Often asked: Why Are The A.C.Series Motors Preferred For Electric Traction?

Why are series motors preferred for electric traction?

DC series motor has develops high torque at low speeds, low torque at high speed, this is the basic requirement of traction unit. Commutating property of series motor is good so we get sparkles commutation. Torque is unaffected by variation in supply voltage. DC Series motor maintenance cost is less.

Why is AC preferred to DC system for powering to electric traction?

This is because, according to railsystem.net, ” DC consumes less energy compared to an AC unit for operating the same service conditions. The equipment in the DC traction system is less costly, lighter, and more efficient than an AC traction system.

Which motor is used in electric traction?

The motors used are induction or asynchronous motors designed to have characteristics suitable for traction. The speed and torque of the motor are controlled by varying the frequency, voltage and current applied to the stator coils. Motors for a typical locomotive would be in the range 400 to 600 kW.

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What are the main advantage of AC transmission system in electric traction?

The primary advantages of AC traction are adhesion levels up to 100% greater than DC and much higher reliability and reduced maintenance requirements of AC traction motors. The friction coefficient between wheel and rail is usually in the range of.

Why are the DC motors preferred for traction applications * 1 point?

Explanation: DC motors are used for traction as, according to the characteristics of DC motors speed is inversely proportional to torque and square of armature current as well, if linear magnetization is concerned. Thus, DC motors are perfectly suitable for traction.

Which motor is most suitable for electric traction?

Many single phase ac motors have been developed for traction purposes but only compensated series type commutator motor is found to be best suited for traction. Single phase induction motors have been abandoned as they are not capable of developing high starting torque.

Why is AC preferred over DC?

Hence, the voltage through transmission lines is very high, which reduces the current, which in turn minimizes the energy lost through transmission. This is why alternating current is preferred over direct current for transmitting electricity, as it is much cheaper to change the voltage of an alternating current.

Which is more preferable AC or DC?

Answer: Ac is more preferred than dc because it is easy to maintain and change the voltage of ac for transmission and distribution purpose. Plant cost of ac transmission is much lower compared to dc transimission. When fault occurs it is easy to interrupt ac supply.

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Do model trains run on AC or DC?

HO scale trains run on direct current (DC), and that creates the possibility of shorting out the track by improper wiring.

Which traction system is best?

In case of heavy trains that require frequent and rapid accelerations, DC traction motors are better choice as compared AC motors. DC train consumes less energy compared to AC unit for operating same service conditions.

Which DC motor is used in train?

Series-wound DC motors. That means current flows through the armature, then through the fields. They have high starting torque, favorable for starting a train. Nowadays the trend is toward AC motors, typically a 3-phase induction motordriven by a DC->AC inverter control.

Which motor is used in metro train?

THREE PHASE SLIP RING INDUCTION MOTOR has been used in DELHI METRO. Dc series motor is ideal for traction but the maintenance cost of which is very high also needs the conversion and smoothening of AC voltages.IM has less maintenance,high starting torque, cheap etc.

What are the advantages of 25kv AC system in electric traction?

Since voltage is high (25 kV), line current for a given traction demand is less. Hence, cross section of the overhead conductors is reduced. Since these small-sized conductors are light, supporting structures and foundations are also light and simple.

What are the disadvantages of electric traction?

Disadvantages of Electric Traction

  • The most vital factor against electric traction is the initial high cost of laying out overhead electric supply system.
  • Power failure for few minutes can cause traffic dislocation for hours.
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What are the major requirements of good traction system?

Ideal traction system should have capability of developing high tractive effort in order to have rapid acceleration. The speed control of the traction motors should be easy. Vehicles should be able to run on any route, without interruption. Equipment required for traction systems should be minimum with high efficiency.

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