Abstract
As one of the main parasitic parameters in permanent magnet (PM) synchronous machines (PMSMs), cogging torque is the main component of the torque ripple, which has always been the handicap in the high-performance, low-speed drive systems. Over the last two decades, various methods have been proposed to decrease the cogging torque in both radial-flux and axial-flux PMSMs. Among these methods, stator slot skewing, stator tooth notching, permanent magnet (PM) skewing, PM shifting, and pole pairing are extensively investigated. However, little work has been done on reducing the cogging torque of the claw pole machine (CPM), whose cogging torque cannot be ignored. In this paper, the general methods that have been used to reduce the cogging torque in radial-flux and axial-flux PMSMs are developed and verified in a CPM with a soft magnetic composite (SMC) core. The 3-D finite element method (FEM) is used to calculate the cogging torque and PM flux linkage per turn. By comparing different cogging torque reduction technologies, it can be found that the magnet step skewing and unequal claw pole width are very suitable for CPM.
Highlights
As one of main parasitic parameters in permanent magnet synchronous machines (PMSMs), cogging torque is the main component of torque ripple, which has always been the handicap in the high-performance drive applications [1]
The technologies that can be used to reduce the cogging torque of claw pole machine (CPM) include stator pole axial-flux PMSMs, we found that some technologies are not suitable for the CPM, e.g., the stator tooth optimization, stator tooth notching, magnet step skewing, magnet axial pole pairing, and magnet skewing
Since the cogging torque is produced by the interaction between the magnet poles and stator slots, cogging slots, both both the dimensions dimensionsof of the the claw claw pole pole and and the the magnet magnet have have aa great great influence influence on on the thethe cogging slots, both the dimensions of claw the claw andclaw the magnet have a great influence on the cogging torque of Reducing pole arc pole can reduce the torque of torque ofCPMs
Summary
As one of main parasitic parameters in permanent magnet synchronous machines (PMSMs), cogging torque is the main component of torque ripple, which has always been the handicap in the high-performance drive applications [1]. Both the analytical method [6,7] and numerical method [8,9] were used to calculate the cogging torque in PMSMs, and various kinds of technologies were developed to reduce the cogging torque in the radial-flux and axial-flux PMSMs [10,11] These methods can be classified into two ways: one is based on the control method [12], and the other is based on the optimized structure of the PMSM [13]. By comparing the results of various kinds of methods for reducing the cogging torque in CPM, the most suitable method is obtained
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