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Sensorless control techniques that do not use a linear scale are desired for applications that require a long-stroke linear synchronous motor (LSM). This paper discusses the development of a stator-magnetless LSM (i.e., no magnet is mounted on the stator of the LSM) for sensorless control that includes a high-speed position estimation algorithm based on the magnetic saturation phenomenon. This paper...
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...
In the field of the manufacturing industry, it has been often discussed that high-mix low-volume manufacturing is required to meet a variety of customer needs. In such a situation, cellular manufacturing and U shaped production lines are often adopted. Linear synchronous motors (LSMs) are appropriate to realize U shaped automation lines because of its strong features such as flexibility of layout,...
This paper presents the following two methods based on torque sensor feedback: new position sensorless control method for surface-mounted permanent magnet synchronous machines (SPMSMs) and torque ripple compensation. The position sensorless techniques can be classified into two categories: the techniques based on the back electromotive force (back-EMF) and the techniques based on the high frequency...
This paper proposes a method which enables wheeled robot to climb a step that is higher than the radius of the wheel. In conventional method, the velocity at the moment of impact and impact force must be increased in order to climb the step, which causes troubles of wheeled robot. This paper proposes a method utilizing variable loads arised by changing speed and anti-dive force from suspension to...
This paper proposes a method which enables wheeled robot to climb a step that is higher than the radius of the wheel. In conventional method, this is impossible, because driving force of front wheel is not enough. This paper proposes a method utilizing the moment of impact between the wheel and the step to maximize the normal force, and hence the driving force of the front wheel. Effectiveness of...
The PWM converter includes a low-pass filter in order to remove the high-frequency current that flows to the power grid. The low-pass filter is composed of two reactors and a capacitor (LCL-filter). The LCL-filter is the gain characteristic that attenuates by the high frequency band, and can eliminate the career ripple of the current. However, LCL-filter has a strong resonance characteristic. When...
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