EPE Association: EPE 1987 - 21 - Lecture Session 3.3: SPECIAL PROBLEMS

EPE 1987 - 21 - Lecture Session 3.3: SPECIAL PROBLEMS
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   TRANSIENT RESPONSE OF A RECTIFIED SYNCHRONOUS MACHINE CONNECTED TO AN INDUCTIVE LOAD
By J.-F. Ballay; M. Ivanes; R. Feuillet [View]
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Abstract: This paper reports on the transient behaviour of a rectified synchronous machine, connected to an inductive load. This operation is pointed out to be equivalent with the operation of the machine connected to a variable 3-phase impedance. We call this latter "Transient Equivalent Impedance". The resolution, dealing with the operational calculus through the Park model, leads to transfer functions for analyzing the transient response to an excitation field voltage perturbation. This approach will permit more complicated systems and their regulations to be analysed in further papers.

   AN INTEGRATED APPROACH TO SWITCHED RELUCTANCE MOTOR DESIGN
By C. Pollock; B. W. Williams [View]
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Abstract: This paper highlights the need for good low speed performance from the switched reluctance motor. It investigates several motor configurations and the performance of various power converter circuits. It is shown that an increase in the number of stator poles in a motor allows smoother running at low speeds. The advantages of using the asymmetric bridge as the power switching circuit are discussed. An integrated design approach leads to the development of a "compact converter" which is based on the asymmetric bridge. Performance is predicted using a computer design package and the advantages and disadvantages of various motor and controller combinations are ascertained.

   A SMALL POWER DIGITAL SYNCHRONOUS TORQUER
By G. Champenois; Ph. Mollard; J. P. Rognon [View]
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Abstract: In several applications using small power actuators, a good dynamic and steady state position accuracy is needed, at low speeds and with limited accelerations (scientific instruments, special machine-tools and robots). For these applications stepper motors are commonly used. The aim of our study was to develop a digital synchronous torquer and test it as a challenger of stepper motors coupled to the load through a gear reducer. The synchronous motor is coupled with only one sensor which is generally a resolver, in some cases however other sensors might be used wjth the same performances: the digital system is designed to get such a flexibility. We tested a resolver and a capacitive encoder, which use is compulsory when power djssipation must be mjnjmjzed: spatial applications for example (JL. SABRIE and others,1986; M. GORISSE and others,1986). In all cases a high chopping frequency inverter has been chosen to supply the motor and the torque control is realized by analog current control loops. The digital circuits, mainly the 8086 microcomputer, are dedicated to the autopiloting, the position control, and the treatment of the sensor signals which may be very important with some sensors (that was the case with the capacitive encoder). This paper describes more specifically the control system hardware and software; it compares the results that are got with the conventional resolver and with the capacitive encoder; the equivalent stepper motor performances are approached.

   THREE-PHASE M.O.S TRANSISTORS VOLTAGE INVERTER, WITH NUMERICAL CONTROL, FOR A PERMANENT MAGNET SYNCHRONOUS MACHINE FED BY A PHOTOVOLTAIC GENERATOR
By B. Dakyo; S. astier; G. Sow; L. Protin; G. Fleury [View]
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Abstract: This communication presents the realization of a power Mosfet voltage inverter aimed for feeding a permanent magnet synchronous machine from a photovoltaic generator with digital control. First the authors put emphasis on the advantages of a voltage inverter with PWM ability for photovoltaic pumping system. It provides two freedom degrees for optimizing the energy converting. Then they briefly describe the main features of the digital control and recall various machines feeding modes with voltage inverter: voltage feeding or current feeding. Then, after an estimation of the switches constraints in the application and the resulting technology choice, the Mosfet voltage inverter is described. At last various working modes with the whole set-up including photovoltaic generator are shown.

EPE 1987 - 21 - Lecture Session 3.3: SPECIAL PROBLEMS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1987 - Conference > EPE 1987 - 21 - Lecture Session 3.3: SPECIAL PROBLEMS
	[return to parent folder]

	TRANSIENT RESPONSE OF A RECTIFIED SYNCHRONOUS MACHINE CONNECTED TO AN INDUCTIVE LOAD By J.-F. Ballay; M. Ivanes; R. Feuillet	[View] [Download]
Abstract: This paper reports on the transient behaviour of a rectified synchronous machine, connected to an inductive load. This operation is pointed out to be equivalent with the operation of the machine connected to a variable 3-phase impedance. We call this latter "Transient Equivalent Impedance". The resolution, dealing with the operational calculus through the Park model, leads to transfer functions for analyzing the transient response to an excitation field voltage perturbation. This approach will permit more complicated systems and their regulations to be analysed in further papers.

	AN INTEGRATED APPROACH TO SWITCHED RELUCTANCE MOTOR DESIGN By C. Pollock; B. W. Williams	[View] [Download]
Abstract: This paper highlights the need for good low speed performance from the switched reluctance motor. It investigates several motor configurations and the performance of various power converter circuits. It is shown that an increase in the number of stator poles in a motor allows smoother running at low speeds. The advantages of using the asymmetric bridge as the power switching circuit are discussed. An integrated design approach leads to the development of a "compact converter" which is based on the asymmetric bridge. Performance is predicted using a computer design package and the advantages and disadvantages of various motor and controller combinations are ascertained.

	A SMALL POWER DIGITAL SYNCHRONOUS TORQUER By G. Champenois; Ph. Mollard; J. P. Rognon	[View] [Download]
Abstract: In several applications using small power actuators, a good dynamic and steady state position accuracy is needed, at low speeds and with limited accelerations (scientific instruments, special machine-tools and robots). For these applications stepper motors are commonly used. The aim of our study was to develop a digital synchronous torquer and test it as a challenger of stepper motors coupled to the load through a gear reducer. The synchronous motor is coupled with only one sensor which is generally a resolver, in some cases however other sensors might be used wjth the same performances: the digital system is designed to get such a flexibility. We tested a resolver and a capacitive encoder, which use is compulsory when power djssipation must be mjnjmjzed: spatial applications for example (JL. SABRIE and others,1986; M. GORISSE and others,1986). In all cases a high chopping frequency inverter has been chosen to supply the motor and the torque control is realized by analog current control loops. The digital circuits, mainly the 8086 microcomputer, are dedicated to the autopiloting, the position control, and the treatment of the sensor signals which may be very important with some sensors (that was the case with the capacitive encoder). This paper describes more specifically the control system hardware and software; it compares the results that are got with the conventional resolver and with the capacitive encoder; the equivalent stepper motor performances are approached.

	THREE-PHASE M.O.S TRANSISTORS VOLTAGE INVERTER, WITH NUMERICAL CONTROL, FOR A PERMANENT MAGNET SYNCHRONOUS MACHINE FED BY A PHOTOVOLTAIC GENERATOR By B. Dakyo; S. astier; G. Sow; L. Protin; G. Fleury	[View] [Download]
Abstract: This communication presents the realization of a power Mosfet voltage inverter aimed for feeding a permanent magnet synchronous machine from a photovoltaic generator with digital control. First the authors put emphasis on the advantages of a voltage inverter with PWM ability for photovoltaic pumping system. It provides two freedom degrees for optimizing the energy converting. Then they briefly describe the main features of the digital control and recall various machines feeding modes with voltage inverter: voltage feeding or current feeding. Then, after an estimation of the switches constraints in the application and the resulting technology choice, the Mosfet voltage inverter is described. At last various working modes with the whole set-up including photovoltaic generator are shown.