Computer Air Filter
Converter principle – HC Network Electrical Industry – China medical air cushion by jekky
A basic knowledge 1 Overview States to use the AC power supply whether for family or for the factory its voltage and frequency are 200V 60Hz 50Hz or 100V 60Hz 50Hz and so on Typically the fixed voltage and frequency alternating current is transformed into variable AC voltage or frequency of a device called the quot inverter quot In order to produce variable voltage and frequency the device is first necessary to transform AC power to DC DC To direct current DC is transformed into alternating current AC of the device its scientific term for the quot inverter quot inverter As the inverter device voltage or frequency of change of the main device called quot inverter quot so the product itself is named quot inverter quot namely inverter inverter can also be used for home appliances Using the frequency converter products not only electrical appliances such as air conditioning etc as well as fluorescent lamps and other products Inverter for motor control not only can change the voltage they can change the frequency However the frequency converter for fluorescent lamps primarily for regulating the supply frequency Used car battery DC devices that produce AC also quot inverter quot to sell the name Converter works are widely used in various fields Computer power supply for example in the application the inverter for the inhibition of reverse voltage and frequency fluctuations and power of instant power 2 Why is the motor speed can be freely changed R min rotational speed of motor unit the number of rotation per minute it can be expressed as rpm For example 4 pole 60Hz 1 800 r min 4 pole 50Hz 1 500 r min motor speed proportional with the frequency Referred to in this article for the induction motor AC motor in industrial motors are used in most of this type of motor AC induction motor later referred to as motor similar to the rotation speed does depend on the motor pole number and frequency The working principle of the decision by the motor the motor pole number is fixed As the most value is not a continuous value for a multiple of 2 for example very few as 2 4 6 it does not and change the value to adjust the motor speed In addition the frequency of the electrical power supply of the electrical signal so the value can be adjusted after the outside of the motor electrical supply so the motor speed can be freely controlled Therefore to control for the purpose of the inverter frequency is preferred as the motor speed equipment device n 60f p n synchronous speed f power frequency p electrical poles changing the frequency and voltage is the best motor control If the only change in frequency the motor will be burned Especially when the frequency decreased the problem is very prominent In order to prevent the motor burning incidents change the frequency converter in the same time must also change the voltage for example to make the motor speed to half the inverter output frequency to be changed from 60Hz to 30Hz then the output inverter voltage must be changed from 200V to about 100V For example To make the motor speed halved the inverter output frequency to be changed from 60Hz to 30Hz then the inverter output voltage we must change from 200V to about 100V If you want to use the correct converter must seriously consider the heat dissipation problem The failure rate converter is made with the index rising temperature Made life index with temperature decrease Environment temperature of 10 degrees converter half life Therefore we should pay attention to heat dissipation issue ah Work in the inverter the current flowing through the inverter is a great inverter heat generated is very large can not ignore the heat by the impact Typically inverter installed in the control cabinet We must understand that a transducer is about how much heat Can be estimated using the following formula heat of approximation inverter capacity KW 55 W here if the inverter is a constant torque load capacity Associate 39 s over current capacity of 150 60s if the frequency converter with a DC reactor or AC reactor and also inside the cabinet then heat will be even greater Reactor installed in the inverter side or top measurements better Then you can use the estimate Inverter capacity KW 60 W as the inverter hardware manufacturers are similar so the style can be addressed to the branded products Note If there is resistance then brake because braking resistor large heat capacity so the best location to install the best and the isolated converter such as cabinets mounted above or next to the other So how mining can reduce the heat control cabinet Of inverter installed in the control cabinet the heat value converter to consider the issue According to the heat generated within the cabinet to increase the value to appropriately increase the size of the cabinet So for control to minimize the size of the cabinet the cabinet must be generated to make as much as possible to reduce the heat value If the converter installation the inverter part of the radiator into the outside of the control cabinet will make 70 of inverter heat released to the outside of the control cabinet As the large capacity inverter great heat so more effective high capacity inverter Isolation plates can also be used to separate body and radiator so that the heat radiator to the transducer does not affect the body This effect is also very good Thermal converter design is based on installation vertical sideways heat release will deteriorate it On the cooling fan slightly larger general power inverter all with a cooling fan It also proposed to install the outlet in the control cabinet cooling fans Air inlet filter should be added to prevent dust from entering the control panel Note that control cabinet and the inverter is to be a fan who replaced who can not Two other issues on the heat 1 At an altitude higher than 1000m because its lower air density and should therefore be to increase the cooling air flow cabinet in order to improve the cooling effect Theory should also be considered inverter derating 1000m 5 each However because in fact the design of inverter power and cooling capacity of the load generally larger than the actual use it also depends on the specific application For example where in the 1500m but the cyclical load such as elevators down on unnecessary capacity 2 Switching frequency Inverter heat mainly from the IGBT IGBT 39 s fever has concentrated on and off the moment Therefore high switching frequency inverter heat naturally becomes larger Some manufacturers claim that the switching frequency can reduce the expansion is the truth 3 Vector control is how to make a big torque motor Torque
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