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We design an adaptive speed regulator for a permanent-magnet synchronous motor (PMSM). The proposed adaptive regulator does not require any information on the PMSM parameter and load-torque values, thus, it is insensitive to model parameter and load-torque variations. We implement the proposed adaptive-speed-regulator system by using a TMS320F28335 floating point DSP. We give simulation and experimental results to verify that our method can be successfully used to control a PMSM under model parameter and load-torque variations.