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AssigneeWeatherford Technology Holdings, LLC
InventorMohammed S. Arefeen
Estimating the term…
A variable-frequency drive includes a rectifier, a filter, an inverter, a capacitor bank, and control circuitry. The rectifier converts AC power from a power source to DC power on a DC bus for filtering by the filter. The inverter converts the DC power to three-phase AC power for output to the electric motor. The capacitor bank has one or more capacitors connected to the DC bus. The capacitor bank can store regenerative power on the DC bus from the inverter and can supply the stored DC power to the DC bus for conversion to the three-phase AC power to drive the electric motor. The control circuitry pre-charges the capacitor bank from the AC power of the power source. The control circuitry monitors one or more parameters of the variable-frequency drive and detects one or more fault conditions associated with the one or more monitored parameters.
A variable-frequency drive for use with an alternating current (AC) power source and an electric motor of a reciprocating load device, the variable-frequency drive comprising:
A method used with a variable-frequency drive, the variable-frequency drive connected to an alternating (AC) power source and configured to drive an electric motor, the method comprising:
Dependencies are inferred from the claim text.