Method and device for stopping a magnetic suspension centrifuge

A device for stopping a magnetic suspension centrifuge, comprising:

• a stopping state judgment unit, configured to judge a stopping state of the magnetic suspension centrifuge;
• an operating mode switching unit, configured to switch an operating mode of a motor of the magnetic suspension centrifuge from an electrically-powered state mode to a power generation state mode if the stopping state is judged to satisfy a preset condition, so as to convert the inertial mechanical energy of the motor when the motor stops into electric energy, the stopping state is judged to satisfy a preset condition when a bearing or a bearing controller of the magnetic suspension centrifuge is in failure when the magnetic suspension centrifuge stops;
• and
• an electric energy consumption unit, configured to lead the electric energy into a power grid, so as to consume the electric energy, wherein the electric energy consumption unit comprises:
• a DC bus power supply module, configured to supply power to a DC bus of a frequency-conversion cabinet by utilizing the electric energy, such that a pumping voltage is generated on the DC bus;
• and
• a grid module, the grid module comprising a conversion module configured to utilize a four-quadrant controller to convert the pumping voltage into a current with a first phase via an electric reactor, and input the current with the first phase into the power grid, wherein a second phase of the voltage in the power grid and the first phase differ by 180°.