@article{oai:soar-ir.repo.nii.ac.jp:00013031,
 author = {坂口,  博巳 and 松山,  潔},
 journal = {信州大学工学部紀要},
 month = {Jul},
 note = {In order to design the speed control system of a d. c. motor, we at first, need to convert the speed into control signal by means of any transducer. Among other things, a tachogenerator has widely been used. By the way, we necessarily have to concider whether it's suitable or not to use the tachometer of this type in the case of the speed control which must be done accurately over wide range of speed. This control system seems to be simple at first sight, but even now has some problems which must been taken into account. And to set up the control circuit, we must grasp the characteristics of the d. c. motor (with the load) and those of the feed back system by using the tachgenerator. As to the latter, firstly, in this paper we were presented the results of analytical considerations with some empirical data. The problems that we considered are how to deal with the nonlinear characteristics of the tachometer and rectifier circuit and how to find the transfer functions of the feedback system. Here we concluded that in a cirtain required region of the speed, we could linearize the system and show the transfer function. The trend of the curves of e. m. I. voltages and input impedances is slightly saturated. And errors in the linearization of these characteristics are about ten percent in the ranges of 1500 r. p. m. on the lower part of the speed, and of 3000 r. p. m. on the higher part (over 5000 r. p. m.) respectively. The part of the rectifier and the smoothing circuit could be l inearized from the result of the succession of transient analysis, also within ten percent error in comparison with the empirical data., Article, 信州大学工学部紀要 28: 77-88 (1970)},
 pages = {77--88},
 title = {小形直流モーターの回転制御に関する研究（第1報）：Tachogenerator による回転対電圧変換特性の考察},
 volume = {28},
 year = {1970}
}