Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-06-28
1994-09-06
Peckman, Kristine L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 49R, H02K 3702
Patent
active
053451317
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Technical field and Prior Art
The present invention relates to a rotary electric motor which has a single, predetermined direction of rotation and which can be controlled in respect of its supply with current and its speed by a simple electronic circuit. The motor is a further development of the type of motor described and shown in Swedish Patent Application 8802972-3 (=WO 90/02437).
OBJECT OF THE INVENTION
The motor described and illustrated in the aforesaid Swedish patent application has been found to function very well and affords all of the advantages recited in the application. Continued development has shown, however, that further improvements in the form of lower manufacturing costs and/or higher motor torque can be achieved without change of the motor size, at least for some fields of use, by constructing the motor in a manner which deviates slightly from the manner described in the aforesaid Swedish patent application.
According to the present invention, these further improvements are obtained with a motor constructed according to the invention, without losing any of the advantages afforded by the basic motor design, as described in the aforesaid patent application.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to a number of exemplifying embodiments thereof and also with reference to the accompanying drawings, in which:
FIG. 1 is a schematic, principle end view of a first exemplifying embodiment of a motor according to the invention;
FIG. 2 illustrates in a similar fashion a second exemplifying embodiment of a motor according to the invention;
FIG. 3 is a similar illustration of a third exemplifying embodiment of a motor according to the invention;
FIG. 4 is a schematic principle partial end view of a fourth exemplifying embodiment of a motor according to the invention;
FIG. 5 is a schematic principle end view of a fifth exemplifying embodiment of a motor according to the invention; and
FIG. 6 is a schematic developed view of the construction and the arrangement of the rotor poles in the motor illustrated in FIG. 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S)
As explained in Swedish Patent Application 8802972-3, the type of motor described therein operates in accordance with the reluctance principle. One of the two mutually rotatable parts of the motor, normally the rotor, is provided with a ring of ferromagnetic reluctance poles arranged with a uniform pole pitch and uniform pole gaps, and the other part of the motor, normally the stator, is provided with a ring of alternating ferromagnetic poles and permanent-magnetic poles, which are magnetized with the aid of a magnetizing winding.
The number of permanent-magnetic poles and the number of ferromagnetic poles equal the number of reluctance poles on the rotor, such that the pole pitch of the stator is half the pitch of the rotor poles.
Furthermore, each rotor reluctance pole has a width in the rotational or circumferential direction which over a portion of the reluctance pole equals half the pole pitch of the reluctance poles and which over the remaining portion of the pole is smaller and preferably corresponds to a third of the pole pitch of the reluctance poles, such that each reluctance pole has a part which projects in a predetermined rotational direction common to all reluctance poles.
The ferromagnetic and permanent-magnetic stator poles have a width as measured in the direction of rotation which essentially equals the reduced width of the rotor reluctance and are magnetically divided into groups of mutually adjacent ferromagnetic and permanent-magnetic poles, with the same number of each pole type in each group. All permanent-magnetic poles within each such magnetic pole group have the same permanent-magnetic polarity and all of the permanent-magnetic and the ferromagnetic poles are magnetized in one and the same direction through the influence of the magnetizing winding.
With this design, the motor has only one, predetermined start directi
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Haszko D. R.
Peckman Kristine L.
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