JPS60117695U

JPS60117695U - Brushless motor drive circuit

Info

Publication number: JPS60117695U
Application number: JP1984005545U
Authority: JP
Inventors: 英美佐々木
Original assignee: オリンパス光学工業株式会社
Priority date: 1984-01-18
Filing date: 1984-01-18
Publication date: 1985-08-08

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の駆動回路を適用する対象となるブラシ
レスモータの例を示す平面断面図、第２図は第１図のブ
ラシレスモータにおけるコイル群の配置と駆動力発生用
のマグネット群の配置及びその着磁状況を示す概念図、
第３図は本考案の一実施例としてのブラシレスモータの
駆動回路を示す回路図、第４図は第３図の回路中におけ
る制御回路及び検出回路の構成例を示すブロック図、第
５図は本考案の他の実施例を示す回路図、第６図は第５
図の回路を適用するブラシレスモータの例を示す概念図
である。２０．２１，２２，２３・・・コイル、２４．２５・・
・ホール素子、２６，２７，２８，２９・・・ＡＮＤ回
路、３０，３１，３２，３３・・・トランジスタ、３４
．３５．３６，３７・・・トランジスタ、Ｓｌ。Ｓ２．Ｓ３．Ｓ４・・・切換えスイッチ、３８・・・制
御回路、３９・・・電源端子、４０・・・ソレノイド、
４１・・・トランジスタ、４２・・・弁別回路。９　　　　１０　　　２７８　　　　　　　　　１Ｒ１
４ｄ　　　２３ト汗　＋−ＲＩＲ３」　　仝５１Ｊ、　　　　　　　　Ａ、４１ｒＡ２　　　　ｒｎ４　　ｒｒ１５ｍ６Ｓｌｌ　
５１２　　　５１３　ＳＪ４へ３Ｏ−３Ｉｆ３１４ａ −Ｊ　！１　　　：Ｍ４　１４ｄFigure 1 is a plan cross-sectional view showing an example of a brushless motor to which the drive circuit of the present invention is applied, and Figure 2 is the arrangement of coil groups and the arrangement of magnet groups for generating driving force in the brushless motor of Figure 1. and a conceptual diagram showing its magnetization status,
FIG. 3 is a circuit diagram showing a brushless motor drive circuit as an embodiment of the present invention, FIG. 4 is a block diagram showing an example of the configuration of a control circuit and a detection circuit in the circuit of FIG. 3, and FIG. A circuit diagram showing another embodiment of the present invention, FIG.
FIG. 2 is a conceptual diagram showing an example of a brushless motor to which the circuit shown in the figure is applied. 20.21, 22, 23...Coil, 24.25...
・Hall element, 26, 27, 28, 29...AND circuit, 30, 31, 32, 33...transistor, 34
．． 35.36,37...Transistor, Sl. S2. S3. S4... Changeover switch, 38... Control circuit, 39... Power terminal, 40... Solenoid,
41...Transistor, 42...Discrimination circuit. 9 10 278 1R1
4d 23 To sweat +-RIR3” 51 J, A, 41rA2 rn4 rr15m6Sll
512 513 SJ4 to 3O-3If 314a -J! 1: M4 14d

Claims

[Scope of utility model registration request]

The brushless motor has a position detecting means for detecting the rotational position of the rotor of the brushless motor, and a switching means for performing a switching operation in response to an output signal of the position detecting means, and the switching means supplies the drive current from the power source to the brushless motor in M fixed order. In a brushless motor drive circuit configured to distribute supply to a plurality of coils of a motor to rotationally drive the brushless motor, the drive circuit further determines whether the rotational speed of the brushless motor has reached a predetermined speed. It operates based on the output signal of the speed discrimination means and the speed discrimination means, and when the rotational speed of the brushless motor is below a predetermined value, a predetermined number of the plurality of coils are connected in series to the power source so that the rotational speed becomes a predetermined value. 1. A drive circuit for a brushless motor, characterized in that a connection switching means is configured to connect the coil in parallel to a power source when the value exceeds the value.