Introduction

This electric motor is made in reference and inspired by Roobert33's "How to make an electric motor homemade" YouTube video.

This was made for a physics coursework. Although the video has already briefly explained how it works and made, here's my take. Or rather an improved version.

Suggestions

Revising on how a DC motor works and Flemming's left hand rule for motors may help.

If the embed video of this motor doesn't work, click here

Happy Building- CCX

Step 1: Materials

Materials used:

● MDF

● Board pins

● 30SWG enameled wire

● Wooden dowel

● 2 ball bearing

● Some plywood

● 2 Banana socket (black and red)

● 1 speaker magnet

● Screws

● 2 L bracket

Step 2: The Rotor's Frame

This is the main section of the motor.

Cut out two circles of MDF with a diameter of 100mm x 3mm. with a central hole of 10mm.

The MDF can be substituted by some other material like acrylic

Attach 8 board pins evenly around the circle for the coiling after on, make two of these totaling of 16 board pins.

Combine two of the circles with a wooden dowel of 200mm x 10mm with a maximum distance between both of 120mm

Painting it or not is just for aesthetic purposes.

Step 3: Coiling

Probably the best part of the entire project, coiling.

The coils are shaped rectangular, lapped on the board pins.

It consist of 4 coils of 30SWG enamelled wire coiled with 160 laps on 4 board pins.

I suggest on either taping it or zip tying it so that the fragile wires will not tangle or come loose and also hot glueing the coils to the board pins and circle.

Step 4: Making the Commutator

The commutator is the segment where the electrical current contacts and flow through.

The commutator is made out of 8 plates of copper 15-20mm x 0.4 mm. bent in a curve with a quarter circumference of the wooden dowel. The plates of copper are to be glued over the wooden dowel with the hot glue.

Make sure that the copper plates DO NOT TOUCH EACH OTHER.

The ends of the wires from the coils are soldered on the sides of the plates of copper as seen on the picture attached, adding flux would make the soldering easier.

I just realised I did not take pictures of this segment, sorry for the lack of images. Here's a drawing on how it's wired to supplement that.

Step 5: Completing the Rotor

Add ball bearings of 26 x 8 x 10 mm on both ends of the dowel.

As seen on the second picture, the ball bearing has some EVA foam sticked around the ball bearing to reduce vibrations and noise.

Once your rotor is done time to make the motor frame.

Step 6: The Motor Frame

A plywood base with two stands on both end supported with screws and an L bracket.

A speaker magnet is then glued on the centre of the base.

To give it a much nicer look and allow it to stay on surfaces, I attached an EVA foam cut out sticked on the base with some double sided tape

Step 7: The Holder of the Rotor

Two plywood of a "V" shape is cutted out to support the rotors ball bearing.

A spring is added on both side to stabilise the rotor from leaning to one side and shaking violently.

A small dowel is also added on the top on both side using screws to secure the rotor in place as seen in the fourth picture.

Step 8: Commutator Contact Points

A custom made metal plate touches the copper plates (commutator) on both ends with a Pencil lead as a contact point, as it is much smoother for the coil to rotate or rather conduct. Less noise too! The metal plates on both sides are different varying from the way you wired it.

Two banana sockets are attached to the motor frame and contacts the metal plate via the screw.