Toshio Kakinoki

Study on generation of harmonic voltage using synchronous machine with d-axis and q-axis harmonic field windings - part 2

We investigated the harmonic voltages generated by a synchronous machine adding d- and q-axis harmonic field windings to reduce the harmonics in a power line. First, electronic circuits such as a frequency multiplier, band-pass filter, and phase shifter were newly designed and made to carry out the experiment. Next, an experimental circuit, for which an AC voltage of frequency 6f synchronized to the power line voltage of frequency f could be obtained, was constructed to examine the generation of harmonic voltage in more detail. Finally, an experiment involving the generation of harmonic voltage was performed using an experimental synchronous generator with harmonic windings in the d- and q-axis. In this paper, the experimental results on the generation of harmonic voltage by the synchronous machine are presented.

Load variation characteristic of magnetically levitated vehicle with hybrid magnets

This paper reports the experimental results of the load variation characteristics of a magnetically levitated vehicle with hybrid magnets, which we studied in place of street cars and conveyor systems. Magnetically levitated systems have the following advantages: no bearings, no wheels, no noise, no air pollution and low maintenance. We propose new constructive electromagnets and magnetic rails. The magnetically levitated part must be cordless and the power source has involve Ni-MH AA size rechargeable batteries. As a experimental result, the number of dry cell batteries is increased with increasing load.

Load characteristics of a magnetically levitated system with hybrid magnets

This paper reports the experimental results of the load characteristics of a magnetically levitated system with hybrid magnets, which we studied to replace street cars and conveyor systems. The new magnetically levitated system proposed here is low cost, easy to make, and energy saving. This system operates using AA-size dry-cell batteries. The application of pull-up-type magnetically levitated vehicles will be useful for free path track design and smooth running. The load experimental results are shown.

Characteristics of a magnetically levitated vehicle using a small number of dry cell batteries

An experimental vehicle of 20kg was magnetically levitated using a small number of dry-cell batteries, which consisted of 10 Ni-MH cells of 1900mAh in series. The magnets were activated sequentially, because the internal resistance of the batteries suppressed the maximum current. The vehicle was kept levitating for about 2 hours and was stable against disturbance due to instantaneous external force.