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There are multisource disturbances in permanent magnet synchronous motor (PMSM) drives, which can lead to speed fluctuations, deteriorating the speed control performance. The existing terminal sliding mode controller (TSMC) methods cannot achieve the desired control performance when they are applied as the speed controller. This is because these methods do not overcome the inherent problems of the traditional TSMC, such as the chattering phenomenon and differential calculation. To solve this problem, this article proposes an integrated observer-based TSMC for the speed regulation of PMSM drives. First, a TSMC is proposed. Then, an error-based extended state observer with generalized integrators is proposed and it is introduced to the proposed TSMC. In the proposed scheme, the proposed observer is employed to estimate the multisource disturbances, which are adapted to the TSMC to attenuate the chattering level. In addition, the proposed observer contains the speed error differential signal, which can be employed for the calculation of the TSMC. Thus, the proposed scheme can solve the inherent problems of traditional TSMC. Compared with the existing TSMC methods, the proposed scheme can achieve the desired control performance even in the presence of multisource disturbances when it is employed as the speed controller. Finally, the effectiveness of the proposed scheme is validated on a 2.2-kW PMSM platform.