EPE Association: EPE 2013 - LS7e: Synchronous, Permanent Magnet Synchronous and brushless DC motors

EPE 2013 - LS7e: Synchronous, Permanent Magnet Synchronous and brushless DC motors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 10: Electrical machines > EPE 2013 - LS7e: Synchronous, Permanent Magnet Synchronous and brushless DC motors

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   Estimation of Rotor Eddy-Current Losses for High Speed SPMSM.
By Nadhem BOUBAKER, Daniel MATT, Philippe ENRICI, Thierry MARTIRE [View]
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Abstract: Surface-mounted permanent magnet synchronous machine (SPMSM) is widely used in various fieldsdue to its high power density and reliability (compressors, turbine generators …), in our case it isused in aeronautics. However, in high-speed operations eddy-current losses can be important and leadto a damage because of an overheating (PM detachment, demagnetization …). Therefore, it isimportant to estimate these losses during the design phase. This paper describes a technique toestimate rotor eddy-current losses (magnets and sleeve) for the design of 25 kW, 10.5 krpm 3-phasemotor by means of both analytical and finite-element approach. Firstly, we study the spatial variationof the magnetic flux density in the magnets and the sleeve. Consequently, it results a segmentation ofmagnet and sleeve according to the half of slot pitch. Secondly, we estimate the maximum variation ofmagnetic flux density (36 mT in the summit of magnets, 125 mT in the sleeve) by finite-elementanalysis (COMSOL Multiphysics). Finally, this paper presents the result of computation of rotor eddycurrent losses (97 Watt).

   NEW IMPROVED ESTIMATION METHOD FOR AIRGAP SELF AND MUTUAL INDUCTANCE ESTIMATION IN ELECTRIC MACHINES
By Alejandro RODRIGUEZ, Damian GOMEZ, Irma VILLAR, Amaia LOPEZ DE HEREDIA, Ion ETXEBERRIA-OTADUI [View]
[Download]

Abstract: The accurate estimation of the phase inductance is essential for proper machine design and efficient control strategy development. Within this paper two different analytical estimation methods for the airgap self inductance are compared and improved by introducing the airgap mutual inductance. Moreover, a more accurate new expression is proposed where the stator slotting is included. A validation has been carried out with FEM simulations in FLUX2D® where the new method offers 20\% more accurate results than those achieved with other methods proposed in the literature.

   Proposal with 2D FEM analysis of a six phase, 12 poles, 3kW, 200 rpm BLDC Multiphase Reluctance Machine wind generator
By Dragos URSU, Lucian TUTELEA, Ion BOLDEA [View]
[Download]

Abstract: In an effort to introduce a low cost (PM less), low power electric wind generator, this paper reports on preliminary design aspects and FEM analysis of a 3kW, 200 rpm, BLDC Multiple Phase Reluctance generator. After checking the degree of saturation at maximum imposed current density (a quite low value due to natural cooling conditions) and the obtainable electromagnetic torque, normal and transient inductances are computed in order to be used in a control strategy. A transient FEM electromagnetic solver simulates the machine at the synchronous speed with normal and half a slot skewed ALA rotor, confirming electric power generation capability of this machine at above 80 \% efficiency (at 3.5 Nm/kg) and good inverter voltage utilization.

EPE 2013 - LS7e: Synchronous, Permanent Magnet Synchronous and brushless DC motors
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 10: Electrical machines > EPE 2013 - LS7e: Synchronous, Permanent Magnet Synchronous and brushless DC motors
	[return to parent folder]

	Estimation of Rotor Eddy-Current Losses for High Speed SPMSM. By Nadhem BOUBAKER, Daniel MATT, Philippe ENRICI, Thierry MARTIRE	[View] [Download]
Abstract: Surface-mounted permanent magnet synchronous machine (SPMSM) is widely used in various fieldsdue to its high power density and reliability (compressors, turbine generators …), in our case it isused in aeronautics. However, in high-speed operations eddy-current losses can be important and leadto a damage because of an overheating (PM detachment, demagnetization …). Therefore, it isimportant to estimate these losses during the design phase. This paper describes a technique toestimate rotor eddy-current losses (magnets and sleeve) for the design of 25 kW, 10.5 krpm 3-phasemotor by means of both analytical and finite-element approach. Firstly, we study the spatial variationof the magnetic flux density in the magnets and the sleeve. Consequently, it results a segmentation ofmagnet and sleeve according to the half of slot pitch. Secondly, we estimate the maximum variation ofmagnetic flux density (36 mT in the summit of magnets, 125 mT in the sleeve) by finite-elementanalysis (COMSOL Multiphysics). Finally, this paper presents the result of computation of rotor eddycurrent losses (97 Watt).

	NEW IMPROVED ESTIMATION METHOD FOR AIRGAP SELF AND MUTUAL INDUCTANCE ESTIMATION IN ELECTRIC MACHINES By Alejandro RODRIGUEZ, Damian GOMEZ, Irma VILLAR, Amaia LOPEZ DE HEREDIA, Ion ETXEBERRIA-OTADUI	[View] [Download]
Abstract: The accurate estimation of the phase inductance is essential for proper machine design and efficient control strategy development. Within this paper two different analytical estimation methods for the airgap self inductance are compared and improved by introducing the airgap mutual inductance. Moreover, a more accurate new expression is proposed where the stator slotting is included. A validation has been carried out with FEM simulations in FLUX2D® where the new method offers 20\% more accurate results than those achieved with other methods proposed in the literature.

	Proposal with 2D FEM analysis of a six phase, 12 poles, 3kW, 200 rpm BLDC Multiphase Reluctance Machine wind generator By Dragos URSU, Lucian TUTELEA, Ion BOLDEA	[View] [Download]
Abstract: In an effort to introduce a low cost (PM less), low power electric wind generator, this paper reports on preliminary design aspects and FEM analysis of a 3kW, 200 rpm, BLDC Multiple Phase Reluctance generator. After checking the degree of saturation at maximum imposed current density (a quite low value due to natural cooling conditions) and the obtainable electromagnetic torque, normal and transient inductances are computed in order to be used in a control strategy. A transient FEM electromagnetic solver simulates the machine at the synchronous speed with normal and half a slot skewed ALA rotor, confirming electric power generation capability of this machine at above 80 \% efficiency (at 3.5 Nm/kg) and good inverter voltage utilization.