PERMANENT MAGNET SYNCHRONOUS MOTOR
First Claim
1. A permanent magnet synchronous motor, comprising:
- a rotor having a rotor core in which plural permanent magnets are provided at an outer periphery, supported so as to rotate freely; and
a stator having stator windings and a stator core, provided at the outside of the rotor through a gap, andwherein, when a gap length between the outer periphery of the permanent magnet and an inner periphery of the stator core is “
L”
[mm] an a thickness of the central portion of the permanent magnet in the motor rotation direction is “
t”
[mm], the gap length “
L” and
the thickness “
t”
are set in a range of
L≦
1 [mm] as well as t/(t+L)≦
0.9.
1 Assignment
0 Petitions
Accused Products
Abstract
To obtain a permanent magnet synchronous motor suitable for an electric power steering system, in which the magnet thickness (magnet used amount) can be reduced while securing demagnetization resistance and torque characteristics. In a permanent magnet synchronous motor including a rotor in which plural permanent magnets are arranged at an outer periphery of a rotor core, which is supported so as to rotate freely, and a stator provided at the outside of the stator and having stator windings 5 and a stator core, when a gap length between the outer periphery of the permanent magnet and an internal periphery of the stator core is “L” [mm] and the thickness of the central portion of the permanent magnet in the motor rotation direction is “t” [mm], the gap length “L” and the thickness “t” is set in a range of
L≦1 [mm] as well as t/(t+L)≦0.9
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Citations
10 Claims
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1. A permanent magnet synchronous motor, comprising:
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a rotor having a rotor core in which plural permanent magnets are provided at an outer periphery, supported so as to rotate freely; and a stator having stator windings and a stator core, provided at the outside of the rotor through a gap, and wherein, when a gap length between the outer periphery of the permanent magnet and an inner periphery of the stator core is “
L”
[mm] an a thickness of the central portion of the permanent magnet in the motor rotation direction is “
t”
[mm], the gap length “
L” and
the thickness “
t”
are set in a range of
L≦
1 [mm] as well as t/(t+L)≦
0.9. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification
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- Resources
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Current AssigneeMitsubishi Electric Corporation
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Original AssigneeMitsubishi Electric Corporation
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InventorsAsao, Yoshihito, Takashima, Kazuhisa, AKUTSU, Satoru
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Application NumberUS12/139,991Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current310/156.38CPC Class CodesH02K 1/278 Surface mounted magnets; In...H02K 11/21 Devices for sensing speed o...H02K 21/14 with magnets rotating withi...H02K 21/145 having an annular armature ...
