The overall function of alternator generator XGATE

 115/120 V AC Voltage and Three-phase Phase small 240v electric motor
Specifications
1.IEC standard
2.OEM
3.Voltage:50HZ &60HZ;380V&415V
4.Protection class: IP54
Currently a small three phase motor challenge for many embedded system is running in a very short period of time to perform a series of important tasks at the same time. Direct memory access (DMA) module provides the solution is to make through hardware control data using interrupt source to automatically read single phase motor price or write. However, this scheme before the arrival of waiting for next interruption usually DMA to execute commands to read or write, only its function will be restricted. stator In embedded systems, the interrupt events often involved in other logical processing. Before moving the data to the final destination, for example, to intervene to confirm or to modify the Electric motor data signal processing. Thus, a backed by DMA interrupt often can only make part of generator price the work, the CPU will be set aside part of the main program to complete these tasks by interrupt. In this way, the interrupt processing makes the CPU performance in other functions of the diminished. In addition, must have the accurate time single phase 3 hp motor requirements to ensure the normal operation of the system at the same time to deal with complex applications. 


China export aluminum body 220 volt ac electric motor

Specifications
1.AC motor aluminum body 
2.customized 
3. 20 years manufacturing experience 

4. competitive price,high quality 
XGATE application is in order to improve the electric motor parts response speed and reduce the CPU interrupt of the load, through the interrupt execution at the same time with the CPU in order to achieve the purpose of the operation. Then the XGATE can be used to do? motor rotor XGATE is positioned in the fast interrupt processing, can reduce the load on the CPU interrupt processing. Most embedded applications require many interrupt program to deal with simple function, the processor often perform tasks with high rate. These are usually associated with interface functions, such as the speed controller to control feedback and communicate with other parts of the system. XGATE is used to help CPU of these events. XGATE of an important characteristic is its setting although very simple, but allow develop complex applications. XGATE DMA controller is better than that of a smart, because it provides the ability of a complex I/O processing. When the XGATE use with CPU12X nuclear, there are some limitations to consider, but will not affect XGATE the designed function. XGATE provides applications with a higher level of interruption, through Shared some service programs and processes to shorten the work of CPU time.

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.

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.

Current transformer selection and calibration accuracy

 Accuracy refers to within the scope of the provisions of the secondary load, a current of the maximum error when rating. China's current transformer accuracy and error limits as shown in table 1, for different measuring instrument, should choose different accuracy of current transformer. The choosing principle of accuracy: billing measurement with the current transformer is the accuracy of 0.2 ~ 0.5; Used to monitor the size of the load current in outlet and inlet line of each loop current meter should choose 1.0 3.0 level current transformer. In order to guarantee the accuracy of error is less than specified value, generally also check current transformer secondary load (ei), transformer secondary load S2n S2 is not greater than the rated load, the selected accuracy can be guaranteed. The accuracy of calibration formula: S2 S2n or less. Secondary loop load l: www.dongfeng-motor.com depends on the value of the secondary loop impedance Z2 is: S2 electric motor 12v 500w = I2n2 ︱ Z2 ︱ material I2n2 (∑ ︱ Zi ︱ + + RXC RWl) or S2V1 material ∑ Si + I2n2 (RWl + RXC), Si, Zi as the secondary circuits of the instrument, the rated load and impedance of the relay coil RXC for all joints in the secondary loop, contact contact resistance, generally take 0.1 Ω, RWl for the secondary loop wire resistance, calculation formula is: the RWl = LC/(r (S). Type, r for the conductivity of the wire, copper wire 53 m/r = (Ω was), aluminium wire r = 32 m (Ω was), S for cross-sectional area (was), LC for the calculation of the wire length (m). A multitude of transformer to instrument one-way length of L1, is: L1 transformer is star. LC = L1 two-phase V wiring. 2 a phase l1 type connection. The accuracy of current transformer used for the relay protection has 5 p and l0P. Protection level of accuracy is based on accurate rating limit down an electric epsilon % of the maximum error of the composite to nominal (such as 5 p corresponding epsilon % = 5%). So-called rated accurate limit a rated current is a current Induction motor is a current multiples (n = I1 small three phase motor / I1n), also known as rated limit coefficient accurately. Is asked to protect by current transformer in the range of possible, its biggest composite error is less than epsilon % value.

Current transformer - use matters needing attention

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 
Operation of the current transformer, vice edge is not allowed to open. Because once open, have ac electric motor become primary side current excitation current, the magnetic flux and vice side voltage more than normal and endangers one's personal and equipment safety. Therefore, vice edge is not allowed to answer the fuse in the circuit, current transformer are not allowed in the runtime removed without bypass current meter, relay and other equipment. The connection mode ANP gost motor of current transformer load according to the receive operation requirement. The connection mode of the most commonly used for single-phase, three-phase star and incomplete star. Rated than the rating of the transformer and error change ratio KN refers to the rated voltage of the voltage transformer ratio Three phase motor and rated current of the current transformer ratio. The former is defined as the original winding rated voltage U1N and deputy while winding, the ratio of the rated voltage U2N; The ratio of the latter for rated current I1N to I2N.

Sensorless brushless dc motor control - back emf method

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

"The potential laws" is by far the most mature, the most effective, is also the most common and most widely application a rotor position signal detection method. The basic principle of this method is to ignore the influence of fan motor permanent magnet brushless dc motor armature reaction, by detecting "disconnect" (inverter bridge power device is up and down in that phase) off of the back emf zero, in order to get the rotor's six key position signal, and use this as reference, in turn trigger conduction six power tube, drive motor running. This method is often used in the wholesalemotor.blogspot.com armature winding adopts y connection of "three phase six - 120 ° square wave type" driven permanent magnet brushless dc motor (because of square wave motor is just a number of discrete key rotor position signals). 

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
Figure 1 (a) and (b) are given a Taipei wave motor of main circuit, the back emf waveform and trigger a composite state of inverter power devices. The figure 1 (b) shows that at any moment of the inverter power supply, there is always a in ac motor the upper and lower bridge arm are in the off state, namely the phase winding motor is impending, so the phase voltage is equal to the induced potential of the phase winding. In ignore the armature reaction of air-gap magnetic field under the lamination premise of the impact, can be thought of the induced electric potential is equal to the phase winding back emf. Detecting the back emf zero moment, and delay, if appropriate, can get the right trigger time of power device, and the electric potential zero point can be obtained by phase voltage of the voltage or testing.