Traction Motor
Selection of Suspension Arrangement of Traction Motors : A Right Approach
Abstract Motor suspension arrangement is of paramount importance for the reliability of traction motors. Another vital input for the selection of traction motor for given motor suspension arrangement is its rotational speed. Non-availability of any complied information on the relationship of rotational speed of traction motors and their mounting arrangement makes the jobs of Rolling […]
What is Electricity, Drift Velocity and Electric Current?
Electricity is flow of free electrons and also called flow of charge. While doing so, it does work and has been made use during the last two centuries by scientists and engineers to help mankind. Electronic charge can be made to flow under the action of magnetic field associated with motion called electric generator, chemical […]
Re-engineering of Stators of Three phase Traction Motors type 6FRA 6068 used in WAG9/WAP7 locomotives for Improving their Reliability
Research By: R.N.Lal, Senior Executive Director Standards, Ganesh , Director Standards Electrical Directorate , Research Design and Standards Organisation , Lucknow Abstract Insulation and brazed joint failures in the stators of three phase traction motors used in electric locomotives on Indian Railways are primarily on account of excessive shock and vibration and unsupported long length […]
Selection of Suspension Arrangement of Traction Motors : A Right Approach
Abstract Motor suspension arrangement is of paramount importance for the reliability of traction motors. Another vital input for the selection of traction motor for given motor suspension arrangement is its rotational speed. Non-availability of any complied information on the relationship of rotational speed of traction motors and their mounting arrangement makes the jobs of Rolling […]
Current Developments in the field of Traction motors
SINGAPORE Mass Rapid Transit Corporation (SMRT) has awarded a contract worth more than Yen 8bn ($US 80.5m) to Toshiba, Japan, to re-equip a fleet of 66 six-car metro trains with permanent-magnet synchronous traction motors. The new motors are being fitted as part of the refurbismet of the existing drive equipment, the first such upgrade since […]
Permanent Magnet Synchronous Motor
Permanent Magnet synchronous motor popularly called PMSM uses rare earth permanent magnet at the rotor as compared to field winding. With recent advancements of permanent magnet, solid state devices and micro-electronics have helped in making use of this motor for traction purpose. To begin with, this motor has found more and more automotive application […]
Synchronous Motor as Traction Motor
Synchronous machines are used as Generator or Condenser motor and never as traction motor before advent of variable frequency drives. The motor consists of stater equipped with three phase stater winding and rotor with DC field excitation. DC field may be with salient or non-salient poles or with permanent magnet. Three phase synchronous motor cannot start at its rated […]
Three Phase Induction Motor as Traction Motor
Right from the introduction of electric traction, there was a strong desire to use Three phases Induction Motor for Traction application. This could only be possible with the introduction of variable voltage variable frequency control. Working Principle of Three Phase Induction Motor AC induction motor is equivalent to Transformer where secondary is short circuited and […]
DC Series Motor as Traction Motor
There are two basic principles which governs the working of DC machine A current carrying conductor placed in a magnetic field experiences a force demonstrated by Lorentz Law. Direction of the force is given by Fleming’s LH rule. A voltage is induced in the conductor moving in a magnetic field (Faraday’s Law). This voltage […]