Synchron motor
AssigneeSodeco-Saia AG
InventorKurt Guttinger
Life of this patent
Estimating the term…
Abstract
A synchronous motor which has a ring-shaped stator with a radially magnetized ring-shaped permanent magnet and an external housing of a material of high permeability to complete the magnetic circuit. At the inner side of this ring-shaped stator lies a rotor having a central core provided at its ends with pole rings of a material of high permeability. The coil of the motor is provided in the center of the stator and mounted between the pole rings. This construction gives rise to a high magnetic flux in the permanent magnet in the region of the poles of the rotor, which in turn, provides a high driving torque; while the rotor is made exclusively of material of high permeability, having a low weight and a low moment of inertia. Such motors, even when constructed to operate at relatively high power, are thus assured of positive starting.
Claims11
A synchronous motor comprising:
- a stator having a coil defining a void, and permanent magnet poles;
- and
- a rotor having a tubular rotor hub disposed in said coil void, said tubular hub having axial ends, a pair of pole rings connected to each axial end of said tubular hub said pairs of pole rings being disposed for cooperation with said permanent magnet poles, one pole ring of at least one of said pairs of pole rings being axially spaced and circumferentially shifted relative to the other pole ring of said pair, said pole ring of said axially-spaced pair closest to the end of said tubular hub being the outer pole ring and the other ring of said axially-spaced pair being the inner pole ring, and electrically-conducting disc means frictionally and rotatively mounted on said rotor between said pole rings of said axially-spaced pair for damping rotor oscillation and for acting as a loading element for phase-shifting magnetic flux generated in said outer pole ring.
A synchronous motor comprising:
- a stator having a coil defining a void, and permanent magnet poles;
- a rotor having a tubular rotor hub disposed in said coil void, said tubular hub having axial ends, a pair of pole rings connected to each axial end of said tubular hub said pairs of pole rings being disposed for cooperation with said permanent magnet poles, one pole ring of at least one of said pairs of pole rings being axially spaced and circumferentially shifted relative to the other pole ring of said pair, said pole ring of said axially-spaced pair closest to the end of said tubular hub being the outer pole ring and the other ring of said axially-spaced pair being the inner pole ring, electrically-conducting disc means rotatively mounted on said rotor between said pole rings of said axially-spaced pair for acting as a loading element for phase-shifting magnetic flux generated in said outer pole ring;
- and
- a spring cooperating with said disc means and one of said pole rings of said axially-spaced pair, said spring axially biasing said cooperating disc means and pole ring for creating friction in order to damp rotor oscillation.
A synchronous motor comprising:
- a stator having a coil defining a void, and permanent magnet poles;
- a rotor having a tubular rotor hub disposed in said coil void, said tubular hub having axial ends, a pair of pole rings connected to each axial end of said tubular hub said pairs of pole rings being disposed for cooperation with said permanent magnet poles, one pole ring of at least one of said pairs of pole rings being axially spaced and circumferentially shifted relative to the other pole ring of said pair, said pole ring of said axially-spaced pair closest to the end of said tubular hub being the outer pole ring and the other ring of said axially-spaced pair being the inner pole ring, an electrically-conducting disc means frictionally and rotatively mounted on said rotor between said pole rings of said axially-spaced pair for damping rotor oscillation and for acting as a loading element for phase-shifting magnetic flux generated in said outer pole ring;
- and
- a pair of bearing bushings rotationally mounting said tubular hub on a shaft, said bearing bushings having inwardly-directed tapered projections, a helical spring disposed between said shaft and said tubular hub, one end of said helical spring being attached to one of said projections and the other end of said helical spring being coupled to said shaft.
Dependencies are inferred from the claim text.