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Results tagged with power-electronics
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user 3505
2
votes
Accepted
AC Harmonics on a system appearing as DC
In general, a load which is "symmetrical" with regard to the positive and negative half-cycles of the mains will only generate odd harmonics. If the load is not symmetrical and the current waveforms a …
- 11.1k
0
votes
How Is a Gap Maintained Between the Stators and Rotors in Axial Flux Motors?
Disclaimer: my only experience with a motor like this was investigation of my old e-bike motor.
Aren't the forces all in the plane of the rotor? Using the right or left-hand rules (I can never remembe …
- 11.1k
1
vote
Why does 4-wire resistance measurement change after a period of time?
From the Keithly documentation:
The ohms current and voltage sensing leads are separately
connected to the base of the single-pin probe tips.
I'd say that is your problem. Usually for 4-wire you mea …
- 11.1k
2
votes
Accepted
Modeling a simple capacitor
Capacitance only depends on its geometry, ...
False. Capacitance is also determined by the dielectric (the insulator) between the plates and this can have a huge effect on the value obtained.
... b …
- 11.1k
1
vote
How to find pixel density in LED Display Board?
4875 pixels at 1 mm pitch gives a screen width of 4875 mm = 4.875 m = 15.99 feet (16 feet).
975 pixels at 5 mm pitch is also 4875 mm.
244 pixels at 20 mm pitch is 4880 mm so it's almost the same.
H …
- 11.1k
1
vote
Accepted
Emulate normally closed relay with 2 normally open relays
You have a chance. This might work as a temporary solution.
Figure 1. Switching DLRs off with an NO when headlights are on.
How it works:
When the ignition is on and the headlights are off the h …
- 11.1k
1
vote
Accepted
What's the function of those coils there?
The aux contacts are normally closed ...
This is unlikely. I suggest that they are normally open and close before the main contacts do.
You haven't provided a link for the MR PQM 500 system but …
- 11.1k
0
votes
AC/DC Laptop adapter power losses
The 2.5 A current is the peak in charging up the internal high-voltage DC capacitors for the switching power supply.
In normal running the input power should be $$P_{in} = \frac {P_{out}} {efficiency} …
- 11.1k