For the problem of the energy loss when the simple pendulum was swinging, the experimental methods for energy compensation had been proposed. The methods were based on a swing sensor for energy compensation automation and the simple pendulum swing for a long time. There were three methods. The first one was that the slider was embedded in the spiral groove of the screw axle. The screw axle was coaxial with the stepper motor. When the stepper motor was rotating, the slider was raising or falling. The second one was that the swing sensor sent an instruction to the controller for the slider. The slider would be fallen slowly after the controller accepted the instruction. When the slider was at the lowest position the slider was raised rapidly. When the simple pendulum swung to the highest displacement, the swing sensor sent an instruction to the controller again and the slider fell and rose. The simple pendulum swung for a long time. The third one was that the rotation angles of the axle of the stepper motor were controlled by the pulse number of the controller. The rising speed and the falling speed of the slider were different. The rotation speed of the axle was controlled by the pulse frequency of the controller. The slider was falling slowly and was rising rapidly. The methods were effective for energy compensation automation and the simple pendulum swung for a long time.
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