Master electrical troubleshooting method 2

 ac three phase asynchronous electric motor stator 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality 
Faults exclusion is an important work of maintenance personnel, to eliminate the fault, must know the cause of the failure, more important is can theoretically analysis, solve the fault occurred, should have certain professional theory knowledge, to master the methods of troubleshooting. (a) current test method: test method is usually in the measurement circuit current conformed to the normal, a method to determine the cause of the electrical motor 12v 1000w problem. For low voltage circuit, often use the ammeter or multimeter current file concatenated in circuit to measure; For high voltage circuit, often using clip-on ammeter test. 


Y2 series 0.75kW (1HP) AC Motor for Speed Control

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

4. low noise and vibtration 
(2) the instrument test method: with the aid of all kinds of instruments to measure ac electric motor various parameters, such as using oscilloscope to observe the waveform and the change of the parameters, in order to analysis the cause of the failure, much used in low voltage circuit. (3) the conventional method: rely on human sense organs (such as: some burning in the electrical equipment in use, the smell of burnt food lighter, discharge phenomenon, etc.) and with the aid of ~ simple instruments (e.g. multimeter) to find the cause of the problem. This method is the most commonly used in maintenance, is also used in the first place. (4) to replace the original accessories: in doubt a device or circuit board is faulty, but not sure, and there are alternative parts, alternative test, to see whether the fault disappear, returned to normal. (5) electricalmotor1.blogspot.com direct method: to understand in the cause of the problem or according to the experience, judge the location of the failure, can be directly check suspect point of failure.

Current transformer

Cast Iron electrical motor auto spare parts 
Specifications
1. 20 years manufacturing experience 
2. competitive price,high quality

3. Delivery Detail:within 10 days after receiving deposit 
With current transformer and relay device coordination, mainly occurred in line short circuit overload failure, such as to provide signal to relay device to cut off the fault circuit, to protect the security of the power supply system. Protection with micro current transformer entirely different working conditions and the measurement of transformer, transformer protection is just in several times more than normal current current when to begin to work effectively. Protection of transformer main requirements: 1, insulation and reliable, and 2, enough accuracy limit factor, 3, enough thermal stability and dynamic stability. Protection of transformer single phase induction motor under the rated load can satisfy the requirement of accurate level maximum rated primary current is accurate limit current at a time. Accurate limit coefficient is accurate limit a current rating and electric motor price the rated current ratio at a time. 


gost motor 7.5kw
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
When an electric current is big enough iron core is saturated don't reflect the role of primary current, accuracy limit factor is said this feature. Protection of transformer accurate level 5, 10 p, p said when accurate limit a current rating the margin of error of 5%, 10% circuit failure occurs to produce heat and electromagnetic force, the impact of the current protection with current transformers have to bear. Secondary winding short circuit, current transformer in one second can withstand without damage of a current RMS, said rated short-time thermal current. Secondary winding short circuit, Single phase motor current transformer to withstand without damage in a peak current, according to dynamic stable current rating. Protective current transformer can be divided into: 1, the current transformer overload protection, 2, current transformer differential protection, 3, earthing protection current transformer (zero sequence current transformer)

Switch control equipment

OEM industrial electric motors
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 

4. low noise and vibtration
Switches can be carried out at the same time between multiple ports for data transfer. Each port electric motor 12v 500w can be regarded as independent segment, connected to the AC synchronous generator network device alone enjoy full bandwidth, do not need to compete with other equipment to use. When the node auto parts A to node D send data, node B can send data to the node C at the same time, and it all has two transmission network bandwidth, have their own virtual www.dongfeng-motor.com connection. If used here is 10 MBPS Ethernet switch, the switch at this moment in circulation is equal to 2 x 10 MBPS = 20 MBPS, while using 10 MBPS Shared HUB, a HUB in circulation will not exceed 10 MBPS. Anyhow, switch is a kind of based on MAC address recognition, can finish the package forwarding packets function of network equipment. Switches can "learn" MAC address, and keep it in the internal address table, through between the originator of a data frame and target receivers to establish a temporary switching path, make the data frame directly by the source address to reach the destination address.

Trapezoidal wave type three phase

 Y series best cast iron three phase induction 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

Brushless motor driven wave commutation of the frame. This way has two independent current control loop, to two line circle in real time control of motor. Because the motor is WYE connection, so the third group of coil current and the other two groups of the total current coil of equal size, but in the opposite direction (Newton's laws of current), so we can't separate to control the third group of coil current. Because of three groups of coil current must be combined into a set of stable current motor rotation vector, and the three groups of coil remained at 120 degree Angle, so the three groups of current AC synchronous generator wave form must be a string, and keep the 120 degree phase difference. Position encoder is mainly used to provide two wave signals, and the spacing between 120 degrees. This two way signal overlapping and torque control signal into a signal amplification of wave type to get control of the motor torque. This two current signal through the fan motor phase superposition forming way let the motor rotating current vector. Two motor coil current signal through setting and the string will be input to a pair of P - wave signal I controller. 

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

Due to the third route coil current is negative superposition of two road, so we don't need to control it. Every road P - I controller output signal will be connected to the PWM modulation, and through the bridge road input to the motor coil. The third line circle circle of control voltage of the other two line voltage of negative overlay, and the control voltage of the three road still keep the phase Angle of 120 degrees. In order to make the actual output current wholesalemotor.blogspot.com waveform accurately in accordance with the current control signal, so after setting of current control vector must be like we need rotation smooth, stable size, and always keep a vertical and rotor magnetic field direction. Wave type commutation can get trapezoidal wave type commutation cannot reach the smooth control of the motor. The small diesel generator ideal way, however, can have very good smooth effect, the motor at low speed movement and for the high speed motion of the motor is not any difference. Because when speed up, the current loop controller must track frequency increasing string wave signal, but also to overcome the increasing amplitude and frequency counter electromotive force of the motor.

Squirrel-cage asynchronous motor soft starter application - soft starter way of starting

 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

1 current-limiting starting: in the process of starting, limit the starting current does not exceed a certain value (Im), and then keep the output current, I < Im increased under the condition of voltage, until the rated voltage; The motor speed gradually increases, until the rated speed. Slope voltage starting 2: electric motor 12v 500w in electric vehicle motor the process of starting, the output torque of the motor with the increase of voltage, when starting to provide an initial starting voltage Us, then the output voltage from the Us started to grow in a certain slope, slope adjustable), motor accelerating. When the output voltage reaches up to Ur speed voltage, the motor is basically reach the rated speed. When the motor reaches the rated speed, make the output voltage at rated voltage. 3 starting torque control: use in overloading starting torque control, it is the starting torque of the motor from small to large linear rise. 


AC induction cooling fan motor 

Specifications
1. Customised 
2. good quality 
3. 20 years manufacturing experience 

4. Altitude: ≤1000m

It has the advantage of smooth starting, flexibility is good, have better protection to drag system, its purpose is to protect the drag system, extend the service life of the drag system. 4 starting torque and kick control: at the beginning of the start stage, let the thyristor within a very short time conduction after all fall, according to the original set the value of the linear rise again, enter the starting with constant current. Starting torque and kick control and torque control starting similar is also used in overloading starting, the difference is with acmotortrading.blogspot.com a sudden jump in starting torque to overcome static torque of the motor, then smooth torque rise, shorten the start-up time. Starting: 5 voltage control the voltage control starting is used for light load starting of occasions, in guarantee starting pressure drop the maximum starting torque motor, as much as possible to shorten the start-up time, is the optimal way of light load soft starter.