Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-02-26
2001-04-03
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S112000, C318S035000
Reexamination Certificate
active
06211591
ABSTRACT:
TECHNICAL FIELD
The present invention relates to electromagnetic devices generally and, more particularly, but not by way of limitation, to a novel electromagnetic device which selectively provides rotary and/or linear motion at a single output shaft.
BACKGROUND ART
In certain applications, it is desirable to have a shaft which may selectively rotate and/or reciprocate. Such an application, for example, is in the robotic picking and placing of components where it may be required to axially move a component to an insertion position and then rotate the component to screw it in place. Conventional motor arrangements to accomplish such motion are often complicated and heavy, a substantial disadvantage for robotics applications. Another type of application requiring a shaft which may selectively rotate and/or reciprocate is in the precise control of laparoscopic and other such medical instruments.
In either type of application, it is frequently required that the linear motion be locked while rotary motion takes place. For a rotary/linear motor, this makes it desirable that the linear and rotary motions be controllable independently of one another.
Accordingly, it is a principal object of the present invention to provide an electromagnetic device which selectively provides both linear and/or rotary motion at a single output shaft.
It is an additional object of the invention to provide such an electromagnetic device in which linear and rotary motions are controllable independently of one another.
It is another object of the invention to provide such an electromagnetic device in which linear motion can be locked while rotary motion is provided.
It is a further object of the invention to provide such an electromagnetic device that is simple and economical to manufacture.
An additional object of the invention is to provide such an electromagnetic device that is lightweight and compact.
Other objects of the present invention, as well as particular features, elements, and advantages thereof, will be elucidated in, or be apparent from, the following description and the accompanying drawing figures.
DISCLOSURE OF INVENTION
The present invention achieves the above objects, among others, by providing, in a preferred embodiment, a linear/rotary electromagnetic device, comprising: a housing; first and second stators disposed in said housing; first and second rotors disposed in said housing and magnetically interacting, respectively, with said first and second stators; said first stator and said first rotor comprising a rotary motor; said second stator and said second rotor comprising an electromagnetic brake; a shaft extending through a portion of said housing and axially through said first and second rotors, said shaft having a threaded portion extending through a complementarily threaded portion of one of said first and second rotors; whereby; when said electromagnetic brake is locked and said rotary motor is rotated in a first direction, said shaft will move axially in a first direction; when said electromagnetic brake is locked and said rotary motor is rotated in a second direction; and when said electromagnetic brake is released and said rotary motor is rotated, said shaft will rotate with said rotary motor.
REFERENCES:
patent: 5093596 (1992-03-01), Hammer
patent: 5789830 (1998-08-01), Portegies et al.
Kowalski Keith
Palmero Albert
Crozier John H.
Jones Judson H.
Ramirez Nestor
Tri-tech, Inc.
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