Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
1999-05-19
2001-05-15
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S081000
Reexamination Certificate
active
06232685
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to electrically driven motors. In particular, the present invention relates to a nutational motor which has few parts and which is compact, easy to manufacture and inexpensive.
BACKGROUND OF THE INVENTION
Nutational motors are commonly used in applications, such as the operation of large fluid control valves, where the motors must provide high torque at low operating speeds. Nutational motors, such as those set forth in U.S. Pat. Nos. 5,237,234 and 5,672,923, typically include a rotor, a stator having a multiple magnetic lands encircling the rotor, a position sensor sensing the location of the rotor and an electrical sequencer for sequentially producing electromagnetic forces in the lands of the stator to sequentially attract and repel the rotor such that the rotor rotates against the magnetic lands about an axis.
Despite their electrical efficiency, such conventional nutational or electrostatic motors have been used in only a limited number of applications. This is largely due to the fact that the position sensor and the electrical sequencer are both relatively expensive electrical components which occupy space and which add cost to the manufactured motor. The multiple magnetic lands also increase the cost of such motors. As a result, the application of such electrostatic or nutational motors to small consumer products and one-time use products has been impractical.
Thus, there is a continuing need for a nutational or electrostatic motor which has fewer parts, which is compact and which can be easily manufactured at a lower cost.
SUMMARY OF THE INVENTION
The present invention provides a motor for use with an alternating current electrical outlet. The motor includes a retaining member, a rotor and a nutational actuator for nutating the rotor. The retaining member has a circumferential surface extending about an axis. The rotor is located adjacent to the retaining member stator and includes a magnet. The nutational actuator includes at least one ferromagnetic member proximate the rotor, an electrically conductive coil about the at least one ferromagnetic member and a plug having first and second prongs electrically connected to first and second ends of the coil. When the prongs are inserted into the electrical outlet, the alternating current flowing through the coil causes the rotor to nutate about the axis defined by the retaining member.
The present invention provides a motor for use with a source of an alternating electrical current. The motor includes a retaining member, a rotor, a magnetic member and an electrically conductive coil about the magnetic member. The retaining member has at least one circumferential surface extending about an axis. The rotor extends adjacent to the retaining member and has a center of mass and a magnet. The coil has first and second opposite ends adapted to be electrically connected to the source of alternating electrical current. The rotor gyrates about the center of mass in response to alternating electrical current flowing through the coil.
The present invention provides a motor for use with a source of alternating electrical current. The motor includes a retaining member, a rotor, a magnetic member proximate the rotor and an electrically conductive coil about the magnetic member. The retaining member is formed from a non-magnetic material and has at least one circumferential surface extending about an axis. The rotor has a magnet. The coil has first and second opposite ends adapted to be electrically connected to the source of alternating electrical current.
The present invention provides a motor for use with a source of an alternating electrical current. The motor includes a retaining member having first and second circumferential surface portions located about an axis, a rotor adjacent to the retaining member and having a magnet, a magnetic member proximate the rotor and an electrically conductive coil about the magnetic member. The coil has first and second opposite ends adapted to be electrically connected to the source of alternating electrical current. The first and second circumferential surface portions extend on opposite sides of the axis. The rotor is alternately attracted towards and repelled away from each of the first and second circumferential surface portions in response to alternating electrical current flowing through the coil.
The present invention also provides a method for rotatably driving a rotor having an axial length, an axial mid-point and first and second rotor portions on opposite axial sides of the axial mid-point. The method includes steps of providing a retaining member having first and second circumferential surface portions located about an axis, wherein the first and second circumferential surface portions extend on opposite sides of the axis; positioning the rotor between the first and second circumferential surface portions; and pivoting the rotor about an axis perpendicular to the axis of the retaining member, such that the rotor rotates against the first and second circumferential surface portions about the axis of the retaining member.
The present invention also provides a method for making a motor. The method includes the steps of providing a magnetic member having an axial end, wrapping an electrically conductive coil about the magnetic member, wherein the magnetic member has first and second opposite ends adapted for being connected to a source of an alternating electrical current, molding a mass of non-magnetic material about the magnetic member and the electrically conductive coil to form a body, forming a retaining member having an axis within the body proximate the axial end of the magnetic member and positioning a rotor along the axis of the retaining member.
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Rathe Todd A.
Swetish Thomas R.
Foley & Lardner
Johnson Outdoors Inc.
Perez Guillermo
Ramirez Nestor
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