| 摘要 |
PROBLEM TO BE SOLVED: To provide a power tool with a linear motor capable of improving motor efficiency and increasing output by reducing leakage of a magnetic flux passing between an armature and a needle and reducing magnetic attraction force generated between the armature and the needle to eliminate a mechanism part which is conventionally a generating source of vibration of noise of the power tool. SOLUTION: The linear motor has one magnetic pole dentition magnetically connected to one magnetic pole of the armature and arranged separately in a first stage and a second stage roughly in the vertical direction against the moving direction of the needle and the other magnetic pole arrangement magnetically connected to the other magnetic pole of the needle and separately arranged in a first stage and a second stage roughly in the vertical direction against the moving direction of the needle, a magnetic pole tooth of the first stage of the magnetic pole arrangement provided on the one and a magnetic pole tooth of the first stage of the magnetic pole dentition provided on the other are alternately arranged against the moving direction of the needle, a magnetic pole tooth of the second stage of the magnetic pole arrangement on the one and a magnetic pole tooth of the second stage of the magnetic pole dentition provided on the other are alternately arranged against the moving direction of the needle, and the linear motor on which the needle is arranged between the one and other first stage magnetic pole dentition and the second stage magnetic pole dentition provided on the one and the other is used. |
