Flying device

1. A flying device, comprising:

a base;

a plurality of thrusters provided on the base each including a propeller, a motor which drives the propeller, and a pitch change mechanism unit which changes a pitch of the propeller;

an orientation detection unit that detects an orientation of the base;

an abnormality detection unit that detects an abnormality in at least one of the thrusters; and

an orientation control unit that, when the abnormality detection unit detects the abnormality, changes the pitches of the propellers in the remaining thrusters to maintain an orientation of the base detected by the orientation detection unit, wherein

the thrusters are provided on respective arm portions that extend radially from the base,

an abnormal thruster is defined as a thruster among the plurality of thrusters in which an abnormality has occurred, and

the orientation control unit is configured to change the pitch of the propeller of a symmetrical thruster provided at a position symmetrical to the abnormal thruster or substantially symmetrical to the abnormal thruster across the base.

2. The flying device according to claim 1 , wherein

the orientation control unit is configured to change the output of the motor of the symmetrical thruster in addition to the pitch of the propeller of the symmetrical thruster.

3. The flying device according to claim 2 , wherein

the orientation control unit is configured to control a thrust of the symmetrical thruster to be Nh/Nl times, Nh being the number of thrusters with their propeller rotating in an opposite direction to a rotation direction of the propeller in the abnormal thruster, and Nl being the number of thrusters with their propeller rotating in the same direction as the rotation direction of the propeller in the abnormal thruster.

4. The flying device according to claim 2 , wherein

the orientation control unit is configured to increase the output of the motor in the remaining thrusters aside from the abnormal thruster and the symmetrical thruster.

5. The flying device according to claim 1 , further comprising:

a rotation mechanism, wherein

the thrusters are provided on respective arm portions extending radially from the base,

the rotation mechanism is provided on the arm portions, the rotation mechanism being configured to rotate the thrusters with respect to the base about a virtual axis connecting the base and the thrusters, and

when an abnormal thruster is defined as a thruster among the plurality of thrusters in which an abnormality has occurred, the orientation control unit is configured to rotate a symmetrical thruster provided at a position symmetrical to or substantially symmetrical to the abnormal thruster across the base by the rotation mechanism.

6. The flying device according to claim 1 , wherein

the thrusters are provided on respective arm portions extending radially from the base, and

when an abnormal thruster is defined as a thruster among the plurality of thrusters in which an abnormality has occurred, the orientation control unit is configured to set the pitch of the propeller in a symmetrical thruster provided at a position symmetrical to or substantially symmetrical to the abnormal thruster across the base to be 0°, and is configured to control a thrust of the remaining thrusters aside from the abnormal thruster and the symmetrical thruster to compensate for the thrust generated by the abnormal thruster and the symmetrical thruster.

7. The flying device according to claim 1 , further comprising:

a plurality of display units provided in a circumferential direction of the base that visually display a traveling direction of the base when an abnormality is detected in any one of the thrusters.

8. A flying device, comprising:

a base;

a plurality of thrusters provided on the base each including a propeller, a motor which drives the propeller, and a pitch change mechanism unit which changes a pitch of the propeller;

a sensor fixed to the base configured to detect an orientation of the base; and

a processor coupled to the plurality of thrusters, the processor programmed to:

monitor an operation of the plurality of thrusters to detect an abnormality in at least one of the thrusters, and

upon detecting the abnormality, control the plurality of thrusters to change the pitches of the propellers in the remaining thrusters to maintain an orientation of the base detected by the sensor, wherein

the thrusters are provided on respective arm portions that extend radially from the base,

an abnormal thruster is defined as a thruster among the plurality of thrusters in which an abnormality has occurred, and

the processor is configured to change the pitch of the propeller of a symmetrical thruster provided at a position symmetrical to the abnormal thruster or substantially symmetrical to the abnormal thruster across the base.

9. The flying device according to claim 1 , wherein

the orientation control unit is configured to change the pitch of the propeller of the symmetrical thruster such that a propulsive force of the propeller of the symmetrical thruster in an ascending direction decreases when the flying device is ascending or hovering, and

the orientation control unit is configured to change the pitch of the propeller of the symmetrical thruster such that the propulsive force of the propeller of the symmetrical thruster in the ascending direction increases when the flying device is descending.

10. The flying device according to claim 8 , wherein

the processor is configured to change the pitch of the propeller of the symmetrical thruster such that a propulsive force of the propeller of the symmetrical thruster in an ascending direction decreases when the flying device is ascending or hovering, and

the processor is configured to change the pitch of the propeller of the symmetrical thruster such that the propulsive force of the propeller of the symmetrical thruster in the ascending direction increases when the flying device is descending.