Loss minimization in surface permanent-magnet synchronous motor drives

The loss minimization in surface permanent-magnet synchronous motor drives is investigated, Based on theoretical analysis, a lass model controller is introduced to specify the optimal air-gap flux that minimizes losses. Theor etical results are verified experimentally. The proposed loss model control ler is simple and does not affect adversely the cost and complexity of the drive. Implementation of the loss model controller does not require knowled ge of the loss model. The suggested loss minimization method can be applied both in V/f- or current-controlled schemes.