Which motor is used in traction application?

Which DC motor is used for traction purpose?

DC series motor has been the most used solution for the traction of locomotives, trolleybuses, trams and others, characterized by a speed and torque control using additional resistances, which means a low efficiency, electromechanical contactors, high maintenance costs, dynamic braking in resistances.

What is a traction drive motor?

A traction motor is an electric motor used to drive a piece of machinery. … Traction motors are used to power escalators. One reason for the use of a traction motor on a diesel locomotive is the ease with which the power can be applied to the wheels.

Why induction motor is used in traction?

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.

Why are traction motors used?

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.

Which type of DC motor is used in elevators?

DC cumulative compound motor having high starting torque up to 450% depending upon the degree of compounding. The speed regulation is varying up to 25 ~ 30%. That’s why these motors are used in elevators.

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What is DC series motor?

Series DC motors are a group of self-excited DC motors in which the field coil is connected in series to the armature winding and thus a higher current passes through it. A series DC motor mission is to turn the electrical energy into mechanical one based on electromagnetic law.

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 speed of dc motor?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

Which induction motor is used in traction?

Several drives employing squirrel cage induction motors and synchronous motors are in use for traction. Variable frequency control is used both for induction motors and synchronous motors. Modes of operation of an induction motor traction drive are shown in figure 2.