Brushless DC motor
First Claim
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1. A brushless DC motor comprising:
- a motor section provided with a rotor, a stator and a housing, said rotor having a first permanent magnet on an outer periphery, the first permanent magnet having a plurality of magnetic poles, said stator being disposed facing the outer periphery of the rotor and held by the housing, said stator having a plurality of coils and generating a rotational force to the rotor by applying current to the coils;
a position detection means for detecting a rotation position of the rotor; and
a control circuit section for controlling the application of current to the coils in accordance with the position of the rotor detected by the position detection means, said control circuit section being integrated with the motor section, wherein a partition is provided between the motor section and the control circuit section, a casing member is provided to isolate the control circuit section from an external environment, and wherein said position detection means is disposed outside of a bearing member with respect to an axial direction, said bearing member rotatably supporting the rotor.
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Abstract
A brushless DC motor includes: a motor section which has a rotor, a stator and a housing; a control circuit section which is integrated with the motor section and separated from the motor section by a partition; and a casing member which covers the control circuit section to isolate the control circuit section from the external environment. A position detection means is disposed outside of a bearing member with respect to an axial direction.
32 Citations
21 Claims
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1. A brushless DC motor comprising:
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a motor section provided with a rotor, a stator and a housing, said rotor having a first permanent magnet on an outer periphery, the first permanent magnet having a plurality of magnetic poles, said stator being disposed facing the outer periphery of the rotor and held by the housing, said stator having a plurality of coils and generating a rotational force to the rotor by applying current to the coils;
a position detection means for detecting a rotation position of the rotor; and
a control circuit section for controlling the application of current to the coils in accordance with the position of the rotor detected by the position detection means, said control circuit section being integrated with the motor section, wherein a partition is provided between the motor section and the control circuit section, a casing member is provided to isolate the control circuit section from an external environment, and wherein said position detection means is disposed outside of a bearing member with respect to an axial direction, said bearing member rotatably supporting the rotor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification