Single-phase induction motor drive system and motor drive method

A single-phase induction motor drive system, comprising:

• a single-phase induction motor comprising a stator and a rotor;
• and
• a processor coupled to the stator, and configured to provide a power command to the stator, wherein the processor is configured to obtain a frequency variation curve, the frequency variation curve is configured to indicate a plurality of set frequencies corresponding to different times, and comprises a target frequency corresponding to a time when the single-phase induction motor is in stable operation;
• wherein the processor is configured to determine the following conditions to provide the power command:
• setting the present frequency of the power command with an initial frequency, such that the stator is configured to drive the rotor through the power command, wherein the initial frequency is less than the target frequency;
• when one of the plurality of set frequencies corresponding to the present time is greater than the initial frequency, changing to control the present frequency of the power command according to the frequency variation curve;
• when one of the plurality of set frequencies corresponding to the present time is less than or equal to the initial frequency, maintaining the present frequency of the power command at the initial frequency, and determining whether an output current to the stator is greater than or equal to a current threshold;
• when the output current to the stator is greater than or equal to the current threshold, fixing the present voltage of the power command;
• and
• when the output current to the stator is lower than the current threshold, increasing the present voltage of the power command.