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A ten pole/twelve slot brushless DC motor for a disk drive spindle includes a base; a cylindrical rotor structure rotating relative to the base and a generally symmetrically slotted stator structure fixed about an axis of rotation. The rotor structure includes a permanent magnet ring structure defin

A ten pole/twelve slot brushless DC motor for a disk drive spindle includes a base; a cylindrical rotor structure rotating relative to the base and a generally symmetrically slotted stator structure fixed about an axis of rotation. The rotor structure includes a permanent magnet ring structure defining ten permanently magnetized alternating north-south magnet segments. The stator structure includes a ferromagnetic core defining twelve stator slots between twelve stator poles. Coils of insulated wire are wound around the stator poles in one of a plurality of disclosed winding patterns and connected into a series of phases, e.g. three phases.

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A brushless DC motor comprising: a base, a cylindrical rotor structure rotating relative to the base about an axis of rotation and including a rotating body journaled to the base by a bearing system and a permanent magnet ring structure carried by the rotating body and defining ten permanently magne

A brushless DC motor comprising: a base, a cylindrical rotor structure rotating relative to the base about an axis of rotation and including a rotating body journaled to the base by a bearing system and a permanent magnet ring structure carried by the rotating body and defining ten permanently magnetized alternating north-south magnet segments, a generally cylindrical stator structure including a core of ferromagnetic material secured to the base about the axis of rotation and separated inwardly of the permanent magnet ring structure by a magnetic clearance gap, the core defining twelve stator slots between twelve stator poles, a coil of insulated wire being wound around each stator pole in a predetermined winding direction, and the coils being connected into a series of three electrical driving phases, each phase including four predetermined stator coils connected in series, wherein the coils are wound and connected in accordance with one of the following connection patterns: (i) A′, A, B, B′, C′, C, A, A′, B′, B, C, C′; (ii) A, B, B′, B, C, A, A′, A, B, C, C′, C; (iii) A, B, C, A, C, A, B, C, B, C, A, B; or (iv) A, C′, C, A, C, B′, B, C, B, A′, A, B, where A represents a first phase, B represents a second phase and C represents a third phase, and wherein a prime character following a letter denotes a coil winding direction in opposite sense to a coil denoted by an unprimed letter.