Battery charging

 Battery charging:

    Battery charging means that the secondary cell density is less than 0.8 or it is charged immediately to recharge the battery.
                      Generally, DC to charge secondary cell. Is used but every space is in DC Since there is no getting it, AC needs to be converted into DC and then the battery is charged. This type of tangor bulb type rectifier is usually used, The motor generator set is used for this method where the battery is charged.
                     For this, the connection of the positive terminal of the DC source should be done with the positive terminal of the battery and the connection of the negative negative terminal of the source should be done with the negative negative terminal of the battery. If the polarity succeeds, then the DC ends the two ends of the source connecting the battery Negative wires submersing in acidic water or submerged water will have a higher level of bubbles. So the concept of polio Sector.
                      Now we will learn about the methods of battery charging which are used in the following two types of methods.

1.constant current charging method and
2.constant volteg charging method

1.constant current charging method :

                                       This method is used where high voltage DC cleaning is found, but the voltage of the battery should be low in such circumstances. Now the battery is not emf less compared to the supply voltage. So that in the battery series Lamp or Resistance is connected. That controls the charging current. This method is not so useful due to loss in this way.
                                       By this method, many batteries attached to the series can be charged. However, the battery gets disconnected due to the battery voltage more than the supply voltage voltage.
                                     Charging current I = V-Eb / R + r

                                                                                           V = DC Supply voltage
                                                                                        Eb = Counter emf of battery
                                                                                          R = Outer barrier of lamp or resistor
                                                                                            r = Internal barrier of battery

 Advantages and disadvantages:

      This way, the battery charging increases the life expectancy but it takes more time to charge in charging. It is often disadvantaged to check the value of charging current frequently.

2.constant current charging method 

                      In this way, the charging or supply voltage for the full time of charging is kept constant and therefore it is known as a steady voltage method. Change in the value of the charging current, by controlling the Field Regulator of Dynamo or by controlling the speed of the primary movers. Initially the charging current value is too high or higher, which decreases in battery emf This is a common way to charge the battery

Advantages and disadvantages:

         This way, it takes less time to charge than charging that the battery is charged much faster than this method, whereas this method reduces the efficiency of the battery and reduces battery life.
                            However, battery can also be charged using AC solution. This type of method is used only for D.C.Apliance. However, if the AC supply is available only then in the case of the first receiptfire. AC supply conversion is done by DC supply in the use of the Rectifier full wave or the Half Wave. In this way, the value of the first voltage is reduced by the transformer to DC


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हिन्दी में जानकारी के लिए यहाँ क्लिक करे

Why is the need for a starter to start DCMotor?

       

                    When the motor comes in to start, the resistance of the armature will be zero, since the starting current will pass through the armature in a very large amount. However, if this motor is connected directly to the line, then in that case, it may get very much current in the beginning. That fuse flies and damages to the motor's commutator and also damages the carbon brush
               Eg. 440 v, 3.75kw. The idea of ​​the motor's resistance to the order is 0.25 ohm and the value of the flower load current is 50 A. Now if the motor is directly started on the line, then in the case of the motor will take 440 / 0.25 = 1760A The value of which will be 35.2 times the load current.
                In order to avoid this, the resistance in the series of Artefacts is introduced only for start of 5 to 10 seconds for which the start of the start-up value is in the limit and the resistance is removed when the motor comes in full speed. The motor can be prevented from loss due to start-up
                Although a pair of motorcycles with a direct supply to the smallest motor can be started, there is no harm to such a motor. Thus, the starter is used to start the motor to prevent such type of damage.

Causes of High Sparking on the commutator of Generator

                     

                     Sometimes sparking occurs on the generator or on the commutator of the motor, the reasons are shown as follows

1. Rubbed brush
2. The grade of brush is false
3. The brush is sticky
4. The pressure on the brush should not be exactly the same
5. The surface of the computator is rough
6. The brush is not suitable for bending
7. The space between the brush is not the same
8. Mike has stepped out of the segment
9. The condition of the brush is wrong
10. There is a meaning fault in the armature
11. Artychat being short
12. Overload is also responsive

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हिन्दी में जानकारी के लिए यहाँ क्लिक करे 

Explain the voltage regulation in DC Generator

         The output voltage of the generator is decreasing or increasing in the proportion of loads generated over the generator, so it needs to be kept constant so that the output voltage of the generator needs to be kept in control, which can be explained by two ways as follows.
1. By changing the field current and
2. By changing the speed of the generator

1. By changing the field current

                                                In this type of way, the value of field curtants is changed by placing variable resistance in the field of field sounding. Changes in the value of the field current will also change in the magnetic field and therefore it is possible to edit the desired amount in the output voltage.

2. By changing the speed of the generator:

                                                In this type of way the speed of the generator is changed, now the generator output is based on the speed of the generator, increasing the voltage of the speed of the speed, and the reduction of the speed will reduce the voltage. The speed of the voltage will not change Value can also be increased or decreased.


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हिन्दी में जानकारी के लिए यहाँ क्लिक करे 

DC Compound Generator

DC Compound Generator:

                    This type of generator is a mixed example of series and shutter generator. In this generator, its internal field has the connection of series and shunt type. Its connection is found in the figure. This type of generator has two main types.

1.Comyutetiv Compound Generator
2. Diffractional Compound Generator

Commutative compound generator also has two types again
1.Comyutetiv Short Shunt Compound Generator
2.Comyutetiv Long Shunt Compound Generator

Similarly, there are also two types of differential compound generator
1. Differential Short Shunt Compound Generator
2. Differential Long Shuttle Compound Generator

             Since the use of Short Shut Commutative Compound Generator is overly used, we discuss that the combination of the shunt field in the generator of this type is done in the acrostic armature. And the direction of current from the shunt field and direction of flowing from the series field is the same. Long shunt can also be attached to this generator.
             The generator of this type gives the voltage of the variable value without taking into consideration the load. But by adjusting the edges of the field field sounding or by placing the resistor in the acres of the series field, its regulation can be modified. It is called a divider. This generator There is a combined characteristic feature of the series and the shutter generator.
             There are also three types of command generators available by upgrading to the corners of the series field
                  1. Over Compound Generator
                  2. Flat Compound Generator
                  3.under Compound Generator

Use of Compound Generator:

                      It is used to compensate voltage drops in electrically traction. And when the transmission line is emphasized at the end, the compound generator is also used to provide light and power.
                        When a generic generator is used only in welding.

DC Shunt Generator

DC Shunt Generator

                   In this generator the field is connected with the armature and the load in parallel In this generator, the terminal voltage can be controlled by placing the resistor in the field circuit which changes the field current. Its field winding is made up of several corners of thin wire

The characteristic of the shutter generator:

               

When the current flows, the voltage drops due to the barrier of the armature, the brush
Arteractic reactions reduce the total flux and decreases the amount of indus emf.
Due to reduction in terminal voltage, the shunt field also decreases fluctuating current due to which it decreases again in flux and therefore in indoor emf

Use of the shunt generator:

         1. This type of generator is used for battery charging because it gives the correct voltage according to the condition. Even in the case of current reversal from battery, its polarity does not change.
          2. This generator is also used as an accelerator for the secretion motor and the generator
          3. This generator is used for electroplating and other types of electrolysis.

DC series Generator

DC series Generator:

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हिन्दी में जानकारी के लिए यहाँ क्लिक करे 

                            In this type of generator, the field field's winding is made of thick copper chains or copper leaflets, and it is attached to the series with armature and load. The circuit must be closed before the machine is exposed. The use of the series generator For specific projects such as booster.

                            In this type of generator, the voltage also increases as the load increases.

Characteristics of Series Generator:

1.Increasing armature current increases the artery resistance, which reduces the total flux and also reduces the terminal voltage.

2.Due to the Armature drop, the voltage in the terminal voltage reduces compared to the voltage produced

3.Magnetic transmitted means that the increase in current increases only in flux in very small proportions.

Using Series Generator:

             The use of DcCeries generators is found especially in booster and arc lamps, which are used as stable electric current generators.

What is field excitetion? type of field exaited ganerators?

What is field exaitetion


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हिन्दी में जानकारी के लिए यहाँ क्लिक करे

                The arrangement for generating field flux by sending direct current from field coils is called acetylation.

Field Overwriting Type: D.C. Generator Type:

                And when to get the current of the field to be displayed on its own armament. And when the field of attaching the field is done by the current on its own armature. Then it is called the self-generated or self-generated generator of the generator. Thus, on the way to demonstrate the field, the DC generator can be divided into two types Are there

1. Separately Exaited Generator:

                In this type of generator, flux is produced by winded coils on the top of the pole casing. In Paul's pseudo, the external source can be passed from D, C, this can be external source battery or other dynamo. Displays the connections of the generator. Field winding is done in the series and it will be given a DC clearance from the battery through Variable Resistance The change in current in the Variable Resistance Field coil and in the symmetry of the resulting flux in the generator of this type is independent from eksaitesana system load circuit and has no impact on the voltage of the indyusa due to changes in load separetarali eksaiteda Using generators, electroplating and boosters etc. and using field regulator as well as power supply Is done for the purpose

2.Self Exaited Generator:

                 Field sounding is given in the acrows. And the current flows in such a way that it increases the magnetic power of field poles Increase in ray flux increases the amount of emf induced in the armeature of the arithmetic and therefore increases in flux again, due to this, the armature produces a full value voltage in very short period of time, to indicate the field in this type of generator. There is no requirement of any external sources, the emf induces in armenture are used only in field accent.

                 Types of self exaited generator
1. Serial Generator
2.Shunt generator
3.Compaund Generator