Accelerated verification method for the reliability of the motor drive mechanism of the corn precision seed-metering device

Abstract

The current reliability analysis of the motor drive mechanism of the corn precision seed-metering device has yet to be validated by accelerated testing. Furthermore, the bench test used for verification does not consider the effect of vibration loads on the seeder during field operation. Therefore, this paper proposes an accelerated reliability verification method for the motor drive mechanism of the corn precision seed-metering device. Firstly, reliability theory is used to analyze the importance degree of motor drive system subcomponents. Then, various field tests were carried out to collect vibration and temperature rise data, to analyze the effect of field vibration on the motor drive mechanism, and to propose the vibration influence parameter k. Finally, an indoor test bench was set up, the formula of the acceleration factor A was modified, and accelerated verification tests on 96 motors were carried out to verify the method's accuracy. Reliability analysis showed that the motor’s importance degree was 79.31%, and the Hall switch was 19.78%. The field tests showed that the mean values of the vibration influence parameter k for the four seeding conditions (different seeding speeds) were 0.155, 0.186, 0.207 and 0.228. The accelerated tests showed that the absolute error between the accelerated verification test and the reliability analysis was 1.1% and 3.3% in importance degree and average life, respectively. This paper provided a solution for the reliability study and accelerated verification of the corn electric drive seed discharge mechanism.