Back to results
US 2002/0053848 A1Published application
Compound motor and operational method thereof
OwnerAkiko Taira, Atsushi Ooyamainventors
Life of this patent
Estimating the term…
Abstract
A compound motor comprising a plurality of motors, each motor comprising a rotating member that is rotatably supported and a stator winding, wherein all rotating members share the same axis of rotation and the stator winding of each motor has a different number of poles.
Claims9
A compound motor comprising a plurality of motors, each motor comprising:
- a stator having a stator winding;
- and
- a rotating member that is rotatably supported on said stator;
- wherein all rotating members of said motors share same axis of rotation, and the stator winding of each motor has a different number of poles.
1 more element
A vacuum pump having an inlet and an exhaust and comprising a plurality of motors, each motor comprising:
- a stator having a stator winding;
- a rotating member that is rotatably supported by bearings on said stator, and can rotate independently of one another;
- and
- blades disposed on said rotating member for evacuation;
- wherein all rotating members of said motors share same axis of rotation, and the stator winding of each motor has a different number of poles.
2 more elements
A method for operating a compound motor comprising:
- arranging a plurality of motors with differing numbers of stator winding poles such that the motors share the same axis of rotation;
- connecting the stator windings of each motor in parallel to a single power circuit capable of supplying an exciting current to the stator windings;
- and
- operating the plurality of motors at speed ratios fixed by differing rotational speeds of each motor by supplying an exciting current of a prescribed frequency to each motor simultaneously.
1 more element
Dependencies are inferred from the claim text.