Hao Jie Chan's Kingdom
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built of paper.

Friday, April 29, 2016

Magnetic Levitation with Arduino

Hello guys! I posted my Magnetic Levitation project on Hackster.io! It is really a great site to share your own project!
Here is the link to my project: https://www.hackster.io/chanhj/magnetic-levitation-8c3ad0?ref=custom&ref_id=45065&offset=4

Magnetic Levitation

Even though I’ve posted some brief intro and instructions there, they are not very detailed. But then I am a lazy guy, so if you need more details, just leave a comment, maybe I can improve the post?
It's made with a U3503 Linear Hall Effect Sensor, a MOSFET and a LED. :D It is that simple.

Magnetic Levitation Circuitry

Magnetic Levitation Circuitry Interfaced with Arduino UNO

My code is copied directly from another guy listed in my hackster project. All credits go to him, I only edited the PID parameters. However, his code does not compensate for the field generated by the coil itself, maybe I can research more on that, keep planning... Less doing, all the time...

I have since then found another levitation project to make, it’s a rotating globe, with blinking LEDs! Who doesn’t love LEDs right? Until next time, keep making things! :D

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Tuesday, March 29, 2016

Experiment 8-AC Single Phase Induction Motors

I started to take photos of my Power Laboratory experiment for no reasons since my first lab work. Since many do not have the chance to actually operate an AC machine( even my electronics engineering course mates hahaha), ceiling fan and machine machine excluded, I think it’s a good idea I share the photos out.
My theory might not be perfect, so please correct me if you spot any mistake of any kind, I thank you in advance. ( But I wouldn’t go into too much theory though…)
My experiment is divided into Split-Phase motor, Capacitor-Start motor and Capacitor-Run motor. These are all induction motor, operating with a single phase supply. Thus we need to create another phase of supply to provide a rotating magnetic field to turn the rotor.
Capacitor-start motor
We used the capacitor-start motor without the capacitor, functioning as a split-phase motor. The auxiliary or the start winding has a high resistance and inductive reactance, while the main winding or the run winding has low resistance and high inductive reactance. Because of the different ratio of winding resistance to the inductive reactance, the run winding current  lags the start winding current, creating a phase difference between them. This creates fields that are out of phase, which in turn produces a rotating magnetic field in the stator. This develops torque in the rotor, starting the motor. ( And almost all of these are copied from my lab manual. Credits to whoever produced these sheets. )

The starting current of split-phase induction motor is 4 to 5 times of their full-load current, thus the starting period has to be short to prevent over heating. ( And I felt the heat after applying power for just 3 seconds!) A centrifugal switch will switch out the start winding ( which has high resistance and will overheat and burn out easily ) once the rotor reaches certain rpm.
Capacitor of capacitor-start motor
A big ass capacitor of the capacitor start motor.
The construction of the motor
Showing the auxiliary winding ( the thinner wire) and the main winding ( the thicker wire).
Closer shot of the windings and also observe the clearance of the stator and the rotor.

The operation of a capacitor-start motor is pretty similar to a split-phase motor. Now we connect the capacitor in series with the auxiliary winding. This provides a rotating magnetic field as well. The cap and winding are disconnected with a centrifugal switch as well.
This is the full setup, including ammeter, voltmeter, wattmeter and electrodynamometer.
Another type of capacitor, mounted for capacitor-run motor.

The capacitor in capacitor-run motor is always connected to the auxiliary winding and power. It doesn’t get disconnected with centrifugal switch. The manual states that it’ll be more quiet at full load, but honestly I didn’t feel the difference. Still vibrating like no body’s business!

Determining the starting torque
Posted by Chan Hao Jie on Monday, March 28, 2016

This video was taken to find out the starting torque. The scale was too fast for my slow eyes! :(

Measuring the starting current.

Posted by Chan Hao Jie on Monday, March 28, 2016

Another one for measuring starting current.
I would slowly update this blog with my previous and next experiment. Other than Power Lab, I have Advanced Power Electronics Lab as well, dealing with thyristors! Stay tuned. :D
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Saturday, March 12, 2016

Feedly- My Daily Newsletter

Logo from Feedly website

I have been using this for over one whole year now. I think this is a very useful tool so I want to share this out.
feedly GUI
Feedly main screen, captured from the website introduction page

Feedly is a subscription tool. It is like a newspaper service, but it operates online. You choose whichever journals, articles or even YouTube channel you like, Feedly will collect their updates and arrange them nicely in your Feedly homepage.

Using Feedly is simple, just go over to the website, register and login, subscribe to your favourite sites so you would not miss any of the updates. So you can subscribe to my blog too if you want!

The biggest challenge for me before using Feedly is that I have too many websites to keep track of. And you would not have all the time to keep refreshing the website to check the updates. And e-mails are quite annoying for me. I used Google Reader before it is gone, then I found Feedly. My subscription ranges from Electronics and Arduino stuffs, to homebrew comical videos and Japanese lesson.

So, use it now to help in your reading. I call mine a One-Stop Reading Corner in this distracting world of Internet.

P/S I am not in anyway affiliated with Feedly. But it would be nice to give me like a one month premium service maybe? Haha.
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Sunday, February 07, 2016

Happy Chinese New Year

It’s almost New Year here in Malaysia. My Strike Freedom is still in building process. So I did some photo shooting with a “ang bao” (red packet).
Strike Freedom with ang bao
Strike Freedom is still my favourite Gundam until today. Maybe it’s because it is the first model I ever watched? Nothing beats childhood memories I suppose.
This is my sister’s calligraphy writing for Chinese New Year. She got the first prize for a contest in her school with this writing. Sure, it needs some polishing, but at least it’s better than mine.

So, happy Chinese New Year everyone! Wish you guys have a wonderful and prosperous year ahead!
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