Now, a materials company is working hard to add new methods to these cooling measures. This company is the Xicun pottery industry that develops ceramic materials. The company's proposed cooling measures are based on the high thermal emissivity of ceramic circuit boards.
The chief member of the Thermal Design Laboratory, director of the Thermal Design Laboratory, said that the heat transmission method has three forms: “heat conductionâ€, “convection†and “thermal radiationâ€. The propagation of lattice vibration and the movement of free electrons in the metal belong to “ Heat conduction", fluid motion heat transfer belongs to "convection", and heat transfer through electromagnetic waves is "thermal radiation". The method developed by Nishimura Ceramics is to use the infrared radiation of ceramic materials to dissipate heat.
The heat radiation heat dissipation method has the advantage that heat can be released when the casing is sealed and thin, and heat cannot be transferred by convection. Some technicians have known this advantage for a long time, but there are very few precedents for full use. However, according to Nishimura Ceramics, LED lighting products that have recently used heat radiation have increased. Among them, a Japanese lighting appliance company applied it to various applications ranging from large-scale LED lighting fixtures such as light projectors to small lamps such as desk lamps.
By using heat radiation to dissipate heat, the heat dissipation efficiency of the emitter can be improved without using a cooling fan. The use of a cooling fan eliminates the risk of failure (the risk of the fan being unable to dissipate due to some kind of failure), and because there is no need for multiple fins, it does not accumulate dust, eliminating the need for cleaning. In the manufacture of the desk lamp, the ultra-thin design of the outer casing near the light source is successfully realized by using heat radiation to dissipate heat.
Interestingly, whether it is a large-scale product or a small product, Nishimura Ceramics provides the same ceramic circuit board to lighting equipment companies. The ceramic circuit board is a horizontally long hexagon with a length of 55 mm × a width of 30 mm and a thickness of about 6 mm. The multi-chip LED module is fixed to the circuit board by screws. High-power LED modules with a maximum power of 19W. Large products use multiple screws to secure the LED module to the ceramic circuit board, and one for small products. The material of the ceramic circuit board is alumina with a purity of 99.7%, and the heat radiation rate is 0.97. The surface is smooth, the average roughness is 0.5μm, and the LED module is directly fixed to the surface of the board by screws.
Compared with metal circuit boards and printed circuit boards, ceramic circuit boards are hindered by high cost. However, if the mass production effect can be improved by the generalization of the ceramic circuit board, the increase in the cost can be suppressed to some extent. This requires an increase in mass production, but as of now, mass production has not yet begun, because companies are jealous of the high cost of ceramic circuit boards.
In response to this situation, Nishimura said that after using ceramic circuit boards, the total cost of heat sinks such as circuit boards and heat sinks for mounting LED modules can be reduced, and it is planned to use such heat dissipation costs as a selling point. The reason why the company is so confident is that the lighting equipment companies that use the company's products have compared the ceramic circuit board products and the products with the traditional heat dissipation design, and considered the total cost, and chose the ceramic circuit board without exception. . Whether the idea of ​​compressing the total cost can be popularized, Xiaobian will pay close attention in the future. Perhaps, it is possible to predict the degree of popularity by whether the shape of the LED lighting fixture is increased.
After the above introduction, do you have a certain understanding of how to improve the heat dissipation performance of LED components?
A DC motor is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor.
DC motors were the first type widely used, since they could be powered from existing direct-current lighting power distribution systems. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight motor used for portable power tools and appliances. Larger DC motors are used in propulsion of electric vehicles, elevator and hoists, or in drives for steel rolling mills.
Dc motor areas of application: smart home field, robotics, precision medical equipment industry, automotive drive field, electronic products and personal care equipment
Application of the product:
Features: high torque, low noise, small volume, light weight, easy to use, running constant speed, etc., can also be matched with various gearboxes to change the output speed and torque.
Features: small volume, fast speed, stable performance, low price, good speed regulation.
Method of use: the best stable in horizontal plane, installed on the dc motor output shaft parts, cannot use a hammer to knock, knock prone to press into the dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
DC motor should be used at a temperature of -10~60℃.
The figures stated in the catalog specifications are based on use at ordinary room temperature catalog specifications re based on use at ordinary room temperature (approximately20~25℃.
If a geared motor is used outside the prescribed temperature range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.Depending on the temperature conditions ,it may be possible to deal with them by changing the grease of the motor's parts.Please feel free to consult with us about this.
Storage temperature range:
DC motor should be stored ta a temperature of -15~65℃.
In case of storage outside this range,the grease on the gearhead area will become unable to function normally and the motor will become unable to start.
Service life:
The longevity of DC motor is greatly affected by the load conditions , the mode of operation,the environment of use ,etc.Therefore,it is necessary to check the conditions under which the product will actually be used .The following conditions will have a negative effect on longevity.Please consult with us should any of them apply.â—Use with a load that exceeds the rated torque
â—Frequent starting
â—Momentary reversals of turning direction
â—Impact loads
â—Long-term continuous operation
â—Forced turning using the output shaft
â—Use in which the permitted overhang load or the permitted thrust load is exceeded
â—A pulse drive ,e.g.,a short break,counter electromotive force,PWM control
â—Use of a voltage that is nonstandard as regards the rated voltage
â—Use outside the prescribed temperature or relative-humidity range,or in a special environment.
â—Please consult with us about these or any other conditions of use that may apply,so that we can be sure that you select the most appropriate model.
when it come to volume production,we're a major player as well .each month,we rurn out 600000 units,all of which are compliant with the rohs directive.Have any questions or special needed, please contact us, we have the engineer group and best sales department to service to you Looking forward to your inquiry. Welcome to our factory.
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