JPS5925998U

JPS5925998U - Electric motor speed control device

Info

Publication number: JPS5925998U
Application number: JP1982120090U
Authority: JP
Inventors: 吉岡　包晴; 瀬里　力
Original assignee: 松下電器産業株式会社
Priority date: 1982-08-07
Filing date: 1982-08-07
Publication date: 1984-02-17

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) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は電動機の速度制御装置のブロック図、第２図は
従来の速度制御装置における速度切替回路の回路図、第
３図は同単安定マルチバイブレータにおける出力パルス
幅とスレシュホールド電圧の関係を示す図、第４図は本
考案の実施例にかかる速度切替回路の回路図、第５図は
同単安定マルチバイブレータにおける出力パルス幅吉ス
レシュホールド電圧の関係を示す図である。１・・・モニタ、４・・・トリガ発生回路、５・・・単
安定マルチバイブレーク、９・・・駆動回路、１０・・
・速度切替回路、Ｒ１〜Ｒｒ・・・固定抵抗器、８１〜
Ｓｒ・・・スイッチ、Ｃ・・・コンデンサ、ＶＦ６・・
・可変抵抗器、Ｖ、。・・・電源。ｌｗ　　　ＩＷ °　　　　→Ｔ第４図Figure 1 is a block diagram of a motor speed control device, Figure 2 is a circuit diagram of a speed switching circuit in a conventional speed control device, and Figure 3 shows the relationship between output pulse width and threshold voltage in the same monostable multivibrator. 4 is a circuit diagram of a speed switching circuit according to an embodiment of the present invention, and FIG. 5 is a diagram showing the relationship between output pulse width and threshold voltage in the same monostable multivibrator. DESCRIPTION OF SYMBOLS 1... Monitor, 4... Trigger generation circuit, 5... Monostable multi-bi break, 9... Drive circuit, 10...
・Speed switching circuit, R1~Rr...Fixed resistor, 81~
Sr...Switch, C...Capacitor, VF6...
・Variable resistor, V. ···power supply. lw IW ° →T Figure 4

Claims

[Scope of utility model registration request]

A trigger generation circuit that generates a trigger pulse with a period corresponding to the speed of the motor, and a constant time constant circuit that is connected to the output side of this trigger generation circuit and that is determined by a time constant circuit made of a resistor and a capacitor after receiving the trigger pulse. A monostable multivibrator that outputs a signal having a pulse width, a drive circuit that controls energization of a motor based on the signal from the monostable multivibrator, and a speed for selecting the output pulse width of the monostable multivibrator. a switching circuit, and the speed switching circuit includes a capacitor that constitutes the time constant circuit, and a plurality of parallel-connected fixed resistors that determine the output pulse width of the monostable multivibrator; Consisting of a plurality of switches connected between the capacitor and selectively switching the resistor, and a variable resistor connected between the resistor and a power source for adjusting the output pulse width of the monostable multivibrator. A speed control device for electric motors.