Quick Answer: Which Applications Require High Starting Torque?

How do you choose torque for a motor?

The required torque is calculated by multiplying the sum of load torque and acceleration torque by the safety factor.

When the required torque for the motor varies over time, determine if the motor can be used by calculating the effective load torque..

Why is high starting torque required?

It means your motor / rotational machine has high moment of inertia. Larger moments requiring more torque to rotate. For rotating machines (like electric motors, ic engines) if the moment of inertia is high, since the torque is rotational moment, starting torque will be higher.

Which motor is used for high starting torque?

DC motorDC motor has high starting torque.In a series motor the same current flows through the armature and the field winding. The torque is therefore proportional to the square of the current.

What will happen when DC motor is connected to AC supply?

1. What will happen if DC shunt motor is connected across AC supply? Explanation: In case of parallel field connection, it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. DC motor will be heated up and it may burn.

What is the special feature of single phase induction motor?

What is the special feature of single phase induction motor? Explanation: The single phase induction motor has no inherent starting torque. Thus special means should be used to make it self starting.

What is a starting torque?

Starting torque is the torque transferred by the shaft coupling during run-up (see Start-up process). It is calculated based on the ratio of power (P) to angular velocity (ω) and is represented as a rotational speed function.

Which motor is constant speed?

DC shunt motorHence, a DC shunt motor is able to self-regulate its speed, and can be referred to as a constant speed motor.

Which will give the highest starting torque?

Which of the following motor will give the highest starting…A. D.C. shunt motor.Schrage motor.Repulsion start and induction run motor.Universal motor.

Which of the following induction motor will have better starting torque?

3-phase induction motor will have_________ starting torque and __________starting current. Which of the following induction motor will have better starting torque? What creates a rotating magnetic field in an induction motor? Single phase motors are more powerful than polyphase induction motors.

In which direction does a shaded pole motor run?

The direction of rotation is from the unshaded side to the shaded (ring) side of the pole. Since the phase angle between the shaded and unshaded sections is small, shaded-pole motors produce only a small starting torque relative to torque at full speed.

How much torque does a 1 hp motor have?

The 3600 RPM, 1HP motor produces 1.5 ft. lbs. of torque at 3600 RPM. So if your 1HP pump was operating at 1800 RPM, the 1800 RPM motor would be producing 3 ft.

What is pull out torque?

Pull-out torque is the maximum torque that can be delivered without losing steps. It reaches its maximum at the lowest frequency or speed, and decreases as frequency increases. … Pull-in torque is the maximum torque at which a motor can start rotating at a given frequency.

Which of the following application requires high starting torque?

Series wound DC motors are best for applications that require high startup torque, without the need for speed regulation. Like a shunt motor, as a load is applied to a DC series motor, the motor speed decreases, which reduces the back EMF and increases the net voltage.

Which DC motor has maximum self loading property?

Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load. It is advisable that motor should not be used beyond some load value, as it may damage itself by self-loading. 5.

How do you increase the torque of a motor?

If you want to adjust the output torque within the rated torque range, you can usually adjust the input voltage or the amount of excitation current. If the DC motor has been set, the torque can only be increased by the speed reducer, which can be multiplied or even increased by a thousand times.