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Which motor has a higher starting torque?
A series-wound commutator motor has the best starting torque because the torque is proportional to the square of the current, and the starting current is set by a current-limiting resistor which is switched out as the motor builds up speed.
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
Why is the starting torque of a wound -rotor motor higher per ampere of starting current than that of a squirrel cage motor?
The starting torque of a wound-rotor motor is higher per ampere of starting current than that of a squirrel cage motor due to the ability to control the rotor resistance. In a wound-rotor motor, external resistance can be added to the rotor circuit, allowing for increased torque production during startup without drawing excessive current. In contrast, squirrel cage motors have a fixed rotor resistance, which limits their starting torque and results in a relatively lower torque per ampere of starting current. This design feature enables wound-rotor motors to provide better performance in high-torque applications.
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'.
When does an electric motor develop maximum torque?
An electric motor develops maximum torque at or near standstill, which is when the motor is starting to turn from a complete stop. This is due to the fact that torque is directly related to the current flowing through the motor, and at standstill, the motor can draw maximum current, resulting in maximum torque. As the motor speed increases, the back electromotive force (back EMF) rises, reducing the current and, consequently, the torque.
What is starting torque?
The torque which is produced during the starting of motor is simply called as starting torque.
Which motor has a higher starting torque?
A series-wound commutator motor has the best starting torque because the torque is proportional to the square of the current, and the starting current is set by a current-limiting resistor which is switched out as the motor builds up speed.
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
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.
Why starting torque is not the maximum torque value?
Starting torque is the torque produced by a motor when it begins to rotate from a standstill. It is typically lower than the maximum torque because maximum torque is achieved at a specific operating speed and load conditions, allowing the motor to utilize its full power output. Additionally, starting conditions often involve resistance and inertia that limit the initial torque, while maximum torque can be reached under optimal conditions when the motor is already in motion.
Does a 4 hp motor have better starting torque than a 12 amp motor?
YES
Why is the starting torque of a wound -rotor motor higher per ampere of starting current than that of a squirrel cage motor?
The starting torque of a wound-rotor motor is higher per ampere of starting current than that of a squirrel cage motor due to the ability to control the rotor resistance. In a wound-rotor motor, external resistance can be added to the rotor circuit, allowing for increased torque production during startup without drawing excessive current. In contrast, squirrel cage motors have a fixed rotor resistance, which limits their starting torque and results in a relatively lower torque per ampere of starting current. This design feature enables wound-rotor motors to provide better performance in high-torque applications.
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 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.
When does an electric motor develop maximum torque?
An electric motor develops maximum torque at or near standstill, which is when the motor is starting to turn from a complete stop. This is due to the fact that torque is directly related to the current flowing through the motor, and at standstill, the motor can draw maximum current, resulting in maximum torque. As the motor speed increases, the back electromotive force (back EMF) rises, reducing the current and, consequently, the 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.
