JPH02103782U

JPH02103782U -

Info

Publication number: JPH02103782U
Application number: JP1989007784U
Authority: JP
Priority date: 1989-01-26
Filing date: 1989-01-26
Publication date: 1990-08-17

Description

[Brief explanation of drawings]

第１図乃至第６図は本考案の第１実施例に係り
、第１図はブラシレス直流モータを燃料ポンプに
適用した場合の燃料ポンプの縦断面図、第２図は
第１図の要部拡大断面図、第３図は第２図中の弾
性板の平面図、第４図はブラシレス直流モータの
回路構成図、第５図は動作を説明する第２図と同
様の要部拡大断面図、第６図はホール素子から出
力される検出電圧の波形図、第７図は本考案の第
２実施例を示す第２図と同様の要部拡大断面図、
第８図及び第９図は先行技術に係り、第８図はブ
ラシレス直流モータを燃料ポンプに適用した場合
を示す該燃料ポンプの縦断面図、第９図はブラシ
レス直流モータの回路構成図である。１……ケーシング、１４……回転軸、１５……
マグネツトロータ、１６〜１８……励磁コイル、
２７……駆動回路、４２……弾性板、４６〜４９
，６１〜６４……検出用マグネツト、５２〜５４
……エンコーダ、５５〜５７……ホール素子。 1 to 6 relate to the first embodiment of the present invention, FIG. 1 is a longitudinal sectional view of a fuel pump in which a brushless DC motor is applied to the fuel pump, and FIG. 2 is the main part of FIG. 1. FIG. 3 is a plan view of the elastic plate in FIG. 2, FIG. 4 is a circuit configuration diagram of the brushless DC motor, and FIG. 5 is an enlarged sectional view of the main parts similar to FIG. 2 to explain the operation. , FIG. 6 is a waveform diagram of the detection voltage output from the Hall element, FIG. 7 is an enlarged sectional view of the main part similar to FIG. 2 showing the second embodiment of the present invention,
8 and 9 relate to the prior art, FIG. 8 is a vertical cross-sectional view of a fuel pump showing a case where a brushless DC motor is applied to the fuel pump, and FIG. 9 is a circuit configuration diagram of the brushless DC motor. . 1... Casing, 14... Rotating shaft, 15...
Magnetic rotor, 16-18...excitation coil,
27... Drive circuit, 42... Elastic plate, 46-49
, 61-64...detection magnet, 52-54
... Encoder, 55-57 ... Hall element.

Claims

[Scope of utility model registration request]

A casing, a rotating shaft rotatably provided on the casing, a magnet rotor provided on the rotating shaft, and a plurality of excitation coils located on the outer peripheral side of the magnet rotor and provided on the casing. , one or more detection magnets that are provided on the rotating shaft and whose positions change depending on the magnitude of centrifugal force due to rotation; and one or more detection magnets that are provided on the casing and output a detection voltage according to the position of the detection magnets. A brushless DC motor comprising a Hall element and a drive circuit that controls energization of the excitation coil based on a detected voltage from the Hall element.