This paper presents a digital observer controller for permanent magnet synchronous motor (PMSM). The digital observer controller is used for torque ripple minimization of this type of motors. The proposed controller is a newly applied of PMSM. The dynamic response of the (PMSM) with the proposed controller is studied during the starting process under the full load torque and under load disturbance. The effectiveness of the proposed digital observer controller is then compared with that of the conventional PI controller. Experimental results are presented to demonstrate the validity and effectiveness of the proposed control scheme. (C) 2009 Elsevier Ltd. All rights reserved.