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ISSN : 1226-9654

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Vol.4

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A Design of Step Motor Controller for Positioning Microelectrodes

The Korean Journal of Cognitive and Biological Psychology / The Korean Journal of Cognitive and Biological Psychology, (P)1226-9654; (E)2733-466X
1992, v.4, pp.7-13
Sooyoung Chung (Dept. of Psychology Seoul National University)
Choongkil Lee (Dept. of Psychology Seoul National University)
Chung, S., & Lee, C. (1992). A Design of Step Motor Controller for Positioning Microelectrodes. The Korean Journal of Cognitive and Biological Psychology, 4, 7-13.

Abstract

A design of an inexpensive micropositioner using a step motor controller is described. The rotation of the motor is translated into linear movement by a micrometer head. The rotation is transmitted through a piano wire with a high torsional stiffness conveniently absorbing the eccentricity and deviation angle of the two rotating axes common mechanical problems which can be expensive to correct. Two circuits were developed to control the step motor and to display cumulative rotation, i.e. linear movement. The control circuit was designed around a hybrid IC chip for an inexpensive chopper drive. The resolution of the micropositioning system, thus developed was 1.25㎛. More than 70 penetrations of tungsten-in-glass micro electrodes into deep and shallow brain structures, such as the superior colliculus or the visual cortex, were made in 4 cats, using the developed micropositioner. From these experiments the system was found to be reliable and satisfactory.

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The Korean Journal of Cognitive and Biological Psychology

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