Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [sinusoidal]

30 questions
6
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1 answer

Find the phase angle between two functions

Apologies if this is better suited for a mathematics forum, it's from my circuits textbook so I've decided to post here. Below is a practice problem from the textbook, with the provided solution. If I try to convert i1 to a positive cosine…
Aaron
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1 answer

Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to maximise the utilisation of your DClink voltage…
Ahmed Eshra
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4
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1 answer

Summing RMS values proof

I have a simple circuit with two sources of different frequencies. I was tasked to get a voltage output across a component. I know for a fact that adding the derived voltage of both sources acting independently will yield the peak voltage when both…
Arcadius
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3
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1 answer

How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid back-EMF such as the one he is using. The code…
Ahmed Eshra
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2
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1 answer

Can FOC be done with only one PID controller and a lookup-table that determines phase-offset?

Normally two PIDs are used to do torque-control with FOC -- one for the direct torque and one for quadrature torque. The reason for this is described here: Why are two PID controllers needed for FOC (Field Oriented Control)? Assume that I…
Dan Sandberg
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2 answers

How to calculate the average voltage and VRMS of a non sinusoidal waveform

I need to calculate the average voltage and VRMS of this. It's given that Vp=41V, Vn=-6V and T=13ms. I know the answer for the average voltage is 12.8V, but I can't find the formula that gets this result anywhere, same thing about the VRMS value.
Parstoukas
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How does Kirchoff's current law work for sinusoidal voltage sources?

I was solving a steady state question with sinusoidal AC voltage source and the solution for the question used Kirchoff's current law to find the nodal voltage of a node. Now, I used to think that I could only use kcl for DC sources and not for AC…
Sam1470
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Can AC harmonic quantities be expressed as a sum of phasors of different frequencies without confusion?

https://www.electronics-tutorials.ws/accircuits/harmonics.html The problem with AC harmonics is that each term has a different frequency, being a integer factor of the first frequency. I was wondering if there was a way to conveniently express…
AndroidV11
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What is the importance of peak factor and form factor?

I get that form factor and peak factor are suppose to be ratios involving the RMS, maximum and average values of current or voltage for AC circuits, but I don't get specifically why those ratios are important that they need a special name. Is there…
AndroidV11
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Why do sensors or biosensors use AC excitation signal and not square wave signal?

I have recently started looking into transducers to measure a natural physical phenomena. The sensors I read about, especially electrochemical sensors like interdigital electrodes use a sinusoidal signal to enable the sensor electrodes. I came…
David Norman
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Finding the total impedance and voltage across open terminals

The question that I'm trying to solve is the following: In the circuit shown below, what is the total impedance in ohms across the open terminals? What is \$v_{T}\$ if \$v_{L}\$ is 80 vrms? This is how I solved the problem. I let \$Z_{1}\$ be…
romeoPH
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how to implement external sinusoidal commutation using encoder feedback in BLAC motor?

I have a linear permanent magnet synchronous motor with sinusoidal back-EMF and a sinusoidal driver with current operation which takes two reference sine waves with a 120-degree phase difference, insert them in a current loop, and produces the three…
Meisam Mehrabi
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0
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1 answer

Can a modified square wave (average square wave in each discrete time interval) be made from only full bridge inverter without transformer, LC filter?

I'm studying about inverter PWM with textbook. The similar one with attached figure is in the textbook. I can understand how the blue chopped square voltage is made. In the text book, the red curve is the average voltage. I can understand that. But…
user331400
0
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3 answers

Painfully Yet Steadily Growing Oscillator Output

I have worked out an LC-based Colpitts Oscillator (sharing the schematics) that produces output which grows painfully slow from 10 pV to 500 mV in more than to 3 minutes and settles there. Despite banging my head loads, I have been unable to solve…
Awais Mushtaq
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ERROR LTSpice from V tp gV

i have a problem here, it should be a sin but here is what i get and the Vin is in V and Vout is in Giga-Volt, which is wrong, what should I do?
Maya
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