| 摘要 |
In a brushless d.c. motor with a permanent magnet rotor with the recessing of a radial narrow air gap, a part of the flux emanating from the rotor is concentrated onto a stationary magnetic flux sensitive control member which controls a commutator circuit. For concentration of the flux onto the control member, there is used a stationary magnetic flux conductor which extends between unlike rotor poles under recessing of a narrow air gap on both its ends. At least one of these air gaps is radially directed.
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