Fluid rotating apparatus with plural drive motor synchronization

Details Fluid rotating apparatus with plural drive motor synchronization Fluid rotating apparatus with plural drive motor synchronization

1993-03-18

1994-09-20

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

With plural separate drive motor controlling elements

417 42, 417 44J, 417 53, 417203, 4174234, 318 85, F04B 4900, H02P 546

Patent

active

053484487

ABSTRACT:
A fluid rotating apparatus includes non-circular rotors accommodated in a housing, rotary shafts having the rotors, bearings for rotatably supporting the shafts, a fluid suction and a fluid discharge ports formed in the housing, a positive displacement pump section formed of combination of the housing and rotors, and gears connected with the shafts having backlash set smaller than backlash between the rotors. The apparatus includes motors for independently driving the shafts, a device for detecting a rotating angle or speed of rotation of the motors, a unit for controlling the motors to synchronously rotate, a unit for detecting a current running in the motors, a unit for detecting a relative position of the shafts, and a rotation commanding unit, to which outputs from the motor current detecting unit and relative position detecting unit are inputted, for deciding whether or not a shift amount of the synchronous rotation is larger than a specified value based on the outputs of the motor current detecting unit and/or the relative position detecting unit, and outputting to the motor controlling unit a signal to decelerate one shaft when the rotation command unit decides that the shift amount of the synchronous rotation is larger than the value.

REFERENCES:
patent: 4617498 (1986-10-01), Ruppert
patent: 4808077 (1989-02-01), Kan et al.
patent: 5197861 (1993-03-01), Maruyama et al.

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