| 摘要 |
A conveyor unit ( 2 ) including a driving roller ( 5 ), a motor ( 30 ) for powering the driving roller ( 5 ), and a controller ( 10 ) adapted to adjust the motor ( 30 ) so as to control the driving roller ( 5 ), the motor ( 30 ) including a permanent magnet and an armature having a plurality of armature coils ( 32 a -32 c), and the controller ( 10 ) having an interrupter ( 15 ) adapted to repeat shunting and deshunting of at least one of the coils ( 32 a -32 c) and a rotation detector ( 17 ) adapted to detect an externally forced rotation of the motor ( 30 ) in response to an electromotive force induced in at least one of the coils ( 32 a -32 c), wherein in the case that the motor ( 30 ) is not driven, the controller ( 10 ) maintains operations of the interrupter ( 15 ) and outputs a presence signal by determining conveyance of an article (W) into an area powered by the motor ( 30 ) upon detection of the rotation of the motor ( 30 ) by means of the rotation detector ( 17 ).
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