Brushless motor
First Claim
1. A brushless motor comprising:
- a rotor;
a driving magnet which is rotated integrally with said rotor;
a stator core disposed so as to oppose said driving magnet and being wound therearound with a coil, said stator core having salient poles with umbrella portions except for notched portions thereof;
a magnetic sensor disposed in the vicinity of said stator core in a first notched portion prepared by partly removing two corresponding adjacent salient-pole umbrella portions of said stator core for detecting a magnetic pole of the driving magnet; and
a second notched portion being formed by partly removing two corresponding adjacent salient-pole umbrella portions in a zone of the whole circumferential area of said stator core, said second notched portion being magnetically balanced with said first notched portion.
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Accused Products
Abstract
A brushless motor comprises a rotor, a driving magnet which is rotated integrally with the rotor and a stator core disposed so as to oppose the driving magnet and being wound therearound with a coil. The stator core has salient poles with umbrella portions except for notched portions thereof. A magnetic sensor is disposed in the vicinity of the stator core in a first notched portion prepared by partly removing two corresponding adjacent salient-pole umbrella portions of the stator core for detecting a magnetic pole of the driving magnet. A second notched portion is formed by partly removing two corresponding adjacent salient-pole umbrella portions in a zone of the whole circumferential area of the stator core. The second notched portion is magnetically balanced with the first notched portion.
20 Citations
4 Claims
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1. A brushless motor comprising:
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a rotor; a driving magnet which is rotated integrally with said rotor; a stator core disposed so as to oppose said driving magnet and being wound therearound with a coil, said stator core having salient poles with umbrella portions except for notched portions thereof; a magnetic sensor disposed in the vicinity of said stator core in a first notched portion prepared by partly removing two corresponding adjacent salient-pole umbrella portions of said stator core for detecting a magnetic pole of the driving magnet; and a second notched portion being formed by partly removing two corresponding adjacent salient-pole umbrella portions in a zone of the whole circumferential area of said stator core, said second notched portion being magnetically balanced with said first notched portion. - View Dependent Claims (2, 3, 4)
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Specification