EPE Association: EPE 2022 - LS1e: Adjustable-Speed Drives and Converter-Machine Interactions

EPE 2022 - LS1e: Adjustable-Speed Drives and Converter-Machine Interactions
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 05: Renewable Energy Power Systems > EPE 2022 - LS1e: Adjustable-Speed Drives and Converter-Machine Interactions

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   A Case Study of Pole-Phase Changing Induction Machine Performance
By Konstantina BITSI [View]
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Abstract: Pole-phase changing (PPC) induction machines (IMs) can achieve improved ef_ciency as well as wider torque-speed range compared to their _xed pole-phase counterparts. In this paper, a 4-pole IM is designed and evaluated in terms of its pole-phase changing performance.

   Impact of Insulation and Cooling on Performance due to Reliability-Oriented Design of Electrical Machines
By Lucas HANISCH [View]
[Download]

Abstract: In this paper, a multiphysics model of a permanent magnet synchronous motor (PMSM) is created toinvestigate the influence of the cooling and insulation system on the temperature distribution and performance of the machine. In thermal computer fluid dynamic (CFD) studies, the influence of the coolant flow, the winding head impregnation and the insulation paper on the temperature distribution of the machine is investigated. Finally, the influence of thermal effects on the steady-state limit torque of the machine is evaluated. It is systematically shown that insulation materials with high thermal conductance allow torque increases of about 3.3\%. Torque can be increased by about 1.9\% per reduced 0.1 mm insulation thickness of the slot liner. Alternatively, the temperature impact on insulation can be reduced at constant torque leading to improved insulation lifetime and reliability.

   Influence of static rotor imbalance on the roller bearing damage due to inverter-induced bearing currents
By Martin WEICKER [View]
[Download]

Abstract: The influence of static rotor imbalance on the generation of bearing fluting due to bearing currents is experimentally investigated. For that six inverter-fed induction machines with the rated power of 1.5_kW and three with the rated power of 11_kW were tested with especially prepared bearings. The machines were operated with three different static rotor imbalances (U0, U1, U2) to test the imbalance influence on the fluting effect due to discharge and rotor-to-ground bearing currents. The damaging effect of inverter-induced bearing currents is influenced by the parameters 'rotor speed', 'bearing temperature', 'bearing grease' and 'grounding conditions' of the inverter-motor-system. The impact of a static rotor imbalance on the damaging process caused by the parasitic bearing currents is so far unknown. Therefore it shall be clarified, if the combination of static rotor imbalance and bearing currents may damage the bearing raceway surfaces much faster than without imbalance. As a concluding result our test procedures showed no acceleration of bearing deterioration due to static rotor imbalances.

EPE 2022 - LS1e: Adjustable-Speed Drives and Converter-Machine Interactions
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 05: Renewable Energy Power Systems > EPE 2022 - LS1e: Adjustable-Speed Drives and Converter-Machine Interactions
	[return to parent folder]

	A Case Study of Pole-Phase Changing Induction Machine Performance By Konstantina BITSI	[View] [Download]
Abstract: Pole-phase changing (PPC) induction machines (IMs) can achieve improved ef_ciency as well as wider torque-speed range compared to their _xed pole-phase counterparts. In this paper, a 4-pole IM is designed and evaluated in terms of its pole-phase changing performance.

	Impact of Insulation and Cooling on Performance due to Reliability-Oriented Design of Electrical Machines By Lucas HANISCH	[View] [Download]
Abstract: In this paper, a multiphysics model of a permanent magnet synchronous motor (PMSM) is created toinvestigate the influence of the cooling and insulation system on the temperature distribution and performance of the machine. In thermal computer fluid dynamic (CFD) studies, the influence of the coolant flow, the winding head impregnation and the insulation paper on the temperature distribution of the machine is investigated. Finally, the influence of thermal effects on the steady-state limit torque of the machine is evaluated. It is systematically shown that insulation materials with high thermal conductance allow torque increases of about 3.3\%. Torque can be increased by about 1.9\% per reduced 0.1 mm insulation thickness of the slot liner. Alternatively, the temperature impact on insulation can be reduced at constant torque leading to improved insulation lifetime and reliability.

	Influence of static rotor imbalance on the roller bearing damage due to inverter-induced bearing currents By Martin WEICKER	[View] [Download]
Abstract: The influence of static rotor imbalance on the generation of bearing fluting due to bearing currents is experimentally investigated. For that six inverter-fed induction machines with the rated power of 1.5_kW and three with the rated power of 11_kW were tested with especially prepared bearings. The machines were operated with three different static rotor imbalances (U0, U1, U2) to test the imbalance influence on the fluting effect due to discharge and rotor-to-ground bearing currents. The damaging effect of inverter-induced bearing currents is influenced by the parameters 'rotor speed', 'bearing temperature', 'bearing grease' and 'grounding conditions' of the inverter-motor-system. The impact of a static rotor imbalance on the damaging process caused by the parasitic bearing currents is so far unknown. Therefore it shall be clarified, if the combination of static rotor imbalance and bearing currents may damage the bearing raceway surfaces much faster than without imbalance. As a concluding result our test procedures showed no acceleration of bearing deterioration due to static rotor imbalances.