Mamoru Takaki

Development of stator-magnetless linear synchronous motor for sensorless control

Sensorless control technique is desired in applications of a long stroke linear synchronous motor (LSM) without using a linear scale. This paper discusses the development of a stator-magnetless LSM (no magnet mounted on the stator of LSM) for sensorless control technique that includes a high speed position estimation algorithm based on magnetic hysteresis phenomenon. This paper presents the new structure of a flux-switching LSM to achieve a high saliency ratio by designing a cutout which causes magnetic saturation in the armature core. The effect of sub-teeth to reduce cogging thrust is also presented. Furthermore, this paper also reports the analytical and experimental characteristics of inductance, thrust, cogging thrust, and sensorless control drive using a prototype.

Development of a Stator-Magnetless Linear Synchronous Motor for Sensorless Control

Sensorless control technique is desired in applications of a long stroke linear synchronous motor (LSM) without using a linear scale. This paper discusses the development of a stator-magnetless LSM (no magnet mounted on the stator of LSM) for sensorless control technique that includes a high speed position estimation algorithm based on magnetic hysteresis phenomenon. This paper presents the new structure of a flux-switching LSM to achieve a high saliency ratio by designing a cutout which causes magnetic saturation in the armature core. The effect of sub-teeth to reduce cogging thrust is also presented. Furthermore, this paper also reports the analytical and experimental characteristics of inductance, thrust, cogging thrust, and sensorless control drive using a prototype.

Saliency-based Sensorless Drive of Adequate Designed 1PM Motor for Robot Vehicle Application

Technology fusion between motor design and control can produce new applications. This paper introduces a saliency-based sensorless drive of adequate designed IPM motor for a specific application in a robot vehicle. The motor is designed considering both configuration so as to fit to the application and the electromagnetic feature to be better adapted to saliency-based sensorless control. The speed and position synchronous control for each wheel-motor in entire speed ranges including zero speed is realized by a single motion controller and drive-amps for individual motors. Finally, two types of robot vehicle, one being a two-wheel deferential drive and the other being an omni direction drive, are developed to transport objects and human. The paper mainly focuses on the concept of motor design and its control. Some analysis and test data are shown in this paper.