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US 5,396,137 AGranted
Brushless motor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMasayuki Shinto, Hiroshi Dohi
Life of this patent
Estimating the term…
Abstract
In a brushless motor having a stator with windings mounted in plural slots and a rotor with a permanent magnet consisting of plural poles, the poles have two kinds of occupation angles on the whole in the rotating direction of the rotor, and a difference between the two occupation angles is equal to one slot-pitch.
Claims10
A brushless motor comprising:
- a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval;
- and
- a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator;
- said plurality m being a divisor of said plurality n, and said plurality m of pole pieces having two different occupation angles .THETA..sub.L and .THETA..sub.S in a rotating direction of said rotor on a whole, said occupation angle .THETA..sub.L being larger than said second occupation angle .THETA..sub.S by an angle of (360.degree./n).
1 more element
A brushless motor comprising:
- a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval;
- and
- a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator;
- said plurality n being an integer larger than three;
- said plurality m being a divisor of said plurality n;
- and
- said plurality m of pole pieces of said rotor each having an occupation angle in a rotating direction of said rotor, said occupation angle being one of a first occupation angle .THETA..sub.L and a second occupation angle .THETA..sub.S, said first occupation angle .THETA..sub.L being larger than said second occupation angle .THETA..sub.S by an angle of (360.degree./n) .
4 more elements
A brushless motor comprising:
- a stator including a stator core and stator windings, said stator core having a plurality n of teeth members which define therebetween said plurality n of slots disposed at a uniform angular interval;
- and
- a rotor including a rotor core and a permanent magnet which consists of a plurality m of pole pieces facing said stator, a first one of said plurality m of pole pieces being disposed at a first occupation angle .THETA..sub.L and a second one of said plurality m of pole pieces being disposed at a second occupation angle .THETA..sub.S different from said first occupation angle .THETA..sub.L, said first occupation angle .THETA..sub.L and said second occupation angle .THETA..sub.S being in a rotating direction of said rotor;
- said plurality m being a divisor of said plurality n;
- and
- said first occupation angle .THETA..sub.L being larger than said second occupation angle .THETA..sub.S by an angle of (360.degree./n).
3 more elements
Dependencies are inferred from the claim text.