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Why should dc series motor can be operated for no load and light load?
Wiki User
∙ 12y ago
dc motors can be operated at no load as well as at load condition.But by using the swin burns test the efficiency can be calculated at no load which is more benficial than load test.At industries this swin burns test is used because for load test we have to give separate supply for the load to run.In no load test that power is saved.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agowell, at no load its doing no work and thus serves no purpose
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Advantages of dc series motor?
It develops a large torque and can be operated at low speed. It is a motor that is well suited for starting heavy loads..
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Why is DC series motor is used more than shunt wound DC motor?
Series DC motor develops a very large amount of turning force called torque from standstill and can be operated by using either an AC or DC power source.
Why dc series motor cannot be start without any load?
If a DC series motor is started without load, the armature winding (winding that doesn't spin) current will be at a minimum, resulting in the motor going to maximum speed / runaway, which can cause things to fly apart. As Armature current increases, the speed of the motor will decrease. The armature current will be forced to increase / speed of the motor will be forced to decrease as more and more load is applied.
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Why the series motor is started with some initial load?
In dc motors Speed is directly proportional to back emf and inversely proportional to flux i.e N∝(Eb/φ) In series motor back emf is practically constant. So if we start motor without any load Flux will be small and so speed will be very high. if we start motor without any load it will gain very high speed and may get damaged due to centrifugal forces. Series motor have very high starting torque and used where high starting torque is required.
Why dc series motor is always runs at loads?
At no load, the flux is only due to the residual flux, which is very small. the no load speed of dc series motor is very high. so the rotating part of the motor are damaged. hince dc series motor should never be run without motor.
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What are motor-operated devices in your community?
lawn mower
