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US 6,856,054 B2Granted
Brushless DC motor, pump, and electronic apparatus
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsYoichi Shukuri, Kyo Niwatsukino, Yoshimitsu Aizono
Life of this patent
Estimating the term…
Abstract
A brushless DC motor includes a substrate fixed to the center of a stator core. The substrate includes a central substrate portion and an arm substrate portion extending from the central substrate to a salient pole. The arm substrate is accommodated between coils. A driver IC is mounted on the central substrate portion, and a magnetic pole position sensor is mounted on the arm substrate portion. This structure provides a thin brushless DC motor which assures good motor performance and stable noise and vibration levels, improves motor efficiency, and reduces the number of components and assembling steps.
Claims43
A motor comprising:
- an armature including:
- a stator core having a plurality of teeth and a plurality of salient poles disposed at respective tips of said plurality of teeth;
- and
- a plurality of coils wound around said plurality of teeth, respectively;
- a magnet rotor facing said plurality of salient poles;
- a sensor for detecting a magnetic pole position of said magnet rotor;
- a driver for controlling respective currents flowing through said plurality of coils according to a signal output by said sensor;
- and
- a substrate including:
- a central substrate portion disposed at a center of said stator core, said driver being mounted on said central substrate portion;
- and
- an arm substrate portion extending from said central substrate portion to said salient pole, said arm substrate portion being accommodated between two of said plurality of coils, said sensor being mounted on said arm substrate portion
- wherein said stator core has a surface perpendicular to an axis of rotation of said magnet rotor, said substrate being mounted on said surface of said stator core.
10 more elements
A motor comprising:
- a stator core including a plurality of teeth and a plurality of salient poles disposed at respective tips of said plurality of teeth;
- a plurality of coils wound around said plurality of teeth, respectively;
- a magnet rotor facing said plurality of salient poles;
- and
- a sensor disposed in a space surrounded by said plurality of coils and said plurality of salient poles, said sensor being mounted on said stator core and being operable to detect a magnetic pole position of said magnet rotor,
- wherein a distance between two of said plurality of teeth between which said sensor is disposed is longer than a distance between a remainder of said plurality of teeth other than said two of said plurality of teeth.
3 more elements
A motor comprising:
- a stator core including a plurality of teeth and a plurality of salient poles provided at respective tips of said plurality of teeth;
- a plurality of coils wound around said plurality of teeth, respectively;
- a magnet rotor facing said plurality of salient poles;
- a protrusion provided at said stator core between two of said plurality of teeth;
- and
- a sensor mounted to said protrusion, for detecting a magnetic pole position of said magnet rotor.
3 more elements
A motor comprising:
- an armature including:
- a stator core having a plurality of teeth and a plurality of salient poles disposed at respective tips of said plurality of teeth;
- and
- a plurality of coils wound around said plurality of teeth, respectively;
- a magnet rotor facing said plurality of salient poles;
- a sensor for detecting a magnetic pole position of said magnet rotor;
- a driver for controlling respective currents flowing through said plurality of coils according to a signal output by said sensor;
- and
- a substrate including:
- a central substrate portion disposed at a center of said stator core, said driver being mounted on said central substrate portion;
- and
- an arm substrate portion extending from said central substrate portion to said salient pole, said arm substrate portion being accommodated between two of said plurality of coils, said sensor being mounted on said arm substrate portion;
- wherein a pitch angle between two of said plurality of teeth adjacent to said arm substrate portion is wider than an equal pitch angle by a pitch angle (θ1 deg) for each of said two of said plurality of teeth;
- and
- wherein said pitch angle (θ1 deg) and a pitch angle (θ deg) between a remainder of said plurality of teeth other than said two of said plurality of teeth satisfy:
- θ=(360/n)−2θ1/(n−1)(deg),
- where n is the number of said plurality of teeth of said stator core.
14 more elements
A motor comprising:
- a stator core including a plurality of teeth and a plurality of salient poles disposed at respective tips of said plurality of teeth;
- a plurality of coils wound around said plurality of teeth, respectively;
- a magnet rotor facing said plurality of salient poles;
- and
- a sensor disposed in a space surrounded by said plurality of coils and said plurality of salient poles, said sensor being mounted on said stator core and being operable to detect a magnetic pole position of said magnet rotor,
- wherein a distance between two of said plurality of teeth between which said sensor is disposed is longer than a distance between a remainder of said plurality of teeth other than said two of said plurality of teeth;
- wherein a pitch angle between said two of said plurality of teeth is wider than an equal pitch angle by a pitch angle (θ1 deg) for each of said two of said plurality of teeth;
- and
- wherein said pitch angle (θ1 deg) and a pitch angle (θ deg) between a remainder of said plurality of teeth other than said two of said plurality of teeth satisfy:
- θ=(360/n)−2θ1/(n−1)(deg),
- where n is the number of said plurality of teeth of said stator core.
8 more elements
Dependencies are inferred from the claim text.