Patent
Disk drive spindle motor with radial gap and field generating coils interconnected by ring flux guide
TLDR
A brushless permanent magnet DC motor for use as a disk drive spindle motor has a radial working gap but uses flat coils that generate magnetic fields that interact with the permanent magnet fields across the radial gap as mentioned in this paper.Abstract:
A brushless permanent magnet DC motor for use as a disk drive spindle motor has a radial working gap but uses flat coils that generate magnetic fields that interact with the permanent magnet fields across the radial gap. The stator includes a plurality of angularly spaced stator teeth that have faces radially spaced across the gap from the permanent magnet. The magnetic flux from the permanent magnet is directed radially across the gap and into the stator teeth. Each stator tooth has an axially oriented post around which is wound a flat coil that generates an axial field. The central axis of the coil forms part of the magnetic circuit. The magnetic flux directed radially into each stator tooth is turned axially into the post. The axially directed magnetic flux through the coil and post on each tooth is redirected from the axial direction to the circumferential direction by a ring magnetic flux guide. The ring flux guide interconnects the stator teeth and forms part of the magnetic circuit.read more
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Patent
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Patent
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Patent
Stator assembly made from a molded web of core segments and motor using same
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Patent
High speed spindle motor with hydrodynamic bearings
TL;DR: In this paper, a high speed spindle motor with a stator assembly including multiple conductors that create a plurality of magnetic fields when electrical current is conducted by the conductors and a body of a phase change material such as a thermoplastic substantially encapsulating the stator is presented.
References
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Patent
D.C. motor
TL;DR: In this paper, a P.M. d.c. motor is presented in which the permanent magnets are magnetized in a radial polar sense and interact in radial fashion with three core components of each pole assembly.
Patent
Portable low profile information storage system
TL;DR: In this article, a low profile information storage system including a portable low-profile information storage cartridge is described, where a transducer actuator is used to position the transducers at selected locations over the disk(s) and transducers are sealed in a clean controlled environment.
Patent
Spindle motor and disk drive having the same
TL;DR: In this paper, a spindle motor includes a permanent magnet multipolarized in a circular direction of the permanent magnet, which generates magnetic fluxes in a radial direction of spindle motors.
Patent
Spindle motor assembly for disc drives
TL;DR: In this paper, a spindle motor assembly was proposed that utilizes a fixed shaft and places the motor rotor components on the outside wall of the spindle hub directly below its disc stack supporting flange.
Patent
Disk drive apparatus
TL;DR: In this article, the authors present a disk drive that includes a magnetic disk, a spindle motor, a stator core around which an armature coil is wound, and a support arm for supporting the magnetic head.