High speed DC motor
First Claim
1. A DC motor comprising:
- a. a stator having a central rotor cavity and containing a stator set of electromagnets facing inward in a circumferential path about the rotor cavity;
b. a rotor rotatably mounted in the central rotor cavity, the rotor having a rotor set of magnets, each magnet of the rotor set of magnets having at least one pole facing outward in a circumferential path about the periphery of the rotor and aligned with the electromagnets of the stator sets of electromagnet;
c. a source of current to each electromagnet of the stator set of electromagnets;
d. rotor position sensing means for each electromagnet of the stator set of electromagnets for sensing the position of points on the rotor with regard to corresponding points on the stator; and
e. switching means between the source of current and each electromagnet of the stator set of electromagnets and operably connected to a corresponding rotor position sensing means for alternatively controlling current to selected electromagnets, the switching means energizing the electromagnets to be of a pole to attract the pole of the magnets of the rotor set of magnet when the magnets of the rotor set of magnets approach the electromagnet and energizing the electromagnets to be of a pole to repel the pole of the magnets of the rotor set of magnets when the magnets of the rotor set of magnets recedes from the electromagnets as the rotor rotates.
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Accused Products
Abstract
The stator electromagnets (80'"'"', 82'"'"', 84'"'"', 86'"'"', 88'"'"', 90'"'"') face inward about the rotor cavity (12) of the motor. Spaced horseshoe magnets (70) with spaced apart, opposite poles face outward about the periphery (22) of the rotor (20). The stator electromagnets are in two arrays. Each array is aligned with one pole of the rotor set of horseshoe magnets and has a pulling electromagnet (80'"'"' or 86'"'"') of a pole opposite to the pole of the rotor magnet. Each array also includes two pushing electromagnets (82'"'"', 84'"'"' or 88'"'"', 90'"'"') circumferentially offset from the pulling electromagnet, which are of a magnetic pole the same as the pole of the rotor magnet. Optical sensors (173, 175), which are axially aligned with the electromagnets, sense the position of rotor with regard to points on the stator. Switches on a circuit card associated with each array of electromagnets connect to the corresponding optical sensor for alternatively passing or blocking current to the electromagnets. The switches energize and de-energize the pulling and pushing electromagnet when the rotor magnet passes an adjacent, preceding, pulling electromagnets when the rotor magnet passes a predetermined position.
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Citations
27 Claims
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1. A DC motor comprising:
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a. a stator having a central rotor cavity and containing a stator set of electromagnets facing inward in a circumferential path about the rotor cavity; b. a rotor rotatably mounted in the central rotor cavity, the rotor having a rotor set of magnets, each magnet of the rotor set of magnets having at least one pole facing outward in a circumferential path about the periphery of the rotor and aligned with the electromagnets of the stator sets of electromagnet; c. a source of current to each electromagnet of the stator set of electromagnets; d. rotor position sensing means for each electromagnet of the stator set of electromagnets for sensing the position of points on the rotor with regard to corresponding points on the stator; and e. switching means between the source of current and each electromagnet of the stator set of electromagnets and operably connected to a corresponding rotor position sensing means for alternatively controlling current to selected electromagnets, the switching means energizing the electromagnets to be of a pole to attract the pole of the magnets of the rotor set of magnet when the magnets of the rotor set of magnets approach the electromagnet and energizing the electromagnets to be of a pole to repel the pole of the magnets of the rotor set of magnets when the magnets of the rotor set of magnets recedes from the electromagnets as the rotor rotates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A DC motor comprising:
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a. a stator having a central rotor cavity and containing a stator set of electromagnets facing inward about the rotor cavity; b. a rotor rotatably mounted in the central rotor cavity, the rotor having a rotor set of magnets having spaced apart, opposite poles facing outward about the periphery of the rotor; c. electromagnets of the stator set of electromagnets being in two arrays, each array aligned with one pole of the a magnet of the rotor set of magnets, each array comprising a first electromagnet positioned so that the one pole of the rotor set of magnets passes over the first electromagnet, each array further comprising two adjacent, axially aligned second electromagnets circumferetially offset from the first electromagnet and of a pole when energized the opposite as the pole of the first electromagnet; d. a source of current to each electromagnet of the stator set of electromagnets; e. rotor position sensing means for each array of stator electromagnets, at least one rotor position sensing means being axially aligned with the first electromagnet and at least another rotor position sensing means being axially aligned with the second electromagnets for sensing the position of points on the rotor with regard to corresponding points on the stator; and f. switching means between the source of current and each electromagnet of the stator set of electromagnets and operably connected to a corresponding rotor position sensing means for alternatively passing or blocking current to selected electromagnets. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A DC motor comprising:
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a. a stator containing a stator set of electromagnets in a path along the stator; b. a moving member mounted adjacent the stator, the moving member having a second set of magnets, each magnet of the second set of magnets having at least one pole facing toward and aligned with the stator set of electromagnets; c. a source of current to each electromagnet of the stator set of electromagnets; d. position sensing means for each electromagnet of the stator set of electromagnets for sensing the position of points on the moving member with respect to corresponding points on the stator; and e. switching means between the source of current and each electromagnet of the stator set of electromagnets and operably connected to a corresponding position sensing means for alternatively controlling current to selected electromagnets, the switching means energizing the electromagnets to be of a pole to attract the pole of the second set of magnets when the second magnet approaches the electromagnet and energizing the electromagnets to be of a pole to repel the pole of the second set of magnets when the second magnet recedes from the electromagnets.
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Specification