| 摘要 |
PROBLEM TO BE SOLVED: To perform current limitation control stably and quickly to the change of an operation current value, in full range of operation range, by performing the gain compensation using the primary formula of limited frequency, for the quantity of change of the limited frequency to a motor for a compressor. SOLUTION: A limited frequency computing unit 11 computes stageless limited frequency F1td-f(k) by the sampling value I(k), the command frequency Fset(k) (=Fset), and the tolerable current value Iset(k) (=Iset) from a current measuring instrument 10, and the limited frequency being the last control operation result from a limited frequency storage 12. A gain compensator and processor 18 performs gain compensation by the quantity dFdef-f(k) of the change of limited frequency and the limited frequency F1td(k) stored in the limited frequency storage 12. This computes the quantity dFdef-g(k) of the change of the compensation frequency limitation. Hereby, gain varies with operation frequency can be obtained, and proper current limitation control can be performed. |
