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1. WO1997043820 - ELECTROMOTEUR A COURANT CONTINU TRIPHASE SANS BALAIS A COMMUTATION ELECTRONIQUE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

Claims

1. Three-phase electronically commutated brushless DC-electromotor having laminated stator plates (1) with equidistant slots wherein phase windings (k) are placed which excite the same number of non-salient magnetic poles in the stator as they are comprised in the rotor
and the rotor with permanent magnets (4)
and in which an electronic circuit (5) besides the commutation of the stator windings (k) as its basic function also performs the electromotor starting and stopping and regulation of the rotational speed of the electromotor,
characterized in
that the beginnings of the stator windings (k) for individual phases are spatially distributed along the periphery with respect to each other so that the created magnetic field is shifted from phase to phase for 2/3 T, T being the pole pitch,
and that it is provided with three rotor position sensors (6; OD1, OD2, OD3) situated above the rotor periphery with mutual angle spacing A being equal to 2T/3.

2. Three-phase electronically commutated brushless DC-electromotor as recited in claim 1, characterized in
that the permanent magnets (4) jut out from the region of the stator plates (1) so that the rotor with its extended part and with magnetic poles situated thereon directly influences the state of the rotor position sensors (6; OD1, OD2, OD3) situated in the next vicinity of the rotor periphery.

3. Three-phase electronically commutated brushless DC-electromotor as recited in claim 1 or 2, characterized in
that in the control and regulation circuit (5) a pulse-width modulator (g) with an input is comprised, which modulator through the rest of the circuit influences the chopping of the voltage for excitation of the stator windings (k), the chopping being proportional to the input state.

AMENDED CLAIMS
[received by the International Bureau on 30 October 1997 (30.10.97) ; original claim 1 amended ; remaining claims unchanged ( 1 page) ]

1. Three-phase electronically commutated brushless DC-electromotor having laminated stator plates (1) with equidistant slots wherein phase windings (k) are placed which excite the same number of non-salient magnetic poles in the stator as they are comprised in the rotor
and the rotor with permanent magnets (4)
and three rotor position sensors (6; ODl, OD2, OD3) situated above the rotor periphery with mutual angle spacing A being equal to 2T/3, T being the pole pitch, and in which an electronic circuit (5) besides the commutation of the stator windings (k) as its basic function also performs the electromotor starting and stopping and regulation of the rotational speed of the electromotor,
characterized in
that the beginnings of the stator windings (k) for individual phases are spatially distributed along the periphery with respect to each other so that the created magnetic field is shifted from phase to phase for 2/3 T.

2. Three-phase electronically commutated brushless DC-electromotor as recited in claim 1, characterized in
that the permanent magnets (4) jut out from the region of the stator plates (1) so that the rotor with its extended part and with magnetic poles situated thereon directly influences the state of the rotor position sensors (6; ODl, OD2, OD3) situated in the next vicinity of the rotor periphery.

3. Three-phase electronically commutated brushless DC-electromotor as recited in claim 1 or 2, characterized in
that in the control and regulation circuit (5) a pulse-width modulator (g) with an input is comprised, which modulator through the rest of the circuit influences the chopping of the voltage for excitation of the stator windings (k), the chopping being proportional to the input state.

AMENDED SHEET {ARTICLE 19)

STATEMENT UNDER ARTICLE 19

Claim 1 has been amended to take into account that the manner of situating the rotor sensors is a technical feature which is known from US 5 291 104 which was