| 摘要 |
PURPOSE:To obtain the accurate primary current command value by obtaining and calculating the actual secondary resistance value of an induction motor during operation to calculate the primary current command value. CONSTITUTION:Whether an elevator cage 9 is elevated at rated value is judged, and when the rated elevation is performed, the output of a voltage detector 15 is applied to a microcomputer 13, which calculates the secondary resistance value r2. When an elevator is automatically stopped, the value r2 is largely different from the value before the automatic stop. Thus, a microcomputer 16 which instructs an elevating mode is added to a pattern generator 12 to allow the microcomputer 16 to calculate to correct the secondary resistance. |
