LED thermal management technologies include thermal management of chips, packaging, and system integration. On the chip side, people strive to improve the crystal quality of the material or design a new structure to improve the internal and external quantum efficiency of the chip itself, which is smaller than the conventional low thermal conductivity sapphire substrate chip.
Chip (quantum efficiency; power density; heat flow expansion; substrate material, etc.)
LED thermal management package (package material; package structure; packaging process, etc.)
System integration (refrigeration technology; materials; processes, etc.)
LED heat dissipation structure description (illustration path: use illustration \ LED heat dissipation structure description)
1. The necessity of LED heat dissipation (heat dissipation is the technical bottleneck of current semiconductor lighting technology)
LED is a photoelectric device. In the working process, only 10% to 40% of the electrical energy is converted into light energy, and the rest of the electrical energy is almost converted into thermal energy, so that the temperature of the LED rises. LED temperature rise is the main cause of LED performance degradation and failure. The LED junction temperature rises, resulting in reduced luminous efficiency, poor reliability, reduced service life, and increased heat generation.
2, the solution
LED thermal management overview
(A) Improve the structure and materials of LED chips and packages - the upper and middle reaches of the industry to complete (B) system integration, mainly for the heat dissipation of the lamps, improve the heat transfer power - the work of heat dissipation design
3, LED lamp heat dissipation structure analysis chip (node â€‹â€‹temperature control at <85 Â° C) - (heat resistance is small products are conducive to heat dissipation) - lamp bead substrate - aluminum substrate (increasing copper area is conducive to heat conduction) - (using heat conduction Silicone) - Radiator housing light (good structure for air convection) - surroundings
Electric dc motors were the first type widely used, since they could be powered from existing direct-current lighting power distribution systems. A electric 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 electric dc motor 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 electric dc motor are used in propulsion of electric vehicles, elevator and hoists, or in drives for steel rolling mills.
Areas of application: the Electric Dc Motor rotor part of the armature iron core, armature, commutator, such as equipment, electric dc motor is suitable for most electronic products, such as electric screwdriver, laser, smart home, gas valve, etc
Method of use: the best stable in horizontal plane, installed on theelectric dc motor output shaft parts, cannot use a hammer to knock, knock prone to press into the electric dc motor drive, may cause damage to internal components, and cannot be used in the case of blocked.
Operating temperature range:
Electric dc motor should be used at a temperature of -10~60â„ƒ.
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 (approximately20~25â„ƒ.
If a electric dc 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:
Electric dc motor should be stored ta a temperature of -15~65â„ƒ.
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.
The longevity of geared motors 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—Momentary reversals of turning direction
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.
Electric Dc Motor
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