JPH02104776U

JPH02104776U -

Info

Publication number: JPH02104776U
Application number: JP1053989U
Authority: JP
Priority date: 1989-01-31
Filing date: 1989-01-31
Publication date: 1990-08-21

Description

[Brief explanation of drawings]

第１図は、本考案の周波数発電機を備えたブラ
シレスモータの第１の実施例であるテープレコー
ダのリール駆動用モータの例を示すブロツク図、
第２図は第１図の回路動作を説明する波形図、第
３図は第１図及び第４図のモータの側面断面図、
第４図は本考案の周波数発電機を備えたブラシレ
スモータの第２の実施例であるテープレコーダの
リール駆動用モータの例を示すブロツク図、第５
図は第４図の回路動作を説明する波形図、第６図
は従来のテープレコーダのリール駆動用モータの
第１の例を示す側面断面図、第７図は第６図のモ
ータのブロツク図、第８図は従来のテープレコー
ダのリール駆動用モータの第２の例を示すブロツ
ク図である。１，２１，３１，４１……テープレコーダのリ
ール駆動用モータ（ブラシレスモータ）、２……
ステータ、４……駆動用コイル、５，５―１，５
―２，５―３……ホール素子（駆動用磁極位置検
出手段）、７，３７……ロータ、９……ロータマ
グネツト、９ａ……駆動用磁極、１１……ブラシ
レスモータ駆動回路、１２―１，１２―２，３２
，４２……周波数発電機（ＦＧ）、１３ａ，１３
ｂ，１３ｃ，１３ｄ……波形処理回路（波形整形
手段）、１４―１，１４―２，１４―３……電圧
比較器（電圧比較手段）、１５―１，１５―２，
１５―３……基準電圧発生器（基準電圧発生手段
）、Ｒ_１，Ｒ_２，Ｒ_３……抵抗器、ＥＳ_１，ＥＳ
_２，ＥＳ_３……基準電圧。 FIG. 1 is a block diagram showing an example of a reel driving motor for a tape recorder, which is a first embodiment of a brushless motor equipped with a frequency generator of the present invention;
2 is a waveform diagram explaining the circuit operation of FIG. 1, FIG. 3 is a side sectional view of the motor of FIGS. 1 and 4,
FIG. 4 is a block diagram showing an example of a reel driving motor for a tape recorder, which is a second embodiment of the brushless motor equipped with the frequency generator of the present invention.
4 is a waveform diagram explaining the circuit operation of FIG. 4, FIG. 6 is a side sectional view showing a first example of a conventional tape recorder reel drive motor, and FIG. 7 is a block diagram of the motor of FIG. 6. FIG. 8 is a block diagram showing a second example of a conventional reel drive motor for a tape recorder. 1, 21, 31, 41... Tape recorder reel drive motor (brushless motor), 2...
Stator, 4... Drive coil, 5, 5-1, 5
-2,5-3...Hall element (drive magnetic pole position detection means), 7,37...rotor, 9...rotor magnet, 9a...drive magnetic pole, 11...brushless motor drive circuit, 12- 1,12-2,32
, 42... Frequency generator (FG), 13a, 13
b, 13c, 13d... Waveform processing circuit (waveform shaping means), 14-1, 14-2, 14-3... Voltage comparator (voltage comparison means), 15-1, 15-2,
15-3...Reference voltage generator (reference voltage generation means), _R1 , _R2 , _R3 ...Resistor, _ES1 , ES
₂ , _ES3 ...Reference voltage.

Claims

[Scope of utility model registration request]

A rotor having a rotor magnet with driving magnetic poles formed thereon, a multi-phase driving coil, and a driving magnetic pole position detection signal having a phase difference corresponding to the multiple phases according to the position of the driving magnetic poles are output respectively. a stator having a plurality of drive magnetic pole position detection means; and a brushless motor that rotationally drives the rotor by switching drive currents to the plurality of phase drive coils based on the plurality of drive magnetic pole position detection signals. In a brushless motor equipped with a motor drive circuit and a frequency generator that outputs a rectangular wave rotation speed detection signal with a frequency proportional to the rotation speed of the rotor based on the drive magnetic pole position detection signal, two or more of these A waveform shaping means for shaping each drive magnetic pole position detection signal into a rectangular wave; a group of resistors having one end connected in common and the other end connected to an output terminal of each of the waveform shaping means; and this resistor group. A brushless motor comprising a frequency generator having voltage comparison means for outputting the rotational speed detection signal according to the voltage of the common connection terminal of the motor and the reference voltage from the reference voltage generation means.