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Why series motor used in traction application?
becoz of high starting torqe to move train
Why ac motors are not used in railways?
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
Which of the following Dc motor is suitable for high starting torque?
capacitor start motor
What is the use of double cage rotor in induction motor?
to obtain high starting torque
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.
What difference between running torque and starting torque?
Torque is the the force required to move a body about its fulcrum. The starting Torque is the force required to move the body from 0 rpm to the stipulated rpm, the Running torque is the force required to maintain the rpm. The Starting torque is often higher than the running force. Imagine peddling a push bike with one gear (say the one gear is a high gear), the force required to set off will be relatively high in comparison to the force you exert in order to maintain a velocity.
What happens to a shunt motor when the starting torque required is too high at start-up?
If the starting torque required is too high for a shunt motor, it could lead to stalling or jerky operation at startup. This can cause overheating and damage to the motor windings due to increased current draw. It is important to match the motor's torque capabilities with the load requirements to prevent these issues.
Why the starting torque of a dc series motor is high?
load is heavier so starting torque is requiredAnswerBecause the same current is passing through both the armature and field windings, the torque is proportional to the squareof the current. Since the starting current is alway high (no back emf), the torque will be very high indeed.
Which motor has high starting tourque?
Series motors have the highest starting torque. The torque is proportional to the square of the current, and the starting current is so high it has to be limited by a resistor called a rheostat. Series motos are used mainly on trams and trolley buses.
Why series motor used in traction application?
becoz of high starting torqe to move train
Why field rheostat of dc shunt motor kept in minimum position?
it is kept at minimum position to produce more torque which is required for starting a motor
Why ac motors are not used in railways?
Ac motor has a low starting torque so that DC series motor used in railways cause DC motor has high starting torque
Which of the following Dc motor is suitable for high starting torque?
capacitor start motor
What is the use of double cage rotor in induction motor?
to obtain high starting torque
Why dc series motor are use in train?
due to high starting torque and droping charactristics
What are the advantages of induction motor?
1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.
What type of motor is used in centrifugal pump?
3 Phase induction motor because it produce high torque at starting
