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Speed of 3000 r / min three-phase motor how to change its speed
- Speed of 3000 r / min three-phase motor speed:
Variable pole speed
Change the motor stator winding wiring way to change the motor pole number, which can be level to change the synchronous speed, to achieve a variable speed motor speed. This type of speed motor currently has a series of products to choose from, such as single-winding multi-speed motor.
Change the asynchronous motor stator terminal input power frequency, and make it continuously adjustable to change its synchronous speed, to achieve the motor speed control method known as frequency control. The most energy efficient is the frequency conversion motor, but the need to install the inverter in the power part of the cost is too high.s
What is the difference between AC and DC frequency converters?
- Inverter air conditioner is relatively speaking in terms of ordinary air conditioning, ordinary air conditioning compression motor using AC induction motor, speed unchanged, 50HZ when the speed is about 2880r / min. The inverter air conditioner is the first 220V, 50HZ single-phase AC into three-phase inverter AC (25 ~ 118HZ, 56 ~ 160), the supply of compressors, through the frequency changes to adjust the compressor speed, so that continuous cooling capacity to adapt to air conditioning Load needs. L inverter air conditioner works: inverter air conditioner compressor by the variable frequency motor drag, the power inverter output frequency changes in the alternating current to the motor, so that the motor speed can be based on the needs of indoor cooling and continuous change, the final compressor cooling capacity To achieve continuous changes in the automatic control. In order to meet the continuous changes in the cooling capacity, the refrigeration system uses an electronic expansion valve, the pulse motor switch valve core, rapid control into the evaporator refrigerant flow. Power frequency changes from the inverter to achieve, as shown in Figure 1: 220V, 50HZ of the mains input, the frequency converter A / D AC / DC conversion, D / A inverter, the output frequency required by the three-phase alternating current, Room switching power supply principle is similar.s
Do you need to rectify before switching?
- Need to rectify.
The inverter is actually an inverter, which first turns the alternating current into direct current, then switches the DC power with the electronic components, changes to alternating current, and the general-purpose inverter is equipped with a thyristor and an adjustable frequency The frequency is adjustable in a certain range, and it is used to control the number of revolutions of the motor, so that the number of revolutions can be adjusted within a certain range.The frequency converter is widely used in the speed regulation of AC motor. Technology development direction, with the development of power electronics technology, AC frequency conversion technology from theory to practice gradually mature. Inverter not only smooth speed, large range, high efficiency, start current is small, smooth operation, and energy saving effect is obvious. Therefore, the exchange frequency control has gradually replaced the traditional traditional slip speed, variable speed control, DC speed control system, more and more widely used in metallurgy, textile, printing and dyeing, smoke machine production lines and buildings, Water supply and other fields. Generally divided into rectifier circuit, flat wave circuit, control circuit, inverter circuit, and so on several major parts.s
The relationship between the power supply of the notebook and the battery
- 1, when the notebook battery is fully charged, and connected to the power adapter, usually by the adapter directly to the host power supply, this time the battery is idle, the adapter power supply without battery conversion.s
The emitter E of the inverter inverter module and the AC output U are not directly connected together
- Corresponding to a phase of the branch of the IGBT inverter module generally appear in pairss
The inverter flat rate transferred to 29, on the submersible pump to burn the coil ?!
- 4, high-speed motor: high-speed motor running process will produce a large number of harmonics, enhance the output current of the inverter, resulting in a lot of heat. Therefore, the inverter selection is also larger than the ordinary one gear.
5, explosion-proof motor: In some mines, oil extraction environment, the frequency conversion system is explosion-proof motor, the choice of inverter should use the explosion-proof function of the inverter, and the inverter placed in a safer place.
6, the degree of protection: for dust, wet applications, inverter selection should pay attention to its protection level. Or choose Ampang letter AMB inverter, the fan can also run in the water.
7, single-phase motor: When the scene using single-phase motor, the inverter useless.
8, variable pole motor: When the field using variable pole motor, the inverter selection should ensure that the maximum operating current should not exceed the rated current of the inverters
On the notebook power adapter output current and voltage issues
- On the real virtual cable that adapter is rectifier filter output, no regulator, the notebook internal regulator, the adapter does not need to regulator.
3.25A is smaller than 4.5A, because the adapter has a power margin that can be used. Summer attention to touch the adapter surface is overheating.
Conditional or buy a large number of good current.s
4 pole 380V 4-5.5KW frequency conversion motor and inverter about how much money, such as the use of electromagnetic speed motor comparison
- About 2,000 yuan, electromagnetic speed and vector inverter can bring feedbacks
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