Reducing the cogging torque of PM Transverse Flux Machines by discrete skewing of a segmented stator

Dreher, Florian; Parspour, Nejila

doi:10.1109/icelmach.2012.6349908

Cited by 23 publications

(15 citation statements)

References 1 publication

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“…The circular magnets have a high possibility of lessening the cogging torque in the TFPM machine. The core skewing with unequal distribution is discussed in [129]. The skewing is responsible for more than 80% reduction in cogging torque.…”

Section: G Cogging Torquementioning

confidence: 99%

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

et al. 2020

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Transverse flux permanent magnet (TFPM) machines are a potential candidate for directdrive wind power application due to high torque and power densities. The operating principle of TFPM machines is firstly described with various topologies available in literature, with the placement of magnets as a criterion for the classification of TFPM machine topologies. This review includes characteristics, power factor improvement, cogging torque minimization, material consideration, modelling techniques, and scalability. Different wind turbine concepts with direct-drive machines, control techniques and power converter topologies are also considered in this paper. INDEX Permanent magnet, topologies, transverse flux, and wind power.

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Section: G Cogging Torquementioning

confidence: 99%

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

et al. 2020

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“…Skewing a permanent magnet rotor creates manufacturing complexity, particularly when there is a high pole number. The stator of a TFM can be skewed along its axial direction [7] or pitched by alternating the tooth space over two -or more -poles in the radial plane [8] to reduce the ripple effects. The former would require a complicated arrangement of laminates or, if SMC were to be used, a method of pressing the SMC components such that the pressure is even over the skew length where care must be taken with the tooth edges, which are prone to fragmenting.…”

Section: First Prototype: Smc-laminatementioning

confidence: 99%

Comparison of two transverse flux machines for an aerospace application

Jordan

Baker

2017

2017 IEEE International Electric Machines and Drives Conference (IEMDC)

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“…In [12], the radially skewed and unequally distributed configurations of armature cores were introduced to decrease the most dominant components in high cogging torque. Moreover, the discrete skewing of a segmented stator was presented in [13]. Additionally, some researchers tried to suppress torque ripple by shifting stator or rotor.…”

Section: Introductionmentioning

confidence: 99%

Torque Ripple Suppression of Building-Block Transverse Flux Permanent Magnet Motor by Current Compensation and Variable Parameter Control Based on Real-Time Inductance

2020

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Building-block transverse flux permanent magnet motor (B-TFPMM) has the advantage of electromagnetic decoupling and high torque density, but it has the strong nonlinearity and the large torque ripple. To solve the problem, the nonlinear characteristics of B-TFPMM stator back electromotive force (EMF) e pm , winding inductance L and single-phase torque T sp are analyzed firstly, and the nonlinear dynamic models involving e pm , L, T sp , stator current and rotor position are established by three-dimensional finite element method (3DFEM). Secondly, apply the square wave current and sinusoidal current to stator windings respectively, and the result shows that using sinusoidal current would acquire smaller torque ripple rate when the load torque is more than 30 N • m. Furthermore, the variation rule of five-phase current utilization is obtained and the maximum current utilization model is established. Based on these, the current compensation method is developed and then the torque ripple rate could be reduced by 10% approximately. After that, combining with 7 nonlinear dynamic models of B-TFPMM, a closed-loop control system based on the compensation method and variable parameter PID algorithm is built. The ratio of the real-time winding inductance to sampling period is chosen as the proportional coefficient of controller. The results indicate that compared with the control mode which combining uncompensated current and traditional constant parameter PID algorithm, the control mode of using compensated current and variable parameter PID algorithm would reduce the torque ripple rate by 57% to 65% and increase the average torque by 13% to 33% in the meantime. INDEX TERMS Building-block transverse flux permanent magnet motor, torque ripple suppression, current compensation, nonlinear dynamic model, variable parameter control.

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Reducing the cogging torque of PM Transverse Flux Machines by discrete skewing of a segmented stator

Cited by 23 publications

References 1 publication

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

A Review on Transverse Flux Permanent Magnet Machines for Wind Power Applications

Comparison of two transverse flux machines for an aerospace application

Torque Ripple Suppression of Building-Block Transverse Flux Permanent Magnet Motor by Current Compensation and Variable Parameter Control Based on Real-Time Inductance

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