Motor
AssigneeHanon Systems
InventorsHyeon Jae SHIN, Seong Kook CHO, Ho Youn KIM, Jae Won LEE, Ho Bin IM, Kyung Hun JUNG
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Abstract
The present invention relates to a brushless motor, and an objective of the present invention is to provide a brushless motor which can significantly reduce the cogging torque and torque ripple of the motor by minimizing the rate of change of magnetoresistance in accordance with a change in position of a rotor through the optimization of the shape design of the rotor and a stator, and can also reduce the weight of the brushless motor through the optimization of the shape design taking into consideration the materials of the rotor and the stator.
Claims16
A motor comprising:
- a rotor including a plurality of permanent magnets disposed on an inner peripheral surface of a rotor core;
- and
- a stator including a plurality of teeth disposed along a circumferential direction of a stator core and pole shoes formed at distal ends of the teeth facing the permanent magnets,
- wherein when the rotor rotates, the permanent magnet becomes gradually close to an outer peripheral surface of a central portion of the pole shoe, passes through the outer peripheral surface of the central portion of the pole shoe, and then becomes gradually distant from the outer peripheral surface of the central portion of the pole shoe.
The motor of claim, wherein when an angle between both distal ends of the pole shoe with respect to the center C of rotation of the rotor is θ3, a relationship of θ2<θ3 is satisfied.
The motor of claim, wherein when an angle between both distal ends of the outer peripheral surface of the central portion of the pole shoe with respect to a center C of rotation of the rotor is θ4, a relationship of 0°≤θ4≤1.5° is satisfied.
The motor of claim, wherein when an angle between the outer peripheral surfaces of both end portions of the pole shoe and a tangent of the outer peripheral surface of the central portion of the pole shoe at points where the central portion and both end portions of the pole shoe meet each other is β, a relationship of 7°≤β≤9° is satisfied.
Dependencies are inferred from the claim text.