Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-09-23
2001-05-29
Mullins, Burton (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S254100, C310S216006, C310S261100, C310S06800R
Reexamination Certificate
active
06239532
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates generally to electric motors and more specifically to a motor with an external rotor and a method for assembling the motor.
An motor with an external rotor or an “inside out motor”, of the type to which the present invention generally relates has permanent magnets mounted on an inner surface of a cup-shaped rotor bell. The stator is located inside the permanent magnets on the rotor bell. The stator is shaped to receive a bearing for rotatably mounting a rotor shaft through the stator so that the shaft and rotor bell may rotate relative to the stator as a result of the magnetic interaction of the permanent magnets and the magnetic fields created by energizing windings of the stator. Presently, these motors are electronically commutated and have a sensor for detecting the position of the magnetic poles of the rotor to control the commutation of the motor.
Typically, only one or two windings are wound on a bobbin of an inside out motor. Metal is provided around the bobbin, between the permanent magnets and the windings, to conduct the magnetic flux generated by the energized windings. Opposite ends of a plate are bent down so that the bent down ends may extend across the windings on diametrically opposite sides of the bobbin. The plate also has a central opening and a ring extending from the opening which is received into a central opening of the bobbin. Two substantially identical plates are mounted on axially opposite ends of the bobbin, and are angularly offset so that their bent down ends extend over different parts of the windings.
SUMMARY OF THE INVENTION
Among the several objects and features of the present invention may be noted the provision of an inside out motor which is easy and cost-efficient to manufacture and the provision of such a motor which is of simplified construction.
Generally, an inside out motor of the present invention comprises a rotor including a concave member, a shaft defining a longitudinal axis mounted on the concave member and a magnet mounted on an interior surface of the concave member. The magnet is spaced from the shaft and extends circumferentially on the concave member around the longitudinal axis of the shaft. A bearing receives the shaft for rotatably mounting the rotor. A stator assembly is mounted on said bearing and includes a bobbin mounted generally coaxially with the rotor shaft and having an interior diameter, an exterior diameter, a first axial end and a second axial end. A winding is wound on the bobbin and extends around the axis of the rotor shaft. The winding has a width in a direction parallel to the lengthwise extension of the rotor shaft. Plural separate ferromagnetic members are on each of the first and second axial ends of the bobbin. Each ferromagnetic member has a radially outer leg extending generally between the winding and the magnet. The outer legs of the ferromagnetic members on the first axial end of the bobbin extend generally from the first axial end of the bobbin toward the second axial end and the outer legs of the ferromagnetic members on the second axial end of the bobbin extend generally from the second axial end toward the first axial end. The ferromagnetic members on each of the first and second axial ends are disposed in angularly spaced, non-overlying positions around the longitudinal axis with respect to the other ferromagnetic members on the same axial end.
In another aspect of the invention, the inside out motor comprises a rotor including a concave member, a shaft defining a longitudinal axis mounted on the concave member and a magnet mounted on an interior surface of the concave member. The magnet is spaced from the shaft and extends circumferentially on the concave member around the longitudinal axis of the shaft. A bearing receives the shaft for rotatably mounting the rotor. A stator assembly is mounted on the bearing. The stator assembly includes a bobbin mounted generally coaxially with the rotor shaft and having an interior diameter, an exterior diameter, a first axial end and a second axial end. A winding is wound on the bobbin and extends around the axis of the rotor shaft. The winding has a width in a direction parallel to the lengthwise extension of the rotor shaft. At least three ferromagnetic members are on each of the first and second axial ends of the bobbin. The ferromagnetic members have radially outer legs extending generally between the winding and the magnet. The ferromagnetic members are angularly spaced around the longitudinal axis.
Other objects and features of the invention will be in part apparent and in part pointed out hereinafter.
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Bobay Dennis P.
Erdman David M.
Grimm James E.
Harms Harold B.
Hollenbeck Robert K.
General Electric Company
Mullins Burton
Senniger Powers Leavitt & Roedel
Wasserbauer Damian
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