Motor with the choice of circuit breaker

electric induction motor fan blade for ac motor 

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

3. Delivery Detail:within 10 days after receiving deposit
Low voltage circuit breaker is generally divided into plastic shell type (also known as the device type) and frame type (also called universal type) two kinds big. The motor under 380 v245kw and more choose molded case circuit lamination machine breaker. Circuit breaker can be divided into the distribution line protection www.dongfeng- motor.com according to the use and protection, lighting protection circuit of the motor and electric leakage protection use and so on. Motor protection circuit breaker selection principles: (1) the set values for the long time delay current is equal to the rated current of the motor. (2) the instantaneous current setting: for the protection of cage motor circuit breaker, the adjusting current instantaneous equal to 8 to 15 times the rated current of the motor, rotor and stator depending on single phase motor the protected cage motor model, capacity and starting conditions. 

Alibaba China Suppliers!!Export aluminum electric motor casing 
Specifications
1. a replace of Y motor 
2. larger output 
3. save energy 

4. Delivery Detail:within 30-35 days after receiving the deposit
For wound rotor motor protection circuit breaker, the adjusting current instantaneous is equal to (3 acmotor2.blogspot.com ~ 6) times the rated current magnetic generator of the motor, depending on the protected wound rotor motor model, capacity and starting conditions. (3) 6 times of long time delay current setting value can return time is greater than or equal to the ac motors starting time of the motor. According to the weight of the starting load, can choose to return time 1 s, 3 s, generator 5 s, one of an 8 s, 15 s. Circuit breaker tripping device setting ac synchronous generator current simplified formula: "instant-on, motor kw 20 times" "thermal trip, according to the rating of the above formula is to protect a 380 v control of three-phase cage type motor circuit breakers, instantaneous motion setting its electromagnetic tripping current, according to the number of" kw "20 times". For thermal trip, according to the rated current of the motor selection.

The working principle of the pump and fan - screw pump

Screw pump is a kind of using screw pitch rotary pump suction and discharge the electric vehicle motor liquid. Screw pump rotor by active screw l (can be a root, also can have two or three) and driven screw ac electric motor 2. Driving screw and driven screw do turn in the opposite direction, thread pitch, fluid from inlet to be screw axis forward pressurization to discharge. This pump is applicable to high acmotortrading.blogspot.com pressure, small flow. Refrigeration system normally used for transport and the speed of oil pump bearing grease.

Motor current and battery current

 AC motor aluminum 2800 rpm motor fan cover 
Specifications
1. Customised 
2. good quality 
3. Surface treatment: Galvanize 
4. AC motor 
Using PWM technology speed of brush the power circuit of the controller. Would like to point out, brushless controller in a pair of upper and lower power tube conduction during the work, 3 phase induction motor also can get a form as a power circuit. So, the following discussion is based on figure 1, but the conclusion is also applicable to brushless diesel engine controller. According to different grid input signal, the power tube T there are three kinds of working state: 1. Fully closed. The Water pump motor does not turn, the battery current value is very small, weak current supply controller circuit. If ignore the weak current circuit power (for convenience, this hypothesis through the full text), motor and battery current and can be thought of as zero. 2. Complete conduction. The battery current flows through the motor, again through the power tube into the ground. Battery current and the motor current and power tube current are equal, all are smooth continuous dc current. Generally, transfer electric vehicle speed moving when the voltage spin to maximum, is this kind of situation. Ignore the power tube conduction pressure drop 3 phase induction motor equal to the motor directly to the battery. Electric characteristics is completely determined by the characteristics of the motor at this moment, has nothing to do with the controller. 3. The switch (chopped). Cycle the power tube grid input is the same, duty ratio control of variable pulse, three single phase motor phase induction motor so the squirrel cage induction motor power tube will continue in the open and disconnect between two states. 


Cast iron ac induction electric fan motor parts 

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

3. Type: iron body of AC electric motor 
Opening period, regardless of the opening of the transient current, battery current and the motor current and the instantaneous www.dongfeng-motor.com value of power tube current is equal; After disconnection, power tube current and battery current is zero. So, the battery current is pulsed current. And motor current situation is: power tube broken moment, according to Faraday's law of electromagnetic induction, the motor coil will produce self-induced electromotive force, its direction is by power tube end is positive, a negative side on batteries. As a result of the existence of stream tube D, to form a closed loop, the induced current. This process is a process of the original release of stored energy in the coil, the induced current will decrease over time until the next opening time of power tube. In other words, shut off during the current is induced current in the motor, it flows through the ac synchronous generator stream tube D, energy consumption in the motor coil resistance and flow pipe. Usually motor electromagnetic time constant is usually greater than the control pulse cycle, so shut off during the motor current will not reduce to zero. To sum up, said the battery are always equal, and the power tube current and battery and motor current in power tube only completely conduction is equal, in the state of chopper is not equal. During the chopper, battery is pulsed current, and the motor current is continuous, the former average average is less than the latter, and its size and the control of the conduction of pulse related to system parameters. The next section will give the relation between them.

Mine explosion-proof motor

 high efficiency high power electric motor Y2 motor
Specifications
1. effiency: IE2 and IE1 
2. 20 years manufacturing experience 
3. 12 months guarantee 
4. low noise and vibtration
(1) the development of high power motor is now the biggest installed capacity of coal winning machine in the world has more than 1200 kw, the drive motor power of 600 kw. That meet the needs of mining coal face scraper conveyor's biggest installed capacity has more than 1500 kw, the drive motor power is 725 kw. The current domestic coal winning machine drive motor power is 400 kw, scraper conveyor drive motor power is 315 kw. (2) development of 3.3 kV ac motor prices and 6 kV voltage level and IOkV mine motors: this is because the popularity after the comprehensive mechanized coal mining area to lengthen, which resulted in increased voltage drop, at the same time, the use of high-power motor for higher voltage class. Mining two-speed motor (3) development: in order to adapt to the coal mine belt conveyor starting at low speed permanent magnet motors for sale and high speed running work needs, foreign mining scraper conveyor is the use of double speed motor drive. But at present domestic mining two-speed motor power range, performance index and form a complete set of the performance of the control switch and so on all has certain gap compared with foreign advanced level. (4) improve the reliability of mine motors: poor working conditions of the mine explosion-proof motor, motor frequent heavy load starting, load Single phase motor change is big, large voltage fluctuation, high temperature and has certain corrosion resistance, etc., all of these affect the use of the machine reliability and life expectancy. (5) to speed up the upgrading of mining explosion- proof motor. (6) unified standard of mine explosion-proof motor.

The principle of power inverter

AC Electric motor Plastic fan parts 

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

4. Delivery Detail: 20-35 days after receiving payment 
 The principle of power inverter. Power inverter (also called frequency conversion module) is converts dc frequency and voltage adjustable three-phase ac frequency conversion device, as shown in figure 5, the frequency conversion air conditioning usually adopt six IGBT bridge driving circuit. Power transistor as switch element cross - straight - to pay circuit, control circuit to make each power transistor conduction 180 ℃, auto parts and the same two transistor bridge arm wholesalemotor.blogspot.com a conduction, the other must be shut off. The element conduction phase difference between electric motor 12v 500w two phase at 120 ℃, within 360 ℃ of arbitrary has three power tube conduction in three-phase load is connected. When the control signal output, A +, A -, B +, B, C +, C - the power tube conduction respectively, thus the three-phase alternating current (ac) compressor operation of output frequency change. In practice, use the IPM (Intelligent Power Module) Module and around the circuit, such as switching Power supply circuit. IPM is a kind of intelligent power module, it will be together with the IGBT ac motor drive circuit and protection circuit encapsulation within the same module, so as to simplify the design, improve the reliability of the whole system. Frequency conversion air now tuning commonly used IPM module has Japan's mitsubishi and sanyo IPM series.

Accurate meaning of the PT and CT

Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor

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

5.Protection class: IP54 
 CT, CT (Current Transformer), English spelling Current Transformer, is the primary side large Current, in proportion to fit through the instrument or use the ac electric motor relay, rated Current 1 a to 5 a or the transformation of equipment. Its working principle and the transformer is similar. Also known as TA or LH (old symbols). Working characteristics and requirements: 1, a winding and high voltage circuit in series, only depends on the high pressure loop current I1, and has nothing to do with the secondary load. 2, secondary loop are not allowed to open, otherwise will produce dangerous high voltage, endangers one's personal and equipment safety. 3, CT secondary loop must have some grounding directly, prevent after the primary and secondary windings insulation breakdown of high voltage, but only a little ground. The accuracy of the 4, and transformation. Wiring forms are: the three-phase y connection completely, two-phase incomplete connection, two motor vehicle differ lift, two-phase three star connection, single-phase completely. Note: Three phase motor the current transformer for measuring core should be easy to saturated when a short-circuit, to limit the growth of secondary side current ratio; Core for relay protection, should not be saturated when a short-circuit, make the secondary side of current with the primary side current is directly proportional to increase.

Anion generator

Anion generator through the anion generator using pulse, oscillation electrical dc negative high voltage, low voltage to use carbon brush tip dc high corona, high speed to release a large number of electronic (e -), and electron cannot is present in the air for a long time (electronic life exists only nS), will be immediately oxygen (O2) to catch in the air, www.dongfeng-motor.com thus forming motor electric a device of the negative ions. Simple anion generator, negative ion increased to hypnosis, stop sweat, analgesia, stomachic, refreshment, eliminate fatigue. Anion generator, 220 v ac mains after rectification to the C2 and C3 charging, charging when C2 to hydrogen bubble small diesel generator conduction and trigger SCR conduction, C3 SCR, B L1 fan cover discharge, after B induction booster, D2 reverse rectification by 8 kv dc make generator M high ionization and produce negative ions.

Ac voltage measurement

In order to grasp the change situation of IC ac signal,can be used with the dB jack multimeter ac electric motor 12v 500w voltage electrical motor 24v to approximate measure of IC.Detection multimeter under ac voltage blocking,pens and insert the dB jack;For no dB jack multimeter,need in pens and concatenated a 0.1 ~ 0.5 u F condenser.The method is suitable for the working frequency is low IC,such as television video amplifier stage,field scanning circuit,etc.Due to acmotortrading.blogspot.com the inherent frequency of the circuit,waveform is different,so the measured data is an approximation,for reference only.

Frequency conversion air conditioning inverter upper arm trigger and drive

"Three phase six take" trigger circuit of the upper arm three power tube circuit is three independent circuits, so to provide electric motor 12v 500w power supply switch power supply has three secondary windings. We analyze one of the circuit can know the working principle of the two remaining road. Upper arm circuit output phase voltage U work. Under the figure marked element of V and W phase for generator set spare parts the corresponding element, the output of the two groups after the voltage required for the operation of the V and W phase control signals. IC2 for CPU control light lotus root, make compressor circuit and main circuit isolation. CPU ac motor triggered by light lotus root IC2 drive signal, the output trigger signal to trigger the u and in IPM terminals u constitute a loop. Eu power tube unit circuit of acmotortrading.blogspot.com voltage access IPM as power supply, and terminal U make loop. The power supply circuit of the public side of U is U phase voltage variable frequency ac output.

The difference between the current transformer and voltage transformer

current transformer secondary short circuit,but will not open; Can open circuit voltage transformer secondary,but shall not be short circuit;2) relative to the secondary side of the load,a mini electric motor small internal resistance and voltage transformer can be ignored,can think of the voltage transformer is a voltage source; While current transformer of a resistance is very big,so that can be thought of as a current source internal resistance is infinite.3) voltage transformer normal work of magnetic flux density is close to saturation value,magnetic flux wholesalemotor.blogspot.com density decreased when fault.

Current transformer magnetic flux electric motors 12 volt density is very low in normal working conditions,and short circuit due to the primary side become large short-circuit current,the magnetic flux density increases greatly,sometimes even more than saturated value. Current transformer in electric power

system is an important part of a device,the principle of which is according to the principle of

electromagnetic induction and manufacturing. It's a little coil number of turns,5kw permanent magnet generator usually adopt single-turn coil,namely a copper or a copper platoon. Take mainly secondary coil measuring instrument or relay coil. Current transformer secondary side can not open,when the secondary side open,a side is mainly used for excitation current,this will be induced in the secondary side of high voltage,so as to endanger the safety of the secondary equipment and personal can also cause a current transformer burned.

How to prevent damage of generator partial overheat

1.The generator outlet,neutral wire connection part should be reliable,in the operation of the unit should be conducted on a regular basis excitation variable to static excitation device of the split phase cable,static excitation device to the rotor slip ring cable,rotor slip ring high efficiency electric motor for infrared imaging temperature measurement inspection.2.Regular check electric braking action contact breaker contact situation,found that the compression spring loose ac three phase

motoror single touch refers to touch with other parallel problems should be handled in time.3.The generator insulation overheat alarm,should analyze the causes,and,when necessary,to eliminating downtime.

4.The old and new production machine maintenance,should pay attention to check the stator iron core compaction and tooth pressure refers to the presence of partial pressure,especially on both ends of the teeth,such as ac geared motor find relaxation phenomenon,should be after processing,can put into operation.Transfer or have a doubt on core insulation,shall be for the iron loss test.5.In the process of manufacture,transportation,installation and maintenance,should pay attention to www.facebook.com/dongfeng.motor prevent welding slag and metal scraps small foreign bodies fall into the stator core ventilation slot.

Motor winding embedded line maintenance

Wound rotor motor is a class of asynchronous motor. Asynchronous motor is according to the rotor winding form, divided into wound rotor and cage. The working principle of asynchronous motor is when the three-phase stator winding of the motor (the difference between 120 degree Angle), after the ventilation with balanced three-phase alternating current (ac), will produce a rotating magnetic field, the rotating magnetic field cutting rotor winding, thus produce induced current in the rotor winding, rotor winding is closed path), the rotor of current-carrying conductor under the effect of the stator rotating magnetic field will produce electromagnetic force, as to form the electromagnetic torque on the motor shaft, drive motor rotation, and the motor rotating direction and rotating magnetic field in the same direction. So the asynchronous motor is also known as induction motor. 1 composition and the function Three-phase asynchronous motor consists of stator and rotor two rotor cutting machine basic parts. Is the fixed part of the motor stator, to produce a rotating magnetic field, mainly by the stator core, stator winding and base parts. The rotor is rotating part of the motor, the rotor iron core and rotor winding and the rotor parts, its effect is obtained rotational torque under the action of a rotating magnetic field. Different rotor according to its structure is divided into squirrel cage rotor and rotor winding. Two basic characteristics and USES asynchronous motor Asynchronous motor mainly used as a motor. It is the industrial and agricultural production permanent magnet motors for sale and the most widely used in national economic sectors and demand one of the biggest motor. 

Metal cutting machine tools, steel rolling equipment, air blower, grinder, water pump, oil pump, light machinery, textile machinery, mining machinery, etc., the vast majority USES the asynchronous motor drive. In people's everyday life, the application of the asynchronous motor is increasingly widely, such as electric fans, washing machines, refrigerators, air conditioning and other household electrical appliances, the use of single-phase asynchronous motor. Drag motor for electric drive, the vast majority of asynchronous motor, its power consumption accounts for about 60% of the total load of power grid. Asynchronous motor is widely used because it has a simple structure, convenient use, reliable operation, high efficiency, and easy, low cost, etc. Asynchronous motor itself, the high performance is poorer, to have a broad smooth speed range, generally USES the dc motor. Nearly one hundred and twenty years, on the basis of the power electronic device and a microcomputer developed ac induction motor speed control system, make the speed regulating performance of asynchronous motor is able to change, and thus its application more widely. Asynchronous motor is running, must absorb reactive power from the grid, which will make the power factor of power grid. Due to the power factor of power grid can use other way to compensate, so this does not prevent the widespread use of asynchronous motor. Main classification 3 asynchronous motor Many different kinds of asynchronous motor, have different classification from different angles. According to the number of stator phase points are single-phase asynchronous motor, three-phase asynchronous motor. According to the rotor winding form, generally can be divided into wound rotor and cage type two kinds. Squirrel-cage asynchronous motor, and a single cage, double squirrel cage and deep www.dongfeng-motor.com slot. According to the size of the motor or power, is divided into large, medium, small size and low power motor. According to the motor protection form into open, protected, enclosed. In addition, you can press the motor run time of ventilation and cooling, installation structure, insulation class, working methods such as classification, here is differ a list.

electromotor parts silicon steel stator rotor

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