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Installations of DC machines are found more regularly within heavy industrial practises, as torque and speed can be varied over a wide range easily, and with minimal reductions in efficiency.
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DC motors are often favoured in industry, as post installation, power supply is cheap and simple to maintain, and can also be utilised straight from a battery unlike AC supplies
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The speed of a DC motor can also be controlled with a simple and inexpensive control unit compared to that of an AC motor, as only the armature voltage control is needed.
Disadvantages·
DC machine installations are expensive. They also require large and potentially damaging currents upon start-up before power efficient speeds can be achieved.
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Despite the advantages stated above, DC machines are seldom used as a form of power supply within industrial premises; as power is supplied as AC by default, and cost of installation is too high.
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DC motors are unreliable at low speeds, and are also physically much larger than AC supply motors.
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DC machines use commutators that reverse current. These are susceptible to wear and tear unlike slip rings that are used in AC machines instead, therefore resulting in higher maintenance expenditure.
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What is DC shunt motor?
A shunt DC motor connects the armature and field windings in parallel or shunt with a common D.C. power source. This type of motor has good speed regulation even as the load varies, but does not have the starting torque of a series DC motor
Where can you find a diagram for load test of a DC shunt motor?
See the diagram linked below.
What type of dc motor is suitable for variable torque operation?
A shunt-wound DC motor can maintain its speed well when the load torque varies.
What is difference between stab shunt dc motor and shunt dc motor?
A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque
Why dc shunt motor known as constant speed motor?
A shunt motor isn't literally constant-speed; its speed does fall between no load and full load. If you plot a graph of speed against load, you will find that the speed falls by around 10% or so. Compared with other d.c. motors, this fall is considered to be insignificant -hence the term, 'constant speed'.We apply a similar term to transformers, when we describe them as being 'constant voltage' machines. They're not literally 'constant voltage', but their regulation (difference between full-load and no-load voltage), is considered to be insignificant.
Advantages of dc shunt motor?
it maintains a constant speed under varing load
What is DC shunt motor?
A shunt DC motor connects the armature and field windings in parallel or shunt with a common D.C. power source. This type of motor has good speed regulation even as the load varies, but does not have the starting torque of a series DC motor
What will happen to a shunt motor if a shunt field coil opens while the motor is running under light load?
Motor will rotate at very high speed leading to destructionAnswer from Kinindia.com
If the speed of the dc shunt motor falls due to loading what will be the effect?
on adding load on a dc shunt motor, the amount of current and torque will increase. but terminal voltage will decrease
What is function of dc motor in lift?
Shunt motor is used. For constant speed ,torque will high when load is increased
Why can we start a shunt motor under no load but why can't a series motor?
The torque on a series motor is determined by the square of the armature current and, so, is very large -much larger than that of a shunt motor. Consequently, on starting, with no back-emf being generated, the torque on a series motor can be dangerously high if the machine has no mechanical load.
Where can you find a diagram for load test of a DC shunt motor?
See the diagram linked below.
DifferEnces of long vs short shunt DC COMPOUND MOTORS?
the basic difference is ,in short shunt motor the series field winding wont carry any current under no load condition whereas in long shunt motors series winding will carry no load current.....
Is swinburnes test direct or indirect test?
in this test their is a no load on dc shunt motor so it is an indirect test
What type of dc motor is suitable for variable torque operation?
A shunt-wound DC motor can maintain its speed well when the load torque varies.
Is there any load in dc shunt motor?
Yes. In order to do work, there has to be a load. In order for there to be current, there has to be a load. Now, that is probably not what you meant to ask. If so, please restate the question correctly.
What is difference between stab shunt dc motor and shunt dc motor?
A series motor respond by decreasing its speed with small increase in current for a given load torque. A shunt motor holds its speed nearly constant with large increase in input current for same amount of load torque
