JPS6254580U

JPS6254580U -

Info

Publication number: JPS6254580U
Application number: JP14621585U
Authority: JP
Priority date: 1985-09-24
Filing date: 1985-09-24
Publication date: 1987-04-04

Description

[Brief explanation of the drawing]

第１図は本考案によるブラシレスモータの断面
図、第２図はブラシレスモータ検知機構の主要部
を示す分解斜視図、第３図はリードとロータマグ
ネツトの駆動用着磁部との対向状態を示す部分平
面図、第４図は他の実施例による検知機構の検出
用基板を示す平面図、第５図は従来のブラシレス
モータを示す断面図、第６図はそのコイル取り付
け部分を示す平面図、第７図は従来の検出用基板
を示す平面図、第８図はロータマグネツトの平面
図、第９図はロータマグネツトと従来の回転数検
出用パターンを示す拡大平面図、第１０図は従来
のブラシレスモータの回転数検出パルスを示す説
明図、第１１図は本考案によるブラシレスモータ
の回転数検出パルスを示す説明図である。５……ロータマグネツト、５ａ……回転駆動用
の主着磁部、５ｂ……回転数検出用のＦＧ着磁部
、８……ステータコイル、２１……固定板、２２
……コイル基板、２３……検出用基板、２６……
回転数検出用パターン、２５ａ，２５ｂ……回転
数検出用パターンのリード、Ａ……リードの交叉
部。 Fig. 1 is a sectional view of the brushless motor according to the present invention, Fig. 2 is an exploded perspective view showing the main parts of the brushless motor detection mechanism, and Fig. 3 shows the opposing state of the leads and the magnetized part for driving the rotor magnet. FIG. 4 is a plan view showing a detection board of a detection mechanism according to another embodiment, FIG. 5 is a sectional view showing a conventional brushless motor, and FIG. 6 is a plan view showing a coil attachment part thereof. , FIG. 7 is a plan view showing a conventional detection substrate, FIG. 8 is a plan view of a rotor magnet, FIG. 9 is an enlarged plan view showing a rotor magnet and a conventional rotation speed detection pattern, and FIG. 10 is a plan view showing a conventional detection substrate. 11 is an explanatory diagram showing the rotation speed detection pulse of a conventional brushless motor, and FIG. 11 is an explanatory diagram showing the rotation speed detection pulse of the brushless motor according to the present invention. 5... Rotor magnet, 5a... Main magnetized part for rotational drive, 5b... FG magnetized part for rotation speed detection, 8... Stator coil, 21... Fixed plate, 22
...Coil board, 23...Detection board, 26...
Pattern for rotational speed detection, 25a, 25b... Leads of pattern for rotational speed detection, A... Intersection of leads.

Claims

[Claims for Utility Model Registration] (1) A magnetized part for rotational drive in which N poles and S poles are arranged alternately in the direction of rotation, and an N pole with a smaller pitch than the magnetized part for rotational drive. A rotor magnet having a magnetized part for rotation speed detection in which poles and S poles are arranged alternately is supported rotatably, and a magnet for rotational driving of the rotor magnet is supported on the fixed side. A stator coil through which a current flows in the radial direction of the rotor magnet faces the magnetized part of the rotor magnet, and a detection board having a pattern facing the magnetized part for detecting the number of rotations is provided. In a brushless motor detection mechanism, a pair of leads connected to the pattern pass through the magnetized part for rotating the rotor magnet and extend to the outside, and are connected to the pattern on the detection board. A detection mechanism for a brushless motor, characterized in that a pair of leads cross each other on the drive magnetized part and extend to the outside. (2) The pair of leads are formed of a wire rod, and the leads are twisted above the driving magnetized part and extended to the outside.Claim 1 of the Utility Model Registration Claim
Detection mechanism of the brushless motor described in section. (3) The pair of leads are formed by a conductive pattern printed on the detection board, and this conductive pattern crosses over the drive magnetized part and extends to the outside.Registered as a utility model. A detection mechanism for a brushless motor according to claim 1.