What Are the Different Types of Power Tools?
In 1895, FEIN manufactured the world's first DC electric drill. The shell is made of cast iron and can drill 4mm holes in the steel plate. Subsequently, a three-phase power frequency (50Hz) electric drill appeared, but the motor speed failed to exceed 3000r / min. In 1914, single-phase series-excited motor-driven electric tools appeared, and the speed of the motor reached more than 10,000 r / min. In 1927, an intermediate frequency electric tool with a power supply frequency of 150 to 200 Hz appeared. It not only has the advantages of high speed of single-phase series motors but also has the advantages of simple and reliable structure of three-phase industrial frequency motors. Use is restricted.
- In the 1960s, with the development of battery manufacturing technology, there were battery-less electric tools using nickel-cadmium batteries as power sources. But at that time it was slow due to its high price. By the mid-to-late 1970s, due to lower battery prices and shorter charging times, such power tools were widely used in Europe, America, and Japan. Power tools were originally used
- According to the statistics of " China's Power Tool Industry Production and Sales Demand Forecast and Transformation and Upgrade Analysis Report " statistics, power tools are mainly divided into metal cutting power tools, grinding power tools, assembly power tools and railway power tools.
- Qualified certification refers to the activity that proves that a product or a service meets specific standards or technical conditions with a certificate of conformity or a mark of conformity.
- "Certification" in 2013 has received widespread attention at home and abroad. During the entire process of product design, manufacturing, testing, sales, and use, companies increasingly feel the need for third-party help to ensure that manufactured products meet recognized quality standards, enable products to enter domestic and foreign markets, and improve product Reputation.
- Internationally, many countries have established certification systems and certification marks.
- My country was established in 1985 "
- electrical tools
- The electric hydraulic oil pump is a power tool.
- Pay attention to the purchase of power tools: First, a power tool is a motor or
- The use of hand-held power tools for electricians is harsh, and they must move constantly, have large vibrations and high noise during use. The power cord is easily damaged by external forces such as dragging, friction, or mechanical damage, which can damage the insulation strength and cause personal injury or death. To prevent accidents, hand-held power tools should be selected properly.
- Motors can be divided into DC motors and AC motors due to different input currents:
(1) DC motor -a motor that uses DC current to rotate is called a DC motor. Because the magnetic circuit and the armature circuit are connected in different ways, they can be divided into series-excited motors, divided-excitation motors, and complex-excitation motors;
- (2) AC motor -an induction motor in an AC motor. Its strong induction current (eddy current) is generated in a rotating magnetic field. The copper rod on the rotor continuously cuts the magnetic field lines. According to Lenz's law, this induction current has a magnetic field resistance. The effect of relative motion with the rotor, so the rotor rotates with the magnetic field. However, the rotation speed of this rotor is not as high as that of magnetic field transformation, otherwise the magnetic lines of force will not be cut by the copper rod.
- The electric motor that rotates with AC current is called AC motor. There are many types, including:
- a. Rectifier motor It uses a series-excited DC generator as an AC motor, which is the type of motor. Because the AC power is turned in the magnetic field and the armature circuit at the same time, the direction of the moment of the torque is kept constant. Keep turning. This type of motor is also called a "universal motor" because it can use both AC and DC. Vacuum cleaners, sewing machines, and other household appliances are commonly used in such motors.
b. Induction motor -a device that puts the rotor in a rotating magnetic field and causes the rotor to rotate due to the effect of eddy current. The rotating magnetic field is not caused by mechanical methods. Instead, the alternating current is applied to several pairs of electromagnets to cyclically change the magnetic pole properties. It can be regarded as a rotating magnetic field. Usually use three-phase induction motors (with three pairs of magnetic poles). The motion of a DC motor is exactly the opposite of a DC generator. In a generator, the induced current is formed by the induced electromotive force, so they are in the same direction. In the motor, the direction of the induced electromotive force supplied by the external power source is opposite to the direction of the armature current I.
c. Synchronous motor -a motor whose armature turns from one pole to the next pole, just the same cycle as the current turning. This type of motor cannot start by itself, and another motor or special auxiliary winding must be used to reach the appropriate frequency before AC power can be switched on. If the load changes and the rotation speed is changed, the rotation speed does not match the frequency of the alternating current, which makes the pace disorder, and tends to stop or cause damage. Due to many restrictions, it is not widely used. [1]
- 1.Single-phase power cables for mobile electric machinery and hand-held power tools must use three-core soft
- A mechanized tool that uses a motor or an electromagnet as the driving force to drive the working head through a transmission mechanism is called a power tool. It is a tool that is held by a hand and is driven by a low-power electric motor or an electromagnet through a transmission mechanism.
- In 1895, Germany produced the world's first DC electric drill. The shell is made of cast iron and can drill 4mm holes in the steel plate. Subsequently, a three-phase power frequency (50Hz) electric drill appeared, but the motor speed failed to exceed 3000r / min.
- In 1914, a single-phase series-excited motor-driven electric tool appeared, and the motor speed reached more than 10,000 r / min.
- In 1927, an intermediate frequency electric tool with a power supply frequency of 150 to 200 Hz appeared. It not only has the advantages of high speed of single-phase series motors, but also has the advantages of simple and reliable structure of three-phase industrial frequency motors. Use is restricted. Common electric tools are electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and impact drills, concrete vibrators, electric planers. [1]
- In 1895, the German Fein company developed the world's first electric tool, a DC electric drill, and began the era of human use of electric tools. In the past 100 years, electric tools have developed from few to many, from elementary to advanced, and have now formed three major product series for industrial, maintenance and household use, with hundreds of varieties and thousands of specifications, with an annual output of over 8 million And become an indispensable tool for human labor. Especially in the past two decades, with the rapid development of electronic technology, various electronic control technologies have been widely used in national electric tools, which not only improves the performance of the tool itself, but also improves the processing quality, flexibility of use, and product addition. Value, pushing electric tools to a new stage of mechatronics development. [1]
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