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The series motor has poor speed regulation. When the load speed of the machine increases, the DC shunt motor keeps its constant speed from no load to full load. The dc series motor’s Torque drops sharply when the speed increases.
What is the advantage of a series motor?
The series motor has the highest starting torque for a given power rating. When the motor is overloaded, the speed drops and the torque increases. While delivering high torque during an overload, the series motor draws less current and power from the source compared to a shunt or compound DC motor.
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 is the chief advantage of a DC series motor?
The primary advantage of the DC motor is that it can develop constant torque over a wide speed application. Power supply is an important consideration in the application of DC motors. The most common way to provide DC voltage to a motor from an AC line is through the use of an electronic drive.
What is the main advantage of a shunt motor?
Advantages of Dc shunt motor: The power supply of the DC motor is any way cheap. Shunt would motor able to runs at a predetermined speed. The speed of a dc shunt motor is sufficiently constant. Direct current machines can use for heavy industrial applications where the torque and speed wider range.
What are the disadvantages of DC motor?
Disadvantages of DC motors High initial cost. Increased operation and maintenance cost due to the presence of commutator and brush gear. Cannot operate in explosive and hazard conditions due to sparking occur at brush (risk in commutation failure).
What are the characteristics of a series motor?
Since a series motor develops high starting torques at low speeds and low torque at high speeds, therefore, speed – torque characteristics of a DC series motor is a hyperbola. High starting torque enables, even a small series motor to start a heavy load.
What are the disadvantages of a generator?
Emissions: One of the major drawbacks of diesel generators is that they produce carbon dioxide, nitrogen oxide, particulate matter, and other dangerous exhausts that release into the atmosphere.
What are disadvantages of a commutator?
The disadvantages of commutators are high consumption of electrical-grade copper, sparking, and wear caused by brush friction.
What is a series DC motor?
Series DC Motors In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current. Typically, series DC motors create a large amount of starting torque, but cannot regulate speed and can even be damaged by running with no load.
Which motor is more powerful AC or DC?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
What is advantage and disadvantage of DC motor?
Below are some of the most prominent advantages of DC motors: They are suitable for low-speed torque. They have adjustable speed. They offer a wide range of speed control both below and above the rated speed.
Are DC motors quieter than AC?
Why choose DC? The new technology in the motors means that DC fans are generally much quieter than AC motors. DC fans use up to 70% less energy than an AC fan. DC fans are generally faster to respond to the remote control, have more speed options and have the reverse function on the remote.
What is the main disadvantage of a shunt motor?
As the load changes, a shunt wound motor runs at a predictable speed. If variable speed is desired, constant speed can be a disadvantage. The lifetime of the motor is usually not improved by brushes.
What are the disadvantages of direct current?
If we transmit the electricity in the format of direct current within the wires, the main portion of the electricity is already reduced and wasted in the shape of heat that will cause nothing but loss. This is the basic disadvantage of the direct current.
Where is shunt motor normally used?
The applications of shunt DC motor include the following. These motors are used wherever stable speed is required. This kind of DC motor can be used in Centrifugal Pumps, Lifts, Weaving Machine, Lathe Machines, Blowers, Fans, Conveyors, Spinning machines, etc.
When would you use a DC motor?
DC motors are suitable for many applications – including conveyors, turntables and others for which adjustable speed and constant or low-speed torque are required. They also work well in dynamic braking and reversing applications, which are common in many industrial machines.
Why are DC motors so expensive?
The heavier rotor of the DC motor may require more expensive bearings. The rotor design is probably the most important factor in making the DC motor more expensive. If the DC motor stator has permanent magnets, that could make it more expensive or not depending on the magnet material.
Why not use DC current in our homes?
Direct current is not used at home because for the same value of the voltage, DC is more lethal than AC since direct current does not go through zero. Electrolytic corrosion is more an issue with direct current. DC inductors are more complicated. It requires commutators, electronic switches and brushes.
Which DC motor has maximum self loading property?
You can study other questions, MCQs, videos and tests for Electrical Engineering (EE) on EduRev and even discuss your questions like Which DC motor has got maximum self-loading property? a)Series motorb)Shunt motorc)Cumulatively compounded motord)Differentially compounded motorCorrect answer is option ‘D’.
What will happen if suddenly load is removed from the motor?
So, if the load is suddenly thrown off, the motor will tend to rotate and dangerously high speed. Thats the reason why the series motors are always chain or belt driven.
Which power is mentioned on a name plate of a motor?
Which power is mentioned on a name plate of a motor? Explanation: Name plate of the motor shows rated values i.e. rated speed, rated current, rated voltage. It also shows output power available at shaft when all other quantities are set to rated values.
