| 摘要 |
<p>A controller (100) for a linear induction motor includes sensors (112, 114, 116) for measuring parameters which allow the thrust developed by the linear induction motor to be determined. In one embodiment, a microprocessor (110) receives the output of the sensors and determines the thrust developed by the linear induction motor. The microprocessor also performs operations to determine an updated supply voltage frequency which will cause the linear induction motor to develop thrust having a magnitude closer to the maximum thrust point of the linear induction motor at its given velocity if the determined thrust is less than the maximum thrust. The microprocessor monitors the output of the sensors continuously so that the supply voltage frequency is updated continuously. This permits the linear induction motor to develop thrust near to or at its maximum thrust point at any given speed regardless of changes in the ambient temperature or the linear induction motor secondary characteristics.</p> |
