Dishwasher

A dishwasher, comprising:

• a tub having a wash space that is configured to receive therein a wash target;
• a sump disposed at a lower end of the tub and configured to receive wash water;
• a wash pump configured to supply the wash water from the sump to a nozzle;
• a rack disposed in the wash space and configured to accommodate the wash target;
• the nozzle that (i) is disposed at a lower end of the rack, (ii) is configured to be rotated by a force of the wash water supplied from the wash pump, (iii) is configured to spray the wash water to the wash target, and (iv) has a magnetic object coupled to one end of the nozzle, wherein a first pole and a second pole of the magnetic object are oriented circumferentially with respect to a rotation axis of the nozzle;
• a sensing module comprising a Hall sensor that is configured to sense a magnetic force generated by a rotation of the magnetic object with the nozzle;
• and
• a controller configured to:
• receive sensing results from the sensing module,
• determine, based on the sensing results, one or more of a rotation direction of the nozzle, a rotation speed of the nozzle, or whether the nozzle is rotating,
• based on the determination, output an abnormality notification to a user or control wash water supplied to the nozzle through the wash pump,
• determine, based on (i) a magnetic force generated by the magnetic object being not sensed through the sensing module and (ii) then a magnetic force generated by the first pole of the magnetic object being first sensed, that the rotation direction of the nozzle is a first direction, and
• determine, based on (i) a magnetic force generated by the magnetic object being not sensed through the sensing module and (ii) then a magnetic force generated by the second pole of the magnetic object being first sensed, that the rotation direction of the nozzle is a second direction.