EPE Association: EPE 2016 - LS5c: Special Motors

EPE 2016 - LS5c: Special Motors
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 - LS5c: Special Motors

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   Active Radial Magnetic Bearing for an Ultra-High Speed Motor
By Marcel SCHUCK [View]
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Abstract: The miniaturization trend of electric machines increases the demand for higher rotational speeds to provide a desired mechanical power level at decreased size. To push the limits of rotor miniaturization, new concepts for an ultra-high speed motor are researched, which employs sub-millimeter size rotors and is capable of achieving rotational speeds above 25 million rotations per minute (Mrpm). The rotor is supported by means of a frictionless active magnetic bearing, which counteracts the gravitational force in vertical direction. Due to the low damping of the rotor, a magnetic bearing is also required in horizontal direction for to fully stabilize it. The respective system model, position sensor system and controller design for such a magnetic bearing are outlined in this study. Experimental results demonstrate an increased horizontal damping of the rotor by a factor of more than 100.

   Design and Analysis of a High-Speed Induction Machine as Electric Vehicle Traction Drive
By Torsten EPSKAMP [View]
[Download]

Abstract: This paper presents the design and analysis of a high-speed induction machine with a die cast copper squirrel cage used as traction drive in an electrical vehicle. Herby the drive performance of the machine in combination with a three gear shift gearbox is described. Great attention is paid to the mechanical design and the necessary simulations to ensure save operation of the machine at maximum speed of 30,000 rpm. With help of a Finite Element Analysis an overspeed test and operation at different thermal conditions are investigated. The maximum allowable operation speed of the die cast copper rotor is determined and an end cap is presented, that enables to reach the required 30,000 rpm operation speed. Additionally, the presented end cap allows to balance the rotor without influence on the active parts. Other critical aspects, as balancing and the behaviour of the shaft-hub joint at high-speed operation, are also investigated.

   Design of the Power Series based on Traction Induction Motor
By Jan LAKSAR [View]
[Download]

Abstract: The power series described in this paper are designed while preserving the cross-section of themachine. All basic approaches to create the series are discussed and the suitable elements of the seriesare chosen. Finally, the properties of the selected motors are compared, especially the parameters ofthe equivalent circuit.

   Influence of Parasitic Capacitances of IGBT Inverter on Insulation Condition Monitoring of Traction Machines Based on Current Signal Transients Analysis
By Clemens ZOELLER [View]
[Download]

Abstract: At inverter-fed traction drives stray currents due to parasitic capacitances in frequency converters andmachine cause high frequency voltage components spreading into all conductive components of thedrive system. These hf voltages are harmful and origin from the inverter side through fast switchingpower semiconductors with high levels of output voltage steepness. Additionally overvoltage at themachine occurs by inverter operation of the machine and is thus stressing the machine insulationsystem. These effects can lead to a reduction of the machine insulation lifetime due to loss ofinsulation strength. Thus, insulation condition monitoring systems are necessary to enable a safe andreliable operation of a drive. Insulation condition monitoring of inverter-fed traction drives isimplemented in this work by evaluating the transient current response after voltage step excitation.The current measurement is performed using the built-in current transducers of the inverter, normallyused for the control of the drive, to save cost and space. Insulation degradation usually is a slowlydeveloping process, at which the parasitic capacitances of the winding system change and thus also thetransient current response. However, influences from the inverter capacitances cannot be neglectedand thus the influence of the parasitic capacitances located in the inverter on the proposed insulationcondition monitoring is investigated.

EPE 2016 - LS5c: Special Motors
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 - LS5c: Special Motors
	[return to parent folder]

	Active Radial Magnetic Bearing for an Ultra-High Speed Motor By Marcel SCHUCK	[View] [Download]
Abstract: The miniaturization trend of electric machines increases the demand for higher rotational speeds to provide a desired mechanical power level at decreased size. To push the limits of rotor miniaturization, new concepts for an ultra-high speed motor are researched, which employs sub-millimeter size rotors and is capable of achieving rotational speeds above 25 million rotations per minute (Mrpm). The rotor is supported by means of a frictionless active magnetic bearing, which counteracts the gravitational force in vertical direction. Due to the low damping of the rotor, a magnetic bearing is also required in horizontal direction for to fully stabilize it. The respective system model, position sensor system and controller design for such a magnetic bearing are outlined in this study. Experimental results demonstrate an increased horizontal damping of the rotor by a factor of more than 100.

	Design and Analysis of a High-Speed Induction Machine as Electric Vehicle Traction Drive By Torsten EPSKAMP	[View] [Download]
Abstract: This paper presents the design and analysis of a high-speed induction machine with a die cast copper squirrel cage used as traction drive in an electrical vehicle. Herby the drive performance of the machine in combination with a three gear shift gearbox is described. Great attention is paid to the mechanical design and the necessary simulations to ensure save operation of the machine at maximum speed of 30,000 rpm. With help of a Finite Element Analysis an overspeed test and operation at different thermal conditions are investigated. The maximum allowable operation speed of the die cast copper rotor is determined and an end cap is presented, that enables to reach the required 30,000 rpm operation speed. Additionally, the presented end cap allows to balance the rotor without influence on the active parts. Other critical aspects, as balancing and the behaviour of the shaft-hub joint at high-speed operation, are also investigated.

	Design of the Power Series based on Traction Induction Motor By Jan LAKSAR	[View] [Download]
Abstract: The power series described in this paper are designed while preserving the cross-section of themachine. All basic approaches to create the series are discussed and the suitable elements of the seriesare chosen. Finally, the properties of the selected motors are compared, especially the parameters ofthe equivalent circuit.

	Influence of Parasitic Capacitances of IGBT Inverter on Insulation Condition Monitoring of Traction Machines Based on Current Signal Transients Analysis By Clemens ZOELLER	[View] [Download]
Abstract: At inverter-fed traction drives stray currents due to parasitic capacitances in frequency converters andmachine cause high frequency voltage components spreading into all conductive components of thedrive system. These hf voltages are harmful and origin from the inverter side through fast switchingpower semiconductors with high levels of output voltage steepness. Additionally overvoltage at themachine occurs by inverter operation of the machine and is thus stressing the machine insulationsystem. These effects can lead to a reduction of the machine insulation lifetime due to loss ofinsulation strength. Thus, insulation condition monitoring systems are necessary to enable a safe andreliable operation of a drive. Insulation condition monitoring of inverter-fed traction drives isimplemented in this work by evaluating the transient current response after voltage step excitation.The current measurement is performed using the built-in current transducers of the inverter, normallyused for the control of the drive, to save cost and space. Insulation degradation usually is a slowlydeveloping process, at which the parasitic capacitances of the winding system change and thus also thetransient current response. However, influences from the inverter capacitances cannot be neglectedand thus the influence of the parasitic capacitances located in the inverter on the proposed insulationcondition monitoring is investigated.