Control method of magnetic suspension air blower

The invention discloses a control method of a magnetic suspension air blower, which comprises the following steps: when the rotating speed of the magnetic suspension air blower reaches a set rotating speed and a pressure relief protection function is enabled, acquiring a current outlet pressure value of the magnetic suspension air blower; when the current outlet pressure value is larger than a pressure protection upper limit value determined by a preset anti-surge curve, it is judged that surge happens to the magnetic suspension air blower, and the valve opening degree of a pressure release valve is increased; when the current outlet pressure value is smaller than or equal to the preset pressure control upper limit value, the valve state of the pressure release valve is kept; when the current outlet pressure value is smaller than the preset pressure protection lower limit value, it is judged that no surge happens to the magnetic suspension air blower, and the valve opening degree of the pressure release valve