Like other machines, DC generators have some disadvantages, such as: DC generators can’t be applied to a transformer. DC generators have low efficiency because there are copper losses, eddy current losses, hysteresis losses, and mechanical losses. A voltage drop over long distances would occur.
What are the disadvantages of generator?
Disadvantages of ac generators :
- This poses a challenge when it comes to handling because of the greater voltages needed to supply a fixed level of power.
- In these systems require additional insulation because of the greater voltages needed to supply a fixed level of power.
What is the main disadvantage of Series generators?
The main disadvantage of series generators, Output voltage varies as the load varies The e. mf induced in the armature winding is constant with . time Inter pole winding is connected in series with main poles of d.c machine Series motor maintains a more constant speed under varying load.
What are the disadvantages of AC and DC?
- Peak value of A.C. is high and it is dangerous to use so better insulation is required.
- It attracts person who touches it unlike D.C. which gives a repelling shock.
- An A.C. is transmitted from surface of the conductor and hence need several strands of thin wires insulated from each other.
What are the advantages and disadvantages of separately excited DC generator?
Separately excited DC generators have many advantages over self-excited DC generators. It can operate in stable condition with any field excitation and gives wide range of output voltage. The main disadvantage of these kinds of generators is that it is very expensive of providing a separate excitation source.
What are the disadvantages and advantages of AC and DC?
(i) The generation of AC is cheaper than that of DC. (ii) When AC is supplied at higher voltages, the transmission losses are small compared to DC transmission. (iii) AC can easily be converted into DC with the help of rectifiers.
What are the advantages of DC?
Advantages of direct current (DC)
- Increased popularity.
- Residential loads use DC.
- Wide application.
- High power quality.
- Reduced installation cost.
- Easy integration to renewables.
- No reactive power and skin effect.
- Telecommunication and data center usage.
What is a DC generator?
A direct-current (DC) generator is a rotating machine that supplies an electrical output with unidirectional voltage and current.The field is produced by direct current in field coils or by permanent magnets on the stator. The output, or armature, windings are placed in slots in the cylindrical iron rotor.
What is DC series generator?
It is a machine that works on the principle of electromagnetic Induction and it converts the mechanical input given to electrical energy. The field winding is attached in series with the armature winding of this type of machine.
Where are DC generators used?
Applications of DC Generators
They are used in DC motors where speed control is necessary. They are used as portable generators where low power supply is required. They are used in motorcycles as dynamos, in toys such as remote control cars and in appliances such as electric shavers.
What are the advantages of AC and DC generator?
AC can be generated at high voltages, but DC cannot be generated at high voltages because sparking starts at the commutator at high voltage, due to which commutator gets damaged. High voltages AC generators are much simpler and cheaper than DC generators of the same range.
What is the disadvantage of DC motor?
Disadvantages Of DC Motor
DC motors have a high initial cost. Maintenance cost is high and increased operation due to the presence of brushes and commutator. Due to sparking at brush DC motors cannot operate in explosive and hazardous conditions.
What are advantages of AC and DC?
Because of the high voltages that can be generated, AC can be transmitted over long distances. Long-range transmission results in relatively low energy losses resulting from resistance. AC is cheaper to generate than DC. AC can be easily converted to DC if required.
What are the advantages of DC series motor?
Advantages of DC series motors:
- It is an easy assembly and simple design.
- Vast starting torque.
- Protection is very easy.
- It is cost-effective.
- Series wound motors can use for AC or DC supply so it is also known as universal motors.
- Compare with shunt motor DC series motor develop power for the same construction size.
What are the characteristics of DC generator?
Characteristics of DC Generators
- Open Circuit Characteristic (O.C.C.) (E0/If)
- Internal or Total Characteristic (E/Ia) An internal characteristic curve shows the relation between the on-load generated emf (Eg) and the armature current (Ia).
- External Characteristic (V/IL)
What is magnetization characteristics of DC generator?
Magnetization characteristic shows the relation between generated emf at no load (E0) and the field current (If) at a given fixed speed. An internal characteristic curve shows the relation between the on load generated emf (Eg) and the armature current (Ia).
What is the disadvantage of AC?
Disadvantages. Air conditioners use a lot of electricity.In addition, according to The Independent, spending too much time in an air-conditioned environment can contribute to health problems such as asthma, tightness in the chest and other respiratory ailments.
What is the advantage of using a DC alternator compared to DC generator?
Higher Output
One of the benefits of an alternator is that its parts are more robust than what you’ll find in a DC generator. This lets them rotate more quickly without the risk of causing damage. The higher rotation speed means an alternator can generate more power overall.
How do DC generators work?
The working principle of the DC generator is based on Faraday’s laws of electromagnetic induction. When a conductor is located in an unstable magnetic field, an electromotive force gets induced within the conductor.If the conductor is present with a closed lane, the current which is induced will flow in the lane.
On which principle does DC generator work?
Faraday’s law of electromagnetic induction
DC’s generators produce electrical power based on the principle of Faraday’s law of electromagnetic induction.
What is the principle of DC?
The working of DC motor is based on the principle that when a current carrying conductor is placed in a magnetic field, it experiences a mechanical force. The direction of the mechanical force is given by Fleming’s Left-hand Rule and its magnitude is given by F = BIL Newton.
Contents