ブラシレスモータ

US7737598
"DETAILED DESCRIPTION

Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following figures. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting（＊非限定）. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms “mounted,” “connected,” “supported,” and “coupled” and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Further, “connected” and “coupled” are not restricted to physical or mechanical connections or couplings.

As shown in the FIG. 1 a motor 10 generally includes a rotor 15 disposed within a stator 20. The rotor 15 is mounted on（＊取付、取り付け）a shaft 30 that extends axially to provide support points and to provide a convenient shaft power take off（＊取出し）point. Generally, two or more bearings 35 engage（＊係合）the rotor shaft 30 and support the rotor 15 such that it rotates about a rotational axis 40. The stator 20 is generally fitted into（＊嵌入、内に配設）a housing 45. The stator 20 defines a substantially cylindrical aperture, or bore 55 as it is commonly referred to in the motor art, that is centered on（＊心合わせ、心出し）the rotational axis 40. When the rotor 15 is in its operating position relative to the stator 20 a small air gap is established（＊形成）between the rotor and the stator. The air gap allows for relatively free rotation of the rotor 15 within the stator 20.

The frame 45, if employed, supports the stator 20. One frame 45, better illustrated in FIG. 11, includes a plurality of empty spaces 46 near the corners. The empty spaces 46 provide cooling passages for cooling air or another cooling fluid. In preferred constructions, the frame 45 includes a plastic material that is injection molded or otherwise formed. In other constructions, an extruded aluminum frame is employed. In still other constructions, other materials and other manufacturing methods may be employed to manufacture the frame 45.

The motor 10 illustrated in FIG. 1 is a brushless permanent magnet (PM) motor. As such, the rotor 15 includes a ferromagnetic core and permanent magnets that define two or more magnetic poles. The stator 20 includes one or more phase windings (shown in FIGS. 2-3) that can be selectively energized（＊通電）to produce a magnetic field. The permanent magnets of the rotor 15 interact with the magnetic field of the stator 20 to produce electromagnetic torque and rotor rotation. As one of ordinary skill will realize, the invention is also suited for other types of motors, in addition to the brushless permanent magnet motors illustrated herein. As such, the invention should not be limited to only these types of motors. Furthermore, one of ordinary skill in the art will realize that the invention can also be applied to many types of generators. The figures depict a motor 10 configuration having the rotor 15 placed interior to（＊内側、内部）the stator 20. However, the invention is also applicable to motor configurations, typically referred to as “inside-out motors,” where the rotor is exterior to（＊外側、外部）the stator. In addition, the figures and description presented herein are directed to a stator 20and/or a motor 10. However, many of the features described and illustrated could be applied to wound rotors. Thus, while the figures and description refer to a brushless motor 10 and/or a stator 20, other applications are possible."