Abstract
The field weakening control algorithm based on the output voltage regulation of the surface-mounted permanent magnet synchronous motors (SPMSM) has some drawbacks, such as poor dynamic performance and low load capability, especially in the field weakening region with low carrier ratio. In this paper, an adaptive field weakening algorithm is proposed to improve the dynamic loading and unloading performance as the carrier ratio becomes low. In this algorithm, a pre-regulation branch of excitation current is added, which is realized by the q-axis voltage control loop. The q-axis reference voltage changes adaptively with the carrier ratio, so that the system with low carrier ratio will enter the field weakening region ahead of the traditional field weakening algorithm, which is conducive to fast torque response and better load performance. Finally, the effectiveness of the algorithm is verified by the experiments.KeywordsField weakeningLow carrier ratioSPMSM
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