Fluid-rotating apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoshihiro Ikemoto, Teruo Maruyama
Life of this patent
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Abstract
A fluid-rotating apparatus comprises a positive displacement pump structure section for rotating the rotary shaft of each of a plurality of rotors synchronously. In controlling the synchronous rotation of the rotary shafts by a PLL control method, a gain-switching means device is provided to set a high gain in a PLL control circuit when the rotary shafts are accelerating or decelerating and setting a low gain therein when the rotary shafts are rotating in a steady state.
Claims6
A fluid-rotating apparatus comprising, a plurality of rotors accommodated in a housing;
- first and second rotary shafts installed on the rotors, respectively;
- a plurality of motors, each for driving one of the rotary shafts independently;
- a rotation-detecting means for detecting one of a rotational angle of each motor and a number of rotations thereof;
- a suction opening and a discharge opening forming in the housing;
- and a positive displacement pump structure section formed by the housing and the rotors;
- characterized in that the first rotary shaft functions as a driving side rotary shaft;
- the second rotary shaft functions as a driven side rotary shaft;
- and a rotation controlling means is provided for controlling rotation of the second rotary shaft based on information detected by the rotation-detecting means provided on the first rotary shaft, to thereby synchronously rotate the first rotary shaft and the second rotary shaft;
- wherein a PLL control circuit is provided for rotating the driven side rotary shaft synchronously with the driving side rotary shaft under PLL control operation;
- and
- wherein a gain-switching means is provided for setting a high gain in the PLL control circuit when the driving side rotary shaft is accelerating or decelerating, and setting a low gain therein when the driving side rotary shaft is rotating in a steady state.
A fluid-rotating apparatus comprising:
- a plurality of rotors accommodated in a housing;
- first and second rotary shafts installed on the rotors, respectively;
- a plurality of motors, each for driving one of the rotary shafts independently;
- a rotation-detecting means for detecting one of a rotational angle of each motor and a number of rotations thereof;
- a suction opening and a discharge opening formed in the housing;
- and a positive displacement pump structure section for sucking and discharging fluid by utilizing volume change in a space formed between the rotors and the housing, as a result of synchronous drive of the motors controlled by signals detected by the rotation-detecting means,
- characterized by further comprising:
- a PLL control circuit for rotating the driven side rotary shaft synchronously with the driving side rotary shaft under PLL control operation;
- and
- a gain-switching means for setting a high gain in the PLL control circuit when the driving side rotary shaft is accelerating or decelerating, and setting a low gain therein when the driving side rotary shaft is rotating in a steady state.
Dependencies are inferred from the claim text.