Starting method of 3-phase induction motor and decanter type centrifugal separator

The invention provides a starting method of a 3-phase induction motor. Compared with a basic starting method, the starting method is advantaged in that the temperature increase amplitude of the 3-phase induction motor during the starting process of a decanter type centrifuge can be reduced. By means of the starting method of the 3-phase induction motor, a revolving drum of a decanter type centrifugal separator carrying out centrifugal separation on an object to be processed rotates faster from a stop state to a target speed. The starting method is characterized in that by employing a star connection mode, a power supply is electrically connected with the 3-phase induction motor, a thyristor is employed to shear waveform of voltage supplied from the power supply to the 3-phase induction motor while the 3-phase induction motor is started, furthermore, when the current effective value of the 3-phase induction motor is reduced in the starting process, a process for increasing the conduction angle of the thyristor