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i am doing a project where i have to control the speed of a 3phase induction motor. i need to model this induction motor which is connected to a variable speed drive. am i forced to use vector space modelling to find the transfer function where i have frequency as input and velocity as output. please i am not at ease with vector space modelling, is there any other way to find the transfer function required, or can anybody help me to model it, or give me a copy of an existing model?