Methods of torque estimation and compensation and systems thereof

摘要

At least one example embodiment discloses a method including measuring phase currents associated with one or more stator windings of the machine, estimating terminal voltage values based on the measured phase currents representations of the machine and based on at least one of a duty cycle and a dead time ratio of the machine, transforming the terminal voltage values to derive direct and quadrature voltage representations consistent with the measured phase currents, determining a terminal power of one or more terminals of the machine, the terminal power directly based on one of the estimated terminal voltage values and direct and quadrature voltage representations of the machine and current command values and determining an estimated shaft torque of the machine based on the terminal power in accordance with at least one efficiency value based on machine parameters from a characterization of the machine.

主权项

1. A method of estimating shaft torque of an alternating current machine, the method comprising:
determining phase current command values; estimating terminal voltage values based on actual phase current values and based on at least one of a duty cycle and a dead time ratio of the machine; transforming the terminal voltage values to derive direct and quadrature voltage representations consistent with the current command values; determining a terminal power of one or more terminals of the machine, the terminal power directly based on the direct and quadrature voltage representations of the machine and the current command values; determining an estimated shaft torque of the machine based on the terminal power in accordance with at least one efficiency value based on machine parameters from a characterization of the machine; and adjusting a torque command applied to the machine based on the estimated shaft torque.