meta user
network profile
| bio | website | |
|---|---|---|
| location | ||
| age | ||
| visits | member for | 1 year, 4 months |
| seen | 2 hours ago | |
| stats | profile views | 12 |
|
20h |
answered | What are the factors that significantly affect the life span of a DC motor? |
|
May 15 |
comment |
Capacitors and capacitance I just think that is sloppy language. If an equal amount of electrons enters and leaves a cap, in what sense does it store charge? It doesn't. It stores energy. We would say something stores charge if it collected way more electrons or protons than it started out with. But that's not what a capacitor does. I think the confusion is that each individual plate in a typical capacitor does store charge but the capacitor as a whole doesn't. |
|
May 15 |
comment |
Capacitors and capacitance But they don't store charge any more than, say, a copper wire stores charge. Again, a cap has the same number of electrons and protons in it before and after "charging" ... the only difference is where those charges are located in the cap. When you "charge" a capacitor you are storing energy, not charge (big difference). And yes voltage is potential difference between charges and that's exactly what you have in a "charged" capacitor. |
|
May 15 |
comment |
Capacitors and capacitance Regarding point 2, capacitors don't "hold" charge, they store energy. The total number of electrons in a capacitor is the same before and after "charging." The charges are just arranged differently (positive charge on one plate and negative on the other). And separated charge is really just another name for voltage. |
|
May 15 |
comment |
Battery powering an unknown DC motor There is some misinformation in this answer about DC motors. See my answer below. |
|
May 15 |
answered | Battery powering an unknown DC motor |
|
Apr 9 |
answered | AC motor Low RPM problem |
|
Apr 9 |
comment |
AC motor Low RPM problem Do you mean that your speed at no load is 3000 RPM? That is what a typical 2 pole AC induction motor's no load speed would be at 50 Hz. |
|
Feb 17 |
comment |
Why Tesla car use AC motor instead of DC one? Well, I was talking about vector control of induction motors rather than a simple V/Hz control. Tesla would need to use the former, rather than the latter. |
|
Feb 17 |
awarded | Nice Answer |
|
Feb 17 |
awarded | Yearling |
|
Feb 17 |
comment |
Why Tesla car use AC motor instead of DC one? Haha... that was unintentionally on my part. |
|
Feb 17 |
answered | Why Tesla car use AC motor instead of DC one? |
|
Feb 17 |
comment |
what type of armature i should use in 12v dc magnetic 2 pole motor to get more than 8000Rpm I'm curious why you say a 2-pole DC motor is probably not self-starting? Assuming the windings are connected to the commutator correctly, he should have no problem with the motor starting. |
|
Feb 11 |
awarded | Commentator |
|
Feb 11 |
comment |
Replacing 6v dc motor with 12v dc motor for better speed You really haven't given enough information to give a good answer. My best guess is that the 12 V motor you bought is rated similarly to the original 6 V motor, so you wouldn't expect it to perform much differently. But as I said, that's just a guess. The way to make it go faster is to buy a different motor that is rated at a different speed. |
|
Jan 19 |
comment |
Calculate power supply on distance It doesn't matter what kind of insulation you have, your current density is almost 60 A/mm^2. That's a lot! I wouldn't be surprised if the wire fails almost instantly. I generally try to keep current density about 10 times less than that amout (4 to 6 A/mm^2). |
|
Jan 18 |
answered | In a DC motor, is there one commutation point that is optimal in all respects? |
|
Jan 9 |
comment |
Variable Reluctance Machines - what does the 6/4 or the 8/6 values mean? I understand that most questions require more than a single sentence but I didn't really feel it was necessary in this case. Even now I'm struggling to figure out what else I could add to my answer. But if you have any suggestions, I will gladly edit it. |
|
Jan 8 |
answered | Variable Reluctance Machines - what does the 6/4 or the 8/6 values mean? |
