Microwave Motor Crank Charger

Introduction: Microwave Motor Crank Charger

About: DIY my way through life. For me, Instructales is a way of living. It's my making log. My life is counted with the instructables I make.

I had an old Microwave Oven and decided to salvage all useful stuff from it .

It had powerful magnets, limit switches , temperature switches , heaters , motors , fans , screws , piezoelectric tweeters and lots of wires and connectors.

My favorite and best thing I 've got from it is the turntable motor.

I found that this motor is a powerful generator so I decided to make a Mobile Phone Crank Charger with it.

This motor is the unknown soldier in the Microwave oven that slowly turns the big glass plate inside the oven and over it all your food and stuff gets the waves and heat from all sides.

You can find many instructables and websites talking about safety precaution before opening the Microwave Oven.

Here I will show you my experiment with the turntable motor. I got it from an old microwave oven, but you can get it from Amazon or eBay or Banggood , Aliexpress.

Here is my Channel on Youtube:

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Step 1: Technical Background

The Microwave Turntable Motor can be a powerful generator if you could turn its rotor.

Actually , if you could turn the rotor by your hands while touching the Motor terminals you will get a painful ELECTRIC SHOCK ...... SERIOUSLY......

I have measured the induced voltage from the motor while cranking its knob and it outputs more than 400 Volts on AC Volt scale.

When I connect the output terminal to a Diode , it measures more than 200 Volts on the DC Scale.

But this voltage is not steady as it drops as soon as you move your hand turn the motor knob once again.

That large volt output compares to the small output current ( less than 20 mA ). It hardly lights an LED.

So what makes that motor a strong generator ?

I searched the web to see if it happened to any one else as it happened to me for the first time before I knew it.

I searched Google " Microwave motor electric shock " and I found a video showing a guy who opened the motor to know what makes it generate this electric shock.

The motor has a permanent magnet as a rotor and a thin Copper wire wound on a plastic reel as a stator.

Also , the rotor is coupled to some plastic set of gears to reduce the motor speed and increase its torque.

This motor is a high torque motor. It can rotate the big glass plate and on it all your food and dishes.

When you connect the motor to its nominal operating voltage supply ( 220 Volts ) it rotates at 6 rpm . Very slow so that no food gets spilled and all the contents get uniform heat distribution inside the oven.

Step 2: Material and Tools

The Microwave Motor

Metal Rod ( about 20 cm )

Pliers

Two Crocodile Clips

Standard ( 220 Volts input ) Mobile Phone Charger of any kind.

Note :

If you don't have an old Microwave oven and still want to get this motor to try it for yourself, you can buy a new one from here Amazon, eBay or Banggood.

Step 3: Making the Crank Rod

Using the Pliers, fold the metallic rod so that it makes a hook to the motor knob.

Then fold the other end of it to grab it from this end.

Step 4: Crank Your Phone Charger

Now connect the motor with its crank connected to a couple of crocodile clips then connect them to a standard mobile phone 220 Volt charger at its input terminals.

Safety Precautions !!!!

-----------------------------------

Be careful not to touch either the motor , the charger or the crocodile clips terminals. You 'll get a bad electric shop.

It will not kill you but it is really painful and it hurts.

Now turn the motor using the crank rod while connected to the the phone charger and connected to the phone itself.

You can see that as you are cranking the motor the phone is charging.

Now you have a Mobile Crank Charger. This can be used to charge your phone in case of emergency without any external source of electricity. There are many similar products sold online.

Thank you for reading my instructable.

You can also find my book Learn By Making on Amazon website.

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13 Comments

0
maaik
maaik

7 weeks ago

I made this by placing the motor in an old extension socket box and made the handle from a hex key and paint roller. However when turning the phone does lot up but keeps connecting and disconnecting, so charge only a split second, then disconnect, then charge another split second and so on. It doesn"t matter how fast you spin the handle (just not too slow, but going faster doesn't stop the constant disconnecting). So I guess it is not putting out enough Amps? Can someone explain, and is there a way to make it work better?

IMG_20210730_101637_5.jpgIMG_20210730_102037_9.jpg
0
skywiredvt
skywiredvt

Reply 4 weeks ago

I tried something similar and experienced the same exact problem. I tried multiple devices, but I think, to your point, it has to do with the current the motor can supply. I think that the motor will start supplying power, and the device will start charging, once the device has started charging, it draws too much current causing the voltage to drop. When it stops charging, the motor can supply enough current again, and the cycle repeats. If you do discover a solution, do let me know!!!

I live in the US, so we have 120V intead of 220V

image.jpg
0
multilalo64
multilalo64

2 years ago

How would you wire this to charge a small capacitor? so it can deliver a fun little shock, like a diy shocking bubble gum prank

0
SamJ133
SamJ133

3 years ago

is there a way to increase the speed of this motor ? instead of 6rpm can one make it like 20rpm or anything faster ?

0
Yonatan24
Yonatan24

Reply 2 years ago

Nope.

0
mpd-7000
mpd-7000

6 years ago on Introduction

i wonder what would hapen if there was a thicker gage wire and a few N-52 neodymium magnets

0
ahmedebeed555
ahmedebeed555

Reply 4 years ago

I believe it would be much stronger.

0
ahmedebeed555
ahmedebeed555

Reply 4 years ago

You are welcome

0
-Pyroinventor-
-Pyroinventor-

5 years ago

You forgot to mention the lethal plasma arc generator MOT in the usefull parts section}:-}

0
sunilb6
sunilb6

6 years ago on Step 4

How long the motor will work?