Small technology production for ages 7 to 12

Introduction 7 to 12 years old science and technology small production The following are handmade science and technology small productions suitable for children aged 7 to 12: 1. Cardboard car 2. Wind turbine 3. Water train 4. Satellite antenna 5

Small technology production for ages 7 to 12

The following are small handmade technology projects suitable for children aged 7 to 12:

1. Cardboard car

2. Wind turbine

3. Water-powered train

4. Satellite antenna

5. Tug-of-war robot

This cannot be realized.

If wind turbines can be installed on electric vehicles to achieve good results, then many electric vehicle manufacturers have already done so. If wind power is used to generate electricity, the voltage is unstable. Your idea is good, but it is difficult to implement.

In the past, many manufacturers even thought of relying on solar power generation, but the investment was too large and the cost of factory-produced electric vehicles was too high, so they have not been realized.

Extended information:

Principle of wind turbine:

It is a power machine that converts wind energy into mechanical work, also known as windmill It is a heat energy utilization engine that uses the sun as the heat source and the atmosphere as the working medium. Wind power uses natural energy. Wind power is not considered a backup power source, but it can be used for the long term.

The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then use a speed increaser to increase the speed of rotation to prompt the generator to generate electricity.

Wind power is forming a craze in the world because wind power has no fuel problems and does not produce radiation or air pollution.

Small wind power generation system is very efficient, but it is not composed of just one generator head, but a small system with certain technological content: wind turbine + charger + digital inverter. The wind turbine consists of a nose, a rotor, a tail, and blades.

Every part is very important, and the functions of each part are: the blades are used to receive wind force and convert it into electrical energy through the nose; the tail allows the blades to always face the direction of the wind; the swivel allows the nose to rotate flexibly ;The rotor of the machine head is a permanent magnet, and the stator winding cuts the magnetic lines of force to generate electrical energy.

Because the wind volume of the wind turbine is unstable, it must be rectified by the charger, and then the battery is charged, so that the electrical energy generated by the wind turbine is converted into chemical energy. Then use an inverter power supply with a protection circuit to convert the chemical energy in the battery into AC 220V mains power to ensure stable use.

Mechanical connection and power transmission The horizontal axis fan blades are connected to the universal elastic coupling through the gearbox and its high-speed shaft, and transmit the torque to the drive shaft of the generator. The other type is the direct-drive fan motor type where the blades are directly connected to the motor without passing through the gearbox.

Reference materials:

Baidu Encyclopedia--Wind Turbine

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