ANISOTROPIC PERMANENT MAGNET MOTOR
First Claim
Patent Images
1. An anisotropic permanent magnet motor comprising:
- a stator which includes a stator core provided with an annular stator yoke, a plurality of teeth protruding from the stator yoke in a radial direction, and a slot formed between the teeth and a plurality of coils wound around the teeth; and
a rotor which includes a cylindrical rotor yoke and an anisotropic permanent magnet disposed on a surface of the rotor yoke and is opposed to the teeth with a gap therebetween,wherein the anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both θ
r°
/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface,wherein when an angle for each pole is denoted by Op, an angle for one cycle of cogging torque generated by the anisotropic permanent magnet is denoted by θ
c, and a natural number is denoted by a, θ
p/θ
c=3×
a,wherein when a maximum value of the cogging torque in a range of θ
r/θ
c≦
{(θ
p/θ
c)−
2} is denoted by an allowable maximum value of the cogging torque, θ
r/θ
c corresponding to the cogging torque equal to the allowable maximum value in a range where θ
r/θ
c satisfies a relationship of {(θ
p/θ
c)−
2}≦
θ
r/θ
c≦
{(θ
p/θ
c)−
1} is obtained, andwherein when the obtained θ
r/θ
c is denoted by P, an angle of θ
r is set so that θ
r/θ
c is not more than P.
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Abstract
An anisotropic permanent magnet motor includes a stator and a rotor opposed to teeth of the stator with a gap therebetween, and the rotor includes an anisotropic permanent magnet disposed on a surface of a rotor yoke. The anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both θr°/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface.
21 Citations
8 Claims
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1. An anisotropic permanent magnet motor comprising:
-
a stator which includes a stator core provided with an annular stator yoke, a plurality of teeth protruding from the stator yoke in a radial direction, and a slot formed between the teeth and a plurality of coils wound around the teeth; and a rotor which includes a cylindrical rotor yoke and an anisotropic permanent magnet disposed on a surface of the rotor yoke and is opposed to the teeth with a gap therebetween, wherein the anisotropic permanent magnet has an orientation direction set in a direction normal to the outer-peripheral surface in a range of both θ
r°
/2 from a magnetic pole center and continuously inclined toward a magnetic pole end with respect to a direction normal to the outer-peripheral surface,wherein when an angle for each pole is denoted by Op, an angle for one cycle of cogging torque generated by the anisotropic permanent magnet is denoted by θ
c, and a natural number is denoted by a, θ
p/θ
c=3×
a,wherein when a maximum value of the cogging torque in a range of θ
r/θ
c≦
{(θ
p/θ
c)−
2} is denoted by an allowable maximum value of the cogging torque, θ
r/θ
c corresponding to the cogging torque equal to the allowable maximum value in a range where θ
r/θ
c satisfies a relationship of {(θ
p/θ
c)−
2}≦
θ
r/θ
c≦
{(θ
p/θ
c)−
1} is obtained, andwherein when the obtained θ
r/θ
c is denoted by P, an angle of θ
r is set so that θ
r/θ
c is not more than P. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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Current AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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Original AssigneePanasonic Corporation (Panasonic Holdings Corporation)
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InventorsYamashita, Fumitoshi, Kawamura, Kiyomi, Murakami, Hiroshi
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current310/156.430
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CPC Class CodesH02K 1/278 Surface mounted magnets; In...
