One exemplary embodiment is method of operating an electrically excited synchronous machine (EESM) system. The system includes a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a controller operatively coupled with the converter and the exciter, and a power supply operatively coupled with the converter and the exciter. The controller determines whether a power supply fault condition exists and whether EESM system is operating in a motor mode or a generator mode. If the power supply fault condition exists and the EESM system is operating in the motor mode, entering one of a motor ride through control mode and a motor controlled braking control mode If the power supply fault condition exists and the EESM system is operating in the generator mode, entering one of a generator ride through control mode and a generator controlled braking control mode.

One exemplary embodiment is method of operating an electrically excited synchronous machine (EESM) system. The system includes a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a controller operatively coupled with the converter and the exciter, and a power supply operatively coupled with the converter and the exciter. The controller determines whether a power supply fault condition exists and whether EESM system is operating in a motor mode or a generator mode. If the power supply fault condition exists and the EESM system is operating in the motor mode, entering one of a motor ride through control mode and a motor controlled braking control mode If the power supply fault condition exists and the EESM system is operating in the generator mode, entering one of a generator ride through control mode and a generator controlled braking control mode.

A motor control method according to an embodiment of a present invention comprises the steps of: performing three-phase commutation in a first range section of a motor rotational speed in a brake mode of a motor; performing two-phase commutation in a second range section of the motor rotational speed performing one-phase commutation in a first range section of the motor rotational speed; and turning off commutation when the motor rotational speed is less than or equal to the first range section.

A motor control method according to an embodiment of a present invention comprises the steps of: performing three-phase commutation in a first range section of a motor rotational speed in a brake mode of a motor; performing two-phase commutation in a second range section of the motor rotational speed performing one-phase commutation in a first range section of the motor rotational speed; and turning off commutation when the motor rotational speed is less than or equal to the first range section.

One exemplary embodiment is method of operating an electrically excited synchronous machine (EESM) system. The system includes a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a controller operatively coupled with the converter and the exciter, and a power supply operatively coupled with the converter and the exciter. The controller determines whether a power supply fault condition exists and whether EESM system is operating in a motor mode or a generator mode. If the power supply fault condition exists and the EESM system is operating in the motor mode, entering one of a motor ride through control mode and a motor controlled braking control mode If the power supply fault condition exists and the EESM system is operating in the generator mode, entering one of a generator ride through control mode and a generator controlled braking control mode.

One exemplary embodiment is method of operating an electrically excited synchronous machine (EESM) system. The system includes a converter operatively coupled with one or more stator windings, an exciter operatively coupled with one or more field windings, a controller operatively coupled with the converter and the exciter, and a power supply operatively coupled with the converter and the exciter. The controller determines whether a power supply fault condition exists and whether EESM system is operating in a motor mode or a generator mode. If the power supply fault condition exists and the EESM system is operating in the motor mode, entering one of a motor ride through control mode and a motor controlled braking control mode If the power supply fault condition exists and the EESM system is operating in the generator mode, entering one of a generator ride through control mode and a generator controlled braking control mode.

Systems, method, and computer readable medium are provided for producing a DC output, comprising: a turbine for generating a variable AC from a variable flow; a rectifier for converting the variable AC to a variable first DC; a first DC-DC associated with a storage component; a second DC-DC associated with an inverter; a dual mode circuit for alternately toggling between the first DC-DC and the second DC-DC; and a controller for: operating the circuit to store the first DC in the storage component when the first DC is below a target level, and release energy at the target level using the first DC-DC when the energy reaches the target level; operating the circuit to convert the variable DC to the target level using the second DC-DC when the variable DC is above the target level; and output a target level DC including the released energy or the second DC.

There is provided a piling hammer comprising a linear electric machine comprising a mover connected to a ram block for striking a pile, a processor operatively connected to the linear electric machine and configured to determine a recoiled kinetic energy from striking the pile using a ram block connected to a mover of the linear electric machine, determining at least a portion of the determined recoiled kinetic energy for regenerative braking of the mover to a peak position, control the linear electric machine to decelerate the mover to the peak position based on the determined at least a portion of the determined recoiled kinetic energy.

There is provided a piling hammer comprising a linear electric machine comprising a mover connected to a ram block for striking a pile, a processor operatively connected to the linear electric machine and configured to determine a recoiled kinetic energy from striking the pile using a ram block connected to a mover of the linear electric machine, determining at least a portion of the determined recoiled kinetic energy for regenerative braking of the mover to a peak position, control the linear electric machine to decelerate the mover to the peak position based on the determined at least a portion of the determined recoiled kinetic energy.