Expansion of the Feasible Slot/Pole Combinations in the Fractional Slot PM Machines by Applying Three-Slot Pitch Coils

Jalali, Pezhman; Boroujeni, Samad Taghipour; Khoshtarash, Javad

doi:10.1109/tec.2018.2871889

Cited by 23 publications

(8 citation statements)

References 13 publications

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“…It is possible to design fractional-slot windings with too many different combinations of numbers of poles and slots [14,[34][35][36][37][38][39][40]. But here, in order to take into account the effects of slot numbers and winding topologies on the MMF and consequently, electromagnetic performance, five famous windings with the pole numbers equal to 10 are of concern.…”

Section: Original Windingsmentioning

confidence: 99%

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Araghi

Kiyoumarsi

Dehkordi

2022

IET Electric Power Appl

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Fractional‐slot concentrated‐windings are appreciated for their simple construction, short end‐winding length, high copper fill factor, low cogging torque, good field‐weakening capability and fault‐tolerant ability. However, in comparison to the conventional distributed windings, the fractional‐slot concentrated‐windings are characterised with high space magnetomotive force (MMF) harmonics, which results in undesirable effects on the machine performance, such as localised core saturation, eddy current loss in the rotor and noise and vibration. In order to improve winding characteristics, several techniques have been developed recently. This manuscript introduces the 5 new winding topologies by using the general concept of stator slot shifting. It means that, in order to cancel undesirable MMF harmonics, by doubling (or tripling or even multiplying) the slot number and dividing the winding and then relatively shifting the winding by one (or more) slots, the undesirable harmonics have been eliminated effectively. The best choice is chosen according to the lowest amount of the MMF harmonic, highest value of winding factor and torque desirable characteristics. At the end, comprehensive comparisons for the designed synchronous reluctance motor (SynRel) equipped with proposed windings and also distributed winding are presented. The analytical study and 2D FEM analysis results show that it is possible to get an ideal low space‐harmonic winding topology, and consequently, a low torque ripple for these motors.

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Section: Original Windingsmentioning

confidence: 99%

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Araghi

Kiyoumarsi

Dehkordi

2022

IET Electric Power Appl

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“…Actually, the pole/slot combination in the SPM machine and the stator‐/rotor‐teeth number in the FSPM defines the machine periodicity. In comparison with the integral‐slot SPM machines, in the existing fractional‐slot SPM machines, the machine periodicity its CTP and, consequently, the cogging torque is small [5]. Similarly, the proposed FSPM machines in the literature have a fractional ratio between the stator and the rotor teeth [20].…”

Section: Aim and Scopementioning

confidence: 99%

“…However, the used techniques for reducing the machine cogging torque could be applied for increasing it too. The most effective parameter on the machine cogging torque is the combination of the machine slots and poles [5]. However, other design parameters, such as the slot opening and the geometry [6] and the shape [7] of the PMs have significant influences on the machine cogging torque.…”

Section: Introductionmentioning

confidence: 99%

Using and enhancing the cogging torque of PM machines in valve positioning applications

Boroujeni

Takorabet

Mezani

et al. 2020

IET Electric Power Applications

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In this study, it is aimed to use the cogging torque of permanent magnet (PM) machines for providing the load torque in the valve positioning applications. The policy is to use the machine cogging torque to overcome the load torque at the steady‐state condition (fixed valve position). Therefore, there is no excitation, and no armature Joule losses at the steady‐state condition and consequently lower thermal stress for the machine. To have a more compact actuator, it is tried to increase the machine cogging torque. Two well‐known types of PM machines, i.e. surface‐mounted PM (SPM) and flux‐switching PM (FSPM) machines are studied to be applied in this application. Some techniques such as applying auxiliary slots and PM segmentation (for the SPM machine) and two‐part rotor topology (for both SPM and FSPM machines) are proposed to increase the machine cogging torque. The impact of each technique on the developed cogging torque is studied by means of finite element analysis. Finally, the SPM and FSPM machines are compared together in the terms of the torque density. The validity of the proposed concept of providing the load torque by the cogging torque is investigated by experimental tests.

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“…In general, these methods can be classified into two categories: optimizing the motor structure and using harmonic suppression algorithms. From the view of motor structure optimization, skewing the stator slot or rotor magnet (Dong et al, 2019), using fractional slot (Peng et al, 2019), selecting optimal slot and pole ratio (Jalali et al, 2019), and other motor design optimization can reduce cogging torque and then suppress current harmonics. Although these methods are effective, the complexity of the motor design and production is increased significantly, eventually leads to a higher cost.…”

Section: Introductionmentioning

confidence: 99%

Current harmonic suppression for permanent magnet synchronous motor based on phase compensation resonant controller

Cui

Zheng

Zhou

et al. 2020

Journal of Vibration and Control

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Permanent magnet synchronous motor always suffers from air gap field distortion and inverter nonlinearity, which lead to the harmonic components in motor currents. A resonant controller is a remarkable control method to eliminate periodic disturbance, whereas the conventional resonant controller is limited by narrow bandwidth and phase lag. This article presents a novel resonant controller with a precise phase compensation method for a permanent magnet synchronous motor to suppress the current harmonics. Based on the analysis of the current harmonic characteristics, the proposed resonant controller for rejecting a set of selected current harmonic components is plugged in the current loop, and it is parallel to the traditional proportional–integral controller. Furthermore, the stability analysis of the proposed resonant controller is investigated, and the parameters are tuned to get a satisfactory performance. Compared with the conventional resonant controller, the proposed resonant controller can achieve good steady-state performance, dynamic performance, and frequency adaptivity performance, simultaneously. Finally, the experimental results demonstrate the effectiveness of the proposed suppression scheme.

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Expansion of the Feasible Slot/Pole Combinations in the Fractional Slot PM Machines by Applying Three-Slot Pitch Coils

Cited by 23 publications

References 13 publications

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Using and enhancing the cogging torque of PM machines in valve positioning applications

Current harmonic suppression for permanent magnet synchronous motor based on phase compensation resonant controller

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