EPE Association: EPE 2020 - DS3g-1: Electrical Machines-1

EPE 2020 - DS3g-1: Electrical Machines-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 04: Electrical Machines and Drive Systems > EPE 2020 - DS3g-1: Electrical Machines-1

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   Characteristics of an integrated motor controlled independently by multi-inverters to achieve high efficiency and a wide speed range
By Kazuto SAKAI [View]
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Abstract: For electric vehicles, motor operation is achieved by using a highly efficient variable-speed drive. Inthis paper, we describe the characteristics of a novel motor capable of pole and phase changes; it is ahigh-performance motor because it has multiple windings combined with multi-inverters. The polechanges will allow the motor to operate with a large torque at a low speed by using a small number of poles; the motor can operate at high efficiency at high speeds by using a large number of poles. The motor had three groups of three-phase windings consisting of 18 coils. One group of the three-phase windings was consisted of 6 coils. Three three-phase inverters that connected the three groups of three-phase windings directly controlled the current phase of each winding, which helped change the number of poles and phases. The results of our analyses confirmed that the motor produced a large torque at a low speed of 3000 rpm for the eight-pole mode, and operated with a high efficiency of approximately 96\% at a high speed of 6000 rpm for the four-pole mode.

   Intelligent High Current Sensor for Various Frequency
By Bohumil SKALA [View]
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Abstract: The paper proposes a design procedure of a current sensor. The winding design is analyzed regardingits impact on the operational characteristics and is evaluated for a preferred application. The paper alsodiscusses the measurement results and given frequency characteristic and quality factors of thelaboratory prototypes.The sensor is designed for a current up to 200 A and frequency up to 120 kHz. The sensor is equippedwith an electronic unit in a common housing. The electronic transducer evaluated the measured dataand produces the digital output signals which is easy to transfer even to a long distance.

   On the Influence of the Stator Winding Topology on the Electromagnetic Emissions of Fractional Horsepower BLDC Motors
By Felix KRALL [View]
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Abstract: Due to the increasing number of electronic devices in the automotive sector, the electromagnetic compatibility (EMC) of auxiliary drives has become increasingly important in recent years. This paper investigates the influence of the three different winding topologies monofilar, bifilar and bifilar twisted on the EMC performance of fractional horsepower (FHP) brushless DC (BLDC) motors. The main coupling path of the motor for the radiated emissions is the parasitic coupling capacitance C$\_{\text{p}}$ of the stator lamination stack and the motor winding. The comparison of EMC measurements carried out in a shielded chamber show the influence of this coupling. A decreased coupling reduces the radiated emissions by 5\,dB$\_{\upmu \text{V/m}}$ over a wide frequency range. If the excitation of this coupling path is also decreased, the radiated emissions decline by almost 10\,dB$\_{\upmu \text{V/m}}$. This allows the necessary EMC filter's size to be reduced.

   Theory of Influencing the Breathing Mode and Torque Pulsations of Permanent Magnet Electric Machines with Harmonic Currents
By Jan ANDRESEN [View]
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Abstract: This paper analytically demonstrates how both breathing mode and torque pulsations can be independently influenced in permanent magnet synchronous machines. This is achieved through superimposing an alternating magnetomotive force component on the pre-existing magnetomotive force in the dq-coordinate system. An FEM simulation is used to validate the results.

EPE 2020 - DS3g-1: Electrical Machines-1
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2020 ECCE Europe - Conference > EPE 2020 - Topic 04: Electrical Machines and Drive Systems > EPE 2020 - DS3g-1: Electrical Machines-1
	[return to parent folder]

	Characteristics of an integrated motor controlled independently by multi-inverters to achieve high efficiency and a wide speed range By Kazuto SAKAI	[View] [Download]
Abstract: For electric vehicles, motor operation is achieved by using a highly efficient variable-speed drive. Inthis paper, we describe the characteristics of a novel motor capable of pole and phase changes; it is ahigh-performance motor because it has multiple windings combined with multi-inverters. The polechanges will allow the motor to operate with a large torque at a low speed by using a small number of poles; the motor can operate at high efficiency at high speeds by using a large number of poles. The motor had three groups of three-phase windings consisting of 18 coils. One group of the three-phase windings was consisted of 6 coils. Three three-phase inverters that connected the three groups of three-phase windings directly controlled the current phase of each winding, which helped change the number of poles and phases. The results of our analyses confirmed that the motor produced a large torque at a low speed of 3000 rpm for the eight-pole mode, and operated with a high efficiency of approximately 96\% at a high speed of 6000 rpm for the four-pole mode.

	Intelligent High Current Sensor for Various Frequency By Bohumil SKALA	[View] [Download]
Abstract: The paper proposes a design procedure of a current sensor. The winding design is analyzed regardingits impact on the operational characteristics and is evaluated for a preferred application. The paper alsodiscusses the measurement results and given frequency characteristic and quality factors of thelaboratory prototypes.The sensor is designed for a current up to 200 A and frequency up to 120 kHz. The sensor is equippedwith an electronic unit in a common housing. The electronic transducer evaluated the measured dataand produces the digital output signals which is easy to transfer even to a long distance.

	On the Influence of the Stator Winding Topology on the Electromagnetic Emissions of Fractional Horsepower BLDC Motors By Felix KRALL	[View] [Download]
Abstract: Due to the increasing number of electronic devices in the automotive sector, the electromagnetic compatibility (EMC) of auxiliary drives has become increasingly important in recent years. This paper investigates the influence of the three different winding topologies monofilar, bifilar and bifilar twisted on the EMC performance of fractional horsepower (FHP) brushless DC (BLDC) motors. The main coupling path of the motor for the radiated emissions is the parasitic coupling capacitance C$\_{\text{p}}$ of the stator lamination stack and the motor winding. The comparison of EMC measurements carried out in a shielded chamber show the influence of this coupling. A decreased coupling reduces the radiated emissions by 5\,dB$\_{\upmu \text{V/m}}$ over a wide frequency range. If the excitation of this coupling path is also decreased, the radiated emissions decline by almost 10\,dB$\_{\upmu \text{V/m}}$. This allows the necessary EMC filter's size to be reduced.

	Theory of Influencing the Breathing Mode and Torque Pulsations of Permanent Magnet Electric Machines with Harmonic Currents By Jan ANDRESEN	[View] [Download]
Abstract: This paper analytically demonstrates how both breathing mode and torque pulsations can be independently influenced in permanent magnet synchronous machines. This is achieved through superimposing an alternating magnetomotive force component on the pre-existing magnetomotive force in the dq-coordinate system. An FEM simulation is used to validate the results.