The Rotary Magnetostrictive Motor: a Promising Solution for Low Power Actuators
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2018, Vol 42, Issue 0
Abstract
This paper contains a theoretical and experimen-tal study on rotary magnetostrictive motor, performed with the purpose of determining the optimal conditions of opera-tion. The two main types of magnetostrictive motors known from the literature, inchworm respectively resonance present the advantage of large and accurately controlled developped torques for low speed values. The electromagnetic torque developed by the rotary magnetostrictive motor being proportional to the frequency of the current circulating through its inductor, became the subject of frequency control methods. This fact lead to the idea of controlling the torque by controlling the frequency of the current, with direct implication in the domain of torque-controlled drives. Although the actuator represents the central part of any magnetostrictive device, the entire magnetic circuit configuration determines the position of the permanent magnet operating point on the linear portion of the magnetostrictive characteristic. The paper includes two different methods, applied for the permanent magnet operating point allocation. The magnetostrictive torque was determined and ex-pressed as function of time, for the full cycle of the periodical current carried by the actuator’s coil. The cycle of the magnetostrictive torque is identical with the cycle of the periodical current circulating through the coil of the actuator. The analytical mathematical model developed and presented in the paper considers both regimes, starting and running, making possible the tracking of the operation point. Furthermore, was possible to determine the moment of separation between the rotor disk and the flexible friction element. Several acquired data, recorded at different values of power supply frequency, demonstrate a good correlation between the theory and experiment.
Authors and Affiliations
Alexandru Dalea, Mircea Ignat, Sorin Deleanu, Mihai Iordache, Neculai Galan
Keywords
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