EPE Association: EPE 1987 - 19 - Lecture Session 3.1: DRIVES (I)

EPE 1987 - 19 - Lecture Session 3.1: DRIVES (I)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 19 - Lecture Session 3.1: DRIVES (I)

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   SOLID STATE SWITCH FOR STARTING SINGLE PHASE INDUCTION MOTORS
By Jan K. Sedivy [View]
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Abstract: Mechanical switches using centrifugal force have been used for many years to actuate the switch in the auxiliary (start) phase of single phase induction motors. When the motor reaches a certain speed (cutout speed), the switch opens and disconnects the auxiliary winding or the start capacitor from the rest of the circuit. Should the speed decrease due to an overload and reach a certain cut-in speed, the switch is closed again. Even though the switch is very simple in principle, it has many disadvantages. This paper describes the development of a solid state switch which should have equal or better performance characteristics than the mechanical switch. Inherent properties of the motors which can be used for speed indication are reviewed and experimental results are presented.

   A NEW METHOD FOR THE ANALYSIS OF THE CURRENT SOURCE INVERTER FED INDUCTION MOTOR
By P. Anciaux; H. Buyse; F. Labrique [View]
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Abstract: In the last years, the converter-fed induction motor is more and more applied for variable speed drives. The association induction motor / current source inverter is especially adapted to medium power applications. The communication proposes a new method for the analysis of the current source inverter fed induction motor based on the choice of the DC current and the main fluxes of the induction machine as state variables. Considering these variables as constant during a commutation interval in steady-state, it is possible to determine analytical expressions for the voltage at the DC side of the inverter and for the motor EM torque and rotor currents. These expressions are useful for the evaluation of the characteristics of the current-inverter fed induction motor.

   COMPUTATION OF THE EFFECTS ON THE POWER SUPPLY, OF ADJUSTABLE CYCLOCONVERTER-FED A.C. DRIVES
By R. Le Doeuff; M. Sidibe; J. Gautrelet [View]
[Download]

Abstract: The following paper deals with a digital study of the harmonic currents absorbed by a cycloconverter drive. A complete simulation programme of the cycloconverter is used in order to obtain the mains currents and a F.F.T. algorithm gives the harmonic components of these currents. The computed results are compared with experimental ones and the influence of various parameters is studied.

   ENERGY SUPPLY AND STABILIZATION OF VEHICLE NETWORK BY DECENTRALIZED BOOST CONVERTERS
By W. Grueb; K. Wegerer [View]
[Download]

Abstract: The functionally redundant energy supply of the Maglev vehicle Transrapid 06 II, described below, comprises four independent networks provided with buffer batteries and 30 linear generators per vehicle section. The adaptation of the linear generator voltage dependent on the speed and load to the 440 V direct voltage networks and their dynamic stabilization and the loading of the buffer batteries is ensured by boost converters. With a highly reliable energy supply of the vehicle, an optimal use of the energy always available during operation and adapted to the particular requirements can be obtained from the linear generators.

   A LOW WEIGHT SUPPLY CIRCUIT FOR ASYNCHRONOUS TRACTION FED FROM A 16 2/3 HZ LINE
By S. Östlund; F. Gustavson; P. Leander [View]
[Download]

Abstract: In many traction applications a reduction of vehicle weight is desirable. In vehicles fed from a 16 2/3 Hz line the transformer weight is considerable. By chopping the line voltage, the transformer can be fed with a higher frequency and a substantial reduction of its weight and losses is possible. A supply circuit which changes the line voltage to a higher frequency has been analysed both theoretically and by computer simulations. The system allows operation with a power factor very close to unity and the direction of power flow is arbitrary, that is regenerative braking is also possible. By chopping the line voltage with a frequency of 150 Hz it is possible to reduce the transformer weight and losses to about 1/4 of the corresponding values for a normal 16 2/3 Hz transformer.

EPE 1987 - 19 - Lecture Session 3.1: DRIVES (I)
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 19 - Lecture Session 3.1: DRIVES (I)
	[return to parent folder]

	SOLID STATE SWITCH FOR STARTING SINGLE PHASE INDUCTION MOTORS By Jan K. Sedivy	[View] [Download]
Abstract: Mechanical switches using centrifugal force have been used for many years to actuate the switch in the auxiliary (start) phase of single phase induction motors. When the motor reaches a certain speed (cutout speed), the switch opens and disconnects the auxiliary winding or the start capacitor from the rest of the circuit. Should the speed decrease due to an overload and reach a certain cut-in speed, the switch is closed again. Even though the switch is very simple in principle, it has many disadvantages. This paper describes the development of a solid state switch which should have equal or better performance characteristics than the mechanical switch. Inherent properties of the motors which can be used for speed indication are reviewed and experimental results are presented.

	A NEW METHOD FOR THE ANALYSIS OF THE CURRENT SOURCE INVERTER FED INDUCTION MOTOR By P. Anciaux; H. Buyse; F. Labrique	[View] [Download]
Abstract: In the last years, the converter-fed induction motor is more and more applied for variable speed drives. The association induction motor / current source inverter is especially adapted to medium power applications. The communication proposes a new method for the analysis of the current source inverter fed induction motor based on the choice of the DC current and the main fluxes of the induction machine as state variables. Considering these variables as constant during a commutation interval in steady-state, it is possible to determine analytical expressions for the voltage at the DC side of the inverter and for the motor EM torque and rotor currents. These expressions are useful for the evaluation of the characteristics of the current-inverter fed induction motor.

	COMPUTATION OF THE EFFECTS ON THE POWER SUPPLY, OF ADJUSTABLE CYCLOCONVERTER-FED A.C. DRIVES By R. Le Doeuff; M. Sidibe; J. Gautrelet	[View] [Download]
Abstract: The following paper deals with a digital study of the harmonic currents absorbed by a cycloconverter drive. A complete simulation programme of the cycloconverter is used in order to obtain the mains currents and a F.F.T. algorithm gives the harmonic components of these currents. The computed results are compared with experimental ones and the influence of various parameters is studied.

	ENERGY SUPPLY AND STABILIZATION OF VEHICLE NETWORK BY DECENTRALIZED BOOST CONVERTERS By W. Grueb; K. Wegerer	[View] [Download]
Abstract: The functionally redundant energy supply of the Maglev vehicle Transrapid 06 II, described below, comprises four independent networks provided with buffer batteries and 30 linear generators per vehicle section. The adaptation of the linear generator voltage dependent on the speed and load to the 440 V direct voltage networks and their dynamic stabilization and the loading of the buffer batteries is ensured by boost converters. With a highly reliable energy supply of the vehicle, an optimal use of the energy always available during operation and adapted to the particular requirements can be obtained from the linear generators.

	A LOW WEIGHT SUPPLY CIRCUIT FOR ASYNCHRONOUS TRACTION FED FROM A 16 2/3 HZ LINE By S. Östlund; F. Gustavson; P. Leander	[View] [Download]
Abstract: In many traction applications a reduction of vehicle weight is desirable. In vehicles fed from a 16 2/3 Hz line the transformer weight is considerable. By chopping the line voltage, the transformer can be fed with a higher frequency and a substantial reduction of its weight and losses is possible. A supply circuit which changes the line voltage to a higher frequency has been analysed both theoretically and by computer simulations. The system allows operation with a power factor very close to unity and the direction of power flow is arbitrary, that is regenerative braking is also possible. By chopping the line voltage with a frequency of 150 Hz it is possible to reduce the transformer weight and losses to about 1/4 of the corresponding values for a normal 16 2/3 Hz transformer.