# Search results

1. ### How to identify voltage or current to Opamp

Is it correct or wrong, can you please confirm?
2. ### How to identify voltage or current to Opamp

I can see a VBUS voltage applied at the top of the resistor but the complete VBUS will be dropped across the resistor R. The voltage at Pt1 is "VBUS" and the voltage at Pt2 is "Gnd". Is it correct? I am still confused. I am assuming that switch A and C' is closed. The switches A',B, B',C are open.
3. ### How to identify voltage or current to Opamp

Ok i understand, One additional question i forgot to ask and really i want to know is that the voltages V1 and hence V2 will be the back emf voltages from motor. Am i correct here?
4. ### How to identify voltage or current to Opamp

Ok, So if i understand correctly this is what it represents. Am i correct? There will be voltage V1 from the motor terminals and V2 after the voltage drop in the resistor. The difference voltage is what op amp will amplify.
5. ### How to identify voltage or current to Opamp

I have the following high level diagram and an application note for measuring the currents, i am confused with the inputs to the op-amp, how do i know if it is currents or voltages? I have attached the application note. I assume it is the currents.
6. ### Angle of load impedance

So for example the voltage and current are out of phase by 30Degrees. and the voltage leads the current by 30. From calculations the impedance leads by 30 Degrees. The author is referring to the +30 Degrees of impedance wrt voltage phase?
7. ### Angle of load impedance

The power per phase is defined as where i don't understand the term Theta. I know the phase angle between the voltage and current if there is reactance they are not in phase . What does the below statement mean?
8. ### Sources in same direction

I am bit confused when you say the sources are in same direction or opposite direction. I assume that if the currents are in the same direction then they are is same direction for example i have drawn below. Is it correct? Suppose if it is relatively complex circuit, still we can classify the...
9. ### Unit circle notation of sine and cos waveforms

I see lot of books representing the sine and cosine waveforms in terms of unit circle notation. Is there is any particular advantage doing this? I hope this unit circle representation is different from phasor notation or both of them same?
10. ### Direction of Magnetic field

Now i understand why you said this as per the below waveform One of the currents is always in the negative direction and the other two positive to get a 120 Deg waveform. Hence one of them should be "." and other two "x"
11. ### Direction of Magnetic field

I understand it is very tough for me to put across my questions, but this is what i am expecting, if see the bar magnet there is North and south pole and the field lines start from N and end at S. Similarly in the initial diagrams i wanted to know if they can be represented as N and the S poles...
12. ### Direction of Magnetic field

But I am doing position control, can you please explain what i have asked. I have referred another website and the original document the representations are correct only. It is only current at a particular instant, not sure what is wrong. Please help.
13. ### Direction of Magnetic field

I come to the actual problem i want to understand I am representing a stator with 3 winding's 120 degrees, I am trying to simulating rotating magnetic field. Now in a rotating magnetic field the net magnetic field Bs will be rotating, Similarly in the document there is North and South pole also...
14. ### Direction of Magnetic field

I am trying to understand the basics of magnetic field, if I know this answer i have one more clarification to ask Based on the magnetic field is my representation of North and South pole correct. The magnetic field originates at North pole and ends at South pole?
15. ### Number of windings clarification

Yes i got confused. Yes my mistake motor is a load. I need only one confirmation. The a', b', c' i have seen in the document and posted in #1 are same as the a', b', c' i have shown in the diagram (which i have drawn on my understanding). Basically does both represent the Neutral?
16. ### Number of windings clarification

Is my understanding correct as shown The terminals a,b,c are the actual phase winding's. The a',b',c' are the neutral points are ground? Can you please confirm if my understanding is correct?
17. ### Number of windings clarification

This is the image i saw, referring to the explanation of the 3Phase Synchronous motors. The doc says it is an empty stator containing just 3 coils, each 120 Degrees apart around the surface of the machine. But I see 6, like abc,a'b'c'. What are these a'b'c' coils? When it is referred to 3 coils...
18. ### 3 Phase Alternator confusion

This is my thinking, When Rotor position 1, i thought it will first start inducing voltage in winding C. And when rotor is in position 2, does the voltage not first induce in stator winding B?
19. ### 3 Phase Alternator confusion

These are some doubts that i get, it is not related to the actual circuit, so please excuse if do not provide all the inputs, please let me know if i missed any inputs. In a 3 phase system the voltages are induced in particular order say ABC if the rotor rotates in Anti clockwise direction. Two...
20. ### Phasor Representation of voltage and current waveforms

I am sorry i did not understand when you said it is not a rotating vector. Does it make any difference? Can I use the RMS values for both rotating vector and static vector? And also how do i know if i am using RMS value or Peak value, do i need to indicate in the representation? I know static...