Which type of DC motor has the highest starting torque?

The torque of the DC series motor is proportional to the square of the armature current. That is why DC series motor has high starting torque. The DC series motor produces the highest torque among all kinds of motors.

Which of the following Motors has high starting torque?

24. The capacitor-start motor has a high starting torque.

Which will give the highest starting torque?

For 1st question A) Repulsion motor has high starting torque.

Why does DC series motor have higher starting torque?

For any dc motor,torque is directly proportional to the flux and armature current. … Hence torque is directly proportional to the square of armature current. So as current during starting is 1.5 times the rated so starting torque is higher for series motor.

Does induction motor has high starting torque?

Slip ring induction motor has high starting torque. Because slip ring is connected through the resistance. When the supply is on the resistance is increases the phase difference is decrease due to this starting torque is increases.

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Which has more torque AC or DC?

AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.

Which motor is used in small lathes?

DC shunt motor is used for driving constant speed line shafts, lathes, vacuum cleaners, wood-working machines, laundry washing machines, elevators, conveyors, grinders and small printing presses etc.

What is the single phase induction motor?

Single-Phase Induction Machines. Single phase induction motors generally have a construction similar to that of a three phase motor: an ac windings is placed on the stator, short-circuited conductors are placed in a cylindrical rotor. … i.e. the cross product of flux densities will be zero, the motor produces no torque.

Which single phase motor has high power?

98. Which single phase motor has relatively high power factor ? (D) Synchronous motor.

How do you increase the torque of a DC motor?

To increase the torque … that a bit harder. All you can do, electrically (as you can do it mechanically via gears), is to reduce the source impedance to maximise the current that can be delivered for a given stator impedance. Rewind it with more turns of thinner wire.

Can you reverse a brushless DC motor?

3 Answers. Swapping any two of the wires connecting a brushless DC motor to its ESC will reverse the direction it spins. … This offset is what allows the swapping of two wires to reverse the direction of the motor’s rotation.

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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.

Why starting current is high in motor?

Why High Starting Currents:

Resistance and leakage reactance circuit consist of resistance and leakage reactance of stator and rotor of induction motor connected in series. A load resistance (variable) is connected in series to the fixed rotor and stator impedance. During starting of the motor, slip will be one.

Why is DC motor current so high?

Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. … It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.

How is rated torque calculated?

  1. Torque (lb.in) = 63,025 x Power (HP) / Speed (RPM)
  2. Power (HP) = Torque (lb.in) x Speed (RPM) / 63,025.
  3. Torque (N.m) = 9.5488 x Power (kW) / Speed (RPM)
  4. Power (kW) = Torque (N.m) x Speed (RPM) / 9.5488.
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