This is the most important feature of traction motor provides opportunity for saving on energy but also smoothness in braking, saving on wear and tear in mechanical braking system. An Induction motor works as a generator if mechanical speed is more than the synchronous speed.
Which motor is used for traction purpose?
1. The dc series motor develops high torque at start which is an essential requirement of traction service.
Why is induction motor used?
Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable and economical. … Although traditionally used in fixed-speed service, induction motors are increasingly being used with variable-frequency drives (VFD) in variable-speed service.
How do traction motors work?
A traction motor is used to make rotation torque on a machine. It is usually changed into a straight line motion. Traction motors are used in electrically powered rail vehicles such as electric multiple units and electric locomotives.
How does an AC traction motor work?
The AC drive works by converting the traction alternator output to DC (direct current) and reconverting it to a variable frequency AC which powers AC traction motors. … AC traction for locomotives is a major improvement over the old DC systems.
Which DC motor is used for conveyors?
Based on the above answers a Brushless DC Motor/Gearmotor with AC-Powered Speed Control or a 3-Phase AC Motor/Gearmotor with AC-Powered Speed Control would be the best choice for this application.
Which motor is used in metro train?
What is induction motor principle?
The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.
What are the parts of induction motor?
Parts of Induction Motors
- Stator. The stator is the stationary portion of the motor and delivers a rotating magnetic field to interact with the rotor. …
- Rotor. The rotor is the central component of the motor, and is fixed to the shaft. …
- Shaft. The motor shaft is fixed within the rotor, and rotates with it. …
- Bearings. …
Why do train wheels not slip?
In general, the coefficient of kinetic friction is less than the coefficient of static friction. This means it would take less force to slide something at a constant velocity than it would to get it moving.
What is traction inverter?
Traction inverters convert dc power from an on-board high voltage (HV) battery into ac power to drive the main motor or motors of an electric vehicle. In addition, traction inverters perform functions such as voltage boosting, switch protection and regenerative braking.
Why DC is used in trains?
Direct current, either directly supplied, or converted from AC onboard a train, is the most commonly used. … The equipment in the DC traction system is less costly, lighter, and more efficient than an AC traction system. It also causes no electrical interference with nearby communication lines.”
Why 25kV is used in railway traction system?
The main reason for 25kV voltage used in railway is, that 25 kV AC more economical than 1.5kV DC voltage system. Since 25kV voltage system has higher voltage, the higher voltage reduces the current flow through conductor; this reflects to reduce the conductor size. The cost of the conductor gets less.
Why do trains have two pantographs?
Firstly, two pantographs are fixed as to use the other one when the running panto is damaged. Both of them don’t commission at a time. 2. Usually, Rear panto is preferred over front panto as pulling is more easier than pushing.