| 摘要 |
An electrically operated pump assembly operable on a variable frequency power source includes a pump having an input shaft, and a variable frequency motor operatively coupled to the input shaft. The variable frequency motor includes a first winding having a first number of poles, and a second winding having a second number of poles, wherein the first winding is selectively energizable in a first frequency range of the predetermined frequency range, and the second winding is selectively energizable in a second frequency range of the predetermined frequency range.
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