Apparatus for Reducing Noise of Gear Pump Through Uneven Pitch-Simulated Control and Method Thereof

A method for reducing noise of a gear pump through an uneven pitch-simulated control, the method comprising:

• calculating different control current values for each tooth of a teeth order by applying a teeth number, the teeth order, and a teeth angle of the gear pump in which a plurality of teeth are evenly formed to a predetermined function;
• mapping and storing the teeth order and the control current value corresponding to the teeth order for each tooth;
• and
• variably generating the control current value mapped with the teeth order when the tooth sequentially reaches a reference position, wherein the control current value is added to a reference current value of a motor control signal and applied to a motor.

An apparatus comprising:

• a gear pump that includes a gear with a plurality of teeth that are evenly formed;
• a motor coupled to drive the gear pump;
• a processor configured to calculate different control current values for a predetermined function, the control current values being calculated for each tooth by applying a teeth number, a teeth order, and a teeth angle;
• a memory configured to map and store the teeth order and the different control current values corresponding to the teeth order for each tooth;
• a current generator configured to variably generate the control current value mapped corresponding to the teeth order when each tooth reaches a reference position when the gear pump rotates by the motor;
• and
• a current adder having inputs coupled to receive the generated control current value and a reference and an output coupled to the motor.