For the understanding of engines, we may all know that there are DC generators and alternators. These two types of motors have appeared a long time ago, and the appearance of such motors has greatly improved our industrialization process, and the three As a kind of AC motor, phase asynchronous motor has been greatly developed because of many advantages. It has many advantages over other types of motors, such as price, practicality, operation guarantee, etc. There are three The advantages of the phase asynchronous motor are reflected, so the three-phase asynchronous motor has been widely used in many aspects. Three-phase asynchronous motors are divided into small-capacity and large-capacity, and the small-capacity motor can use the direct start method when starting, while the large-capacity motor can use the more advanced step-down starting method. The step-down start is also divided into reactance step-down start or stator series resistance start, auto-transformer step-down start and YD step-down start. In the process of starting, the current will decrease as the voltage decreases, and the starting torque will decrease with the square coefficient of the voltage, which is usually suitable for lighter starting. In normal operation, the starting method of YD can be used. This starting method can quickly reduce the current and torque to 1/3 of the original. When starting large capacity, the starting method of autotransformer can be used, which is to directly reduce the torque to the original 1/k2. Before the three-phase asynchronous motor is powered on, the rotor is stationary. When the stator winding of the motor is connected to the three-phase power supply, a rotating magnetic field is generated in the air gap in the stator. Assuming that the rotating magnetic field rotates in a clockwise direction, there will be relative motion between the rotor and the rotating magnetic field, and an induced electromotive force will be generated in the rotor wire. Since the magnetic field rotates in a clockwise direction, which is equivalent to the magnetic field not moving, the rotor wire moves counterclockwise to cut the magnetic field lines. According to the right-hand rule, it can be determined that the direction of the induced electromotive force of the upper half wire of the rotor is outward, and the direction of the lower half wire is outward. The direction of the induced electromotive force is inward. Since the rotor winding is closed, under the action of induced electromotive force, an induced current flows through the rotor wire, which is called rotor current. The rotor current is subjected to electromagnetic force in the rotating magnetic field, and its direction is determined by the left-hand rule. These electromagnetic forces form a torque (called electromagnetic torque) on the rotating shaft, and its action direction is consistent with the direction of the rotating magnetic field, so the rotor rotates in the direction of the rotating magnetic field. Applications of various common three-phase asynchronous motors: The full name of Y series is fully enclosed self-fan-cooled three-phase squirrel-cage asynchronous motor. The use is very common, and it is used in general machinery and equipment without special requirements, such as agricultural machinery, food machinery, fans, pumps, machine tools, mixers, air compressors, etc. YS series three-phase asynchronous motors have low power and are suitable for driving small machine tools, pumps and compressors. The junction boxes are all on the top of the motor. YSF and YT series are not very different. They are all three-phase asynchronous motors dedicated to fans. They are based on the supporting requirements of the fan industry. A series of noise reduction and vibration reduction measures have been adopted in the structure. This series of motors has the characteristics of high efficiency and energy saving, low noise, good starting performance, reliable operation, and convenient use and installation. It is suitable for fan installation and use, and is an ideal accessory product for fans. YD is a multi-speed three-phase asynchronous motor (two-speed), which is mainly used in various transmission machinery such as machine tools, mining, metallurgy, textile, printing and dyeing, chemical and other industries that require step-by-step speed regulation according to the nature of the load. YL series is a dual-value capacitor single-phase asynchronous motor, that is, it has two capacitors, which can be used for mechanical equipment such as plastic machinery, agricultural machinery, food machinery, air compressors, water pumps and family workshops as power. It is especially suitable for occasions with only single-phase power supply. YC series is a single-phase capacitor start asynchronous motor YY series is a single-phase capacitor running asynchronous motor The SG series is a three-phase asynchronous motor with high protection level, which can be interchanged with the Y series, but the performance has been enhanced (such as the adjustment and optimization of the electromagnetic scheme, and some specifications use cold-rolled silicon steel sheets, etc.), which makes the vibration and noise of this series of motors. (especially the load noise) is significantly lower than the Y series motor. Experiments show that the noise of this series of motors reaches the I-level standard, and the vibration value of the motor is one priority lower than the Y-series standard. An oil injection device is added to the shaft extension end bearing, and the oil can be changed without disassembling the motor, and the maintenance is simple. YCT series is an electromagnetic speed-regulating motor, which is a speed-regulating motor that adjusts the torque and speed of the output shaft by changing the magnitude of the excitation current. It can be used for speed regulation and tension control of constant torque load, and is more suitable for blower and pump loads. For loads with high starting torque and large inertia, it has the function of buffering starting, and at the same time, it has protective functions such as preventing overload. YVP series is a three-phase asynchronous motor with variable frequency and speed regulation, which is a three-phase asynchronous motor with variable frequency and speed regulation as the power supply. By changing the frequency of the power supply, the speed of the motor can be smoothly adjusted to achieve the purpose of energy saving and control automation. YP2 series motors have high efficiency, wide speed regulation range, stable operation, convenient operation and maintenance, and their installation dimensions conform to the International Electrotechnical Commission (IEC) standard, and are divided into two types: self-fan cooling and external fan cooling. Poly Solar Panel,Solar Panel Module,Polycrystalline Solar Panel,Poly Crystal Solar Panels Wuxi Sunket New Energy Technology Co.,Ltd , https://www.sunketsolar.com