EPE Association: EPE 1995 - 17 - Lecture Session L5a: DRIVE CONTROL

EPE 1995 - 17 - Lecture Session L5a: DRIVE CONTROL
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   PULSE WIDTH MODULATION-VECTOR CON'l'ROL INVERTER-FED LOW VOLTAGE INDUCTION MOTORS: EXPERIENCE ON A HIGH SPEED ROLLING MILL STAND OF 480 KW/1500-3000 rpm
By F. Feudale; A. Odorico; M. Sica; G. Stanic; G. Torri [View]
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Abstract: The paper deals with authors' experience in designing and testing of a motor-inverter system for a new generation of high speed metal rolling mill stand. The engineering aspects related to the complex application requirements, the IGBT technology for the power converter, the electromagnetic design, bearing selection, cooling, ventilation system and insulation technique for the induction motor are covered. An extensive system testing is described, giving emphasis on the comparison between PWM and pure sine-wave power supplied motor behaviour. Other similar applications are also described.

   VECON: HIGH-PERFORMANCE DIGITAL CONTROL OF AC DRIVES BY ONE-CHIP SERVO CONTROLLER
By Edwin Kiel; Walter Schumacher [View]
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Abstract: A high performance low cost chip set was developed for the control of AC servo drives. It consists of a digital chip with a dual processor and an analog subsystem for A/D conversion. The digital chip includes a custom signal processor for the high speed control loops, custom peripheral functions for PWM generation and sensor evaluation and an extra high speed microcontroller, which is free for process control tasks, communication, diagnoses and user interface. Both processors are freely programmable, allowing use of the chip set in various applications from high performance servo drives for synchronous and asynchronous motors over sensorless control schemes for AC motors to PWM controlled rectifiers to achieve sinusoïdal line currents. This paper shows the different applications and gives details about the calculation times for various software building blocks for digital control. The chip set was developed for a group of 40 European drive manufactures within a joint development project.

   A NEURAL ROTOR FLUX OBSERVER FOR INDUCTION MOTOR CONTROL
By A. Alessandri; S. Dagnino; M. Marchesoni; M. Mazzucchelli; P. Saccani [View]
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Abstract: Rotor flux observers can provide an useful mean for achieving field oriented control of induction machine. Estimating the state of a nonlinear system, through a noisy measurement channel, is still a challenge and the aim of this paper is to describe how multilayer feedforward neural networks can be trained successfully in the case of rotor flux estimation. The method presented exploits off-line training on a large set of learning patterns. Both steady-state and transients conditions over full operative speed range have been considered. The basic idea of this approach is to constrain the optimal state estimator to take the structure of a feedforward neural network. This strategy involve a potential leak of accuracy, nevertheless approximating features of neural nets allow to achieve excellent results. The rotor flux observer bas been trained and tested by means of numerical simulations. Computer results establish the effectiveness and the robustness of the suggested method.

   THE IMPLEMENTATION OF A VECTOR CONTROL SCHEME BASED ON AN ADVANCED MOTOR MODEL
By R.C. Healey [View]
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Abstract: An advanced motor model for vector controlled induction motors is proposed in which saturation and skin effect are included. The practical implementation of the model in a 7 .5 kW, DSP-based drive is described. The model is verified by comparing the measured transient torque produced by the motor when operating with controllers based on a traditional model and the advanced model.

EPE 1995 - 17 - Lecture Session L5a: DRIVE CONTROL
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 17 - Lecture Session L5a: DRIVE CONTROL
	[return to parent folder]

	PULSE WIDTH MODULATION-VECTOR CON'l'ROL INVERTER-FED LOW VOLTAGE INDUCTION MOTORS: EXPERIENCE ON A HIGH SPEED ROLLING MILL STAND OF 480 KW/1500-3000 rpm By F. Feudale; A. Odorico; M. Sica; G. Stanic; G. Torri	[View] [Download]
Abstract: The paper deals with authors' experience in designing and testing of a motor-inverter system for a new generation of high speed metal rolling mill stand. The engineering aspects related to the complex application requirements, the IGBT technology for the power converter, the electromagnetic design, bearing selection, cooling, ventilation system and insulation technique for the induction motor are covered. An extensive system testing is described, giving emphasis on the comparison between PWM and pure sine-wave power supplied motor behaviour. Other similar applications are also described.

	VECON: HIGH-PERFORMANCE DIGITAL CONTROL OF AC DRIVES BY ONE-CHIP SERVO CONTROLLER By Edwin Kiel; Walter Schumacher	[View] [Download]
Abstract: A high performance low cost chip set was developed for the control of AC servo drives. It consists of a digital chip with a dual processor and an analog subsystem for A/D conversion. The digital chip includes a custom signal processor for the high speed control loops, custom peripheral functions for PWM generation and sensor evaluation and an extra high speed microcontroller, which is free for process control tasks, communication, diagnoses and user interface. Both processors are freely programmable, allowing use of the chip set in various applications from high performance servo drives for synchronous and asynchronous motors over sensorless control schemes for AC motors to PWM controlled rectifiers to achieve sinusoïdal line currents. This paper shows the different applications and gives details about the calculation times for various software building blocks for digital control. The chip set was developed for a group of 40 European drive manufactures within a joint development project.

	A NEURAL ROTOR FLUX OBSERVER FOR INDUCTION MOTOR CONTROL By A. Alessandri; S. Dagnino; M. Marchesoni; M. Mazzucchelli; P. Saccani	[View] [Download]
Abstract: Rotor flux observers can provide an useful mean for achieving field oriented control of induction machine. Estimating the state of a nonlinear system, through a noisy measurement channel, is still a challenge and the aim of this paper is to describe how multilayer feedforward neural networks can be trained successfully in the case of rotor flux estimation. The method presented exploits off-line training on a large set of learning patterns. Both steady-state and transients conditions over full operative speed range have been considered. The basic idea of this approach is to constrain the optimal state estimator to take the structure of a feedforward neural network. This strategy involve a potential leak of accuracy, nevertheless approximating features of neural nets allow to achieve excellent results. The rotor flux observer bas been trained and tested by means of numerical simulations. Computer results establish the effectiveness and the robustness of the suggested method.

	THE IMPLEMENTATION OF A VECTOR CONTROL SCHEME BASED ON AN ADVANCED MOTOR MODEL By R.C. Healey	[View] [Download]
Abstract: An advanced motor model for vector controlled induction motors is proposed in which saturation and skin effect are included. The practical implementation of the model in a 7 .5 kW, DSP-based drive is described. The model is verified by comparing the measured transient torque produced by the motor when operating with controllers based on a traditional model and the advanced model.