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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
How is pull out torque developed?
With some motor designs, as the motor starts to accelerate, its torque tends to fall somewhat before starting to increase again. The point of lowest torque in this region of the curve is termed the 'pull-up torque'.
How many times greater is the starting torque than the normal full-load torque for split phase motor?
4 times
What is the use of double cage rotor in induction motor?
to obtain high starting torque
What is starting torque?
The torque which is produced during the starting of motor is simply called as starting torque.
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.
In what sense dc motor is better than ac motor?
DC motors can spin at a much faster speed and have higher starting torque.
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
Does a 4 hp motor have better starting torque than a 12 amp motor?
YES
Why single phase motor has low starting torque.?
The starting torque is low because this type of motor requires an additional way of ensuring that it starts rotating the right way. It is not economical to give this additional mechanism the capacity to deliver the full load torque.
How is pull out torque developed?
With some motor designs, as the motor starts to accelerate, its torque tends to fall somewhat before starting to increase again. The point of lowest torque in this region of the curve is termed the 'pull-up torque'.
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.
How is the full load current different to the starting current- is the full load current higher or lower than the starting current?
While starting a motor from standstill to its rated speed, the motor has to overcome the inertia and generate enough torque to over come it. In the process the motor takes higher current during the starting. Once started and set in motion the current reduces ti its normal value. Full load current is lower than the starting current normally.
Is torque and current proportional?
Sometimes, for example in a separately excited dc motor. But in a series-wound dc motor the torque is proportional to current-squared, which gives the motor a very high starting torque and this makes series motors very popular for traction.
How many times greater is the starting torque than the normal full-load torque for split phase motor?
4 times
