What are the special features of traction motor?
Motor types and control
Direct-current motors with series field windings are the oldest type of traction motors. These provide a speed-torque characteristic useful for propulsion, providing high torque at lower speeds for acceleration of the vehicle, and declining torque as speed increases.
What does a traction motor do?
Traction motors are powered by electricity and generate the power to rotate the wheels of the train. The turning force produced by traction motors is transmitted to the wheels via the driving gear unit and axle. Traction motors are typically mounted in the trucks where the wheels are housed.
What are the features of electric traction?
Important Features of electric traction drives
- The traction drive required large torque during start and acceleration to accelerate the heavy mass.
- Because of economic reason single phase supply is used in AC traction.
What are characteristics of good traction system?
(i) It should possess high starting torque so that rapid acceleration can be achieved. (ii) It should be self-contained and compact unit. ADVERTISEMENTS: (iii) The traction equipment should be capable of withstanding temporary overloads.
Which motor is best for 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.
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.
What are the requirements of traction motor?
General requirements of Traction motors / traction system
- High starting torque. A traction motor must have high starting torque. …
- Simple speed control – …
- Suitable speed Torque Characteristics – …
- Parallel Running – …
- Overload Capacity – …
- Size of Motor – …
- high Efficiency. …
- Braking –
Which motor is used in tramway?
Dc motor (Ma) and induction motor (Mc) are currently manufactured and used in 105 N tram drive, their parameters are available. Dc motor (Mb), brushless motor (Me) and slip-ring motor (Md) pa- rameters have been determined by analysis.
Do trains run on AC or DC?
Railways and electrical utilities use AC for the same reason: to use transformers, which require AC, to produce higher voltages. The higher the voltage, the lower the current for the same power, which reduces line loss, thus allowing higher power to be delivered.
Which type of motor is used in electric traction?
AC traction motors have replaced DC motors in many traction applications. 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.
Which motor is preferred the most for traction purpose Why?
DC series motor is best suited for DC traction, cranes as it provides high starting torque and easy speed control which is primary requirement of DC traction.
What are the advantages and disadvantages of electric traction?
This is non-electric drive mostly used for road transport. Main advantages of the drive are low investment and flexibility of the routs and have the disadvantages of low overload capacity, uneconomical operation, high maintenance cost and short life.