Systems and methods for active damping of a motor

A method comprising:

• controlling, by a control system, a first power output to an electric machine during a transient event, comprising:
• measuring values of the first power output provided to the electric machine during the transient event;
• receiving, by a controller, an estimated speed input of the electric machine;
• determining, by the controller, adjustment commands to compensate the first power output for the transient event of the electric machine, wherein the adjustment commands are based on the estimated speed input and measured values of the first power output during the transient event;
• generating, by a modulator, switch commands for gate drives of a variable frequency drive (VFD) based at least in part on the adjustment commands;
• and
• modifying, by the VFD, the first power output during the transient event based on the switch commands;
• wherein the transient event is a torque change of the electric machine greater than a torque threshold over a threshold period or a speed change of the electric machine greater than a speed threshold over the threshold period.

A control system comprising:

• a primary variable frequency drive (VFD) configured to receive power from a power source and to output a variable voltage and variable amplitude AC signal to a transformer configured to output a stepped up AC signal to a permanent magnet motor;
• and
• synchronization circuitry disposed between the transformer and the permanent magnet motor, wherein the synchronization circuitry is configured to receive the stepped up AC signal from the transformer, wherein the synchronization circuitry comprises:
• one or more sensors configured to measure the current and the voltage of the stepped up AC signal;
• and
• a controller coupled to the one or more sensors, wherein the controller is configured to:
• determine a power of the stepped up AC signal from the measured current and the measured voltage during a transient event of the permanent magnet motor, wherein the transient event is a torque change of the electric machine greater than a torque threshold over a threshold period or a sped change of the electric machine greater than a speed threshold over the threshold period;
• determine torque changes during the transient event from an estimated speed of the permanent magnet motor and the power of the stepped up AC signal;
• determine adjustment commands to adjust the stepped up AC signal based at least in part on a first compensator output of a proportional compensator applied to the torque changes;
• and
• control a supplemental AC signal from a secondary VFD based at least in part on the adjustment commands, wherein the supplemental AC signal is added to the stepped up AC signal and is configured to stabilize operation of the permanent magnet motor during the transient event.