<![CDATA[This paper presents development of electric motor speed control system for railway vehicle roller test rig. For maneuver flexibility reason, each must be independently controlled, and consequently, must be precisely controlled to prevent excessive yaw motion of the vehicle. To fulfill this requirement, a control system is built on a 3:10 scaled single roller rig which is driven by a low-cost motor, i.e., AC induction motor. The scale implies acceleration requirement as 1.1 m/s2 and targeted speed as 2000 RPM. The system adopts PID control strategy with Ziegler-Nichols as its tuning method. As a result, the system yields settling time as 12.42 second with steady-state error of 0.75% when the system is being subjected to a step function input. Additionally, the system manages to reject disturbance which is proven by its ability to recover its speed once an amount of disturbance torque is applied. The findings indicate that AC induction motors with PID control strategy offers considerable speed performance over AC servo motors, which are typically much more costly. These findings indicate that AC induction motors with a PID control strategy offer considerable speed performance, making them a viable, cost-effective alternative to the typically more expensive AC servo motors. Moreover, the results have been validated against the roller-rig's operational conditions, confirming that the system meets the required performance criteria.]]>
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