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# Cos Phi

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cos cos theta , phi and gamma , phi theta , theta phi
34 Threads found on edaboard.com: Cos Phi

## Pulse Skip Modulation for Inductive load

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 (...)

## Learning Fourier Series

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

## TIMER VALUE TO ANGLE for POWER FACTOR METER:

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

## Relationship between PF and THD

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

## Down conversion Reference delay

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 (...)

## how to calculate the ESR of the AC capacitor

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

## how to plot radiation pattern in matlab

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

## Related to use of transformer of 240/12 1amp to 440v

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

## Need information in deriving first integral of Bessel's function.

Try to use W.Mathematica or site

## Confuse about phase lead and lag of a wave.

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})[/

## Power Sytems Protection and Switch Gears Basic Question

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

## In phase and quadrature components of a sine wave and a cosine wave

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 (...)

## How to get the datasheet & speed vs. load characteristics of the SIEMENS motor ?

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

## In phase and quadrature components of a signal

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. (...)

## far field help in matlab plz ?

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 (...)

## kalman filtering for chebyshev array matlab code

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 (...)

## 300 kw koad amper detail answer

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

## 3D radiation pattern of cirular loop antenna - Matlab

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 (...)

## azimuth and elevation ?

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 } ??

## Theory question: freq, mag response

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

## HFSS far field variables

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

## HFSS far field variables

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

## circular array designs (beamforming)

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, (...)

## What does this demodulation represent?

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

## Cordic algorithm troubles

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 cosine function. Unfortunatly I'm having troubles trying to (...)

## Transformer's primary winding power consumption

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

## how to find power Factor Reg

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

## Converting equations.

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

## How to write cos squared of angle phi ?

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

## How to calculate average cos phi of three phase systems?

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...

## Help about cos phi average calculation

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...

## How to know whether equation describes a FM or PM signal?

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

## about nature of equation(PM or FM)

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

## cos(phi) and induction motors, reactive power ?

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