Startup device for the rotor of a permanent-magnet synchronous motor
First Claim
1. A startup device for a rotor of a permanent-magnet synchronous motor of the type having:
- a stator unit with a pack of metal laminations and electrical windings supported by a body, said body forming between poles of the stator unit, a substantially cylindrical chamber;
a rotor unit, including a permanent-magnet rotor being accommodated in said chamber; and
a shaft which crosses axially said rotor unit;
said device comprising;
a cup-shaped cylindrical element being accommodated in said cylindrical chamber, said rotor unit being enclosed within said cup-shaped cylindrical element so as to freely rotate with respect to said shaft;
a lid for hermetically closing said cup-shaped element, said lid being rigidly coupled to said shaft, said cup-shaped element and said lid being jointly rotatable with said shaft;
motion transmission means being provided between said permanent-magnet rotor and said shaft, and said transmission means being enclosed inside the cup-shaped element;
wherein said transmission means causes rotation of said shaft after said permanent-magnet rotor, being activated by said stator, is turned without a load through a given rotation angle.
1 Assignment
0 Petitions
Accused Products
Abstract
An improved startup device for the rotor of a permanent-magnet synchronous motor, particularly adapted for liquid conveyance pumps, such as those used in electrical household appliances or the like, which are equipped with a permanent-magnet synchronous motor of the type comprising a stator unit with a pack of metal laminations and electrical windings supported by a body that forms a substantially cylindrical chamber that accommodates, upon assembly, the rotor unit, which is axially crossed by a motor shaft. The rotor unit comprises a cup-shaped cylindrical element that is closed hermetically by means of a lid and is rigidly coupled to the shaft either directly or by means of the lid; the permanent-magnet rotor is rotatably accommodated inside the cup-like element and rotates freely with respect to the shaft; motion transmission teeth are provided between the rotor and the shaft and are adapted to cause the rotation of the shaft after the rotor, activated by the stator, has turned without a load through a given rotation angle.
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Citations
23 Claims
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1. A startup device for a rotor of a permanent-magnet synchronous motor of the type having:
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a stator unit with a pack of metal laminations and electrical windings supported by a body, said body forming between poles of the stator unit, a substantially cylindrical chamber; a rotor unit, including a permanent-magnet rotor being accommodated in said chamber; and a shaft which crosses axially said rotor unit; said device comprising; a cup-shaped cylindrical element being accommodated in said cylindrical chamber, said rotor unit being enclosed within said cup-shaped cylindrical element so as to freely rotate with respect to said shaft; a lid for hermetically closing said cup-shaped element, said lid being rigidly coupled to said shaft, said cup-shaped element and said lid being jointly rotatable with said shaft; motion transmission means being provided between said permanent-magnet rotor and said shaft, and said transmission means being enclosed inside the cup-shaped element; wherein said transmission means causes rotation of said shaft after said permanent-magnet rotor, being activated by said stator, is turned without a load through a given rotation angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification