VVVF traction control with speed sensorless vector control

摘要

Speed sensorless traction control system must be the last solution of AC drive system. Higher power of a induction motor in limited space, higher precision and faster response in rotating speed sensing of a torque control, higher reliability by eliminating sensitive electric parts from traction motor, those requirements lead system to the higher performance. That is a low cost system with higher acceleration and deceleration characteristics and a fine adhesion control comfortable for passengers. This paper shows also a result of test running on JR-E127 EMU in a depot. And we propose a new solution of a speed sensorless traction control.