Abstract
This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.
Highlights
The cogging torque is one of the most representative components of torque ripple in the permanent magnet synchronous motor (PMSM)
Unlike most studies that have only analyzed the effects of manufacturing errors on cogging torque, this paper proposes a method to counteract the influence of unevenly magnetized magnets, which are one of the main contributors of cogging torque distortion [19]
The relationship between the remanence of each PM and the cogging torque is derived from the basic form of the Maxwell stress tensor equation
Summary
The cogging torque is one of the most representative components of torque ripple in the permanent magnet synchronous motor (PMSM). Studies on the reduction method for the cogging torque have been actively carried out to minimize the torque ripple [1,2,3,4,5,6,7,8,9,10,11]. As a result of those errors, the measured cogging torque of the actual motor may be very different from what is expected in the simulation [12]. This phenomenon can be a critical issue to those applications that need precision control of the motor and are sensitive to noise and vibration
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