Brushless DC motor and method of manufacturing brushless DC motor
First Claim
1. A brushless DC motor comprising:
- a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and
a stator having plural slots arranged at an equal pitch in a circumferential direction, wherein the magnetic poles of said rotor include magnetic poles whose magnet deviation angle formed by a central line of an effective polar opening angle and a central line of said magnet mounting hole is a first angle; and
magnetic poles whose magnet deviation angle is a second angle different from the first angle.
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Accused Products
Abstract
A brushless DC motor including a stator having plural slots; and a rotor which has plural permanent magnets and is divided into three rotor blocks in a rotation axis direction, the three rotor blocks being layered so that the arrangement angles of the rotor blocks differ from each other by an amount of a mechanical angle in a rotary direction that is equivalent to one third of a pulsation period of cogging torque generated by the rotor and stator. A brushless DC motor including a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and a stator having plural slots arranged at an equal pitch in a circumferential direction. The magnetic poles of the rotor include magnetic poles whose magnet deviation angle formed by the central line of an effective polar opening angle and the central line of the magnet mounting hole is the first angle; and magnetic poles whose magnet deviation angle is the second angle different from the first angle.
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Citations
10 Claims
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1. A brushless DC motor comprising:
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a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and
a stator having plural slots arranged at an equal pitch in a circumferential direction, wherein the magnetic poles of said rotor include magnetic poles whose magnet deviation angle formed by a central line of an effective polar opening angle and a central line of said magnet mounting hole is a first angle; and
magnetic poles whose magnet deviation angle is a second angle different from the first angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A brushless DC motor comprising:
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a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and
a stator having plural slots arranged at an equal pitch in a circumferential direction, wherein said rotor comprises convex portions corresponding to the magnetic poles on its circumference, and the magnetic poles of said rotor include magnetic poles whose convex portion deviation angle formed by a central line of said convex portion and a central line of said magnet mounting hole is a first angle; and
magnetic poles whose convex portion deviation angle is a second angle different from the first angle.
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10. A brushless DC motor comprising:
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a rotor having plural magnetic poles provided at an equal pitch in a circumferential direction by mounting permanent magnets in magnet mounting holes; and
a stator having plural slots arranged at an equal pitch in a circumferential direction, wherein said rotor comprises convex portions corresponding to the magnetic poles on its circumference, and the magnetic poles of said rotor include magnetic poles whose magnet deviation angle formed by a central line of an effective polar opening angle and the central line of said magnet mounting hole and whose convex portion deviation angle formed by a central line of said convex portion and a central line of said magnet mounting hole are both first angle; and
magnetic poles whose magnet deviation angle and convex portion deviation angle are both second angle different from the first angle.
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Specification