Steady-state performance of a line-start synchronous reluctance motor with capacitive assistance

Emeka, S.

doi:10.1016/j.epsr.2010.04.004

Cited by 17 publications

(17 citation statements)

References 23 publications

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“…In (5), L SS is the 3 × 3 inductance matrix of the stator three-phase winding in the salient pole half of the machine, L RR is the 3 × 3 inductance matrix of the round rotor part of the machine. Each of L SS and L RR has their respective leakage parts in the appropriate places as in (6) and (8). On account of the assumption that the main and auxiliary windings are identical and both are mutually coupled and occupy the same slot positions, it follows that the mutual inductance between the two sets of windings are also equal.…”

Section: Machine Model Developmentmentioning

confidence: 99%

“…Note that the auxiliary winding voltage equations have additional terms V cd and V cq added to them to account for the capacitor connected across it. In the d-q rotor reference frame, they are given by Obe [8]a s dV…”

Section: Machine Model Developmentmentioning

confidence: 99%

“…Sequel to this, the authors of this paper undertook the investigation of capacitor-assisted synchronous reluctance machines to ascertain the possibility of mitigating some of the key inherent deficiencies stated above. In [6][7][8], Obe and co-workers reported a replica of the Wanlass scheme as applied to line-start synchronous reluctance machines. This machine was seen to provide very good power factors especially at low load angles with reduced total losses at certain capacitance values.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio

Anih¹,

Emeka²,

Abonyi³

2015

IET Electric Power Applications

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Analytical and experimental studies of a hybridised synchronous reluctance machine with a variable X d /X q ratio characteristic is the subject of this study. The machine comprises a round rotor and a salient pole machine element that is mechanically coupled together and integrally wound. There are two sets of poly-phase windings in each stator. The windings of one of the sets are transposed between the two sections of the machine. Either set of the windings may be connected to the supply while the other feeds a balanced capacitance load. It is shown that by tuning of the capacitance load that the X d /X q ratio varies theoretically from zero to infinity at very good power factors. The machine characteristics were verified using the generalised two-axis theory and validated by experimentation. The experimental and analytical results obtained show good agreement. Saturation was investigated by using the variation of the d-axis inductance with machine loading. A set of rotor windings may be introduced for the purpose that the machine be self-starting and self-synchronising as a motor. The rotor field windings when fed with dc, will make the machine also capable of operation as a stand-alone salient-pole generator. For this purpose, it was shown that for a very high saliency ratio, reluctance power can be considerably higher than the excitation power.

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Section: Machine Model Developmentmentioning

confidence: 99%

Section: Machine Model Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio

Anih¹,

Emeka²,

Abonyi³

2015

IET Electric Power Applications

Self Cite

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“…The power factor should be taken into account due to the increased reactive component of the current, which contributes significantly to the increase of the total current. In [44][45][46], it is noted that LS-SynRM has a small power factor, which can lead to losses in the power supply cable. Since the motors studied in this article have different values of the power factor, not only their efficiency but also their influence of the power factor on losses in the power supply cable is taken into account when comparing their energy consumption.…”

Section: Introductionmentioning

confidence: 99%

Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses

et al. 2020

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The paper presents a comparative analysis of life-cycle energy consumption for three different types of 4 kW line-start motors used in a pump unit with throttling: the most widely used induction motor with IE3 efficiency class, line start permanent magnet synchronous motor with IE4 efficiency class and line start synchronous reluctance motor with IE4 efficiency class. The operating cycle for pump units with constant flow is considered for the above-mentioned types of motors taking into account not only the losses in the pump and motor, but also in the power supply cable. It is shown that the line start synchronous reluctance motor without magnets has the highest efficiency over the entire considered loading range. However, its power factor is lower than that of the synchronous motor with magnets and therefore it has more significant losses in power supply cable. Despite this disadvantage, the line-start reluctance motor is a good alternative to widespread induction motor since it allows saving of approximately 4000 euro more than the latter during the 20 years life cycle. It also provides similar savings in comparison to the permanent magnet synchronous motor, but unlike it, it does not have costly rare-earth materials in the rotor.

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“…This is because, if the capacitor is connected in series with a single-winding machine, it will reduce the machine reactance, allowing the machine to draw excessive currents and if connected in parallel, it will minimally improve the power factor of the source and not the internal power factor of the machine itself [8,9]. A capacitor connected to a second winding can be tuned to obtain the desired machine characteristics while meeting the current carrying capability limit of the windings.…”

Section: Model Of the Enhanced Machine Model Of The Enhanced Machine mentioning

confidence: 99%

Enhancement of the Performance of a Transfer Field Electric Machine Operating in the Asynchronous Mode

Obe

Anih

2014

Nig. J. Tech.

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ABSTRACT ABSTRACTThis paper re This paper re This paper re This paper reports the enhancement of the ou ports the enhancement of the ou ports the enhancement of the ou ports the enhancement of the ou the asynchronous mode by direct capacitance injection into the auxiliary winding of the machine, which is the asynchronous mode by direct capacitance injection into the auxiliary winding of the machine, which is the asynchronous mode by direct capacitance injection into the auxiliary winding of the machine, which is the asynchronous mode by direct capacitance injection into the auxiliary winding of the machine, which is electrically isolated from the main winding but magnetically coupled to it. It is shown electrically isolated from the main winding but magnetically coupled to it. It is shown electrically isolated from the main winding but magnetically coupled to it. It is shown electrically isolated from the main winding but magnetically coupled to it. It is shown injected capacit injected capacit injected capacit injected capacitance, the ance, the ance, the ance, the torque and output power of the machine is markedly enhanced at improved power factor. torque and output power of the machine is markedly enhanced at improved power factor. torque and output power of the machine is markedly enhanced at improved power factor. torque and output power of the machine is markedly enhanced at improved power factor. With the enhanced output power achievable by capacitance injection, the transfer field machine can compare With the enhanced output power achievable by capacitance injection, the transfer field machine can compare With the enhanced output power achievable by capacitance injection, the transfer field machine can compare With the enhanced output power achievable by capacitance injection, the transfer field machine can compare favorably favorably favorably favorably with an equivalent induction motor except t with an equivalent induction motor except t with an equivalent induction motor except t with an equivalent induction motor except t frequency of the stator mmf wave (ω frequency of the stator mmf wave (ω frequency of the stator mmf wave (ω frequency of the stator mmf wave (ωr r r r = = = =

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Steady-state performance of a line-start synchronous reluctance motor with capacitive assistance

Cited by 17 publications

References 23 publications

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio

Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses

Enhancement of the Performance of a Transfer Field Electric Machine Operating in the Asynchronous Mode

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Steady-state performance of a line-start synchronous reluctance motor with capacitive assistance

Cited by 17 publications

References 23 publications

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X d / X q ratio

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X d / X q ratio

Life Cycle Energy Cost Assessment for Pump Units with Various Types of Line-Start Operating Motors Including Cable Losses

Enhancement of the Performance of a Transfer Field Electric Machine Operating in the Asynchronous Mode

Contact Info

Product

Resources

About

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio

Modelling and performance of a hybrid synchronous reluctance machine with adjustable X _d / X _q ratio