![]() ![]() ![]() As they have no excitation winding and, consequently, excitation loss, these motors have high power density and efficiency. Interior rare-earth permanent magnet synchronous motors (PMSM) are a popular choice in electric vehicle drives of various power ratings. ![]() This combination of control methods results in efficiency, which has several maximums and increases overall drive efficiency. Furthermore, the PWM frequency of motor drives is also changed, depending on the operating speed, which improves drive performance. The author suggests usage of the RC at lower speeds and vector control at higher speeds. This article proposes the usage of multicontrol mode, which combines the benefits from each control method. As a result, motor drives operate in other modes with lower efficiency, which is subject to further improvements. The systems constructed according to this algorithm have efficiency with one peak, which is typically selected to be at the rated mode motor drive. Then, at the experimental verification of the drive prototype, the optimal pulse-width modulation (PWM) frequency is detected and the operation of motor drive is adjusted to this frequency and the corresponding sampling time. Both of these control methods have well-known pros and cons therefore, the most appropriate control mode is selected at the stage of drive design. Motor drives with interior permanent magnet synchronous motors are typically used with vector or rectangular control (RC).
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