Low profile ring-shaped motor
AssigneeAllied Corporation
InventorsRobert D. Hall, Jeffrey T. Major
Life of this patent
Estimating the term…
Abstract
A low profile ring-shaped motor has a housing, a bearing support attached to the housing and supporting a rotating shaft carrying a ring-shaped rotor. A ring-shaped stator is secured to the housing and is concentric and between the legs of the U-shaped rotor. The stator is formed by a continuous strip of magnetic material wound and laminated in a toroid and having helical windings therearound. On the inside of the legs of the rotor are mounted a plurality of permanent magnets forming the poles of the motor. Radially opposite magnets are of the same polarity. Control of the switching of the current through the windings is by means of Hall Effect devices sensing the change in polarity of a ring shaped magnet means having the same number of poles as does the permanent magnets.
Claims10
A ring-shaped motor comprising, in combination:
- a housing;
- a rotatable shaft;
- a bearing support secured to said housing for rotatably supporting said shaft;
- a ring-shaped stator secured to said housing concentric with said bearing support, said stator including a laminated core with a plurality of helical windings thereon;
- a rotor secured to said rotatable shaft and rotatable therewith, said rotor including a base and two substantially concentric rims extending from said base, both of said rims substantially concentric with and on opposite sides of said stator;
- and
- control means for applying electrical power to said windings.
A ring-shaped, brushless motor comprising, in combination:
- a housing;
- a rotatable shaft;
- a bearing support secured to said housing for rotatably supporting said shaft;
- a ring-shaped stator secured to said housing concentric with said bearing support, said stator including a laminated core with a plurality of helical windings thereon;
- a rotor secured to said rotatable shaft and rotatable therewith, said rotor including a base and inner rim extending from said base, said rim being substantially concentric with said stator;
- an inner magnetic ring attached to said inner rim of said rotor, and inner magnetic ring including a predetermined number of substantially contiguous magnets;
- sensing means, mounted on said housing, for sensing a polarity change of said inner magnetic ring as said rotor rotates past said sensing means and responsively issuing a control signal;
- and
- control means, interconnected to said sensing means, for receiving said control signal and responsively applying electrical power to said helical windings.
A ring-shaped motor comprising, in combination:
- a housing;
- a rotatable shaft;
- a bearing support secured to said housing for rotatably supporting said shaft;
- a ring-shaped stator secured to said housing concentric with said bearing support, said stator including a laminated core with a plurality of helical windings thereon;
- a rotor secured to said rotatable shaft and rotatable therewith, said rotor including a base and inner and outer substantially concentric rims extending from said base, both of said rims substantially concentric with and on opposite sides of said stator;
- an inner magnetic ring attached to said inner rim of said rotor, said inner magnetic ring including a predetermined number of substantially contiguous magnets;
- an outer magnetic ring attached to said outer rim of said rotor, said outer magnetic ring including said same predetermined number of substantially contiguous magnets;
- sensing means, mounted on said housing, for sensing a polarity change of said inner and outer magnetic rings as said rotor rotates past said sensing means and responsively issuing a control signal;
- and
- control means, interconnected to said sensing means, for receiving said control signal and responsively applying electrical power to said helical windings.
Dependencies are inferred from the claim text.