Which property should a traction motor have?
The ideal characteristics of an electric motor drive for traction application in an electric and hybrid electric vehicle are high torque at low speed region for fast acceleration, hill climbing and obstacle negotiation, and low torque at high speed for normal driving.
Why traction motor control is required?
The control of traction motors for starting and for smooth acceleration is very much essential to avoid damage to the motors. The control equipment is provided for manual and automatic operation. Usually a master controller is used for the purpose.
What are the desirable characteristics of traction motor?
Desirable characteristics of motor for traction purpose
- A) Mechanical Properties or characteristics: 1) It should be robust in construction to withstand against continuous vibrations. …
- B) Electrical Properties or characteristics: 6) It should have high starting torque.
What are the general features of traction motors?
General Features of Traction Motor & Speed – Torque Characteristic of D.C. Motor. – Good commutation under rapid fluctuations of supply voltage. – Robustness and ability to withstand continuous vibrations. No type of motor completely fulfills all these requirements.
What are the requirements of ideal 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.
What are the chief requirement of a traction motor?
However, traction motors usually require frequent start/stop, high rate of acceleration/deceleration, high-torque low-speed hill climbing, low-torque high-speed cruising, and very wide speed range of operation, whereas industrial motors are generally optimized at rated conditions.
Which motor is used for traction?
List of electric motors used for traction: 1. DC Series Motor 2. DC Shunt Motor 3. AC Series Motor 4.
Are traction motors AC or DC?
Traditionally, these were series-wound brushed DC motors, usually running on approximately 600 volts. The availability of high-powered semiconductors (thyristors and the IGBT) has now made practical the use of much simpler, higher-reliability AC induction motors known as asynchronous traction motors.
How are traction motors controlled?
Metadyne Control of Traction Motor: The metadyne control system is based on constant current system of speed control. … The transformation ratio of a metadyne can be varied continuously. It takes power at constant voltage and variable current and delivers the same at constant current and varying voltage.
What type of motors are used in traction and state the desirable characteristics of traction motor?
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.
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 is the main feature of electric traction?
Important Features of electric traction drives
The traction drive required large torque during start and acceleration to accelerate the heavy mass.