Abstract. Ways to minimize vibration in optomechanical modules with stepper motors are considered. Differential equations describing the stepper motor vibrations when module stops (transmission without self-locking) are derived. Reducing vibration at the engine stops is provided by changing the unit design parameters. Coincidence of the module eigenfrequency with a frequency of electrical pulses of the stepper motor drive is investigated. An example of modal analysis of the construction in the finite-elements workbench ANSYS is demonstrated. Changing the construction eigenfrequencies with additional ribs and attachment points is shown to reduce vibration. Presented results of calculations and analysis are obtained for the example of the automated ballistic identification scanner EVOFINDER.

Keywords: oscillations, vibration, stepper motor, optomechanical module, modal analysis, ballistic scanner, EVOFINDER

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