Electrical generator or motor structure – Dynamoelectric – Rotary
Utility Patent
1998-03-03
2001-01-02
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S256000, C310S06000A, C310S013000, C310S027000
Utility Patent
active
06169350
ABSTRACT:
BACKGROUND OF THE INVENTION
Conventional generators or motors are mostly constructed of the inter-pole ring-shaped magnetic circuits within single-sided or double-sided casings. The accumulated heat of the rotor and the magnetic field are usually cooled by an axial fan. As a result, when the electrical machine rotor is arranged to have a smaller diameter and a longer axial accumulated thickness, for example an air clearance between the rotor and the magnetic pole of around 0.2-1 mm (according to the parameter of power intensity, rotor diameter and rated rotating speed, etc.), the ventilation is poor.
SUMMARY OF THE INVENTION
The present invention provides an intercross-coupled magnetic circuit structure with uniform magnetic resistance obtained by adjusting the air clearance between magnetic poles and a corresponding driven rotor, and in particular by increasing the clearance between a particular magnetic pole and its corresponding driven rotor when the magnetic circuit connecting a pair of magnetic poles is shorter or the magnetic resistance of the magnetic circuit is smaller, and by decreasing the clearance when the magnetic circuit between the magnetic poles of the same pair is longer or the magnetic resistance is larger, so that the clearance at different symmetrical positions on the two sides of the magnetic axis of the particular magnetic pole varies, causing the magnetic force lines on the pole surface of the magnetic pole to be uniformly distributed, i.e., to appear symmetrical, in order to better meet electrical machine requirements by permitting a more narrow inter-pole magnetic circuit and providing a new method to effectively dissipate the accumulated heat inside the electrical machine. The magnetic circuit structure of the invention can use an intercrossed lamination construction, while maintaining the magnetic force line distribution status of the convention electrical machine magnetic circuit and the aforesaid more narrow inter-pole structure for more efficient heat dissipation. According to a further preferred embodiment of the invention, a field magnetic circuit structure with radial ventilation holes is provided, including a multiple section type iron core that has the advantage of reducing the size of the casting die and machining costs without hindering electrical machine characteristics.
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Bacon & Thomas, LLP
Dinh Le Dang
Ramirez Nestor
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