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1. WO2021038541 - VIBRATION MOTOR

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[ EN ]

WHAT IS CLAIMED IS:

1. A vibration motor, comprising:

a shell defining a cavity therein;

an axis disposed entirely within said cavity and fixedly anchored to said shell; a first magnet, disposed about said axis within said cavity and being rotationally movable relative to said shell, said first magnet including at least two sections having alternating poles;

a second magnet, disposed about said axis within said cavity, said second magnet including at least two sections having alternating poles;

a first extension tab, fixedly attached to said first magnet and extending out of said shell via a slot in said shell;

an unbalanced rotor, disposed on said axis between said first and said second magnets and being rotatable relative to said axis, said unbalanced rotor having a commutating electronic circuit disposed on a first surface thereof and electric coils disposed on a second surface thereof, opposed to said first surface, said electric coils adapted to receive current from said commutating electronic circuit;

an electric terminal disposed about said axis within said cavity, said electric terminal including an electric circuit terminating in an electric lead extending out of said shell, and a plurality of brushes extending from said electrical terminal toward said unbalanced rotor and electrically engaging said commutating electronic circuit of said rotor, said plurality of brushes adapted to provide electric current, received via said electric lead, to said commutating electronic circuit,

wherein said first extension tab is movable within said slot, such that moving said tab causes rotation of said first magnet about said axis and changes a rotational position of said first magnet relative to said second magnet, thereby to change the efficiency of operation of said motor, and

wherein, in operation, DC current provided via said electric terminal and said brushes to said commutating electronic circuit causes polarizing of said coils, and attraction and repulsion of said polarized coils by said first and second magnets drives rotation of said rotor about said axis.

2. The vibration motor of claim 1, wherein said second magnet is in a fixed rotational position relative to said shell.

3. The vibration motor of claim 1, wherein said first extension tab is adapted to move said first magnet between a lower motor efficiency orientation, in which a North pole of said first magnet at least partially overlaps a North pole of said second magnet, and a maximal motor efficiency orientation, in which there is no overlap of said North pole of said first magnet and said North pole of said second magnet.

4. The vibration motor of claim 3, wherein said first extension tab is adapted to move said first magnet between multiple lower motor efficiency orientations, wherein different ones of said multiple lower motor efficiency orientations have different degrees of overlap between said North pole of said second magnet and said North pole of said first magnet.

5. The vibration motor of any one of claims 1, 3 or 4, wherein said second magnet is rotationally movable relative to said shell and relative to said first magnet.

6. The vibration motor of claim 5, further comprising a second extension tab, fixedly attached to said second magnet and extending out of said shell via a second slot in said shell,

wherein said first and second extension tabs are movable within said first and second slots, such that moving at least one of said first and second tabs causes relative movement of at least one of said first and second magnets and changes a relative position of said first and second magnets, thereby to change the efficiency of operation of said motor.

7. The vibration motor of claim 6, wherein at least one of said first and second extension tabs is adapted to move at least one of said first and second magnets between a lower motor efficiency orientation, in which a North pole of said second magnet at least partially overlaps a North pole of said first magnet, and a maximal motor efficiency orientation, in which there is no overlap of said North pole of said second magnet and said North pole of said first magnet.

8. The vibration motor of claim 7, wherein at least one of said first and second extension tabs is adapted to move at least one of said first and second magnets between multiple lower motor efficiency orientations, wherein different ones of said multiple lower motor efficiency orientations have different degrees of overlap between said North pole of said second magnet and said North pole of said first magnet.

9. The vibration motor of claim 3 or claim 7, wherein in said maximal motor efficiency orientation, each North pole of said second magnets overlaps only a South pole of said first magnet, and each South pole of said second magnet overlaps only a North pole of said first magnet.

10. The vibration motor of any one of claims 1 to 9, wherein each of said first and second magnets includes four sections having alternating poles.

11. The vibration motor of any one of claims 1 to 10, wherein said at least two sections of each of said first and second magnets are equally sized.

12. The vibration motor of any one of claims 1 to 11, wherein said first and second magnets are rare earth magnets.

13. The vibration motor of any one of claims 1 to 12, wherein said shell has a diameter in the range of 5mm to 12mm and a height in the range of 2mm to 8mm.

14. The vibration motor of claim 13, wherein said diameter of said shell is greater than said height of said shell, and a ratio of said diameter of said shell to said height of said shell is in the range of 1.1 : 1 to 6: 1.

15. The vibration motor of any one of claims 1 to 14, wherein said first extension tab is movable within said slot and said first magnet is movable relative to said second magnet, only during a set-up mode of operation prior to activation of said vibration motor, and during an active mode of operation of said vibration motor, said first magnet is fixed relative to said second magnet.

16. A vibration motor, comprising:

a shell defining a cavity therein;

an axis disposed entirely within said cavity and being fixedly anchored to said shell;

first and second magnets, disposed about said axis in fixed orientations relative to said shell, each of said first and second magnets including at least two sections having alternating poles;

an unbalanced rotor, disposed on said axis between said first and said second magnets and being rotatable relative to said axis, said unbalanced rotor having a commutating electronic circuit disposed on a first surface thereof and electric coils disposed on a second surface thereof, opposed to said first surface, said electric coils adapted to receive current from said commutating electronic circuit;

an electric terminal disposed about said axis within said shell, said electric terminal including an electric circuit terminating in an electric lead extending out of said shell, and a plurality of brushes extending from said electrical terminal toward said unbalanced rotor and electrically engaging said commutating electronic circuit of said rotor, said plurality of brushes adapted to provide electric current, received via said electric lead, to said commutating electronic circuit,

wherein, in operation, DC current provided via said electric terminal and said brushes to said commutating electronic circuit causes polarizing of said coils, and attraction and repulsion of said polarized coils by said first and second magnets drives rotation of said rotor about said axis, and

wherein said first and second magnets are arranged within said shell such that at least one North pole of said first magnet at least partially overlaps at least one North pole of said second magnet, and said motor operates at less than maximal efficiency.

17. The vibration motor of claim 16, wherein each of said first and second magnets includes four sections having alternating poles, said four sections being equally sized.

18. The vibration motor of any one of claims 16 to 17, wherein said first and second magnets are rare earth magnets.

19. The vibration motor of any one of claims 16 to 18, wherein said shell has a diameter in the range of 5mm to 12mm and a height in the range of 2mm to 8mm.

20. The vibration motor of claim 19, wherein said diameter of said shell is greater than said height of said shell, and a ratio of said diameter of said shell to said height of said shell is in the range of 1.1 : 1 to 6: 1.

21. A vibration motor, comprising:

a shell defining a cavity therein;

an axis disposed entirely within said cavity and fixedly anchored to said shell; a first magnet, disposed about said axis within said cavity and being rotationally movable relative to said shell, said first magnet including at least two sections having alternating poles;

a second magnet, disposed about said axis within said cavity, said second magnet including at least two sections having alternating poles;

a first extension tab, fixedly attached to said first magnet and extending out of said shell via a slot in said shell;

an unbalanced rotor, disposed on said axis between said first and said second magnets and being rotatable relative to said axis, said unbalanced rotor having a commutating electronic circuit disposed on a first surface thereof and electric coils disposed on a second surface thereof, opposed to said first surface, said electric coils adapted to receive current from said commutating electronic circuit;

an electric terminal disposed about said axis within said cavity, said electric terminal including an electric circuit terminating in an electric lead extending out of said shell, and a plurality of brushes extending from said electrical terminal toward said unbalanced rotor and electrically engaging said commutating electronic circuit of said rotor, said plurality of brushes adapted to provide electric current, received via said electric lead, to said commutating electronic circuit,

wherein, in a set-up mode of operation prior to activation of said vibration motor, said first extension tab is movable within said slot, such that moving said tab causes rotation of said first magnet about said axis and changes a rotational position of said first magnet relative to said second magnet, thereby to change the efficiency of operation of said motor, and in an active mode of operation of said vibration motor, following activation thereof, said first extension tab is fixed within said slot and said first magnet is fixed relative to said second magnet,

wherein, in operation, DC current provided via said electric terminal and said brushes to said commutating electronic circuit causes polarizing of said coils, and attraction and repulsion of said polarized coils by said first and second magnets drives rotation of said rotor about said axis.