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34 Threads found on edaboard.com: **Cos Phi**

Depending on the load type (**cos** **phi** respectively ratio of reactive and resistive load impedance), precise full wave switching can be quite difficult, particularly if **cos** **phi** isn't constant, e.g a transformer with variable load.
Avoiding saturation of transformers and other magnetic cores is an additional challenge. You (...)

Microcontrollers :: 05-04-2016 05:50 :: FvM :: Replies: **7** :: Views: **841**

any well behaved function can be the decomposed into a set of periodic functions (sin(nx) and **cos**(nx), in your example) and both are needed for the accurate description (you can write sin(nx+**phi**-n) but that is less elegant). sin(nx) and **cos**(nx) are the quadrature components.
Well said.
Another example that illus

Mathematics and Physics :: 04-14-2016 16:36 :: andre_teprom :: Replies: **22** :: Views: **2347**

Hello All,
I am working on Project of Measurement of Power factor with PIC18F4520 MCU with External
Crystal Osc 4 MHz and MPLAB XC8.
My Voltage ZCD and Current ZCD are working fine as checked on CRO.
Can any body give me given how to convert
Time value to **cos** (**phi**) in C. I am doing a

Microcontrollers :: 03-15-2016 12:53 :: karan123 :: Replies: **0** :: Views: **383**

Yes, there's a direct relation. But total power factor is the product of displacement power factor (**cos** **phi**) and distortion power factor. In case you know that **cos** **phi** is unity (no reactive power) you can convert THD to PF, as calculated in your example.
All calculations here

Power Electronics :: 06-25-2015 21:04 :: FvM :: Replies: **5** :: Views: **1604**

I do not understand coupler's function here. Anyway, It is a fact that if the LO phase changes, downconverted signal's phase changes. The amount of the phase changes will be the same. Think about trigonometric identities, sin at*sin bt, sin at*sin(bt-**phi**)?
See below multiplications:
sin(w1*t)***cos**(w2*t) yields a product at w1-w2 (...)

RF, Microwave, Antennas and Optics :: 04-08-2015 15:21 :: ferdem :: Replies: **2** :: Views: **565**

Hi,
if you have phase angle **phi** or **cos**(**phi**), then yes.
Klaus

Elementary Electronic Questions :: 03-19-2015 14:29 :: KlausST :: Replies: **2** :: Views: **560**

hi everybody,
can anybody expalin how to make 3D polar radiation pattern in matlab?
I am using UV plot where with mesh(x,y,z) command
x=sin(theta)**cos**(**phi**)
y=sin(theta)sin(**phi**)
ans
z=calculated gain
all are NxN square matrix
But I want to plot in polar form
Thanks
Hi, mns. This is my m-file for 3D radiation patt

Electromagnetic Design and Simulation :: 09-25-2014 02:42 :: doooo :: Replies: **0** :: Views: **3023**

One thing that helps a lot is a capacitor across the primary, for power factor correction. It greatly reduces current draw.
Apparently you assumed an unrealistic high magnetizing current in the simulation (**cos** **phi** at rated load < 0.3 !).
A point that hasn't been said yet, is the 12V/1A load expected permanently with no risk of di

Elementary Electronic Questions :: 09-25-2013 10:47 :: FvM :: Replies: **14** :: Views: **3300**

Try to use W.Mathematica or site

Mathematics and Physics :: 08-28-2013 08:14 :: riso :: Replies: **1** :: Views: **1291**

A sine wave traveling in +x direction can be represented by \**cos**(\omega {t}- kx+\**phi**).
As shown in the drawing attached where \**phi**=\frac{\pi}{2}:
a) Is a plot that holds t=0 and two waves along +x direction.
t=0\Rightarrow\; \**cos**(\omega {t}- kx+\**phi**)\;=\;\**cos**(- kx+\frac{\pi}{2})[/

Electromagnetic Design and Simulation :: 01-15-2013 18:36 :: Alan0354 :: Replies: **1** :: Views: **1042**

Dear Shanmuga
Hi
KVA , is supply power . but KW is active power . active power will given by : PS***cos** **phi** . and reactive power will given by PS* sin **phi** , and PS= sqrt((PA^2)+(PR^2))
Best Wishes
Goldsmith

Elementary Electronic Questions :: 07-04-2012 16:55 :: goldsmith :: Replies: **2** :: Views: **665**

Hi,
I have a question that seems simple but is surrounding my mind. From my understanding, a signal can be represented by its in-phase and quadrature componentes (which are low pass signals). The relationship is the following
A(t)***cos**(wt +**phi**(t) ) = si(t) * **cos**(wt) - sq(t) * sin(wt) , being si(t) and sq(t) the associated I and Q (...)

RF, Microwave, Antennas and Optics :: 06-01-2012 17:34 :: 0xEthan :: Replies: **1** :: Views: **896**

How to get the datasheet & speed vs. load characteristics of the SIEMENS motor ?
SIEMENS 3-Mot. 1LG0166-4AA7 0-Z EFF2
LMH 1007/800004378567
IP55 160L IM 132 kg B3 BRG DE 6309-2RZ C3
50 Hz
380/660V DELTA / Y (STAR)
15 KW 30.1 A / 17.4 A
EFF. 90.0 % **cos**(**phi**) 0.84

Elementary Electronic Questions :: 05-29-2012 16:37 :: phatcreators :: Replies: **7** :: Views: **1005**

Hello,
You can describe every sinusoidal signal based on V(t) = A***cos**(w*t+**phi**). At t = 0 the phasor (vector) describing the signal has length of A and has positive angle (w.r.t. x axis) of **phi** degrees. It rotates with omega (w) radians/s
You can decompose the phasor in its x (In-phase) component and y (quadrature) component. (...)

Digital communication :: 03-26-2012 19:00 :: WimRFP :: Replies: **1** :: Views: **3249**

Far field is a function of angular coordinates teta, **phi**. Therefore, Far field=E(teta, **phi**), normalized Far field=E(teta, **phi**)/Emax.
Far field of dipole f angular coordinate **phi** =1
%Far field of dipole f angular coordinate teta
t=-90:0.01:90;
E=**cos**(t*pi/180);
plot (t,E,'k');
grid on;
%Far field (...)

RF, Microwave, Antennas and Optics :: 03-14-2012 09:13 :: Marat86 :: Replies: **1** :: Views: **861**

can any one please help me in preparing the matlab code for the linear array antenna ...i want to apply kalman filtering to that chebyshev array ..i have doubt how to apply kalman filter to chebyshev array with some noise added to it..
and the array which i produced is
**phi**=0:0.01:2*pi; %0<**phi**<2*pi
shi=pi***cos**(**phi**); %For (...)

Digital Signal Processing :: 02-09-2012 13:49 :: priya.minny :: Replies: **0** :: Views: **1165**

In 3-phase system...
P = SQRT(3) * U * I * PF
PF = **cos**(**phi**)
S? = P? + Q?
P = S * **cos**(**phi**)
Q = S * sin(**phi**)
More details..................
Three-phase - Wikipedia, the free encyclopedia
[url=en.wikipe

Elementary Electronic Questions :: 12-17-2011 17:58 :: kak111 :: Replies: **1** :: Views: **714**

Hello
I have a project to simulate radiation pattern of circular loop antenna. I have D=fn(theta,**phi**), and I do transform from theta,**phi** to x,y,z by these equations:
x=D.*sin(theta).***cos**(**phi**)
y=D.*sin(theta).*sin(**phi**)
z=D.***cos**(theta)
I managed to get radiation pattern in X-Y, Y-Z, X-Z (...)

Electromagnetic Design and Simulation :: 11-27-2011 19:24 :: engcu90 :: Replies: **1** :: Views: **9476**

how i can plot an azimuth and elevation planes for E= sin(theta).***cos**(**phi**) or E= **cos**(theta).***cos**(**phi**) or E= sin(theta).*sin(**phi**) etc {matlab code } ??

RF, Microwave, Antennas and Optics :: 10-27-2011 21:18 :: barcawi23 :: Replies: **0** :: Views: **999**

Under the precondition of linearity you are allowed to treat a sum of different sinusoidal inputs separately.
Example: Vin1: **cos**(wt) and Vin2=j*sin(wt).
Thus, according to Euler: Vin=Vin1+Vin2=exp(jwt).
The ouput of a linear system also is a function of exp(jwt) and - in addition - it contains a phase shift exp(j***phi**).
You always can come back to

Digital Signal Processing :: 08-11-2011 13:33 :: LvW :: Replies: **5** :: Views: **885**

hi it possible plotting far field in function of sin(theta)**cos**(**phi**) and sin(theta)sin(**phi**) instead of theta and **phi**?

Electromagnetic Design and Simulation :: 03-15-2011 15:33 :: pizzotta :: Replies: **0** :: Views: **1069**

hi it possible plotting far field in function of sin(theta)**cos**(**phi**) and sin(theta)sin(**phi**) instead of theta and **phi**?

Elementary Electronic Questions :: 03-15-2011 14:41 :: pizzotta :: Replies: **0** :: Views: **684**

Well, first you just need to define the array factor for circular array. LMS and RLS basically give weights that wil help in removing interference, noise or whatever.
The array factor for a Uniform circular array is
AF(theta, **phi**) = exp(j*(2*pi/lambda)*radius*sin(theta)***cos**(**phi**-**phi**_n))
theta is elevation, (...)

Digital Signal Processing :: 11-24-2010 08:28 :: anmol :: Replies: **3** :: Views: **1883**

Hi,
I am wondering how should we classify the demodulation circuit for demodulating a signal c+|m|**cos**(wt + **phi**) by
inphase => **phi** = 0 ; offphase => **phi** = pi; and |m| is the message signal
demodulation method: signal(inphase) - signal(off-phase)
what does this demodulation represent?
thanks

Elementary Electronic Questions :: 07-30-2010 14:27 :: watertreader :: Replies: **3** :: Views: **949**

So I'm doing some digital signal processing. I have a a current and a voltage signal that I am multiplying together and then filtering through a lowpass filter to get a signal that equals A*B***cos**(**phi**)/2. At this point I want to find **phi**, so I need the inverse **cos**ine function.
Unfortunatly I'm having troubles trying to (...)

Digital Signal Processing :: 06-18-2010 21:56 :: rawbus :: Replies: **3** :: Views: **2251**

Hello, can somebody give me advice how to calculate the power consumption of the transformer's primary choke, when no load is applied to secondary winding please?
My transformer parameters are:
primary winding voltage rate = 230V
primary choke impedance = 2000 Ohms
I just know only abut this formula P = V * I * **cos**(**phi**) but this is probab

Power Electronics :: 06-11-2010 08:08 :: Tukan :: Replies: **0** :: Views: **1035**

What is the frequency? 50Hz or 60Hz?
If it is 50Hz, cycle time is 20ms.
So the phase difference in degrees between current and voltage will be
**phi** = t x 360 / 20ms
**phi** = 20ms x 360 / 20ms
**phi** = 360° or 0°
Hence, PF = **cos**(**phi**) = **cos**(0) = 1

Microcontrollers :: 09-04-2009 03:47 :: CMOS :: Replies: **3** :: Views: **2098**

This will make final equation shorter
**cos**(180-x) = - **cos** x

Mathematics and Physics :: 04-05-2009 23:30 :: elektryk :: Replies: **3** :: Views: **3499**

Hi mujee, try replacing **cos**^2(**phi**) with **cos**(**phi**)^2

Digital communication :: 05-10-2007 09:59 :: echo47 :: Replies: **8** :: Views: **7674**

I measure R,S,T phase **cos** **phi** on three phase systems .
How can calculate avereging **cos** **phi**?.I need one **cos** **phi** value.But this value must be vectorial averege....
Regards...

Professional Hardware and Electronics Design :: 12-14-2006 18:12 :: fuzzy :: Replies: **0** :: Views: **2161**

I measure R,S,T phase **cos** **phi** on three phase systems .
How can calculate avereging **cos** **phi**?.I need one **cos** **phi** value.But this value must be vectorial averege....
Regards...

Microcontrollers :: 12-13-2006 20:53 :: fuzzy :: Replies: **0** :: Views: **1276**

Hi johnchau123,
you need to know what is the modulating signal.
A modulated signal A***cos** is a PM modulation with **phi**(t) as modulating signal, or FM with 1/(2*pi)*d(**phi**)/dt as modulating signal.
Regards
Z

Elementary Electronic Questions :: 10-18-2006 22:08 :: zorro :: Replies: **3** :: Views: **1112**

Hi electronics_kumar,
What is the modulating signal?
The signal
x(t)=A***cos**(wt + **phi**(t))
can be either PM with a modulating **phi**(t), or FM with modulating d(**phi**)/dt (the derivative of **phi**(t)).
Regards
Z

Elementary Electronic Questions :: 03-01-2006 23:26 :: zorro :: Replies: **7** :: Views: **1302**

Hi all, I have a question about something that I've never completely understood.
It is about reactive power:
When it is said that **cos**(**phi**) is, say, 0.7 (I just pick it from the air).
Does it mean that the motor requires this phasedifference and doesn't work well if it doesn't get it, or does it mean that it pulls the phase between S and P to

Robotics and Automation Forum :: 08-12-2004 08:45 :: StoppTidigare :: Replies: **6** :: Views: **10638**

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