Saturation preventing self-adaptive phase compensation method for brushless DC motor and control device thereof

The invention discloses a saturation preventing self-adaptive phase compensation method for brushless DC motor and a control device thereof. The device includes a drive circuit, a power circuit, an interface circuit and a control circuit. The control circuit is connected between the interface circuit and the drive circuit. When performing phase angle compensation, a first compensation phase angleTheta c1(k) is calculated according to the output voltage of a speed control circuit and a preset reference voltage; a second compensation phase angle Theta c2(k) is calculated by utilizing a first formula when the first compensation phase angle Theta c1(k) is larger than a preset maximal compensation phase angle Theta cmax, wherein the first formula is as following: Theta c2(k)= Theta c1(k)+Ki*(Theta cmax-Theta c1(k)); Ki is an integral coefficient, and i, k are both natural numbers; the drive circuit is adjusted according to the second compensation phase angle Theta c2(k) so as to drive thebrushless DC motor to work