Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2000-04-06
2001-11-06
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S256000
Reexamination Certificate
active
06313557
ABSTRACT:
The present invention refers to an electric motor of the electronic commutation type for applications with a feeder line.
Electric motors of the already known electronic type include a stator, a rotor rotatably coupled to the stator itself so that it rotates on a rotation axis, an electric device that feeds and controls the electric motor itself and at least two inductors located between the electronic device and the feeder line to keep the harmonic content of the line current inside the prescribed limits.
In the electric motors of the above mentioned type the rotor and the stator are generally defined by a plurality of metal core laminations which are packed among themselves and are made by shearing a metal strap, the rotors comprising a plurality of permanent magnets uniformly distributed around the rotation axis and supported by the respective package of core laminations, while the stator comprises a number of stator teeth uniformly distributed around the rotation axis itself and an external case which contains and assembles the teeth, and defines, together with the teeth themselves, slots to house the respective stator windings.
The above mentioned electric motors presents a few structural and economical disadvantages. From the structural point of view, the electric motors described above produce quite a high noise which is especially annoying in the case of line fed applications such as electric household appliances.
From the economical point of view, it must be stressed that the electric motors described above are produced in great number so that off-cuts from the shearing of the already mentioned metal laminations will mean either a significant saving when properly used, or a significant cost when disposed of. Besides, the presence of any construction element subsequently assembled to the electric motors themselves, in order to guarantee a correct operation, has an effect on the production costs.
It is an object of the present invention to provide an electric motor of the electronic commutation type for applications with a feeder line, which is not only silent while operating but is also economical from the production point of view.
According to the present invention, an electric motor of the electronic commutation type for applications with a feeder line is provided, said electric motor comprising a rotor rotating around an axis of rotation, and a number of stator teeth uniformly distributed around the axis of rotation itself, along the respective radial directrixes projecting from a centre of rotation of the rotor located on the axis of rotation, each stator tooth presenting a respective internal cylindrical surface facing said rotor and radially limiting the tooth itself; the motor being characterised in that said internal surface presents a bending centre located at any point along the relative radial directix with the exception of a part included between said centre of rotation and the internal surface itself excluding the centre of rotation and the internal surface.
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Casti Sergio
De Filippis Pietro
Fasola Giancarlo
Maggi Flavio
Bitron S.P.A.
Dinh Le Dang
Merchant & Gould P.C.
Ramirez Nestor
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