| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor control device, a motor control method, and a program capable of suppressing occurrence of an overcurrent state of an inverter in V/f control of a motor.SOLUTION: A motor control device 1 comprises: a voltage command unit 3 that designates a voltage command proportional to a speed command for a motor 7 by two axes of a rotation rectangular coordinate system; a 2-phase/3-phase conversion unit 4 that performs coordinate conversion of the 2-axis voltage command into a 3-phase voltage command; an inverter main circuit 5 that applies a 3-phase applied voltage to the motor 7; a current detection unit 6a that detects a 3-phase terminal current flowing in the motor 7; and a 3-phase/2-phase conversion unit 6 that performs coordinate conversion of the 3-phase terminal current into a 2-axis current component that forms a motor current and feeds it back to the voltage command unit 3. The motor control device 1 further comprises: a speed command correction unit that reduces the speed command at a predetermined speed reduction rate that is preliminarily defined, depending on a relation between a current threshold that is preliminarily defined on the basis of a current restriction value of the inverter main circuit 5 and an absolute value of the motor current specified from the 2-axis current component.SELECTED DRAWING: Figure 1 |
