JPS5956997U

JPS5956997U - DC motor speed control circuit

Info

Publication number: JPS5956997U
Application number: JP1982151179U
Authority: JP
Inventors: 吉沢　輝久; 晃中村; 操古谷
Original assignee: ミツミ電機株式会社
Priority date: 1982-10-05
Filing date: 1982-10-05
Publication date: 1984-04-13

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 drawings]

第１図は従来例の速度制御回路図、第２図は本考案の一
実施例になる速度制御回路、第３図は第１図に示す速度
制御回路の負荷トルク特性、第４図は第２図に示す速度
制御回路の負荷トルク特性を夫々示す。　　　゛１〜５・・・ＩＣ外部導出端子、６・・・ＩＣ，７・・
・誤差検出回路、８・・・基準電圧源、Ｍ・・・直流モ
ータ、Ｅｇ・・・逆起電圧、Ｒｇ・・・内部抵抗、Ｑｌ
・・・分流トランジスタ、Ｑ２・・・駆動トランジスタ
、Ｒｔ、　Ｒａ、　Ｒｂ。Ｒ，、ＲＡ、　Ｒｔ３・・・抵抗、Ｉａ・・・負荷電流
、昂・・・分流電流。Fig. 1 is a speed control circuit diagram of a conventional example, Fig. 2 is a speed control circuit according to an embodiment of the present invention, Fig. 3 is a load torque characteristic of the speed control circuit shown in Fig. 1, and Fig. 4 is a diagram of a speed control circuit according to an embodiment of the present invention. 2 shows the load torque characteristics of the speed control circuit shown in FIG.゛1~5...IC external lead-out terminal, 6...IC, 7...
・Error detection circuit, 8... Reference voltage source, M... DC motor, Eg... Back electromotive force, Rg... Internal resistance, Ql
...Shunt transistor, Q2...Drive transistor, Rt, Ra, Rb. R,, RA, Rt3...resistance, Ia...load current, 昂...shunt current.

Claims

[Scope of utility model registration request]

A reference voltage source is provided between the lines between the first and second terminals and two input terminals of the error detection circuit corresponding to each terminal, and a third
A drive transistor is connected between the terminal of and a voltage corresponding to the voltage generated between the power supply terminal and the third terminal is applied to the second terminal. a DC motor control IC configured to detect the voltage and the reference voltage by the error detection circuit, and add the output signal of the error detection circuit to the control input of the shunt and drive transistor; A DC motor is connected between the power supply terminal and the third terminal, a resistor is connected between the power supply terminal and the first terminal, a voltage dividing circuit is connected between the power supply terminal and the third terminal, A speed control circuit for a DC motor, characterized in that the voltage is controlled so that the sum of the voltage at the voltage dividing point and the voltage at the resistor is equal to the reference voltage.