The world's smallest motor?

Come out! Come with me to get to know it!

? Scientists made it from carbon nanotubes. Its diameter is about 500 nanometers, which is 300 times smaller than hair

Come out! Come with me to get to know it!

? Scientists made it from carbon nanotubes. Its diameter is about 500 nanometers, which is 300 times smaller than hair, and it can be driven by voltage.

Nanomotors were designed by scientists at the University of California, Berkeley. Alex Czeitler, a researcher at the school, reported in the British journal Nature published on 24th that the rotating blade of the motor is a gold leaf, less than 300 nanometers in length, and the blade is installed on the rotating shaft made of multi-layer carbon nanotubes.

Multi-layer carbon nanotubes are sleeved by a plurality of hollow circular tubes with different diameters, and electrodes made of silicon dioxide are installed at both ends, which are fixed on the silicon wafer, and the other three electrodes are arranged around the carbon nanotubes. When a voltage is applied between the carbon nanotube and one of the electrodes, it can drive the gold blade to rotate. If the voltage is higher, the outermost carbon nanotubes will be separated from the inner layer, making the rotation of the gold blade more flexible. Constant voltage can keep the blade in a fixed position, while periodic voltage can make it rotate at a certain speed.

Previously, some scientists have developed a variety of micro-nano motors, but some of them are large in size and some need laser or magnetic drive, so the operation is not as flexible and convenient as it is. This kind of nano-motor is easy to drive, flexible to move, relaxed in temperature and chemical conditions, and even can run in vacuum, so it has great application potential, such as manipulating optical signals with gold blades as mirrors, or detecting chemical substances through the rotation speed of blades.

Related information:

Motor [motor; Electrically operated; Motor-driven; Electric] A rotating machine that converts electrical energy into mechanical energy. It mainly includes electromagnet winding or distributed stator winding and rotating armature or rotor for generating magnetic field. The current passes through the wire and is rotated by the magnetic field. Some types of these machines can be used as motors or generators.

Motor * * * Motor * * is a device that converts electrical energy into mechanical energy. It is made by using the phenomenon that the electrified coil is forced to rotate in the magnetic field and distributed to all users. According to different power sources, motors are divided into DC motors and AC motors. The motors in power system are mostly AC motors, which can be synchronous motors or asynchronous motors. * * * The stator magnetic field and the rotor speed are not synchronous. The motor is mainly composed of stator and rotor. The direction of the forced movement of the live wire in the magnetic field is related to the direction of the current and the direction of the magnetic field of the magnetic induction wire. The working principle of the motor is that the magnetic field acts on the current to make the motor rotate.

This is a machine that converts electric energy into mechanical energy. Usually, the working part of the motor rotates, which is called rotor motor; There is also linear motion, called linear motor. The motor can provide a wide range of power from milliwatts to ten thousand kilowatts. The motor is very convenient to use and control, and has the ability of self-starting, accelerating, braking, reversing and braking, which can meet various implementation requirements; The motor has high working efficiency, no smoke, no smell, no environmental pollution and low noise. Because one of it

Series of advantages, so it is widely used in industrial and agricultural production, transportation, national defense, commercial and household appliances, medical appliances and so on.

The most widely used motor is AC asynchronous motor, also known as induction motor. It is convenient to use, reliable to execute, low in price and firm in structure, but it has low power factor and is difficult to adjust speed. Large capacity low speed power machine commonly used synchronous motor * * * See synchronous motor * * *. Synchronous motor not only has high power factor, but also its speed has nothing to do with load and only depends on grid frequency. The work is relatively stable. DC motors are often used in situations where large-scale speed regulation is needed. However, it has a commutator, which is complex in structure, expensive and difficult to maintain, and is not suitable for harsh environment. Since 1970s, with the development of power electronics technology, AC motor speed regulation technology has gradually matured, and the price of devices has been continuously reduced, which has been applied. The maximum output mechanical power that the motor can bear under the specified working system * * * continuous, short-time execution system and intermittent periodic execution system * * * is called its rated power. Please pay attention to the regulations on the nameplate when using. When the motor is running, attention should be paid to matching its load characteristics with those of the motor to avoid overspeed or stall. There are many methods of motor speed regulation, which can meet the requirements of different production machinery speed changes. Generally speaking, the output power of the motor will change with the change of speed when it is adjusted. From the perspective of energy consumption, speed regulation can be roughly divided into two types: ① keeping the input power unchanged. The speed of the motor can be adjusted by changing the energy consumption of the speed regulating device and adjusting the output power. ② Control the input power of the motor to adjust the speed of the motor.