Emc test alternator generator methods motor electric and instruments

3 Phase induction Electrical Motor MS Series for winding machine

Specifications
ambient temperature:-15 -40 
above sea level : not exceed 1000m 

rated voltage:+-5% 
Emc test according to its purpose fan motor can be divided into diagnostic tests and standard test. Diagnostic test purpose is investigating the cause fan motor electric motor parts stator winding of the generator electromagnetic compatibility problems, determine the specific parts of the noise and interference, thus to prepare for the suppression measures. Standard test is according to the method of electric motor parts generator emc Electric motor standard testing equipment, assess its reach the standard request. Product standard test must be conducted before entering the market. Emc standards including electromagnetic disturbance (EMI) emission www.dongfeng- motor.com testing and equipment of immunity (EMS) tests. EMI testing is a measuring equipment to launch the harassment, EMS test is for equipment and all kinds of harassment, the anti- interference ability of the test equipment.

Wire and cable, electrical should know some common sense

Must pay attention to the connection 3 phase induction motor is correct and reliable, and the secondary side are not allowed to answer the fuse or switch. Even if for some reason to dismantle the secondary side of the instrument or other devices, also must first to secondary side short circuit, then on again. Low voltage switch is lamination machine refers to under 1 kv isolating switch, circuit breaker, fuse and so on low voltage power distribution equipment controlled by load, must branch out, it is forbidden to more than a brake control and confusion. Low voltage rotor power distribution equipment and interlock of self-provided generator which should be reliable. It is strictly prohibited to bring their own power equipment and power grid parallel operation without permission. Low voltage power distribution equipment around before and after the operation and maintenance of channels should be laid on the insulation pad, piled up other items are strictly prohibited in the channel at the same time. Welding equipment: equipment first, followed by power supply. Dismantle rotor and stator devices: power supply, before equipment. 

Zero circuit: the first, followed by the line of fire. Down the line: after the first wire, scattered line. Low voltage fuse cannot as the motor overload protection. Fuse rated squirrel cage induction motor voltage must be greater than or equal www.facebook.com/dongfeng.motor to the working voltage of power distribution lines. Rated current of the fuse must be greater than rotor or equal to the rated current of the melt. Fuse breaking capacity must be greater than the possible maximum short-circuit current distribution circuit. Melt the selection of rated current, must meet the line normal working current and the starting current of the motor. For electric and lighting load short circuit protection, the rated lamination machine current of the melt is equal to or slightly greater electric generator than the rated current of the load. For single motor, melt rated current (1.5 2.5) or the motor rated permanent magnet generator current melt rated current in the power distribution system, and at a lower level shall coordinate, in order to realize the selective protection purposes. The next level should be smaller than at the next higher level. Ceramic plug fuse should be installed vertically, qualified fuse, must be used in other copper wire, etc. Replace the fuse. Spiral can fuse power into the line on the ac motors center of the base terminal, they can pick up the load for the shell of the screw terminals.

The method of three-phase to single-phase electrical operation

full load 75% load 50%load three phase induction electric motor Y series B35
Specifications
-One year warranty 
-Within 25 days delivery 

-Life: 5-7 years
 If only single-phase power generator source and the three-phase asynchronous motor use, can adopt the method of shunt capacitance change the 3 AC motor phase induction motor three-phase asynchronous motor to single phase operation. As shown in auto spare parts the figure below: (a) is Y connection motor connection auto spare parts method; Figure (b) as the delta connection motor connection method. In order to improve the starting www.dongfeng-motor.com torque, QC will start the capacitance on startup single phase induction motor access lines, at startup after exit. Work capacity calculation formula: GC = 1.950 I/Ucos phi (U F) : I for the rated current of the motor, U for single phase motor single-phase power supply voltage, cos phi for the power factor of the motor. When calculate the ac motor working capacity, start capacitance QC choose work 1 -- 4 times.

ZT ac contactor selection of several techniques and matters needing attention

TYG series rare permanent magnets three phase synchronous motor
Specifications
1. a replace of Y motor 
2. larger output 

3. save energy 
The selection of auxiliary contacts, according to your device, you can generator price choose 1 a1b, generator is a normally open normally closed, a2b 2, 3, a1b, 5 a1b, etc. Protection, can be used with thermal relay type, such as GMC - 22 contactor can be fitted with GTH - 22 of thermal relay auto spare parts 3 phase induction motor is used. Complete sets of www.facebook.com/guohong.trading installation size, in complete set of choices of ac contactor small diesel engine is a size small, beautiful contactor, and generally choose GMC series contactor, stable performance, beautiful and easy. Choice contactor, should according to the control load of work is a light task, general tasks, or heavy tasks, or other load power of the motor and operating conditions, such as choice and level of water pump price ac synchronous generator the current contactor. Again according to the control circuit power supply situation choose the contactor coil parameters, and choose according to use environment general alternator generator or special specifications of products, such as series of CJX2 ac contactor, performance is better.

A motor current limiting process

 Small power 3 phase ac induction motor
Specifications
1. 100% Copper Wire 
2. Voltage Tolerance 5% 
3. Aluminum, CE, ISO9001 
4. Factory Price 
To added points: 1. The motor stuck fast and slow is controlled, so the length of the current limiting process 3 phase electric motors induction motor is controllable. 2. The current limit implementation of motor current can only be monotonically, maximum is IDmax. diesel engine Therefore, the current limit is really for it. 3. The current limit after the start of the battery current is not monotonically, but rather monotonous, so motor stalling a slow will see it on the measuring instrument suddenly go back to the bad phenomena. Wall is fast ac synchronous generator but can't see, this is caused by instrument response speed slow. Figure 2 shows the phenomenon. It is simple, a generator continuous current after periodic chopper, unless it is the instantaneous value during the conduction has increased dramatically over time, the average continuous value must be less than before the chopper. 


AC motor aluminum 2800 rpm motor fan cover 

Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 

4. AC motor 
But during the conduction, motor inductance is concatenated in the loop, it limits the current rapid increase, so the current limit point current of battery, the battery alternator generator current average after must be greater than the current limit. Can not have misunderstood think this is the "limit", on the contrary, this is a sign of "limit up". The real limit to resist the phenomenon is the current limit points after the battery current will increase, and the faster the motor stalling, the greater appreciation. So, now it is often said that the current limit value, actual it is the stability of the battery after the motor current limiting current value, it is not the maximum, but the minimum value, call it blocked the battery current than say it battery current limit value seems to be more reasonable. Motor after completely www.facebook.com/guohong.trading halt current and as for the picture must rise, it is because at the beginning of the current limiting energy stored in the motor coil to a certain extent, take time to release. Motor current waveform so can finally magnetic generator stable triangular waveform for ac motor cycle, condition is that inductive energy storage in a cycle is equal to the release of energy.

Stepper motor main circuit

 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

Stepper motor main circuit mainly includes the drive circuits and logic control circuit of two parts. Driving circuit power single phase motor price using 28 V, voltage Fan Si 4.5 ~ 40 V, improve the driving voltage can increase the output of the torque motor in the high frequency range, the voltage selection according to usage. VMB, VMA for step motor drive power supply pins, should access ceramics decoupling capacitors and electrolytic capacitor voltage regulator. OUT_AP, OUT_AM, OUT_BP, OUT_BM pin motor phase 2 output interface, respectively, due to the internal integration the fly-wheel diode, the four outlets without external like Toshiba 8435 driver chip diodes, thus greatly reduce the circuit board wiring space. The NFA, NFB is respectively A and B phase motor drive current largest define pins, maximum current calculation formula for the IOUT = 0.5 (A) (V)/RNF (Ω), if the predefined motor each phase of the maximum driving current of 2.5 A, take RNF = 0.2 Ω, PGNDA, PGNDB, SGND is www.dongfeng-motor.com respectively A and B phase motor drive and logic power supply pins. Power supply for 5 V logic control circuit, VDD power supply pins for logic, should be connected to the decoupling capacitor and bypass capacitor reduces interference noise.

Stator Motors Rotor
Specifications
1. 20 years manufacturing experience

2. competitive price,high quality

M0, PROTECT the working status and over-current protection light; RESET to RESET chip, low level effectively; Capacitance of the OSC receive size determines the frequency of chopper, recommendation 100 ~ 1 000 pF, chopping frequency is 400 ~ 44 kHz; M2 and M1 set pins for segmentation, external dial the code switch can be set different subdivisions, such as the step, half step, 1/8, 1/16 segment segmentation. Because of the step motor at low frequency, vibration is big, the noise big shortcoming, need to solve the segment. Stepping motor subdivision control, in essence ac motor is through the control of the stepping motor in the exciting winding current, make the stepping motor for the synthesis of internal magnetic field uniform circular rotating magnetic field, so as to realize the segmentation of stepper motor step Angle. Under normal circumstances, the synthesis of magnetic field vector amplitude decide the size of the step motor rotation torque, the Angle between the adjacent two synthesis of magnetic field vector size step determines the size of the pitch Angle. DCY2, DCY1 external dial the code switch setting current attenuation mode lamination (0, 25%, 50%, 25%), used to meet the needs of the different step motor. Due to the motor itself, power supply conditions and other factors such as pulse frequency, the influence of step motor may produce high-frequency noise, attenuation model through the current Settings can reduce or even eliminate the noise. Figure 3 shows the attenuation model of 0 and 50% when the change of the coil current, but waveforms has obvious improvement.

Ya si column three-phase asynchronous motor

The no-load current is too large,If ruled out the possibility of a lack of phase operation,it is likely to: motor magnet 1,may have a slight internal winding short circuit.generator generator set 2,actuator or motor itself bearing rust,mechanical 12v motor resistance is too large.If continue to use wholesalemotor.blogspot.com the output power will reduce,also may be further failure,so that finally cannot be used.

The reason of bad ventilation cooling overheat the motor

A the environment temperature is too high,the inlet air temperature is high.rotor cutting machine B,inlet have sundry block,make the poor into the wind,wholesalemotor.blogspot.com causing little into the wind C,the motor internal dust too much,the impact of heat dissipation D,fan damage or installed backwards,cause there is no wind or air generator stator volume is small E,not installed wind cover or inside the motor end cover not installed wind deflector,motor without 220v ac electric motors a certain wind path.

Motor fault diagnosis and maintenance

Motor running or failure, can see, hear, smell, touch four methods to prevent and troubleshooting in

time, guarantee the safe operation of motor. Look, observe the motor running with and without

exception, in the process of its main performance for the following situation. 1. The stator winding

short circuit, may see the motor smoke. 2. The serious overload or short of motor phase operation,

speed will slow down and have a heavy "buzzing" sound. www.facebook.com/dongfeng.motor 3. The

motor run normally, but suddenly stops, will see the wiring loose sparks; A portion of the blown fuse

or stuck. 4. If the motor vibration, could be gearing jammed or motor fixed, loose bottom bolt, etc.

5. If the motor inside contact point and forms a discoloration, burn mark and stain, then there may

be local overheating, poor contact or winding conductor joint burned, etc. Second, listening to the

normal operation of the motor should be a uniform and lighter "buzzing" sound, no noise and special

voice. If the noise is too big, including electromagnetic noise, bearing noise, ventilation, noise,

mechanical friction sound, etc., may be failure precursor or failure phenomenon. For electromagnetic

noise, if the motor send out the voice of high and low and heavy, the reason may have the following

kinds. (1) the uneven air gap between stator and rotor, the voice of high and low and high and low

time interval constant, this is so that the stator and rotor bearing wear and tear caused by a heart.

(2) three phase current balance. This is by three-phase winding grounding, short circuit or poor

contact, if sound is very depressing, serious overload or short of motor phase operation. (3) the

iron core is loose. Due to vibration in the operation of the motor in the core fixed bolt looseness

motor part caused by loose core silicon steel sheet, making noises 2. The bearing noise, should often listen in the motor running. Monitoring method is: will the screwdriver end to resist bearing installation site, on the other side, close to the ear can hear bearing operation. If the bearing is working well, its sound is continuous and tiny "rustling" sound, does not have the change of high and low, and metal. If appear

the following voice is not normal. (1) bearing operation "creak" sound, this is metal, generally for

bearing caused by lack of oil, should be apart bearing charging right amount of grease. (2) if there

"pumping mile", this was the voice of the ball rotates, generally for dry or lack of oil, grease can

be loaded with a moderate amount of grease. (3) if there "raise price" or "creak" sound, for the

bearing inner ball irregular movement of sound, this is the inside of the bearing ball or motor

long-term need not, grease caused by the asynchronous motor drought. 3. If the drive mechanism and transmission mechanism continuous instead of high and low sounds, processing can be divided into the following kinds of situation. (1) periodic "snapped" sound for belt joint is not smooth. (2) periodic

"drumming sound for loose coupling, or between the pulley and shaft and key or keyways wear cause.

(3) uneven clash, as the wind leaf fan cover cause collision. Three, smell smells odour of a motor

through diagnosis, and can also prevent failure. If found to have special smell of paint, the

internal temperature of the motor is too high; If found to have a heavy, focal smell the smell of

burnt food or may be insulation breakdown or winding has been burned. Four, touch the temperature of

the motor to some parts also can determine the cause of the problem. Application in order to ensure

safety, when using a touch of the hand to touch an electric shock around motivation shell, bearing

parts, if discover the abnormal temperature, the reason may have the following kinds. 1. Poor

ventilation. Such as fan, air duct jam, etc. 2. The overload. Cause excessive current and the stator

winding overheating. 3. The stator winding interturn short circuit or three phase current balance. 4.

The frequent start or braking. Around 5. If the bearing temperature is too high, it may be caused by

bearing damaged or short of oil.