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US 8,796,897 B2Granted
Consequent pole permanent magnet motor
AssigneeDenso Corporation
InventorsMakoto Taniguchi, Asuka Tanaka
Life of this patent
Estimating the term…
Abstract
In a motor, an armature is provided to be opposite to a rotor member for generating a rotating magnetic field. In the armature, plural sets of teeth are arranged in a direction of rotation of the rotor member such that each set of teeth in the plural sets of teeth is within one electrical angular cycle of the rotating magnetic field. The one electrical angular cycle corresponds to one pole-pair pitch of the annular rotor member. A number of teeth in the plurality of teeth within the one pole-pair pitch is set to 2k (k is a natural number), and a number of teeth facing each of the first magnetic poles in the plurality of teeth is set to be equal to or greater than the sum of k and 1.
Claims15
A motor comprising:
- an annular rotor member made of a soft magnetic material and rotatably provided in the motor, the rotor member comprising:
- a plurality of first magnetic poles arranged in a circumferential direction of the rotor member at spaces therebetween, each of the plurality of first magnetic poles being formed by an outer peripheral portion of the rotor member and a permanent magnet, the plurality of first magnetic poles having a same first magnetic polarity;
- and
- a plurality of second magnetic poles radially extending from the rotor member and respectively arranged between the plurality of first magnetic poles, the plurality of second magnetic poles being consequently magnetized as a plurality of consequent poles by the plurality of first magnetic poles, the plurality of second magnetic poles having a same second magnetic polarity that is opposite to the first magnetic polarity;
- and
- an armature provided to be opposite to the rotor member for generating a rotating magnetic field, the armature comprising:
- plural sets of teeth arranged in a direction of rotation of the rotor member such that each set of teeth in the plural sets of teeth is within one electrical angular cycle of the rotating magnetic field, the one electrical angular cycle corresponding to one pole-pair pitch of the annular rotor member,
- a number of teeth in the plural sets of teeth within the one pole-pair pitch being set to 2k (k is a natural number), a number of teeth facing each of the first magnetic poles in the plurality of teeth being set to be equal to or greater than the sum of k and 1.
5 more elements
A motor comprising:
- an annular rotor member made of a soft magnetic material and rotatably provided in the motor, the rotor member comprising:
- a plurality of first magnetic poles arranged in a circumferential direction of the rotor member at spaces therebetween, each of the plurality of first magnetic poles being formed by an outer peripheral portion of the rotor member and a permanent magnet;
- and
- a plurality of second magnetic poles radially extending from the rotor member and respectively arranged between the plurality of first magnetic poles, the plurality of second magnetic poles being consequently magnetized as a plurality of consequent poles by the plurality of first magnetic poles;
- and
- an armature provided to be opposite to the rotor member for generating a rotating magnetic field, the armature comprising:
- plural sets of teeth arranged in a direction of rotation of the rotor member such that each set of teeth in the plural sets of teeth is within one electrical angular cycle of the rotating magnetic field, the one electrical angular cycle corresponding to one pole-pair pitch of the annular rotor member,
- a number of teeth in the plural sets of teeth within the one pole-pair pitch being set to 2k (k is a natural number), a number of teeth facing each of the first magnetic poles in the plurality of teeth being set to be equal to or greater than the sum of k and 1,
- wherein a pitch between adjacent teeth in the plural sets of teeth is set to an integer submultiple of 60 electrical degrees, and
- wherein the teeth of the plural sets are arranged in the direction of rotation of the rotor member at regular spaces, the spaces being a plurality of slots, a number of slots per pole in the armature is set to two, the pitch between adjacent teeth in the plural sets of teeth is set to 30 electrical degrees, the number of teeth facing each of the first magnetic poles in the plural sets of teeth is set to seven, and a number of teeth facing each of the second magnetic poles in the plural sets of teeth is set to five.
7 more elements
A motor comprising:
- an annular rotor member made of a soft magnetic material and rotatably provided in the motor, the rotor member comprising:
- a plurality of first magnetic poles arranged in a circumferential direction of the rotor member at spaces therebetween, each of the plurality of first magnetic poles being formed by an outer peripheral portion of the rotor member and a permanent magnet;
- and
- a plurality of second magnetic poles radially extending from the rotor member and respectively arranged between the plurality of first magnetic poles, the plurality of second magnetic poles being consequently magnetized as a plurality of consequent poles by the plurality of first magnetic poles;
- and
- an armature provided to be opposite to the rotor member for generating a rotating magnetic field, the armature comprising:
- plural sets of teeth arranged in a direction of rotation of the rotor member such that each set of teeth in the plural sets of teeth is within one electrical angular cycle of the rotating magnetic field, the one electrical angular cycle corresponding to one pole-pair pitch of the annular rotor member,
- a number of teeth in the plural sets of teeth within the one pole-pair pitch being set to 2k (k is a natural number), a number of teeth facing each of the first magnetic poles in the plurality of teeth being set to be equal to or greater than the sum of k and 1,
- wherein a pitch between adjacent teeth in the plural sets of teeth is set to an integer submultiple of 60 electrical degrees, and
- wherein the teeth of the plural sets are arranged in the direction of rotation of the rotor member at regular spaces, the spaces being a plurality of slots, a number of slots per pole in the armature is set to three, the pitch between adjacent teeth in the plural sets of teeth is set to 20 electrical degrees, the number of teeth facing each of the first magnetic poles in the plural sets of teeth is set to ten, and a number of teeth facing each of the second magnetic poles in the plural sets of teeth is set to eight.
7 more elements
Dependencies are inferred from the claim text.