Abstract: To meet the requirements of better performance and lower cost in designing the control system for industrial sewing machines, this paper presents a design of AC servo control system for permanent magnet synchronous motor, which uses linear hall effect sensors as the motor feedback devices. Because the linear hall effect sensors mounted on the stator produce an analog output signal which is proportional to the intensity of the induced field by the permanent magnet and is exactly in phase with back-EMF, the position and speed information of the rotor can be obtained from the measured linear hall effect sensor signals by using the linear hall effect sensors in place of optical encoders and latched hall effect sensors normally used. Furthermore, the novel field-orientated control algorithm is achieved by generating current references in the three phase stationary frame without the stationary-to-rotating reference frame transformation and its inverse. This AC servo control system is applied in industrial sewing machines, and the experimental results show that the proposed control system is feasible, reasonable and has better performance and lower cost.