As well-known, linear motors are widely applied to various industrial applications due to their abilities in providing directly straight movement without
auxiliary mechanical transmissions. This paper addresses the sensorless control problem of tubular linear synchronous motors, which belong to a family
of permanent magnet linear motor. To be specific, a novel velocity observer is
proposed to deal with an unmeasurable velocity problem, and asymptotic convergence of the observer error is ensured. Unlike other studies on sensorless
control methods for linear motors, our proposed observer is designed by regrading unknown disturbance load in the tracking control problem whereas considering theoretical demonstrations. By adjusting controller parameters properly, the
position and velocity tracking error converge in arbitrary small values. Finally,
the effectiveness of the proposed method is verified in two illustrative examples.

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