Cheng-Tsung Liu

On the design of a disc-type surface-mounted permanent magnet motor for electric scooter application

The design of a single-sided disc-type surface-mounted permanent magnet motor for electric scooter application is presented. The motor is aimed at providing easier construction and direct driven capability compared with commonly used brushless DC motors; hence an in-wheel type motor structure can be achieved. The hardware design and theoretical modeling procedures are described in detail, along with appropriate field-oriented control framework designs for providing practical system application requirements.

Development of an Automatic On-line Gap Detection Scheme for Levitated Industrial Steel Plate Conveyance System

For stabilizing the steel plate conveyance process, efforts on providing appropriate extra electromagnetic forces at the run-out-table of a steel mill have been extensively investigated. Such objectives can be achieved by implementing fixed poles on top of the rollers at the run-out-table to provide the controllable two-dimensional (2D) lift and propulsive forces, and the movable steel plate can then be driven to the desired directions. To realize the entire process, by considering the operational environment at a steel mill, an image-based on-line gap detection scheme with real-time parameter adjustment process has been developed. Results show that the system, which being implemented with a fine-tuned interfacing/processing scheme, can supply rapid and accurate on-line 2D gap profile and thus fulfil the design and on-site operational objectives

Applications of digital image processing technique for steel mill non-contacting conveyance system operations

This paper provides a feasibility evaluation of applying the optical inspection system to provide accurate and rapid on-line gap measurements for a specially designed non-contacting steel plate conveyance structure in a steel mill. Framework of the conveyance system has been designed based on a linear induction motor configuration with sets of stator primary windings being energized to supply desired fluxes, while the steel plate is operated as the movable secondary that can be both lifted and conveyed to the designated directions. The optical inspection system at a steel mill is commonly employed to determine the dimension accuracy of produced steel plate. Based on such scheme, preliminary investigation of using the optical inspection system to the on-line dynamic gap measurements of a laboratory non-contacting conveyance system operations have been successfully performed. More complicated software and hardware data filtering and adjustments based on digital image processing techniques have been adapted to the entire system formulation and estimation. Results show that the system, which being implemented with a fine-tuned interfacing/processing scheme, can supply accurate and rapid gap measurements and thus fulfil the design and field operational objectives.

Optimal operational strategy design of a single-sided permanent magnet axial-flux motor for electrical vehicle application

This paper will present a systematic scheme to determine the optimal operational strategy of a single-sided permanent magnet axial-flux motor (SPMAM), based on the associated motor winding current and speed constraints. For possible electrical vehicle application, maximized rotational force of this motor while maintaining minimized axial force simultaneously is desired. Such objectives can be achieved by properly adjusting the portions of motor stator winding currents projected onto the orthogonal sets of axes corresponding to the rotor positions, and the realizations of the proposed scheme is confirmed by detailed analytical and experimental studies.

Feasibility assessments and designs of a hybrid suspension system for motorbike application

To effectively retrieve the inherent vibration energies, feasibility of replacing those common mechanical shock absorbers of the suspension system that are mounted between the wheels and bogie of a motorbike with electromagnetic motion device will be assessed. Instead of consuming additional energies to control the vibration patterns, the main design objectives are to produce the suspension forces to meet the maximum encountered force specifications, and to convert the input mechanical vibrations to electric energies directly. Based on proper emulation designs and electrical output controls, the operational fluxes and dynamic characteristics of this hybrid suspension system at various operational conditions will be thoroughly investigated, and the satisfactory performances of the proposed system can then be systematically validated.

Applications of Optical Image Processing Technique for Steel Mill Non-contacting Conveyance System Operations

This paper provides a feasibility evaluation of applying the optical inspection system to provide accurate and rapid on-line gap measurements for a specially designed non-contacting steel plate conveyance structure in a steel mill. Framework of the conveyance system has been designed based on a linear induction motor configuration with sets of stator primary windings being energized to supply desired fluxes, while the steel plate is operated as the movable secondary that can be both lifted and conveyed to the designated directions. The optical inspection system at a steel mill is commonly employed to determine the dimension accuracy of produced steel plate. Based on such scheme, preliminary investigation of using the optical inspection system to the on-line dynamic gap measurements of a laboratory non-contacting conveyance system operations have been successfully performed. More complicated software and hardware data filtering and adjustments based on digital image processing techniques have been adapted to the entire system formulation and estimation. Results show that the system, which being implemented with a fine-tuned interfacing/processing scheme, can supply accurate and rapid gap measurements and thus fulfil the design and field operational objectives.

On the fuzzy-based force control designs of a induction motor for non-contacting industrial steel plate conveyance system application

To design a stable and fully-controllable process for steel plate conveyance with less noise, feasibilities of incorporating the linear induction motor scheme have been intensively investigated. By implementing appropriate fixed poles on top of the rollers at the run-out-table of a mill, controllable two-dimensional forces can thus be provided to drive the movable steel plate to the desired directions. An on-line strip-based force estimation scheme combined with fuzzy-based controller has been developed, along with numerical and experimental verifications to show the adequacy of the proposed system for practical applications.

Design and operational analyses of an electromagnetic hybrid shock absorber system for scooter application

To effectively harvest the inherent vibration energies, feasibility of replacing those common mechanical shock absorbers that are mounted between the wheels and bogie of a scooter with electromagnetic motion device will be assessed. Instead of consuming additional energies to control the vibration patterns, the main design objectives are to produce the suspension forces to meet the maximum encountered force specifications, and to convert the input mechanical vibrations to electric energies directly. Based on proper emulation designs and electric output controls, the operational fluxes and dynamic characteristics of this hybrid suspension system at various operational conditions will be thoroughly investigated, and the satisfactory performances of the proposed system can then be systematically validated.

Three-dimensional force analyses of an axial-flow radial-flux permanent magnet motor with magnetic suspension

This paper will provide a thorough evaluation of a specially designed axial-flow radial-flux permanent magnet motor for cooling fan applications. With a passive magnetic suspension segment implemented, the design objective of this motor is to provide a stable guidance force in its axial direction, such that the vibration effects at the entire rotor operational positions can be minimized and the net radial forces applied onto associated bearing system can be alleviated. Supported by dynamic magnetic circuit modeling and static/quasi-dynamic three-dimensional finite element analyses, the operational forces of such motor, either with or without magnetic suspension, at its respective radial, axial, and tangential directions will all be evaluated. Results show that the motor, which being implemented with a low-cost passive magnetic suspension segment, can supply excellent operational characteristics and thus enhance the operational reliability.

An Efficient Electromagnetic Model for Operational Behavior Predictions of a Non-contacting Industrial Steel Plate Conveyance System

In this paper, a model is developed for operational behavior predictions of a non-contacting industrial steel plate conveyance system under the assumptions that the 1.) permeability of the stator is infinite; 2.) permeability of steel plate is almost equal to the air; and 3.) end effects can be neglected.