| 摘要 |
PROBLEM TO BE SOLVED: To lessen components of a linear motor making a door body run and to reduce the cost. SOLUTION: A stator 1 having coils 11 arranged is provided at a lintel of a door frame, and a movable unit 2 having permanent magnets 21 so arranged as to be heteropolar alternately in the moving direction is provided on a door body 3. The distance between adjacent coils 11 is set to be larger than a distance between homopolar magnetic poles in the permanent magnets 21. Accordingly, the number of the coils 11 is made small relatively and the constitution is simplified, while the cost is reduced. |
