EPE Association: EPE 1993 - 15 - Lecture Session L5c: DRIVES: PWM AND RESONANT, APPLICATIONS

EPE 1993 - 15 - Lecture Session L5c: DRIVES: PWM AND RESONANT, APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 15 - Lecture Session L5c: DRIVES: PWM AND RESONANT, APPLICATIONS

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   HIGH-SPEED, LARGE-POWER INDUCTION MOTORS FOR DIRECT COUPLING TO VARIABLE-SPEED GAS COMPRESSORS
By M. Bressani;, A. Odorico; M. Sica [View]
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Abstract: In the recent years Ansaldo Industria SpA and Ross Hill Controls corp. developed a series of large-power, variable-speed drives with induction motor, suitable for direct driving of high-speed fluidodynamic machines. The most significant field of application is the pipeline industry, where the variable-speed drives are generally used for peak service of gas compression stations located close to highly populated areas. The paper covers the authors' experience in designing, manufacturing and testing large-power, high-speed induction motors. Reference is made to the drive systems already tested and commissioned: two rated 5250 kW, 3200 to 5500 rpm and two rated 6600 kW, 2400 to 5200 rpm, all installed in USA. Special emphasis is given to the main aspects which characterize this hightech product: electromagnetic design, mechanical design, rotordynamics and balancing, vibrations, back-to-back testing. The motor test results in terms of vibrations, efficiency, noise level, power factor and overall performance and the field experience have been very encouraging so far and confirm the validity and reliability of the high-speed induction motor solution, which can be extended to significantly larger ratings and speeds.

   A Quasi-Resonant Converter-fed DC Drive System
By C. C. Chong; C. Y. Chan; C. F. Foo [View]
[Download]

Abstract: This paper describes the design and application of a zero-voltage switching quasi-resonant converter for a DC servo drive system. Comparisons are made between the zero-voltage switching quasi-resonant converter fed DC drive and a pulse-width modulated converter fed DC drive in terms of the frequency spectrum of their AC ripples in the output current and input line current. Experimental results show that the application of the zero voltage switching quasi-resonant converter to DC drives result in lower switching losses and reduced harmonic contents.

   THE STRUCTURE OF OPTIMIZED PULSE PATTERNS
By G. Heinle [View]
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Abstract: The harmonic losses and peak currents in motors supplied by PWM inverters can be significantly reduced by means of optimized pulse patterns. In the past, the design engineer has been presented with a bewildering variety of pulse patterns and optimization methods for finding the desired optimum. With all these processes, there is always the uncertainty with respect to high pulse numbers as to whether the absolute optimum or merely a local optimum has been found. The purpose of this paper is to structure and classify the numerous optimized pulse patterns, and to illustrate their appearance and characteristics. The classificatlon of pulse patterns results in a number of criteria which can serve with a high degree of reliability for deciding whether the optimum has been found. The paper also presents a vector-oriented optlmization method which allows optimization up to very high pulse numbers and requires only little computation time. In this case, minimizing the harmonic losses in the motor was chosen as the criterion for optimization.

   THE HIGH SPEED OIL FREE INTELLIGENT MOTOR-COMPRESSOR
By A. David Graham; Martyn Wimshurst [View]
[Download]

Abstract: The paper describes the development and performance of a 333 Hz, 2350 V inverter controlling a two pole cage induction machine. This high speed machine (20 000 rpm) is directly coupled to a centrifugal compressor and the shaft system is supported on four axial electromagnetic hearings. A consortium of five European companies combined to develop the complete integrated compressor drive and funding was provided in part by a Brite Euram research grant from the European Community.

EPE 1993 - 15 - Lecture Session L5c: DRIVES: PWM AND RESONANT, APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1993 - Conference > EPE 1993 - 15 - Lecture Session L5c: DRIVES: PWM AND RESONANT, APPLICATIONS
	[return to parent folder]

	HIGH-SPEED, LARGE-POWER INDUCTION MOTORS FOR DIRECT COUPLING TO VARIABLE-SPEED GAS COMPRESSORS By M. Bressani;, A. Odorico; M. Sica	[View] [Download]
Abstract: In the recent years Ansaldo Industria SpA and Ross Hill Controls corp. developed a series of large-power, variable-speed drives with induction motor, suitable for direct driving of high-speed fluidodynamic machines. The most significant field of application is the pipeline industry, where the variable-speed drives are generally used for peak service of gas compression stations located close to highly populated areas. The paper covers the authors' experience in designing, manufacturing and testing large-power, high-speed induction motors. Reference is made to the drive systems already tested and commissioned: two rated 5250 kW, 3200 to 5500 rpm and two rated 6600 kW, 2400 to 5200 rpm, all installed in USA. Special emphasis is given to the main aspects which characterize this hightech product: electromagnetic design, mechanical design, rotordynamics and balancing, vibrations, back-to-back testing. The motor test results in terms of vibrations, efficiency, noise level, power factor and overall performance and the field experience have been very encouraging so far and confirm the validity and reliability of the high-speed induction motor solution, which can be extended to significantly larger ratings and speeds.

	A Quasi-Resonant Converter-fed DC Drive System By C. C. Chong; C. Y. Chan; C. F. Foo	[View] [Download]
Abstract: This paper describes the design and application of a zero-voltage switching quasi-resonant converter for a DC servo drive system. Comparisons are made between the zero-voltage switching quasi-resonant converter fed DC drive and a pulse-width modulated converter fed DC drive in terms of the frequency spectrum of their AC ripples in the output current and input line current. Experimental results show that the application of the zero voltage switching quasi-resonant converter to DC drives result in lower switching losses and reduced harmonic contents.

	THE STRUCTURE OF OPTIMIZED PULSE PATTERNS By G. Heinle	[View] [Download]
Abstract: The harmonic losses and peak currents in motors supplied by PWM inverters can be significantly reduced by means of optimized pulse patterns. In the past, the design engineer has been presented with a bewildering variety of pulse patterns and optimization methods for finding the desired optimum. With all these processes, there is always the uncertainty with respect to high pulse numbers as to whether the absolute optimum or merely a local optimum has been found. The purpose of this paper is to structure and classify the numerous optimized pulse patterns, and to illustrate their appearance and characteristics. The classificatlon of pulse patterns results in a number of criteria which can serve with a high degree of reliability for deciding whether the optimum has been found. The paper also presents a vector-oriented optlmization method which allows optimization up to very high pulse numbers and requires only little computation time. In this case, minimizing the harmonic losses in the motor was chosen as the criterion for optimization.

	THE HIGH SPEED OIL FREE INTELLIGENT MOTOR-COMPRESSOR By A. David Graham; Martyn Wimshurst	[View] [Download]
Abstract: The paper describes the development and performance of a 333 Hz, 2350 V inverter controlling a two pole cage induction machine. This high speed machine (20 000 rpm) is directly coupled to a centrifugal compressor and the shaft system is supported on four axial electromagnetic hearings. A consortium of five European companies combined to develop the complete integrated compressor drive and funding was provided in part by a Brite Euram research grant from the European Community.