High-grade control of switched reluctance machines

Kjær, P.C.; Gribble, J.J.; Miller, Tim

doi:10.1109/28.649972

Cited by 127 publications

(29 citation statements)

References 11 publications

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“…The voltage profile at [θ off , 30º] is also flat and equal to -u r ; this condition ensures that the freewheeling current drops to zero as quickly as possible. This feature can also be seen in [3] and [11]. In [3], a method was proposed to expand the operation range of STO without considering the winding resistor.…”

Section: F Commonality Of Tsf Optmentioning

confidence: 94%

“…This feature can also be seen in [3] and [11]. In [3], a method was proposed to expand the operation range of STO without considering the winding resistor. In [11], a commercial numerical routine (NAG library) was utilized to optimize TSF.…”

Section: F Commonality Of Tsf Optmentioning

confidence: 94%

“…The peaks and rates of the change in reference currents were reduced; thus, a wider operation range was achieved. A critical angle at which two adjacent phases can produce the same torque with the same flux linkage was set as the commutation point in [2] and [3]; consequently, a large operational range of STO was realized. However, the effect of the winding resistor on the supply voltage was not considered.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Smooth Torque Speed Characteristic of Switched Reluctance Motors

Zeng

Chen²,

Chen

2014

Journal of Power Electronics

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The torque ripple of switched reluctance motors (SRMs) is the main disadvantage that limits the industrial application of these motors. Although several methods for smooth-toque operation (STO) have been proposed, STO works well only within a certain torque and speed range because of the constraints of the supply voltage and peak current. Based on previous work that sought to expand the STO range, a scheme is developed in this study to determine the maximum smooth torque range at each speed. The relationship between the maximum smooth torque and speed is defined as the smooth torque speed characteristics (STSC), a concept similar to torque speed characteristics (TSC). STSC can be utilized to evaluate torque utilization by comparing it with TSC. Thus, the concept benefits the special design of SRMs, especially for the generation of smooth torque. Furthermore, the torque sharing function (TSF) derived from the proposed method can be applied to STO, which produces a higher smooth torque over a wider speed range in contrast to four typical TSFs. TSimulation and experimental results verify the proposed method.

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Section: F Commonality Of Tsf Optmentioning

confidence: 94%

Section: F Commonality Of Tsf Optmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Smooth Torque Speed Characteristic of Switched Reluctance Motors

Zeng

Chen²,

Chen

2014

Journal of Power Electronics

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“…Since different current waveforms can deliver constant torque for the same operating point, additional requirements can be considered, e.g. minimized rms current, which is similar to maximum-torque-per-ampere (MTPA) techniques for rotating field machines, or minimized flux and accordingly minimized iron losses (maximum-torque-perflux-MTPF) [97], [98].…”

Section: B Torque Controlmentioning

confidence: 99%

Technology, Research and Applications of Switched Reluctance Drives

et al. 2017

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Abstract-Electrical drives are one of the major consumers of electrical energy and their penetration in the market is still growing. Hence, for many drive applications efficient, reliable and cost effective solutions have to be found. Switched reluctance drives (SRD) offer a potential solution when focus is mainly on cost and robustness. However, to benefit from the unique advantages of this machine type a deep understanding of its strongly non-linear behavior is required. After discussing some major differences to classic rotating field machines, this paper presents a broad overview of the state of the art of SRD taking into consideration all aspects relevant to machine modeling, design and control development process. Finally, applications on the market utilizing SRDs and the focus of current research is presented. After reading this paper the reader will be able to assess if this modern drive technology could be advantagous in a given application.

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“…The balanced TSF introduced in [6] considered the commutation center at the position of i c q , where two adjacent phases have the same torque at the same phase current. [11], [12] suggested changing the commutation center from i c q to l q c with the increase in speed. Turn-on and turn-off angle controls were also considered in [13] to minimize torque ripples.…”

Section: Introductionmentioning

confidence: 99%

Copper Loss and Torque Ripple Minimization in Switched Reluctance Motors Considering Nonlinear and Magnetic Saturation Effects

Dowlatshahi¹,

Saghaian-Nejad²,

Ahn³

et al. 2014

Journal of Power Electronics

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The discrete torque generation mechanism and inherently nonlinear magnetic characterization of switched reluctance motors lead to unacceptable torque ripples and limit the application of these motors. In this study, a phase current profiling technique and torque sharing function are proposed in consideration of magnetic saturation effects and by minimizing power loss in the commutation area between the adjacent phases. Constant torque trajectories are considered in incoming and outgoing phase current planes based on nonlinear T-i-theta curves obtained from experimental measurements. Optimum points on constant torque trajectories are selected by improving drive efficiency and minimizing copper loss in each rotor position. A novel analytic invertible function is introduced to express phase torque based on rotor position and its corresponding phase current. The optimization problem is solved by the proposed torque function, and optimum torque sharing functions are derived. A modification method is also introduced to enhance the torque ripple-free region based on simple logic rules. Compared with conventional torque sharing functions, the resultant reference current from the proposed method has less peak and effective values and exhibits lower copper loss. Experimental and simulation results from a four-phase 4 KW 8/6 SRM validate the effectiveness of the proposed method.

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High-grade control of switched reluctance machines

Cited by 127 publications

References 11 publications

Smooth Torque Speed Characteristic of Switched Reluctance Motors

Smooth Torque Speed Characteristic of Switched Reluctance Motors

Technology, Research and Applications of Switched Reluctance Drives

Copper Loss and Torque Ripple Minimization in Switched Reluctance Motors Considering Nonlinear and Magnetic Saturation Effects

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