Abstract
There are numerous applications of Linear Induction Motors (LIM) in industry. More recently, linear positioning servo systems employing LIMs have attracted some interest. This paper describes a method for controlling such motors bydirectionally without deadband. For this purpose, advantage is taken of the double sided construction, which allows separate excitation for each primary. Hence at low speed, two flux waves of opposite direction can be excited, which produce two counteracting forces. At high force levels the mode is shifted to supporting waves, which allows full utilization of the power capability. The LIM is fed through two Thyristor three-phase a.c. controllers. Test results are presented and compared with theoretical considerations. Finally, the plant transfer curve and the control system are briefly analyzed.
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