LED lights have a series of characteristics such as obvious power saving effect, long service life, no radiation, no stroboscopic effect, no noise, soft light, wide operating voltage range, etc., which are increasingly popular with consumers.
As a consumer, how to choose the products you are satisfied with from the dazzling array of LED lamps? How to judge whether the lamp is qualified? The Ningbo Electric Security Inspection Center (Yuyao Laboratory) supports everyone and can be identified from the following aspects.
One is packaging and trademarks. The state mandates that LED lamp manufacturers mark the following on the product packaging: rated voltage, voltage range, rated power, rated frequency. Generally speaking, the trademark printing quality of high-quality products is good, the logo is legible, and it is not easy to wipe off with a soft damp cloth, and there are trademarks of manufacturers and related certification marks.
The second is the appearance of the lamp. There should be no signs of cracks, looseness and prying between interfaces. During the installation and disassembly, the lamp head should not be loose or tilted. The plastic shell of the lamp must choose the kind of engineering plastic flame retardant, which is characterized by the surface having a texture similar to frosted glass. The ordinary plastic surface is smooth and shiny, but it is easily deformed and flammable, and it is prohibited to be used in the production of energy-saving lamps.
The third is the working state. Under normal working conditions, the temperature rise of LED lamps should be relatively low. If the heat dissipation conditions are not good and the lamp beads work at high temperatures, the light attenuation will be very large and the life of the lamps will be greatly reduced. At the same time, if the lamp flashes quickly when it is turned on and off, it also indicates that there is a quality problem.
The fourth is working sound. Electromagnetic compatibility is an item that electrical appliances must pass. The sign of national electromagnetic compatibility test must be printed on the packaging of LED lighting products. We can also make a simple judgment through a small test. Bring a medium and short wave radio. When the lamp is working, place the radio nearby. The lower the noise the radio receives, the better the electromagnetic compatibility of the lamp under test. Listen to the sound of LED lamps working in a quiet environment. If you can hear the sound of lamps working very clearly, it means that the power supply of the lamps is not very good.
As a majority of consumers who do not have electrical knowledge, how to quickly, simply and effectively buy LED products that meet their needs, you can roughly focus on the following two indicators.
One is power and comprehensive light efficiency. The comprehensive luminous efficiency of LED lamps refers to the luminous efficiency of a product LED lamp, the unit is lumens / watt. The higher the value, the better the energy-saving effect of the lamp, and the more power-saving it should be. LED lamps with high lumen / watt should be selected. According to the use environment, choose LED lamps of suitable power size. With regard to the LED lamps currently on the market, 16-watt LED lamps can achieve the luminous flux equivalent to 200-watt incandescent lamps, which is enough to meet the lighting requirements of 10 square meters of space. .
The second is the color rendering index and color temperature. The color rendering index is an indicator to evaluate the color rendering ability of the light source to the object. The color rendering index of the perfect reference light source is 100. The higher the color rendering index, the closer the color response of the light source to the object is to the true color. It is generally believed that: 80-100, excellent color rendering; 50-79, general color rendering; less than 50 is considered poor color rendering. The unit of color temperature is Kelvin (K), the color temperature of red light source is between 800K and 900K, the color temperature of yellow and white light source is about 3,000K, the color temperature of white light source is about 5500K, and the color temperature of light blue light source is between 8,000K and 12,000K between. The color temperature of the light source is selected according to personal preferences. For example, if someone likes warm-colored lamps, he can choose lamps with a color temperature of about 3,000K.
The fixed and rotor iron cores of large motors are divided into many overlapping segments. The punch plate of spot welded ventilation channel steel is placed between the iron core segments, namely, the ventilation groove plate, so as to form the radial air duct of fixed and rotor iron cores, which is used for heat dissipation and ventilation cooling of iron cores. The manufacturing quality of the ventilation groove plate must meet the strength requirements to ensure that no collapse or collapse occurs after loading. At the same time, the spot welding position of the ventilation channel steel on the punching plate should be accurate. After each section of iron core is pressed, the axial position of the ventilation channel steel should be in a straight line to ensure that the radial air duct does not distort and the axial straight line transmission of the pressing force of the iron core.
With the development of motor manufacturing technology and upgrading of manufacturing equipment, the manufacturing technology level of ventilation groove plate has been greatly improved. Currently supported processes are resistance welding and laser welding. Resistance welding is to place the welding parts between two electrodes, connect the current and apply a certain pressure, use the resistance heat generated when the current flows through the workpiece contact surface for heating, forming the local melting state of the welding parts. Laser welding is a kind of laser beam with high monochrome, strong aroma and high brightness by using the principle of excited atomic radiation. The laser beam, which is composed of coherent monochromatic photon stream with high energy density produced by laser, is used as energy source to bombard metal or non-metal, generate heat and melt it to achieve the purpose of welding.
According to the different requirements of the structure design and the characteristics of the respective spot welding process and the actual production needs, the motor manufacturers can
According to their own design capacity, equipment situation, production cycle, choose suitable for their own ventilation groove plate spot welding process, to ensure the manufacturing quality of ventilation groove plate.
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