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The phase-locked-loop technique has many advantages when applied to speed control. However, there is the problem of controlled operation outside lock conditions when a variable-frequency induction motor is used. The paper proposes the application of a slip-frequency limit circuit in the forward loop to overcome this problem. Experimental results are provided in support of this method.
Control Theory and Applications, IEE Proceedings D (Volume:127 , Issue: 2 )
Date of Publication: March 1980