Quasi variable frequency motor controller

摘要

An apparatus for a quasi variable frequency motor controller is includes a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting. The first frequency includes a discrete frequency in a plurality of discrete frequencies of the DFC method and each discrete frequency includes a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor. The apparatus includes a torque module that determines when motor torque generated by the motor reaches a negative torque threshold and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold. The second frequency is a next frequency in the DFC method.

主权项

1. An apparatus comprising:
a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting, the first frequency comprising a discrete frequency in a plurality of discrete frequencies of the DFC method and wherein each discrete frequency comprises a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor; a torque module that determines, from data received from motor sensors, when motor torque generated by the motor reaches a negative torque threshold; and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold, the second frequency comprising a next frequency in the DFC method, wherein at least a portion of the DFC module, the torque module, and the next frequency module comprise one or more of hardware and executable code, the executable code stored on one or more non-transitory computer readable storage media.