Permanent magnet direct current motor apparatus
First Claim
1. A permanent magnet d.c. motor apparatus comprising:
- A. rotor means having a homogeneous core surrounding a longitudinal axis upon which is mounted an outer, segmented ring formed of a plurality of alternating polarized groups of magnets, such that any first group of magnets of a polarized group and other polarized groups of magnets has an end magnet juxtaposed to an end magnet of a second group of magnets of said polarized groups of magnets for providing a plurality of spatially distributed, localized magnetic flux about the outer circumference of said outer segmented ring;
B. stator means having a plurality of cylindrically spaced rows of electrically conductive coils which are radially disposed outside of said rotor means for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings;
C. timing means for providing a periodic timing pulse in response to rotation of said rotor, and;
D. electronic control means responsive to said periodic timing pulse for providing a sequential flow of current to said conductive coils, whereupon said current is directly proportional to a generation of said periodic timing pulses during one revolution of said rotor;
wherein said timing means is mounted for rotation with said rotor comprising;
a circular disk with a plurality of radially disposed electrical contacts mounted thereon;
a plurality of fixed contacts which contact said radially disposed electrical contacts as the disk rotates;
a d.c. electrical potential connected to said radially disposed electrical contacts;
a timing pulse conductor between said radially disposed electrical contacts and said electronic control means, said conductor providing an electrical path to communicate periodic timing pulses.
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Accused Products
Abstract
Disclosed is a permanent magnetic direct current motor apparatus which provides high constant torque and constant speed through a large stepping angle under varying output shaft load conditions. The apparatus includes a rotor, a plurality of stators and an electronic control device for providing a constant torque and speed. The rotor is constructed of a cylindrical homogeneous core having an outer, segmented ring formed from a plurality of permanent magnets. The magnets are of alternating polarity and are divided into groups. There is a stator apparatus surrounding the rotor which is composed of cylindrically spaced rows of electrically conductive coils radially spaced apart. A timing disk concentric with and rotating with the rotor senses the speed of the rotor and feeds back periodic timing pulses to an electronic switching system to control the current through the stators. The stators are electromagnetically coupled to the permanent magnet rotor surface. The current through the stators thereby control the magnitude of the electromagnetic flux and causes the rotor to maintain a constant speed as output shaft loads vary.
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Citations
7 Claims
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1. A permanent magnet d.c. motor apparatus comprising:
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A. rotor means having a homogeneous core surrounding a longitudinal axis upon which is mounted an outer, segmented ring formed of a plurality of alternating polarized groups of magnets, such that any first group of magnets of a polarized group and other polarized groups of magnets has an end magnet juxtaposed to an end magnet of a second group of magnets of said polarized groups of magnets for providing a plurality of spatially distributed, localized magnetic flux about the outer circumference of said outer segmented ring; B. stator means having a plurality of cylindrically spaced rows of electrically conductive coils which are radially disposed outside of said rotor means for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings; C. timing means for providing a periodic timing pulse in response to rotation of said rotor, and; D. electronic control means responsive to said periodic timing pulse for providing a sequential flow of current to said conductive coils, whereupon said current is directly proportional to a generation of said periodic timing pulses during one revolution of said rotor; wherein said timing means is mounted for rotation with said rotor comprising; a circular disk with a plurality of radially disposed electrical contacts mounted thereon; a plurality of fixed contacts which contact said radially disposed electrical contacts as the disk rotates; a d.c. electrical potential connected to said radially disposed electrical contacts; a timing pulse conductor between said radially disposed electrical contacts and said electronic control means, said conductor providing an electrical path to communicate periodic timing pulses. - View Dependent Claims (2, 3, 4)
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5. A permanent magnet d.c. motor apparatus comprising;
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A. rotor means having a homogeneous core surrounding a longitudinal axis upon which is mounted an outer, segmented ring formed of a plurality of alternating polarized groups of magnets, such that any first group of magnets of a polarized group and other polarized groups of magnets has an end magnet juxtaposed to an end magnet of a second group of magnets of said polarized groups of magnets for providing a plurality of spatially distributed, localized magnetic flux about the outer circumference of said outer segmented ring; B. stator means having a plurality of cylindrically spaced rows of electrically conductive coils which are radially disposed outside of said rotor means for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings; C. timing means for providing a periodic timing pulse in response to rotation of said rotor, and; D. electronic control means responsive to said periodic timing pulse for providing a sequential flow of current to said conductive coils, whereupon said current is directly proportional to a generation of said periodic timing pulses during one revolution of said rotor; wherein said electronic control means comprises; two switching module means for sequentially conducting direct current to said conductive coils in response to said periodic timing pulses; means for connecting said switching module means to a plurality of said conductive coils. - View Dependent Claims (6)
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7. A permanent magnet d.c. motor apparatus comprising:
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A. rotor means having a homogeneous core surrounding a longitudinal axis upon which is mounted an outer, segmented ring formed of a plurality of alternating polarized groups of magnets, such that any first group of magnets of a polarized group and other polarized groups of magnets has an end magnet juxtaposed to an end magnet of a second group of magnets of said polarized groups of magnets for providing a plurality of spatially distributed, localized magnetic flux about the outer circumference of said outer segmented ring; B. stator means having a plurality of cylindrically spaced rows of electrically conductive coils which are radially disposed outside of said rotor means for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings; C. timing means for providing a periodic timing pulse in response to rotation of said rotor, and; D. electronic control means responsive to said periodic timing pulse for providing a sequential flow of current to said conductive coils, whereupon said current is directly proportional to a generation of said periodic timing pulses during one revolution of said rotor;
wherein said stator means is comprised of cylindrically spaced elongate conductive coils which are radially disposed outside of said rotor for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings;wherein said stator means is comprised of cylindrically spaced elongate conductive coils which are radially disposed outside of said rotor for electromagnetic coupling to said spatially distributed, localized magnetic flux about said rotor circumference of said outer segmented rings.
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Specification