For a linear induction motor (LIM), the constants of each phase are different due to the motor structure. This can cause the thrust pulsation of the LIM. This paper shows a vector control method of a LIM taking into consideration its asymmetrical constants and its characteristics. The thrust pulsation is suppressed by this control method.
The vector control method with the asymmetrical constants consists of the slip angular frequency control, the time-invariant control and the decoupling control. The speed control system is based on the vector control. The control characteristics of the new system, in the four quadrant operation, are superior to those of the conventional vector control system performed by the average values of the asymmetrical constants.