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.

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.