EPE Association: EPE 2011 - LS7e: Topic 10: Motor Design Optimisation

EPE 2011 - LS7e: Topic 10: Motor Design Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - LS7e: Topic 10: Motor Design Optimisation

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   Design Rules for Permanent Magnet Synchronous Machines with Tooth-Coils for Sensorless Control Up to Overload Range
By Andreas EILENBERGER [View]
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Abstract: This paper deals with permanent magnet excited synchronous machines (PMSM) exclusively with tooth-coil winding for sensorless respective encoderless control including overload range. A large number ofwinding conﬁgurations with different fractional slot factors greater and less than 1/3 are analyzed andevaluated for sensorless control and short-circuit capability resulting in construction and design rules forthis kind of PMSMs.

   Optimisation of the Design Parameters of an Asymmetric Brushless DC Motor for Cogging Torque Minimisation
By Paul LEFLEY, Lidija PETKOVSKA, Goga CVETKOVSKI [View]
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Abstract: This paper presents an investigative study into minimising the cogging torque of a novel three phase surface mounted PM brushless DC motor. The motor is novel because it has a non-integer stator-rotor pole ratio and also asymmetric stator pole arcs. In the paper, the results of the work demonstrate how the optimum stator pole asymmetric arc ratio and pole shoe radial depth or thickness can be found to minimise the cogging torque and to maintain a trapezoidal back EMF shape. An accurate 2D finite element modelling FEM software was employed to numerically analyse the magnetic field distribution inside the motor. The aim of the work is to optimise the design parameters for minimising the cogging torque. The results show that there is one stator pole arc ratio and pole shoe depth combination that produces the lowest cogging torque whilst maintaining a near trapezoidal back emf shape.

   The Accuracy of the Classical Machine Phasor Diagram and On-Line Measurements for Permanent Magnet Machines
By Graham MORTON, Calum COSSAR [View]
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Abstract: In this paper test results are presented which explore the accuracy of the classical phasor diagram and on-line measurements for permanent magnet machines. The Jones-Bridge inductance measurement test is described and used to provide synchronous inductance measurements. These are combined with measurements made with a commercial power analyzer and with online parameter estimations, allowing for reconstruction of the phasor diagram. The predicted load angles and terminal voltages are compared to the measured and estimated values, allowing for an evaluation of both the phasor diagram predictions and the estimation techniques. While validating the estimation techniques presented, the results show that the classical phasor diagram does not accurately predict the performance of the permanent magnet machine even at relatively low speed and low current operation. Reasons for this are presented along with suggestions for future work to address this inaccuracy.

EPE 2011 - LS7e: Topic 10: Motor Design Optimisation
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - LS7e: Topic 10: Motor Design Optimisation
	[return to parent folder]

	Design Rules for Permanent Magnet Synchronous Machines with Tooth-Coils for Sensorless Control Up to Overload Range By Andreas EILENBERGER	[View] [Download]
Abstract: This paper deals with permanent magnet excited synchronous machines (PMSM) exclusively with tooth-coil winding for sensorless respective encoderless control including overload range. A large number ofwinding conﬁgurations with different fractional slot factors greater and less than 1/3 are analyzed andevaluated for sensorless control and short-circuit capability resulting in construction and design rules forthis kind of PMSMs.

	Optimisation of the Design Parameters of an Asymmetric Brushless DC Motor for Cogging Torque Minimisation By Paul LEFLEY, Lidija PETKOVSKA, Goga CVETKOVSKI	[View] [Download]
Abstract: This paper presents an investigative study into minimising the cogging torque of a novel three phase surface mounted PM brushless DC motor. The motor is novel because it has a non-integer stator-rotor pole ratio and also asymmetric stator pole arcs. In the paper, the results of the work demonstrate how the optimum stator pole asymmetric arc ratio and pole shoe radial depth or thickness can be found to minimise the cogging torque and to maintain a trapezoidal back EMF shape. An accurate 2D finite element modelling FEM software was employed to numerically analyse the magnetic field distribution inside the motor. The aim of the work is to optimise the design parameters for minimising the cogging torque. The results show that there is one stator pole arc ratio and pole shoe depth combination that produces the lowest cogging torque whilst maintaining a near trapezoidal back emf shape.

	The Accuracy of the Classical Machine Phasor Diagram and On-Line Measurements for Permanent Magnet Machines By Graham MORTON, Calum COSSAR	[View] [Download]
Abstract: In this paper test results are presented which explore the accuracy of the classical phasor diagram and on-line measurements for permanent magnet machines. The Jones-Bridge inductance measurement test is described and used to provide synchronous inductance measurements. These are combined with measurements made with a commercial power analyzer and with online parameter estimations, allowing for reconstruction of the phasor diagram. The predicted load angles and terminal voltages are compared to the measured and estimated values, allowing for an evaluation of both the phasor diagram predictions and the estimation techniques. While validating the estimation techniques presented, the results show that the classical phasor diagram does not accurately predict the performance of the permanent magnet machine even at relatively low speed and low current operation. Reasons for this are presented along with suggestions for future work to address this inaccuracy.