EPE Association: EPE 2015 - LS6c: Electrical machines

EPE 2015 - LS6c: Electrical machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 04: Electrical Machines and Drive Systems > EPE 2015 - LS6c: Electrical machines

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   Analysis and improvement of a toroidal wound permanent magnet flux-switching machine
By Andreas LINDNER [View]
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Abstract: A 6/8 flux-switching machine with large air-gap and toroidal winding design is presented. The fractional-slot winding of C-core flux-switching machine is wound around the stator yoke instead of the stator pole in this machine design. On the basis of the C-core flux-switching machine several modifications of the stator core shape and of PM arrangement are evaluated by means of 2D Finite Element Analysis. A significant enhancement of the torque capability of the toroidal winding design can be achieved by some minor changes of the stator core shape. Additionally, the application of Halbach shaped magnets leads to even more torque and a reduction of the leakage flux at the stator outer diameter.

   Investigation of Sampling Frequency and Jitter Effects on Transient Current Signal Evaluation for Insulation Condition Monitoring
By Clemens ZOELLER [View]
[Download]

Abstract: The proposed online monitoring method detects insulation defects in a machine by evaluating the currentresponse after a certain voltage step excitation is applied. The transient current response is analyzed todetermine the status of an electrical machine insulation regarding aging, in a longer perspective. Ifinsulation degradation occurs the parasitic winding components (e.g. winding capacitances) have changedand as a consequence the high frequency characteristic. A deviation in the frequency components can beinterpreted as insulation deterioration of the insulation state. This work includes a strategy to improve theperformance of the monitoring method with limited hardware and software resources (e.g. quite lowsampling frequency of ADC units, usage of standard current sensors only). Different test scenariosconducted on a 1.4MW induction machine have been made to prove the applicability.

   Phase Current Harmonics in Transverse Flux Machines: a State Space Representation
By Jan KLÖCK [View]
[Download]

Abstract: Controller design for transverse flux machines is a substantial challenge due to their nonlinear dynamic behavior. This paper places particular emphasis on the phase current control loop since it directly affects the generated torque. A state space representation of phase current harmonics in transverse flux machines is introduced to expand applicable control structures. A speed dependent feedforward controller is combined with a harmonic tracking controller to achieve accuracy and fast dynamic response.

   Two Methods for Compensating Motor-current-sensor Offset Error by using DC-voltage Component Included in Phase-voltage Command for Current-controlled PMSM Drive
By Hiroshi TAMURA [View]
[Download]

Abstract: Offset error of a motor-current sensor varies during motor drive and increases torque ripple. To maintain torque at a high quality, on-line methods for compensating that offset error are required. Accordingly, two methods for compensating offset error by using the DC-voltage components included in phase-voltage commands are proposed and evaluated by experiments and simulation respectively. The evaluation results reveal that the proposed methods can estimate and compensate for the offset error of a motor-current sensor without using motor parameters. The first proposed method (method I) applied to a two-phase-current-detection system was validated by the experimental results. The second proposed method (method II), established by adding an algorithm for estimating a zero-phase-sequence-offset-error component to method I, was evaluated by applying it to a three-phase-current-detection system, and its effectiveness for reducing torque ripple was demonstrated by the simulation results.

EPE 2015 - LS6c: Electrical machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2015 ECCE Europe - Conference > EPE 2015 - Topic 04: Electrical Machines and Drive Systems > EPE 2015 - LS6c: Electrical machines
	[return to parent folder]

	Analysis and improvement of a toroidal wound permanent magnet flux-switching machine By Andreas LINDNER	[View] [Download]
Abstract: A 6/8 flux-switching machine with large air-gap and toroidal winding design is presented. The fractional-slot winding of C-core flux-switching machine is wound around the stator yoke instead of the stator pole in this machine design. On the basis of the C-core flux-switching machine several modifications of the stator core shape and of PM arrangement are evaluated by means of 2D Finite Element Analysis. A significant enhancement of the torque capability of the toroidal winding design can be achieved by some minor changes of the stator core shape. Additionally, the application of Halbach shaped magnets leads to even more torque and a reduction of the leakage flux at the stator outer diameter.

	Investigation of Sampling Frequency and Jitter Effects on Transient Current Signal Evaluation for Insulation Condition Monitoring By Clemens ZOELLER	[View] [Download]
Abstract: The proposed online monitoring method detects insulation defects in a machine by evaluating the currentresponse after a certain voltage step excitation is applied. The transient current response is analyzed todetermine the status of an electrical machine insulation regarding aging, in a longer perspective. Ifinsulation degradation occurs the parasitic winding components (e.g. winding capacitances) have changedand as a consequence the high frequency characteristic. A deviation in the frequency components can beinterpreted as insulation deterioration of the insulation state. This work includes a strategy to improve theperformance of the monitoring method with limited hardware and software resources (e.g. quite lowsampling frequency of ADC units, usage of standard current sensors only). Different test scenariosconducted on a 1.4MW induction machine have been made to prove the applicability.

	Phase Current Harmonics in Transverse Flux Machines: a State Space Representation By Jan KLÖCK	[View] [Download]
Abstract: Controller design for transverse flux machines is a substantial challenge due to their nonlinear dynamic behavior. This paper places particular emphasis on the phase current control loop since it directly affects the generated torque. A state space representation of phase current harmonics in transverse flux machines is introduced to expand applicable control structures. A speed dependent feedforward controller is combined with a harmonic tracking controller to achieve accuracy and fast dynamic response.

	Two Methods for Compensating Motor-current-sensor Offset Error by using DC-voltage Component Included in Phase-voltage Command for Current-controlled PMSM Drive By Hiroshi TAMURA	[View] [Download]
Abstract: Offset error of a motor-current sensor varies during motor drive and increases torque ripple. To maintain torque at a high quality, on-line methods for compensating that offset error are required. Accordingly, two methods for compensating offset error by using the DC-voltage components included in phase-voltage commands are proposed and evaluated by experiments and simulation respectively. The evaluation results reveal that the proposed methods can estimate and compensate for the offset error of a motor-current sensor without using motor parameters. The first proposed method (method I) applied to a two-phase-current-detection system was validated by the experimental results. The second proposed method (method II), established by adding an algorithm for estimating a zero-phase-sequence-offset-error component to method I, was evaluated by applying it to a three-phase-current-detection system, and its effectiveness for reducing torque ripple was demonstrated by the simulation results.