Electric Motor
First Claim
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1. A direct current (DC) motor apparatus, comprising:
- a stator having a plurality of magnets; and
a rotor having a plurality of armatures, wherein a quantity of the plurality of armatures is less than a quantity of the plurality of magnets, each of the armatures of the plurality of armatures experiencing a vector magnetic force in response to its proximity to respective adjacent magnets of the plurality of magnets, and each of the armatures having a planar sidewall opposing a planar sidewall of an adjacent armature;
wherein the vector sum of magnetic forces between each armature and its respective adjacent magnets of the plurality of magnets is zero at every angular rotation position of the rotor with respect to the stator in the motor'"'"'s non-energized state.
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Abstract
An asymmetric brushless direct current (DC) motor having a stator having a plurality of magnets and a rotor having a plurality of armatures where the vector sum of magnetic forces between each armature and each respective magnet is zero at every angular rotation position of the rotor with respect to the stator in the motor'"'"'s non-energized state.
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Citations
29 Claims
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1. A direct current (DC) motor apparatus, comprising:
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a stator having a plurality of magnets; and a rotor having a plurality of armatures, wherein a quantity of the plurality of armatures is less than a quantity of the plurality of magnets, each of the armatures of the plurality of armatures experiencing a vector magnetic force in response to its proximity to respective adjacent magnets of the plurality of magnets, and each of the armatures having a planar sidewall opposing a planar sidewall of an adjacent armature; wherein the vector sum of magnetic forces between each armature and its respective adjacent magnets of the plurality of magnets is zero at every angular rotation position of the rotor with respect to the stator in the motor'"'"'s non-energized state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A DC motor apparatus, comprising:
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a stator having a plurality of armatures, each of the armatures having a planar sidewall opposing a planar sidewall of an adjacent armature, and; a rotor having a plurality of magnets, each of the magnets of the plurality of magnets experiencing a vector magnetic force in response to its proximity to respective adjacent armatures of the plurality of armatures, wherein a quantity of the plurality of magnets is less than a quantity of the plurality of armatures; and wherein the vector sum of magnetic forces between each magnet and its respective adjacent armatures of the plurality of armatures is zero at every angular rotation position of rotor the with respect to the stator in the non-energized state of the motor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A method comprising:
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communicating a plurality of magnetic fields between a respective plurality of armatures on a rotor and respective pairs of magnets on a stator for each armature; and balancing the plurality of magnetic fields about the rotor as the rotor is rotated so that the vector sum of magnetic forces on the plurality of armatures is approximately zero as the rotor is rotated a complete revolution in its non-energized state; wherein the motor is substantially “
cogless”
as the rotor turns in its non-energized state.
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25. An unmanned aerial vehicle (UAV) sensor apparatus, comprising:
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a UAV; a brushless direct current (DC) motor coupled to the UAV, the DC motor further comprising; a stator having a plurality of magnets; and a rotor having a plurality of armatures, wherein a quantity of the plurality of armatures is less than a quantity of the plurality of magnets, each of the armatures of the plurality of armatures experiencing a vector magnetic force in response to its proximity to respective adjacent magnets of the plurality of magnets, and each of the armatures having a planar sidewall opposing a planar sidewall of an adjacent armature; wherein the vector sum of magnetic forces between each armature and its respective adjacent magnets of the plurality of magnets is zero at every angular rotation position of the rotor with respect to the stator in the motor'"'"'s non-energized state; and a sensor coupled to the motor in a direct-drive configuration; wherein the sensor is driven directly by the motor so that an angular rotation of the rotatable shaft, Δ
φ
, results in the same angular rotation Δ
φ
of the sensor. - View Dependent Claims (26, 27)
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28. An unmanned aerial vehicle (UAV) sensor apparatus, comprising:
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a UAV; a direct-drive motor coupled to the UAV; and a sensor coupled to the direct-drive motor, the direct-drive motor configured to angularly drive the sensor. - View Dependent Claims (29)
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Specification