EPE Association: NORpie 1998 - Topic 06: ELECTRIC MACHINES

NORpie 1998 - Topic 06: ELECTRIC MACHINES
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 1998 > NORpie 1998 - Topic 06: ELECTRIC MACHINES

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   Permanent-Magnet Motor for a Hybrid Electric Vehicle
By J. Lindstrom; J. Luorni; J. Hellsing [View]
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Abstract: The paper deals with a 100 kW permanent-magnet synchronous motor of the inset-magnet type for a hybrid electric vehicle. The motor characteristics are evaluated by finite element analysis and driving simulations. The optimization of the motor is based on an objective function including the energy losses, weights and production costs of the electric drivetrain, as well as the amount of batteries required in a pure-electric operation. The experimental motor has a high efficiency in a wide operating region. A calorimetric method is used for measuring the losses af the machine.

   Voltage Stresses on Frequency Converter Driven Motors in Cranes
By Janne Martin [View]
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Abstract: This paper presents the voltage stresses on a squirrel-cage motor when the motor is supplied by a frequency converter with modern insulated gate bipolar transistors (IGBT) and where there is a long cable between the motor and the frequency converter. Voltage stresses occur with frequency converter drives when the output voltage of the frequency converter consists of pulses. These pulses cause voltage stresses on the motor when they are reflected from an impedance boundary. Voltage stresses are a well-known problem with frequency converter drives, but numerous articles in the literature about them address cases in which the peak voltage in the motor terminal is twice the DC bus voltage, or less. In practice, the peak voltage in the motor terminal may be even more than that: for example, three times the DC bus voltage. These voltage peaks are very harmful to the insulation of the motor, especially in older motors that are not designed for frequency converter drives. This paper reports on the measurements, research and results of this phenomenon in crane applications.

   Effects of Rotor Eccentricity on Induction Machine Transient State: A Numerical Analysis Using Finite Elements
By F. David; A. Niemenmaa [View]
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Abstract: The behaviour of an induction machine with static and dynamic eccentric rotor during the starting process is analysed by finite element method. A 13 kW, 1500 rpm squirrel cage induction motor is used as example for numerical investigations. The results include currents of stator winding, electromagnetic torque and unbalanced magnetic pull. The frequency spectrum of stator currents, and time and space harmonics of radial forces and airgap field are also presented in no-load steady-state.

NORpie 1998 - Topic 06: ELECTRIC MACHINES
You are here: EPE Documents > 05 - EPE Supported Conference Proceedings > NORpie - Proceedings > NORpie 1998 > NORpie 1998 - Topic 06: ELECTRIC MACHINES
	[return to parent folder]

	Permanent-Magnet Motor for a Hybrid Electric Vehicle By J. Lindstrom; J. Luorni; J. Hellsing	[View] [Download]
Abstract: The paper deals with a 100 kW permanent-magnet synchronous motor of the inset-magnet type for a hybrid electric vehicle. The motor characteristics are evaluated by finite element analysis and driving simulations. The optimization of the motor is based on an objective function including the energy losses, weights and production costs of the electric drivetrain, as well as the amount of batteries required in a pure-electric operation. The experimental motor has a high efficiency in a wide operating region. A calorimetric method is used for measuring the losses af the machine.

	Voltage Stresses on Frequency Converter Driven Motors in Cranes By Janne Martin	[View] [Download]
Abstract: This paper presents the voltage stresses on a squirrel-cage motor when the motor is supplied by a frequency converter with modern insulated gate bipolar transistors (IGBT) and where there is a long cable between the motor and the frequency converter. Voltage stresses occur with frequency converter drives when the output voltage of the frequency converter consists of pulses. These pulses cause voltage stresses on the motor when they are reflected from an impedance boundary. Voltage stresses are a well-known problem with frequency converter drives, but numerous articles in the literature about them address cases in which the peak voltage in the motor terminal is twice the DC bus voltage, or less. In practice, the peak voltage in the motor terminal may be even more than that: for example, three times the DC bus voltage. These voltage peaks are very harmful to the insulation of the motor, especially in older motors that are not designed for frequency converter drives. This paper reports on the measurements, research and results of this phenomenon in crane applications.

	Effects of Rotor Eccentricity on Induction Machine Transient State: A Numerical Analysis Using Finite Elements By F. David; A. Niemenmaa	[View] [Download]
Abstract: The behaviour of an induction machine with static and dynamic eccentric rotor during the starting process is analysed by finite element method. A 13 kW, 1500 rpm squirrel cage induction motor is used as example for numerical investigations. The results include currents of stator winding, electromagnetic torque and unbalanced magnetic pull. The frequency spectrum of stator currents, and time and space harmonics of radial forces and airgap field are also presented in no-load steady-state.