| 摘要 |
PURPOSE:To prevent the malfunction of a speed detecting element by fitting and fixing a cylindrical magnetic shielding plate in the circumferential groove of a ring insulating plate provided on the end faces of a stator core. CONSTITUTION:Insulating plates 3 and 8 are provided on both end faces of a cylindrical stator core 1 surrounding a rotor 5, and a printed plate 7 is immovably installed on the inside face of a motor axially opposed to one insulating plate 3. Also, a cylindrical magnetic shielding plate 4 is fitted and fixed in said insulating plate 3. On the inside of said magnetic shielding plate 4, a rotational speed detecting element 6 connected with the said printed plate 7 and immovably supported by said shielding plate 4 is arranged radially in opposition to the end outer periphery of said rotor 5. In this manner, said rotational speed detecting element 6 for the rotor 5 is arranged on the inside of a coil end 2a protruding from the end face of said iron core 1, via the cylindrical magnetic shielding plate 4 fitted and fixed in the insulating plate 3, to enable prevention of the malfunction of said rotational speed detecting element 6 and improvement in assembling properties of an apparatus. |
