To investigate generator price the relationship between the electric tricycle motor current and battery current

At present, the over-current protection function of electric vehicle controller is used mostly current limiting method. Current limit is when the motor start or locked-rotor control the electric current shall not exceed a maximum value, this is the maximum current limit value. The purpose of the current limiting protection of motor, and then to protect the battery and the controller. For the battery, the power of the motor is the main load, only the current limiting function of the controller will motor current limit, battery current and 3 phase induction motor the power consumption of the squirrel cage induction motor controller was also limited accordingly. So the system in the electric current limit, shall be referred to as the maximum current of motor. But now the author found that the industry is not fully focused on motor current is nature. 

When it comes to current limit, is refers to the battery discharge current, testing is also the battery discharge current, and only said that spare parts the current limit value is how much of the controller, seems to have nothing to do with motor and the working voltage, current limiting results is the controller independent decision. Although, motor current from the battery, small diesel engine but as a result of PWM (pulse width modulation or chopped) technology used in the controller, generator motor and battery current no longer completely is one thing, especially after the electric generator acmotortrading.blogspot.com current limit, the average one to a few times. ac induction motor More important thing is that if you don't speak motor current limit value, will not be able to correct understanding of a series of practical diesel generator set phenomenon. The following, the author will discuss about the problem of the point of view and its related demonstration, hope to get more readers.

The choice of intermediate relay

 Totally Enclosed Protect Feature and Three-phase Phase low rpm ac electric motor
Specifications
power range: 0.12-18.5 kW 
Centre height of frame: 63-160 mm 
Rated Voltage: 380 V 
Rated Frequency: 50Hz or 60Hz 
Packaging Details:80-112 carton box 132 and above plywood box
Intermediate relay mainly plays a role of signal transmission and transformation in the circuit, it can implement multiple control, and small power control signal can be converted to the large capacity of contact action, to drive the www.dongfeng-motor.com electric actuators. Intermediate relay contacts, can expand other electrical control function. Choose intermediate relay, mainly on the basis of the control circuit voltage grade, should also consider the number of contact, type and capacity to meet the requirements of the control circuit. Commonly used in machine tool in the rotor and stator middle of the relay type has diesel generator set two kinds of JZ7 series, JZ8 series. JZ8 for ac/dc relay. The selection of time relay. Time relay is one of the line is commonly used in electrical machine control. Its types are: electromagnetic, air damping type, electric and electronic etc. Application more is the air damping type time relay. small diesel engine alternator generator Its characteristic is reliable, simple structure, time delay setting range wider (up to 0.4 ~ 180 s). The models have JS7 - A, JS16 series. Tao, the choice of a time relay mainly considering control system circuit electric generator delay contact way of the delay, delay range and the www.facebook.com/guohong.trading generator number of the instantaneous contact, but also pay attention ac motors to the coil voltage grade can meet the requirements of control circuit.

Wire and cable, electrical should know some common sense

 induction motor rotor electronic parts 
Specifications
1.20 years manufacturing experience
2.competitive price,high quality
3.Delivery Detail:within 10 days after receiving deposit
Three-phase five wire with color yellow, green, red, 3 phase induction motor light blue, respectively the U, V, W, N protective earthing line double color (PE) transformer in operation, diesel generator each transformer phase current should not exceed rated current; The maximum unbalance current shall not exceed 25% of the rated current. Transformer generator operation should be performed periodically maintenance. The same transformer power electric water pump supply system, unsuitable mixed protective earthing and protection by zero. The voltage transformer secondary coil normally rated voltage 100 v. Secondary side of voltage transformer at work may not be short circuit. Due to short circuit will produce a lot of short acmotor2.blogspot.com circuit current, may burn out transformer, voltage transformer for this time, secondary side are installed fuse protection. 


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

Specifications
1.IEC standard 
2.OEM 
3.Voltage:50HZ &60HZ;380V&415V 
4.Protection class: IP54 

5.Packaging Details:80-112 carton box 132 and above ply wooden box
Secondary side of voltage transformer must be grounded at one end. This is to prevent the secondary coil insulation breakdown, a high pressure into the secondary side, endanger the safety of person and diesel generator set equipment. Current transformer secondary side close to the short circuit conditions at work. Rated current of the secondary coil is commonly 5 a current transformer secondary side is not allowed to open at work, current transformer secondary side must be grounded at one end, to prevent the first and second coil insulation breakdown, the side of a high voltage into the secondary side. Current transformer in diesel engine the join, want alternator generator to note magnetic generator the polarity of the first and second coil, transformer using subtractive polarity marking method in our country.

Level 6 motor magnitude 8 what meaning be?

1. The number of reflect the synchronous speed of the motor, 2 pole synchronous speed was 3000 r/min, 4 pole synchronous speed was 1500 r/min, 6 pole synchronous speed was 1000 r/min, eight pole synchronous speed was 750 r/min. Winding motor vehicle spare parts the way go to form a loop, namely pole logarithm, come in pairs, extremely is the meaning of magnetic pole, the winding magnetic field when an electric current, there will be a pole. . Each group of three-phase ac motor coil produces N and S poles, each motor each phase contains the number of poles is very few. Due to the magnetic poles are paired, so the motor with 2, 4, 6, 8... Extremely. 2. If the frequency of the three-phase ac 50 Hz, the synthesis of the synchronous speed of the magnetic field of 50 r/s, which is 3000 r/min. If the rotating magnetic field of the motor is not just a pair of magnetic poles, further analysis can also get synchronous speed n. and the relationship between the logarithmic p magnetic poles: n = 60 f/p.f for frequency, the unit is Hz. N units for r/min. The ns and pick up the frequency of the alternating current (ac) (f), electrical magnetic pole has strict relationship between log (p). The ns = f/p in China, the power frequency 50 Hz, so the diode motor wholesalemotor.blogspot.com synchronous speed is 3000 RPM, quadrupole motor synchronous speed is 1500 RPM, and so on. The speed of the rotor asynchronous motor is always less than or more than its. The speed of the rotating magnetic field, asynchronous in the name of the resulting. 

The difference between the rotational speed and rotating magnetic field of asynchronous motor rotor (called slip) usually within 10%. Thus, the ac motor (either synchronous or asynchronous). Speed is the restriction of the power frequency. Ac motor speed control, electrical motor therefore, is hard, the best way is to change the power frequency, whereas in the past to change the power frequency is more complex. So before the 70 s, in the required speed. Occasions, multi-purpose dc motor. With the development of power electronic technology, the ac motor frequency control of motor magnetic generator speed technology has started to get practical. 3. The synchronous motor speed = polar logarithmic x frequency (power frequency 50 hz) in our country, the asynchronous motor speed = extremely logarithmic x frequency - logarithmic * slip frequency. In addition, the same power of motor, the greater the speed, the smaller the output torque. 4) of synchronous motor pole: the large capacity of synchronous motor are turning pole type, namely the rotor magnetic pole, is produced by passing a dc excitation winding, and synchronous machine very logarithm is the logarithmic rotor magnetic pole. Eight pole motor rotor is eight pole, 2 p = 8, namely the motor with 4 poles. Steam turbine generator is non-salient pole type motor, more commonly a logarithmic rarely, generally for 1, 2, and n = 60 f/p, so his speed is high, up to 3000 RPM (frequency), and the number of hydro-generator. Quite a lot, for the salient pole rotor structure, the process is more complex, because the number of his lot, so he has a very low speed, perhaps only a few turns per second

Static testing rectifier circuit

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Specifications
1. a replace of Y motor 
2. larger output 
3. save energy 

4. Delivery Detail:within 30-35 days after receiving the deposit
Find converter internal dc power supply side and N and P, diesel engine dispatch multimeter to generator price resistance X10, red table bar got P, black table rods respectively in accordance generator with to R, S, T, there should electric water pump be about a few of the resistance, and the basic balance. Instead received a black watch rod P side, red table small diesel engine rods in turn squirrel cage induction motor received R, S, T, there is a close to www.dongfeng- motor.com the infinite value. Received a red table rod N side, repeat the above steps, should get the same results. We can determine if you diesel engine have the following as A result, the circuit is abnormal, a. resistance unbalanced three-phase, failure can explain rectifier bridge. B. red table welding P side bar, the resistance is infinite, can be alternator generator concluded that the rectifier bridge. Failure or starting resistance fault occurs.

The choice of motor with fuse

 Alibaba China Suppliers!!Export aluminum electric motor casing 
Specifications
1. AC motor aluminum body 
2. customized 
3. 20 years manufacturing experience 
4. competitive price,high quality 
5. Packaging Details:exporting standards match exporting standards 
6. Delivery Detail:within 15 days after receiving deposit 
Choose fuse type and capacity, according to the protection of the load characteristics, the electric motors size of the short circuit current working conditions and use of the occasion. Most of the small and diesel engine medium-sized motor with light load or full pressure relief starting, lamination starting current is usually 5 to 7 times of the rated current; The power capacity is larger, low-voltage distribution main transformer (including capacity) in 1000 ~ 400 electric water pump kva, system impedance is small, when water pump price short-circuit fault occurs, the short circuit current is larger; The workplace such as kiln, grinding, poor ventilation condition, the working environment temperature is higher. 


CCC,CE Certification and Waterproof Protect Feature ac motor
Specifications
power range: 0.12-18.5 kW 
Centre height of frame: 63-160 mm 
Rated Voltage: 220V 
Rated Frequency: 50Hz or 60Hz

Packaging Details:80-112 carton box 132 and above plywood box
Therefore, choose fuse breaking capacity and rated current of the melt, compared with the general industrial use should appropriately increase a bit. 3.1 the melt the experience formula of the rated current melt Electric motor rated current (A) = motor rated current (A) (3). 3.2 melt rated current simplified formula: "melt protection, kw by 6" the simplified formula, is refers to a 380 v cage motors, light load starting or decompression starting full pressure, low operating frequency, suitable for below 90 kw and cage motor. If the actual use of the motor starting frequently, or starting time is long, the empirical formula or water pump price the simplified formula of the above results can be appropriately increased a little, but it should not be too large. In short to achieve when the motor starting, melt by fusing; In the case of short circuit fault, the melt acmotor2.blogspot.com must be reliable fuse, squirrel cage induction motor cut off power supply, to achieve the purpose of the short circuit protection.

The role of voltage transformer and current transformer

The high voltage proportional relationship to transform the 100 v or lower level standard secondary voltage, for the use of protection, measurement and instrumentation. At the same time, the use of voltage transformer can be high voltage and electrical isolation. Although also be in accordance with the working principle of electromagnetic induction voltage transformer equipment, but its electromagnetic structure compared with the current transformer is just the opposite. Voltage transformer secondary circuit is high impedance circuit, the size of the secondary current is decided by the impedance of the loop. Secondary load impedance, small secondary current increase, makes a in a component of current automatically to meet electromagnetic balance of the relationship between the primary and secondary side. A voltage transformer is, as it were, structure and using a limited form of special transformer. Electromagnetic single phase motor current transformer is widely used in power system (hereinafter referred to as "current transformer"), its working principle is similar to the transformer. 


The principle of current transformer wiring, as shown on the left. The characteristics of the current transformer is: (1) a coil in series in the circuit, and as a result, the number of turns in a coil current depends on the load current of the circuit under test. And has nothing to do with the secondary current; (2) current transformer secondary coil of the current meter and relay to the coil impedance is 220v 1.5kw ac motor very small, so under normal circumstances, current transformer run in to a short-circuit condition. The ratio of the current transformer primary and secondary rated current, called the rated mutual acmotortrading.blogspot.com inductance of the current transformer ratio: kn = I1n/I2n Because of one coil rated current I1n standardization, secondary coil rated current I2n unification of 5 (1 or 0.5), so the rated mutual inductance current transformer ratio have also been standardized. Kn can be approximately expressed as transformer primary and secondary winding turn ratio, namely the kn material kn = N1 N2 / type of N1, N2, for one, two coil number of turns.