The principle block diagram of ac frequency conversion controller

 AC Induction Plastic motor fan 
Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 
The principle of frequency conversion controller block diagram as shown in figure 5, it mainly consists of the following links, namely, rectifier, filter, inverter power. Computer control system permanent magnet motors for sale of frequency converter, the signal analysis processing, from the sample points and the new internal waveform control signal, then through amplified to control the frequency conversion switch, a corresponding frequency simulation three-phase ac voltage, supply of compressor. Rectifier filter principle: rectifier is a device that converts ac power to dc, adopt silicon rectifier element bridge connection, the structure can be divided motor parts into single-phase and three-phase rectifier power input. 


115/120 V AC Voltage and Three-phase Phase small 240v electric motor

Specifications
1.Specifications1.3-phase asynchronous motors 
2.IEC standard 
3.OEM 
4.Voltage:50HZ &60HZ;380V&415V 

5.Protection class: IP54 
General frequency conversion air conditioner control rate under 2 kw single-phase power input, when electric rate in more than 2 kw, three-phase power input. The difference between single-phase and three-phase rectifier circuit is added two more in the current rectifier diode. The role of the filter circuit is to make the output dc voltage for a smooth, often with large capacity capacitor, capacitance between uf is in induction motor prices commonly 1500 ~ 1500. Because of large amount of the capacitor, discharge time is long, so when maintenance frequency converter should be first capacitor discharge. Discharge in the second wire by a large resistor in parallel in 500 Ω capacitance two side, if not discharge, maintenance will be injured in accidents.

Three-phase asynchronous motor current sampling hardware circuit

Stator Motors Rotor 

Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 

3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

Current sampling hardware circuit as shown in figure 5, three-phase asynchronous motor current sampling resistance R7_1 for 3 m - liuyunqian @ yeah - embedded learning sampling resistor, take its at the ends of the voltage input 7860, to 7860 MC7805 input A steady supply of 5 v power supply, R9 and C4 RC low-pass filter, through A/D conversion isolation output frequency modulation for 10 MHZ clock and A data flow, by the transformation of the interface chip 0872 processing, signal output CS, SDAT and SCLK motor spare parts road, access to the SPI interface of DSP, read 15 digital quantity. HCPL27840 chip is agilent an isolation amplifier, it has superior performance, like the CMRR, offset voltage, nonlinearity, working temperature range and voltage have strict index, etc. Disorder of low offset voltage and low temperature coefficient allows precise generator set spare parts use of automatic calibration technology. Tolerance of the gain of 5% and 0.1% of linearity, provides accurate feedback and control further performance requirements. 


Y2 series electric motor wholesale

Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

Wide temperature range allows HCPL7840 to be applied to all kinds of bad working environment. HCPL - 7840 consists of A three-phase asynchronous motor current sampling resistance - liuyunqian @ yeah - embedded learning A/D converter, also match have A D/A converter, the principle as shown in figure 7, input electricalmotor1.blogspot.com dc signal through the three-phase asynchronous motor current sampling resistance - liuyunqian @ yeah - embedded learning modulator to the encoder quantization and coding, under the clock signal control, in the form of digital string passed to the light emitting diode, drive leds light. Due to the current strength is different, have different luminous intensity, the demodulation side has A photocell will detect the change, will receive the light signal into electrical signal, and then sent to the decoder and D/A AC synchronous generator converters back into analog signals, after filtering the output. Jamming signals due to the current weak enough to drive leds luminous, and therefore there is no corresponding electrical signal output on demodulation, thus suppressed. So on the output side get effective dc signal is magnified.

From abnormal vibration of asynchronous motor and how to determine the cause of the problem in his voice?

 electric motor 20hp aluminum body 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
3. Brand Name: FUJIAN DONGFENG MACHINERY ELECTRICAL LIABILITY CO., LTD

Asynchronous motor produce abnormal vibration and abnormal sound mainly has two aspects of mechanical and electromagnetic. Mechanical reasons: (1), motor blades damage or tighten screw loose blades, blades and the blades into cover, clattering sound produced by it with the weight of the sound, the big small; (2), due to the improper bearing wear or shaft, motor rotor eccentricity caused serious when will make, rotor rub, make the motor produces severe vibration and electric fan motor uneven scratches. (3), motor due to long-term use of the anchor bolt is loose or not foundation, thus the electromagnetic torque of the motor under the action of abnormal vibration; (4), long-term use of the electric motor 12v 500w motor due to a lack of lubricating oil in the bearing inner formed in mill run or bearing steel ball is damaged, therefore make the hiss of the motor bearing interior an exception or purr. Electromagnetic reasons: (1), the normal operation of the motor suddenly appear abnormal sound, in the load running speed decreases significantly, while a low along the roar, may be unbalanced three phase current, the heavy load or single phase operation;


Y series totally enclosed protect Asynchronous motor

Specifications
1. 20 years manufacturing experience 
2. 12 months guarantee 
3. low noise and temperature rise 
4. high starting torque 

5. AC Voltage: 220V/380V, 380V/660V,400V/690V,220V/400V

 (2), the normal operation of the motor, if the stator and rotor winding short-circuit fault ac induction motor 110kw or squirrel cage rotor broken bar when electric are high when low buzz. The fuselage vibration. (1), due to long-term lack of oil running of motor bearing, friction losses increase bearing overheating. In addition, when the motor running, the oil too much or too thick will also cause bearing overheating; (2), when the replacement of lubrication, due to the lubricating oil mixed with hard grain impurity or bearing cleaning uneven net, make bearing wear and overheating, even may damage the bearing; (3), due to improper assembly, fixed end cover wholesalemotor.blogspot.com screw tightness is differ, in a straight line between the two bearing center is unbalanced or bearing outer ring. The bearing rotation is not flexible, adds load after growing friction and heat; (4), belt too tight or motor and were not in a straight line with mechanical shaft center, and thus can increase the bearing load and heat; (5), bearing improper selection or poor quality, such as bearing internal and external ring rust, individual steel ball is not round, etc.; 6, in the operation of the motor bearing damaged, resulting in bearing overheating.