A motor control device, comprising: - a power converter that is configured to convert DC into AC and to supply the AC to a three-phase brushless motor; and - a controller that is configured - to perform an arithmetic operation for voltage command values (V d, V q) of d and q axes of the three-phase brushless motor through feedback control including integral control performed on current deviations (Δl d, Δl q) between current detection values (I d, I q) and current command values (I d *, I q *) of the d and q axes, - to control the power converter on the basis of the voltage command values (V d, V q), - to limit an integrated value (I d **, I q **) in the integral control within a predetermined range, and - to perform an arithmetic operation for defining the predetermined range in accordance with: - the current deviation (Δl d, Δl q), - the integrated value (I d **, I q **), - an electric motor constant of the three-phase brushless motor, - an angular speed detection value (ω r) of the three-phase brushless motor, - control response angular frequencies (ω cdACR, ω cqACR) of the d and q axes, and - voltage upper limit values (V dmax, V qmax,) and voltage lower limit values (V dmin, V qmin) of the d and q axes set on the basis of a power source voltage (Ed) of the power converter. - a power converter that is configured to convert DC into AC and to supply the AC to a three-phase brushless motor; and - a controller that is configured - to perform an arithmetic operation for voltage command values (V d, V q) of d and q axes of the three-phase brushless motor through feedback control including integral control performed on current deviations (Δl d, Δl q) between current detection values (I d, I q) and current command values (I d *, I q *) of the d and q axes, - to control the power converter on the basis of the voltage command values (V d, V q), - to limit an integrated value (I d **, I q **) in the integral control within a predetermined range, and - to perform an arithmetic operation for defining the predetermined range in accordance with: - the current deviation (Δl d, Δl q), - the integrated value (I d **, I q **), - an electric motor constant of the three-phase brushless motor, - an angular speed detection value (ω r) of the three-phase brushless motor, - control response angular frequencies (ω cdACR, ω cqACR) of the d and q axes, and - voltage upper limit values (V dmax, V qmax,) and voltage lower limit values (V dmin, V qmin) of the d and q axes set on the basis of a power source voltage (Ed) of the power converter. - to perform an arithmetic operation for voltage command values (V d, V q) of d and q axes of the three-phase brushless motor through feedback control including integral control performed on current deviations (Δl d, Δl q) between current detection values (I d, I q) and current command values (I d *, I q *) of the d and q axes, - to control the power converter on the basis of the voltage command values (V d, V q), - to limit an integrated value (I d **, I q **) in the integral control within a predetermined range, and - to perform an arithmetic operation for defining the predetermined range in accordance with: - the current deviation (Δl d, Δl q), - the integrated value (I d **, I q **), - an electric motor constant of the three-phase brushless motor, - an angular speed detection value (ω r) of the three-phase brushless motor, - control response angular frequencies (ω cdACR, ω cqACR) of the d and q axes, and - voltage upper limit values (V dmax, V qmax,) and voltage lower limit values (V dmin, V qmin) of the d and q axes set on the basis of a power source voltage (Ed) of the power converter. - the current deviation (Δl d, Δl q), - the integrated value (I d **, I q **), - an electric motor constant of the three-phase brushless motor, - an angular speed detection value (ω r) of the three-phase brushless motor, - control response angular frequencies (ω cdACR, ω cqACR) of the d and q axes, and - voltage upper limit values (V dmax, V qmax,) and voltage lower limit values (V dmin, V qmin) of the d and q axes set on the basis of a power source voltage (Ed) of the power converter.