FLAT LINEAR INDUCTION MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a controller for linear induction motor which can attain more confortable rides by eliminating generation of vibration in a driven body such as a vehicle and an elevator cage and attain highly efficient operation. SOLUTION: A flux pattern generating part 13 generates a flux reduction coefficient Kϕ* corresponding to the thrust command F* of a driven body and reduces an exciting current command Io with a multiplier 14, increases a torque current command IT with a divider 16 in inversely proportional to the flux reduction coefficient, and obtains slip frequency Ωs through a slip calculating part 17 from the exciting current command and a torque current command for vector control. The flux reduction coefficient is a pattern proportional to the thrust command or its square root, and is limited by a limiter or the like in a low speed range.