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Sump pump drive system

  • US 5,234,319 A
  • Filed: 05/04/1992
  • Issued: 08/10/1993
  • Est. Priority Date: 05/04/1992
  • Status: Expired due to Fees
First Claim
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1. In a sump pump drive system operable in a normal mode when AC line power is available or emergency mode when AC line power has failed, the system being powered in the normal mode by a single phase AC source and having an AC-to-DC converter, a DC standby source, a sump pump and a pump drive motor, the improvement wherein:

  • the pump drive motor is a poly-phase AC machine;

    the system further comprises a polyphase DC-to-AC inverter connected to the drive motor;

    the system includes a battery charger connected between the converter and the inverter for periodically charging the DC standby source; and

    ,the pump drive motor is driven using inverted DC power in both normal and emergency modes.

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