Controller and drive circuits for electric motors

A method for controlling a drive circuit for an electric motor, said method comprising:

• controlling an inverter of the drive circuit to supply variable frequency current to the electric motor over a first duration;
• determining to control the drive circuit to transition from supplying variable frequency current to supplying line frequency current to the electric motor;
• measuring at least one parameter of the inverter;
• computing, based on the at least one measured parameter, an adjustment to a default parameter to enable the inverter to reach a threshold output frequency for transitioning to supplying the electric motor with line frequency current;
• and
• operating the inverter based on the computed adjustment to the default parameter.

A motor controller comprising a processor communicatively coupled to a drive circuit of an electric motor, said processor configured to:

• control an inverter of the drive circuit to supply variable frequency current to the electric motor over a first duration;
• determine to control the drive circuit to transition from supplying variable frequency current to supplying line frequency current to the electric motor;
• measure at least one parameter of the inverter;
• compute, based on the at least one measured parameter, an adjustment to a default parameter to enable the inverter to reach a threshold output frequency for transitioning to supplying the electric motor with line frequency current;
• and
• operate the inverter based on the computed adjustment to the default parameter.