Dc motor

electric motor stator rotor lamination motor parts 

Specifications
1. Lamination of electric motor 
2. IP54 class F 
3. 100% copper 
4. silicon steel stamping 

5.stunning performance 
Dc motor performance is closely related to its excitation mode, dc motor excitation method usually has four kinds: single phase motor dc separately excited motor, dc shunt motor, dc series motor and dc compound motor. Master way of four characteristics: 1, dc separately excited motor: exciting winding and armature contact without electricity, excitation circuit is made up of other dc power supply. So the field current is not affected by the armature terminal voltage or armature Three phase motor current. 2, dc shunt motor, shunt winding ends voltage is the voltage on both ends of the armature, but exciting winding with fine wire coils, the number of turns a lot, so has larger resistance, made by his exciting current is small. 3, dc series motor: exciting winding is series and the armature, so this kind of motor with the change of the armature current in the magnetic field have obvious changes. In order to electric generator make the field winding does not cause big loss and voltage drop, exciting winding resistance as small as possible, so direct current series motor is usually use coarser wire coils, his less number of turns. 4, compound motor: dc motor flux produced by the two winding excitation current.

Voltage current transformer model application

 Capacitive pressure machine available in high pressure and ultrahigh pressure used to measure the voltage and the power is in the fan cover power system, electric energy metering, relay protection and automatic control, etc., and can double as coupling capacitor is used for power line carrier communication system. If you have any requirements, can provide for harmonic voltage measurement of internal and external terminals. (1) the installation run place: indoor or outdoor. (2) above sea level: product no www.dongfeng-motor.com more than 330 kv and below 2000 m. 500 kv products no more than 1000 m, according to the order, can offer until 4000 m plateau type products. (3) temperature: - / + 40 degrees, 40-25 / + 45 degrees. 

Selected by the user in order (also can choose other temperature classes). (4) wind speed: not more than 42 m/s. (5) pollution level: Ⅰ level filthy (outer insulation creepage distance 17 mm/kv or higher); Filth Ⅲ level (outer insulation creepage distance 25 mm/kv or higher); Filth Ⅳ level (outer insulation creepage distance 31 mm/kv or higher). Pollution level in by the user to choose when you order it. (6) ice thickness: 3 phase induction motor not more than 10 mm. (7) seismic intensity: no more than 8 degrees. According to user requirements, also can provide higher seismic ability of the product. Rated frequency (8) AC synchronous generator systems: 50 hz or 60 hz have users in order is determined. (9) system earthing conditions: neutral point grounding or neutral not effective effectively; Be determined by the user in order.

Research on the positioning control of asynchronous motor - fuzzy controller

 (1) to determine the fuzzy controller input variables and output variables (2) design control rules of fuzzy controller (3) establish the blurred with the fuzzy method (4) select the fuzzy controller input variable and output variable in the theory field and determine the parameters of the fuzzy controller (quantitative factor and scaling factor) (5) the preparation of the application of fuzzy control algorithm (6) the rational selection of sampling time fuzzy control algorithm electric vehicle motor Generally use a two-dimensional fuzzy controller to the change of the error and error as input variables, to control the change of the quantity of output. The design of the fuzzy control rules generally includes: choose the word set of input/output variables, define a fuzzy variable fuzzy subsets and establish the control rules of fuzzy controller. The word set input and output variables, as a general rule, be {NB, NM, NS, NO, PO, PS, PM, PB}. Fuzzy variables of the fuzzy subset is to determine the shape of membership function of fuzzy ac electric motor subset. General use normal distribution. Control rules available conditional statements describe, that is, If A and B, Then C, Then control rules table is established.


 Blur is the accurate quantity into fuzzy quantity, can use formula: Y = 12 X (a + b) / 2 / (b - a) accurate quantity is the actual range [a, b]. The output of the fuzzy control is a fuzzy quantity, it cannot directly control the controlled object, needs to be converted into precise volume. There are three methods: (1) selection of maximum membership degree method. The method is simple, less but the use of information; (2) take the median method; (3) the weighted average decision method, the use of information, but the large amount of calculation. Controller of the control algorithm can be written as if E = A (I) then EC = B (j) then U = C (ij) (I = 1, 2, 3,... m; j = 1, 2, 3,..., n) based on the sampling error, error change, can calculate the corresponding control quantity changes, to all the X, Y all the elements in the entire portfolio to calculate the corresponding control quantity change, U can be written as matrix (ij) (n * m) will be made table electricalmotor1.blogspot.com matrix, as A lookup table, to be stored in memory. After the real-time control, based on the fuzzy quantitative error value and error changes of look-up table directly, then set the scaling factor can be as the output to control the controlled object.

The analysis of the causes of leakage of transformer oil - packing quality

At the scene of the collapse of the transformer terminals can be electrical motor found at a time,leakage of oil terminal blocks most of fastening nut loose,install this doesn't mean that it electrical motor 24v did not tighten,with plane flange rubber gasket,for the first time after fastening tend to loose because of plastic deformation of the rubber gasket,need a second fastening.Transformer and our factory has been running for many years,there is no rubber gasket deformation problem,may explain why only is rubber gasket ageing lose elasticity,reducing the pressure on the surface of the flange connection.According to my years of experience in maintenance,air isolation rubber gasket to run more than ten years should not have what problem.Such as the transformer operation of our factory in nanjing,cichang has more than 20 years,did not find for porcelain set gasket electricalmotor1.blogspot.com aging oil leakage.Presumably liling porcelain production of transformer set gasket exist quality problems.

Voltage current transformer model meaning

Capacitive voltage transformer (CVT),in 1970 developed the domestic first 330 KVCVT,1980 and 1985,developed fan motor the first generation and second acmotortrading.blogspot.com generation KVCVT 500,1990 and 1995,developed the third and fourth generation KVCVT 500,more than 30 years has accumulated rich 12 volt electric motor experience in scientific research,development,design and production,in the domestic developed generation after generation of CVT new products,three phase induction motor giving impetus to the development of the domestic CVT.CVT's main features are: 1.High electric strength,insulation margin is large,reliable operation.2.Reliable damping ferroresonance.Successful adoption of the new group phase,with strict quality control,ensure that the factory's every piece of CVT are under any of the voltage from low to high effective damping various ferromagnetic resonance frequency.3.Good contact response characteristics.When the second time remaining after a short circuit voltage can fall below 5% in 20 ms,especially adapted to the fast relay protection.4.Has the power grid harmonic monitoring of patent technology.

Stator voltage regulation speed control method

When change mini electric motor of motor stator voltage,be able to get a different set of mechanical characteristic curve,to get different speed.Due to the torque of the motor and the voltage is proportional to square,thus maximum torque decreased a lot,the smaller range of speed regulation,and makes difficult to apply general generator stator squirrel-cage motor.In order to enlarge the speed range,regulating speed rotor resistance value should be adopted for the big cage motor,such as torque motor,USES for regulating wholesalemotor.blogspot.com speed or frequency on the wound rotor motor series resistor.

In order to expand the stable operation range,speed above 2:1 Settings when feedback control should be adopted to achieve automatic adjustment speed.Regulating speed control is a main device can provide voltage change of power supply,the current commonly used ways with saturable reactor in series voltage regulator,autotransformer and thyristor voltage regulation.Thyristor voltage regulation mode is the best.Regulating Dongfeng Electric speed control features:

regulating speed control circuit is simple,easy to realize automatic control; Voltage regulation in

the form of heat transfer differential power consumption in the rotor resistance,low

efficiency.Regulating speed generally applicable to the production machinery under 100 kw.

How to detect motor burned

General motors burn cause too much,there is lack of phase,abnormal voltage,overload,the machine electric motor cooling fan itself quality problem,etc.If is to prevent motor burn out or in things as far as possible to notice it Article 1,for motor fault diagnosis 2,for condition monitoring of motor winding insulation 3,the size of the motor running current monitoring 4,motor temperature monitoring 5,acmotor2.blogspot.com electrical discharge monitoring points and see in which part of abnormal discharge Actually motor fan the main reason motor burn out or because motor can not run normally,leading to the rapid increase of rotor current and burn out motor in a very short time.