic?

every answer will be honored. thanks in advance

 

It looks to me like the arrows are following a different convention then when I took the class, back in '67. BUT as long as a given presenter is consistent as to which direction is positive, it should not be allowed to cause confusion.

 

It looks to me like the arrows are following a different convention then when I took the class, back in '67. BUT as long as a given presenter is consistent as to which direction is positive, it should not be allowed to cause confusion.

so what can we say by looking at the given m(t) sinusoidal real signs relative to what is related to their direction? what is the rule for this?

 

I am not aware of a "rule" as such. it is much more just a convention as to how some folks describe it. At least I never heard it as a rule.

 

does anyone have any information about this?

 

Consider that "natural rotation" reverses at the equator, it would seem to depend on one's location.
AND, consider that if the vectors are "generator based", it will depend on which way the generator is spinning.
What remains vastly more important is to remain consistent within the presentation or discussion.

 

Consider that "natural rotation" reverses at the equator, it would seem to depend on one's location.
AND, consider that if the vectors are "generator based", it will depend on which way the generator is spinning.
What remains vastly more important is to remain consistent within the presentation or discussion.

I still don't quite understand what you're trying to say.
I mean, how do we decide which way it is based on what?

 

My point is that choosing which direction of rotation is "positive" in an expression is only important when it is referencing other expressions.
Consider the vectors used in motion analysis: Until a direction is added it is simply a number describing a variable. So a direction must be stated, which is always relative to some reference.
So the direction selected as being positive is usually done for convenience, unless it is a continuing "discussion" of some other relationship.
Consider the rotation of a rotating generator: It may be "clockwise" or it may be "counter-clockwise", depending on which end of the generator I am looking at. So if a "sign" is assigned to the rotation velocity, that will also depend on which end I am watching, and the observed value would have the opposite sign when I look at the other end.

The basis of the selection of direction would be based on what will produce the most clearly understood results. That means providing the clearest communications.