Sheng-Ming Yang

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Because the position transducers commonly used in industry, i.e. encoders and resolvers, do not inherently produce an instantaneous velocity measurement, some signal processing technique is generally required to improve the accuracy of velocity estimation at each sample instant. This estimated signal is then used as the velocity feedback signal for the(More)
In servo motor drive applications variation of inertia degrades drive's performance. Motor response is affected not only by external disturbance input but also by mechanical parameters such as inertia and friction. These factors must all be considered in order for accurate inertia identification and drive tuning. In this paper, an observer-based auto-tuning(More)
This paper presented a prototype axial blood pump with a single-axis controlled magnetic bearing. The magnetic suspension system is realized by using passive magnetic bearings for radial direction balancing, and an electromagnetic actuator to stabilize the axial direction actively. A sensor assembly for axial position sensing is also presented. This sensor(More)
In general, unbalanced radial force acting on rotor shaft is undesirable since it causes vibrations. Due to its special structure, the shaft radial force and torque of a three-phase 12/8 switched reluctance motor can be separately controlled by proper selection of pole currents of the energized phase. In this paper, a sinusoidal current excitation scheme is(More)
Due to its special structure, the shaft radial force and torque of a three-phase 12/8 switched reluctance motor can be separately controlled by proper selection of pole currents. When all the pole currents are controlled independently, it is possible to control the radial force to counterbalance the external force acting on the shaft In this paper, a(More)
Due to its special structure, the shaft radial force and torque of switched reluctance motor can be separately controlled by proper selection of pole currents. When all the pole currents are controlled independently, it is possible to produce the required radial force to cancel the existing radial force caused by non-uniform air gap or external load, and(More)