EPE Association: EPE 1995 - 21 - Lecture Session L6a: SPECIAL DRIVES

EPE 1995 - 21 - Lecture Session L6a: SPECIAL DRIVES
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   NONLINEAR CONTROL FOR DC SERVO MOTORS
By C. P. Ho; S. K. Panda [View]
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Abstract: This paper discuses the simulation results of an input-output feedback linearizing (FBL) and proportional-integral (PI) controllers as applied to drive a dc shunt motor for speed control application. A comparison study of the performance of both the controllers are carried out. It is concluded from the simulation results that feedback linearizing controller provides improved response as compared to PI controller in reducing oscillations, overshoot and settling time during a step change in reference speed or load torque. Moreover, the FBL controller also shows robustness to motor parameter variations.

   DIRECT LINEAR DRIVES FOR VERTICAL TRANSPORTATION
By T. Morizane; E. Masada; H. Hayashiya; H. Ohsaki [View]
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Abstract: For more effective utilization of the land, developments of superskyscrapers and deep underground facilities are planned. The vertical transportation system with high capacity is essentially required for the realization of them. Application of the direct linear drive is studied for the ropeless lift in a super skyscraper as an example. The type of linear motors is compared, based on the requirements of the system. A design study is done with the linear induction motor. The configuration of the drive system and the power conditioner are considered. The technical feasibility of the system is verified. To secure operational safety on the system, the energy storage should be implemented into the drive system. The forced commutated converter should improve energy efficiency of the linear drives.

   Modelling and Field Oriented Position Control of a Helical Reluctance Motor for High Precision Applications
By H. Kellermann; G. Kolper; G. Brandenburg; J. Heinzl [View]
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Abstract: For a helical reluctance motor (HRM), which is a linear direct drive for long distance motions with a positioning accuracy in the submicrometer range, a high-dynamic position control based on the principle of field orientation has been designed and implemented on a DSP system. In· the first step a new, nonlinear mathematical model . was derived which also includes eddy currents and magnetic saturation and which describes the motor as a rotary reluctance motor in the rotor-fixed d-q coordinate frame. Then the system was completely linearized using a simplified inverse model of the eddy currents and saturation in combination with field orientation. With a linear state feedback an equivalent time constant of 5 ms for the closed-loop position control, a dynamic stiffness of 5.5 N/μm and a positioning accuracy of 5 nm have been achieved.

   THE EFFECTS OF TECHNICAL PROGRESS IN MOTOR DRIVES ON PRODUCTS AND ELECTRICAL FACILITIES
By Kenzo Kamiyama; Masashi Hattori; Takashi Sukegawa; Keiji Saito [View]
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Abstract: This paper describes what effects have been made on products and electrical facilities by introducing versatile AC drives in the process control system of major industrial plants and in the equipments in Japan. They are benefiting from AC drives in terms of product quality and yield, power, maintenance and installation space savings, and RAS (reliability, availability, and serviceability), etc. The effects have been investigated by the subcommittee of IEEJ (Institute of Electrical Engineers of Japan). The paper is an interim report based on the investigation.

EPE 1995 - 21 - Lecture Session L6a: SPECIAL DRIVES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 21 - Lecture Session L6a: SPECIAL DRIVES
	[return to parent folder]

	NONLINEAR CONTROL FOR DC SERVO MOTORS By C. P. Ho; S. K. Panda	[View] [Download]
Abstract: This paper discuses the simulation results of an input-output feedback linearizing (FBL) and proportional-integral (PI) controllers as applied to drive a dc shunt motor for speed control application. A comparison study of the performance of both the controllers are carried out. It is concluded from the simulation results that feedback linearizing controller provides improved response as compared to PI controller in reducing oscillations, overshoot and settling time during a step change in reference speed or load torque. Moreover, the FBL controller also shows robustness to motor parameter variations.

	DIRECT LINEAR DRIVES FOR VERTICAL TRANSPORTATION By T. Morizane; E. Masada; H. Hayashiya; H. Ohsaki	[View] [Download]
Abstract: For more effective utilization of the land, developments of superskyscrapers and deep underground facilities are planned. The vertical transportation system with high capacity is essentially required for the realization of them. Application of the direct linear drive is studied for the ropeless lift in a super skyscraper as an example. The type of linear motors is compared, based on the requirements of the system. A design study is done with the linear induction motor. The configuration of the drive system and the power conditioner are considered. The technical feasibility of the system is verified. To secure operational safety on the system, the energy storage should be implemented into the drive system. The forced commutated converter should improve energy efficiency of the linear drives.

	Modelling and Field Oriented Position Control of a Helical Reluctance Motor for High Precision Applications By H. Kellermann; G. Kolper; G. Brandenburg; J. Heinzl	[View] [Download]
Abstract: For a helical reluctance motor (HRM), which is a linear direct drive for long distance motions with a positioning accuracy in the submicrometer range, a high-dynamic position control based on the principle of field orientation has been designed and implemented on a DSP system. In· the first step a new, nonlinear mathematical model . was derived which also includes eddy currents and magnetic saturation and which describes the motor as a rotary reluctance motor in the rotor-fixed d-q coordinate frame. Then the system was completely linearized using a simplified inverse model of the eddy currents and saturation in combination with field orientation. With a linear state feedback an equivalent time constant of 5 ms for the closed-loop position control, a dynamic stiffness of 5.5 N/μm and a positioning accuracy of 5 nm have been achieved.

	THE EFFECTS OF TECHNICAL PROGRESS IN MOTOR DRIVES ON PRODUCTS AND ELECTRICAL FACILITIES By Kenzo Kamiyama; Masashi Hattori; Takashi Sukegawa; Keiji Saito	[View] [Download]
Abstract: This paper describes what effects have been made on products and electrical facilities by introducing versatile AC drives in the process control system of major industrial plants and in the equipments in Japan. They are benefiting from AC drives in terms of product quality and yield, power, maintenance and installation space savings, and RAS (reliability, availability, and serviceability), etc. The effects have been investigated by the subcommittee of IEEJ (Institute of Electrical Engineers of Japan). The paper is an interim report based on the investigation.