EPE Association: EPE 2016 - LS4c: Motor/Inverter

EPE 2016 - LS4c: Motor/Inverter
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 04: Electrical Machines and Drive Systems > EPE 2016 - LS4c: Motor/Inverter

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   Converter-fed Induction Motor Losses in Different Operating Points
By Hannu KÄRKKÄINEN [View]
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Abstract: The use of converters to feed the motors instead of the direct-on-line supply has increased the need to understand the losses of the induction machine in different operating points. Most of the earlier studies have focused on the losses with the nominal supply frequency while this study covers most of the frequency-torque plane below nominal values. A 15 kW standard squirrel-cage machine's losses are analyzed in 16 different operating points with torque values of 25 \%, 50 \%, 75 \% and 100 \% of motor rated torque and supply frequency values of 25 \%, 50 \%, 75 \% and 100 \% of rated motor frequency. Measurements in all 16 operating points are made with both sinusoidal generator supply and with frequency converter supply.

   Novel Integrated Motor Design that Supports Phase and Pole Changes using Multiphase or Single-Phase Inverters
By Kazuto SAKAI [View]
[Download]

Abstract: To reduce energy consumption, a novel motor system was proposed using two individual current control technologies involving (1) a multiphase inverter and (2) a single-phase inverter. The multiphase inverter technology comprised two sets of three-phase windings connecting two three-phase inverters. Each set of coils connecting the three-phase inverters formed a rotating field. The two windings allowed the resultant field to generate a rotating field of eight or four poles. In contrast, the single-phase inverter technology connected each coil to a single-phase inverter circuit to control individual current vectors. Motor systems capable of changing their pole and phase operate at higher efficiencies over a wide range of speeds. The single-phase inverter technology additionally reduced torque ripple and vibration by controlling the current of each coil independently. For the multiphase inverter technology, results from both simulation and experimental tests confirmed that the motor is capable of changing the pole and phase during rotation. Experimental test results also confirmed that the single-phase inverter technology reduced iron loss in a motor by 50\% during pole change.

   Permanent magnet synchronous machines armature reaction form factors
By Karel HRUSKA [View]
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Abstract: The paper introduces a numerical method of simplified calculation of armature reaction form factors of synchronous machines with focus on permanent magnet synchronous machines. Furthermore it discusses suitable approach for calculation of these coefficients and foreseeable results. On six available examples of permanent magnet synchronous motor topologies it presents achieved results.

   Power loss evaluation for medium voltage drive system based on back-to-back three-level NPC converter integrated with induction machine
By Marcin ZYGMANOWSKI [View]
[Download]

Abstract: The paper deals with loss issues in an experimental 3.3 kV drive system consisting of back-to-back three-level NPC converter integrated with an induction machine. This integration significantly reduces the size and weight of the whole drive and allows verifying the effect of switching frequency on drive system losses distribution.

EPE 2016 - LS4c: Motor/Inverter
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2016 ECCE Europe - Conference > EPE 2016 - Topic 04: Electrical Machines and Drive Systems > EPE 2016 - LS4c: Motor/Inverter
	[return to parent folder]

	Converter-fed Induction Motor Losses in Different Operating Points By Hannu KÄRKKÄINEN	[View] [Download]
Abstract: The use of converters to feed the motors instead of the direct-on-line supply has increased the need to understand the losses of the induction machine in different operating points. Most of the earlier studies have focused on the losses with the nominal supply frequency while this study covers most of the frequency-torque plane below nominal values. A 15 kW standard squirrel-cage machine's losses are analyzed in 16 different operating points with torque values of 25 \%, 50 \%, 75 \% and 100 \% of motor rated torque and supply frequency values of 25 \%, 50 \%, 75 \% and 100 \% of rated motor frequency. Measurements in all 16 operating points are made with both sinusoidal generator supply and with frequency converter supply.

	Novel Integrated Motor Design that Supports Phase and Pole Changes using Multiphase or Single-Phase Inverters By Kazuto SAKAI	[View] [Download]
Abstract: To reduce energy consumption, a novel motor system was proposed using two individual current control technologies involving (1) a multiphase inverter and (2) a single-phase inverter. The multiphase inverter technology comprised two sets of three-phase windings connecting two three-phase inverters. Each set of coils connecting the three-phase inverters formed a rotating field. The two windings allowed the resultant field to generate a rotating field of eight or four poles. In contrast, the single-phase inverter technology connected each coil to a single-phase inverter circuit to control individual current vectors. Motor systems capable of changing their pole and phase operate at higher efficiencies over a wide range of speeds. The single-phase inverter technology additionally reduced torque ripple and vibration by controlling the current of each coil independently. For the multiphase inverter technology, results from both simulation and experimental tests confirmed that the motor is capable of changing the pole and phase during rotation. Experimental test results also confirmed that the single-phase inverter technology reduced iron loss in a motor by 50\% during pole change.

	Permanent magnet synchronous machines armature reaction form factors By Karel HRUSKA	[View] [Download]
Abstract: The paper introduces a numerical method of simplified calculation of armature reaction form factors of synchronous machines with focus on permanent magnet synchronous machines. Furthermore it discusses suitable approach for calculation of these coefficients and foreseeable results. On six available examples of permanent magnet synchronous motor topologies it presents achieved results.

	Power loss evaluation for medium voltage drive system based on back-to-back three-level NPC converter integrated with induction machine By Marcin ZYGMANOWSKI	[View] [Download]
Abstract: The paper deals with loss issues in an experimental 3.3 kV drive system consisting of back-to-back three-level NPC converter integrated with an induction machine. This integration significantly reduces the size and weight of the whole drive and allows verifying the effect of switching frequency on drive system losses distribution.