| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary detection structure of a motor for achieving automatic operation by increasing a ripple voltage and making equal a cogging torque and the number of parts in a method for detecting the ripple voltage of a commutated waveform. SOLUTION: In the rotation detection structure of a motor used for automatic operation of a switching device such as the powered window of a vehicle, the rotor of the motor is provided with an armature core 3 with a plurality of slots 1 between teeth 2, a plurality of coils 4 wound around each slot, and a commutator 6 with a plurality of segments 5 where each of the coils 4 is connected. Also, the number of turns of each of the coils 4 changes for each slot 1, and segments 5 (3), (4) (8), (9)} and (5), (6) (10), (1)} where different numbers of turns (a) and (b) are adjust have large potential difference, the ripple voltage when the armature core 3 rotates becomes larger as compared with are with the same number of turns. |
