# Questions tagged [sinusoidal]

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### 3-phase BLDC motor control

We have a 3-phase BLDC motor with 3 Hall effect sensors. I believe the motor is star connected but the datasheet has little information and we are still trying to obtain this information from the ...
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1 vote
47 views

### 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 ...
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### Generate combined sinusoidal waveform (fundamental, 2nd, 3rd...) using PWM

I know that I can make sinusoidal waveform using SPWM, but how can I combine fundamental signal with different frequency signal (2nd, 3rd...) on a single signal created by SPWM?
53 views

### Negative Oscillating Signal with Op-Amp?

I am trying to design a Wein Bridge oscillator that oscillates with frequency 1.5 kHz using LM741 Op-Amp. I simulate it in LT-Spice and obtained sinusoidal oscillation going both positive and negative....
82 views

### What's the physical significance of a sinusoid's Bode magnitude?

What's the physical significance of a sinusoid's Bode plot's magnitude, at the sinusoid center frequency? Example: sin(wt), with w = 62.8 rad/s = 10 Hz. This has ...
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58 views

### Can a system get immediately to the sinusoidal steady state?

Suppose we have a theoretical LTI causal system with zero initial conditions and we apply a sinusoidal input at t=0. If the system is initially at rest, will the output be equal to H(ω)cos(ωt+Arg(H(w))...
63 views

### Sinusoidal Driving BLDC without FOC?

I want to drive my BLDC motor sinusoidal. In this point I want to model my system correctly to analyze it better. So I want to simulate it in simulink first. To get model with sinusoidal driving: I ...
51 views

### Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
111 views

### Are impedance calculations only specific to sinusoidal inputs?

All impedance formulae we've derived in my course and calculations e.g. combined impedances in series have all assumed sinusoidal steady state. My question is, does the notion of "impedance" ...
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197 views

### Design a triangular wave generator using a sinusoidal input

I've been going through online assignments regarding circuit designs. I've gotten a bit stuck on this one: Using a sinusoidal input voltage of amplitude 5 V and frequency 100 Hz, I need a triangular ...
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1k views

### How to convert sine to exponential form? [closed]

In this question, he converted the sinusoidal voltage to exponential voltage. what's the formula used here ? This is not the same one used in this video Here is the formula derived in the video
• 119
1 vote
45 views

### 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 ...
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### Usually AC quantities have the x-axis as time, but phase shifts are done in angles. How is there not a unit conflict?

This feels like a very specific and stupid question, but I have studied AC circuits for a while already. I just didn't think about it that much, but why is it established that the x-axis we use for ...
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238 views

### 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 ...
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1 vote
1k views

### 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 ...
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### Driving multiwinding current transformer

About the circuit below: I'm using a Current Transformer with two identical secondary windings, L1 and L2. I can use them indistinctively since they are 1:1. The relationship with the primary is 1000:...
278 views

### 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 (...
92 views

### Reference clock of 400 MHz oscillator or 20 MHz and multiply by 20?

I am trying to design a sinusoidal signal generator using AD9954 which is a Direct Digital Synthesis (DDS) with takes a maximum of 400 MHz crystal oscillator as reference frequency. It also has a ...
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1 vote
65 views

### 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 ...
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201 views

### 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 ...
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2k views

### 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 ...
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### 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 ...
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