Even better: most filter inductors (chokes) are rated at plus/minus 20% of the nominal value as per manufacturer datasheets. Any conductive body has a certain finite inductance.



rev 2020.10.30.37923, The best answers are voted up and rise to the top, Electrical Engineering Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us. R = 4060 Ohms => L = 4060 / 377 => L = 10.77 H. Note 1: In my test I used a known inductor with the manufacturer label on it to show the validity of the method. Interesting. application/pdf The 60Hz AC that we get from the power grid is at a perfect frequency for this purpose. 2. are easy to identify. 23 0 obj <> endobj 21 0 obj <>stream

1. MEASURING MOTOR PARAMETERS What is the voltage drop across the 10ohm resistor? 4) Set the potentiometer to its maximum value (this is good practice, you start by presenting the maximum impedance to the power supply thereby minimizing the current, and move down the impedance from there). I "think" inorder to calculate the inductance , you have to know the number of turns and wires Gauge and other manufacturing properties of the motor , which most likely are not available. It only takes a minute to sign up. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Calculate the motor pole pairs using Equation 5 on page 4. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa.

Is "beyond your comprehension" an offensive phrase?

What determined whether someone received parish relief or went to the workhouse?

My idea is that although today, people in more developed places on earth, can buy equipment very easily (who doesn't have an oscilloscope or a signal generator, right?).

3.

Is it possible to define an internal model of ZFC which is not set-like and which is not elementary equivalent to any definable set-like model?

From a very young age I was always interested in reusing, recycling, and re-inventing the ways things are utilized and in broadening their current use or finding new purposes. In capacitive reactance, f is i…

I recommend reading about circuit theory, for a deeper understanding on that matter. For 10 mH you should use a sine generator set to 1KHz or so (you can use your phone and an app.). We should strive to do the best we can with what we have at hand. uuid:3ecabba6-19f5-4319-999e-08b10e232ec4 Why is the following method incorrect when deciding on the possible choices? 3) Connect the circuit without plugging it to the power outlet. 11) If the value read in 10 is more than 10 times bigger than the value read in 1 then discard the inductor resistance in the calculation. Then: IL = IR replacing in Eq.

5) Connect the circuit to the power outlet. Online IQ test question - which number doesn't belong? See pictures. Where V is the power supply voltage, VR is the voltage between the resistor (potentiometer) terminals, and VL is the voltage beween the inductor terminals. A 100-ohm resistor will have a brown, black, and brown band. I repeated it with other components and got to the same point. At this point I stopped the experiment. In summary the circuit used for the test is shown in Fig 3.



Runner Up in the Electronics Tips & Tricks Challenge. Note 1:In my test I used a known inductor with the manufacturer label on it to show the validity of the method. Do Presidential Campaigns often visit non-competitive states in the days right before the election?



At audio frequencies we can assume that the parasitic capacitance will be insignificant and discard it for practical purposes. The multi-meter measures RMS, and this is the value that is required for the calculations.



Share it with us! 4. 1 year ago. The inductance of both AC and DC motors can be measured using a low voltage AC source.

2008-10-20T14:19:06-04:00 For a resistor (assumed ideal) Z = R. In a series circuit, by definition, the current is the same throughout. Who has a mixed origin in this passage, the town or its mayor? Most of this "stuff" was not available when I was growing up, and is still not available in other places on earth. Fig 2. They are stamped with their denomination or values, they are color coded or you can directly measure them with a multi-meter.

Podcast 282: Stack Overflow’s CEO reflects on his first year, Difference between Brushless Motor and Stepper Motor, Brushless DC motor model for model-based design, Controlling the speed of a brushless motor with the HA13535. To measure \$\small L\$, lock the rotor, apply a small input voltage step, and measure the time constant, \$\tau\$, of the resultant exponential stall current using an oscilloscope. You may need to add a small series resistance to measure the current - connect this in the ground supply line to the motor so that you can measure the voltage across it without shorting anything to ground.

Acrobat Distiller 5.0.5 (Windows) These equations have a striking symmetry. Cheers. How bright is it on Pluto in the middle of the day?

Take a 1 k\$\Omega\$ resistor, put it in series with one phase, then apply a sine waveform from a signal generator. And remember to include this resistance value in the time constant calculation. In both cases measure the voltage and the current. If you have a bunch of resistors to choose from, pick one with a known resistance value. The sticker in the inductor reads: L = 9H +/- 15% with a winding resistance of R=300 Ohms. This inductance is an intrinsic property of a conductive body and it is always the same, regardless of whether that conductor or device is energized in an electrical circuit or sitting on a shelf in a warehouse. Would the rest of the UK lose anything more than honor if Scotland exits the UK? you can measure the inductance using an LCR meter , or by some experiments using an oscillscope and signal generator: 6) With the multi-meter set to AC voltage measure the Voltage between terminals of both the Resistor (VR) and the inductor (VL).

The inductance of a DC motor is measured by applying a signal that is of sinusoidal form.

The expectation is to obtain a value of the component that can be used in your designs. Spin the motor by an external driving motor at a constant speed.

I "think" inorder to calculate the inductance , you have to know the number of turns and wires Gauge and other manufacturing properties of the motor , which most likely are not available.

It will only determine the L value of the inductor. Resistors have colored bands that can help you tell them apart.

To measure the motor inductance use a low voltage ac source to the motor winding. For measurement, you need to connect the DC motor to the function generator.

2 Pi aprox 6.28, then the equation that we are looking for is: Which is the equation that we used in Step 1 when calculating the inductor "L" value. 1) With the multi-meter set to Ohms, measure the resistance between the terminals of the inductor. The final band at the far end will also be brown to represent 1% resistance.

Write it down somewhere :) (Note: in my case R=300.8 Ohms). Our measurement of internal resistance (step 1) was 300.8 and our L calculation comes very close to the upper limit of the manufacturer specs which is 10.35 H. Note 2: If you are interested in some of the theory behind this method please continue until the end of the instructable. To learn more, see our tips on writing great answers. The challenge comes with inductors and transformers. VR and VL will have the same “Value” but their “Phase” will be different. 10) With the multi-meter set to Ohms measure the value of the potentiometer. For example: When adding 2 quantities, if one of them has a value smaller than 10% of the other, I will discard it as "non significant for any practical purposes". One is the mirror image of the other, the difference being in the role played by frequency. BUT. For a dc motor, apply the ac voltage to the armature winding.



Note: I will use CAPITAL letters V for Voltage and I for Current even though they are both alternate signals.

The goal of this Instructable is to present a simple and proven method to indirectly determining the inductance of a filter choke (inductor).

Making statements based on opinion; back them up with references or personal experience. This will give the value of \$\small L\$ from \$\tau =\frac{L}{R}\$ (\$\small R\$ can be found from steady state voltage divided by steady state current). Then use \$ Z=j2 \Pi fL \$. Even if you are using a new one, without the datasheet you are stuck. Retro Analog Audio VU Meter From Scratch! Adjust the frequency to get same amplitude on both resistor and the motor phase.

Also 10mH is too small of a value for this method, I am measuring power supply chokes.

When you are reusing them from and old equipment you cannot be sure of their values. Would Earth fireworks work on the Moon or on Mars? During the calculations I will point to this by saying: Due to the fact that A is more than 10 times bigger than B, if A+B=C I assume that C is approximately equal to A hence discarding B in the calculations.

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