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This study proposes a novel stair-climbing wheelchair based on lever propulsion control using the human upper body. Wheelchairs are widely used as supporting locomotion devices for people with acquired lower limb disabilities. However, steps and stairs are critical obstacles to locomotion, which restrict their activities when using wheelchairs. Previous research focused on power-assisted, stair-climbing...
The 10poles-12slots brushless DC motor is superior as AC servo motor by sine-wave excitation, but its characteristics like efficiency get worse by using as BLDC motor by square-wave excitation. However, 150 degree excitation which adjusted excitation angle and excitation phase can increase 3% of efficiency from general 120 degree excitation, and it can make phase current similar to sine wave. And...
SRM is possible to high output by high speed drive. However, efficiency decreases for increase of iron loss in high speed drive. Therefore, reduction of iron loss is necessary for high efficiency drive. And, we aim to improve of efficiency by electromagnetic steel sheet of low iron loss. We thought Si6.5% electromagnetic steel sheet is suitable to high speed drive application, because Si6.5%material...
The motor is desirable high efficiency, because it is consuming about 50% electrical energy. Therefore, Permanent Magnet Synchronous Motor (PMSM) is gathering attention and being widely applied. The vector control of PMSM must have information of magnet pole position. So, it is necessary to attach position sensor. However, several problems occurs by attaching a position sensor. For example that degradation...
Compared to conventional visual- and auditory-based assisted driving technologies, haptic modality promises to be more effective and less disturbing assistance to the driver. However, in most previous studies, haptic assistance systems were evaluated from safety and stability viewpoints. Moreover, the effect of haptic assistance on human driving behavior has not been sufficiently discussed. In this...
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