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Which motor is used in many Kando system
AC series
DC motor
Three phase ac motor
A and C
A and C
The Kando system is a specific electric traction configuration, primarily used in early AC electrification, that utilizes both AC series motors and three-phase AC induction motors for different operational stages or control requirements. By employing these two motor types, the system allows for effective speed regulation and regenerative braking capabilities in railway applications.
The Kando system is a specific electric traction configuration, primarily used in early AC electrification, that utilizes both AC series motors and three-phase AC induction motors for different operational stages or control requirements. By employing these two motor types, the system allows for effective speed regulation and regenerative braking capabilities in railway applications.
TтИЭ╬жIaтАЛ тАФ Torque equation for AC Series motor
NsтАЛ=P120fтАЛ тАФ Synchronous speed of 3-phase induction motor
The system relies on phase converter technology where the single-phase AC supply from the overhead line is converted into a multi-phase supply. This allows the usage of robust three-phase induction motors for driving axles, while AC series motors are utilized where universal motor characteristics (high starting torque) are specifically required. The control is achieved by varying the frequency or voltage through the converter stage to manage the torque-speed characteristics of both motor types.
The Kando system was an experimental approach to address the limitations of single-phase power supply in locomotives.
It demonstrates the versatility of using rotary converters (phase converters) on-board to transform supply characteristics.
The system acts as a precursor to modern variable frequency drive (VFD) traction systems.
Improved starting torque characteristics
Effective utilization of mature AC motor technologies
Complex on-board equipment (rotary phase converters)
High maintenance due to rotating machinery
Electric Locomotives
Heavy Traction Railway Systems
The system is historically significant in the development of Japanese National Railways (JNR) electrification.
Option B is incorrect because a DC motor would require an additional rectifier stage or wouldn't be the primary identifier of the Kando system configuration.
D is correct тАФ The Kando system leverages both AC series motors and three-phase AC induction motors to optimize traction performance under AC electrification.
In electric traction exams, always distinguish between 'system of supply' (AC/DC) and 'system of motor control' (Kando/Ward-Leonard) as they are frequently tested together.