モーター紹介動画A21

Summary

This video demonstrates how to easily create a simple motor using basic materials like an AA battery, enamel wire, paperclips, and a magnet. The process involves winding the wire into a coil, carefully sanding it, and assembling the components into a functional motor. The video also explains the motor's workings, emphasizing the role of electric current and magnetic fields in making the coil spin. With simple steps and materials, viewers can learn how to build their own motor while gaining insight into basic electrical principles.

Takeaways

• 😀 You can create a simple motor using easy-to-find materials like a battery, enamel wire, clips, a magnet, and tape.
• 😀 The motor-building process is simple and can be done with items commonly found at 100-yen stores.
• 😀 To make the coil, wrap enamel wire around a round object (like a pen or battery) about 30-40 times.
• 😀 Leave two wire ends about 2 cm long on both sides to create the coil’s connectors.
• 😀 One side of each wire end should be sanded to remove the enamel, while the other side is left untouched to ensure proper motor functioning.
• 😀 The paper clips act as a base to connect the battery and coil, allowing the motor to rotate.
• 😀 The neodymium magnet is placed at the center of the battery to generate the magnetic field that interacts with the coil.
• 😀 The interaction between the magnetic field and the electric current creates a force (Lorentz force) that makes the coil spin.
• 😀 The direction of current flow and the magnetic field are key elements that control the motor’s rotation.
• 😀 The motor's coil will reverse direction when the current changes, but sanding only one side of the wire helps prevent unwanted behavior during rotation.
• 😀 This motor-building project is a great way to learn about electromagnetism, electricity, and basic motor mechanics.

Q & A

What materials are needed to make the motor in the video?

The materials needed include a dry battery (either AA or AAA), enamel wire, sandpaper, a paper clip, a neodymium magnet, and tape. Most of these materials can be found at a 100 yen shop.

Why is enamel wire used in this motor project?

Enamel wire is used because it is coated with an insulating layer, which allows for the creation of coils. These coils are essential for generating the electromagnetic fields that will make the motor work.

What is the purpose of sanding the enamel wire?

Sanding the enamel wire is necessary to remove the enamel coating from one side of the wire. This allows electrical contact to be made when the wire is connected to the clip, while the other side remains insulated to control the current flow.

How much of the enamel wire should be left exposed after sanding?

About 2 cm of enamel wire should be left exposed on each side of the coil after sanding.

What role does the paper clip play in the motor?

The paper clip acts as a holder to connect the enamel wire to the battery. It serves as a supporting structure, ensuring the wire is positioned correctly to complete the circuit and allow the motor to turn.

What is the importance of leaving one side of the enamel wire's coating intact?

Leaving one side of the enamel wire's coating intact ensures that the coil can rotate freely without losing its momentum. If both sides were fully sanded, the coil would not rotate as effectively, as it would lose power too quickly.

What is the purpose of the neodymium magnet in this motor?

The neodymium magnet is placed at the center of the battery. It creates a magnetic field that interacts with the current flowing through the coil, generating the force that causes the coil to spin.

What is the key factor in making the motor spin?

The key factors are the direction of the electric current and the direction of the magnetic field. The interaction between the current and the magnetic field generates a force that causes the coil to rotate.

What is meant by the term 'magnetic field' in this context?

A magnetic field is the area around a magnet or an electric current where magnetic forces can be detected. In this motor, the field is created by the neodymium magnet and interacts with the current flowing through the coil.

How does the coil's direction change during operation?

As the coil rotates, the direction of the current flow changes, causing the magnetic field interaction to reverse and pushing the coil in the opposite direction. This allows the motor to keep spinning.