Abstract
In the Signal-collecting in Sensorless PMSM Parameters Identification research appeared Voltage signal and Current signal are not common ground. In-depth study the problem and solved it. In order to solve the problem that Voltage signal and Current signal are not common ground, using Linearity of coupler element, Through the optical coupling element not only achieve a high and low pressure isolation and through a series of analog circuit to achieve the output terminal to the common ground. Input pressure value falls below the voltage data acquisition card allows the range of values. We verify the validity of this approach by multisim simulation software to.
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