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Patent Searching and Data


Title:
BRUSHLESS MOTOR
Document Type and Number:
Japanese Patent JPH04289759
Kind Code:
A
Abstract:

PURPOSE: To provide a brushless motor having reduced dimensions in which fluctuation of characteristics is suppressed by improving accuracy in the fixing position of a pole sensor.

CONSTITUTION: In case of a three-phase brushless motor as shown on the drawing, first, second and third phase coils are wound, respectively, around a plurality of adjacent stator teeth 21, 22, 23 (stator tooth group), stator teeth 24, 25, 26 and stator teeth 27, 28, 29. Since the number of rotor pole is higher by one or two than the number of stator teeth although the stator tooth pitch Ps is approximately same as the rotor pole pitch Pp, slot opening between the stator tooth groups is widened and pole sensors 9u, 9v, 9w can be installed. Since the pole sensors 9u-9w are installed with reference to a stator core 1, they are installed with high accuracy and fluctuation of motor characteristics is suppressed. Furthermore, rotor magnet 4a is shortened in axial length and thereby motor dimensions are decreased.


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Inventors:
Mehara, Kouji
Application Number:
JP1991000052118
Publication Date:
October 14, 1992
Filing Date:
March 18, 1991
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H02K21/14; H02K29/08; (IPC1-7): H02K21/14; H02K29/08