Current ripple based intelligent pseudo speed measurement for vibration motor in mini-scale production line by the periodic convolution technique

In this paper, the vibration motor in the vibrating process control is investigated. A smart pseudo speed sensor technique through detecting the current ripple is suggested. By this approach, the practical speed sensor such as optic encoder is not required. Based on the proposed mathematical transient modeling, the current ripple can be precisely predicted. Periodic convolution is used to derive the inductance for the current ripple. In order to get the detailed information from the current ripple, a transient model to detect the speed condition is required. By observing the frequency of the current ripple, the speed information without using additional speed sensor can be obtained. Such technique can be applied to replace the traditional speed encoder. Therefore, the manufacturing cost for the mini-scale production line can be reduced by the proposed intelligent mechatronical approach