| 摘要 |
PROBLEM TO BE SOLVED: To accurately estimate the electrical constant of an electric motor in a total speed range and to achieve accurate torque control by outputting a conversion coefficient for matching constant identifier output to constant estimator output by a mode decision device output, the constant identification device output, and the constant estimation device output. SOLUTION: A constant estimation device 9 inputs the stator temperature of an electric motor 2 and a conversion coefficient K of a conversion coefficient adjuster and outputs the electrical constant of the electric motor 2 as C2. The mode decision device 11 sets an output signal M to a high-speed mode when a rotary speed N of the electric motor 2 of the output of a speed detector 6 is larger than a given value, and sets the output signal M to a low-speed mode when the rotary speed N is smaller than the given value. A selector 12 selects C1 when the output M of the mode decision device is in the high-speed mode, and selects C2 when M is in the low-speed mode before outputting to a torque controller 7 as an electrical constant C. A modulation coefficient adjuster 10 adjusts a conversion coefficient K that is used by the constant estimator 9 according to temperature so that C1 coincides with C2 when the output M of the mode decision device is in the high-speed mode. |
