JPS63194597U

JPS63194597U -

Info

Publication number: JPS63194597U
Application number: JP1987083716U
Authority: JP
Priority date: 1987-05-29
Filing date: 1987-05-29
Publication date: 1988-12-14

Description

[Brief explanation of the drawing]

第１図は本考案になる単相誘導電動機の速度制
御装置の一実施例を示す電気回路図、第２図は鋸
歯状波電圧と速度電圧との比較による制御位相角
の関係図、第３図は第２図の制御位相角に対応し
た実効値電圧の関係図、第４図は回転速度と第１
図、第２図に関連した各部の電圧の関係図、第５
図は第４図に対応した回転速度とトルクの関係図
を示すものである。図において、６はスイツチング素子、７は速度
検出器、８，１５，１７，１８，２０，２１，２
３は抵抗器、９は可変抵抗器、１０〜１２はダイ
オード、１４はコンデンサ、１６はツエナーダイ
オード、１９は増幅器、２２はランプジエネレー
タ、２４は比較器、２５はトリガパルス発生器、
２６はソフトスタート回路である。 FIG. 1 is an electric circuit diagram showing one embodiment of the speed control device for a single-phase induction motor according to the present invention, FIG. 2 is a relationship diagram of the control phase angle based on a comparison between the sawtooth wave voltage and the speed voltage, and FIG. The figure shows the relationship between the effective value voltage corresponding to the control phase angle in Figure 2, and Figure 4 shows the relationship between the rotational speed and the first
Figure 5. Voltage relationship diagram of each part related to Figure 2.
The figure shows a relationship diagram between rotational speed and torque corresponding to FIG. 4. In the figure, 6 is a switching element, 7 is a speed detector, 8, 15, 17, 18, 20, 21, 2
3 is a resistor, 9 is a variable resistor, 10 to 12 are diodes, 14 is a capacitor, 16 is a Zener diode, 19 is an amplifier, 22 is a lamp generator, 24 is a comparator, 25 is a trigger pulse generator,
26 is a soft start circuit.

Claims

[Scope of utility model registration request]

In a speed control device that connects a switching element in series to an electric motor, detects the rotation speed of the motor, and controls the rotation speed to a preset rotation speed, the output voltage of the speed detector attached to the motor rotor is divided into voltages. A shift circuit that level-shifts the voltage by a fixed voltage after rectification and smoothing via an adjustment circuit, an amplifier circuit that amplifies the voltage after dividing the output voltage of the shift circuit as necessary, and synchronized with the AC power supply. a lamp generator circuit that generates a sawtooth wave voltage, and a comparator that directly compares the output voltage of the amplifier circuit and the output voltage of the lamp generator and outputs a control phase angle signal; 1. A speed control device for a single-phase induction motor, characterized in that the switching element is ignited via a trigger pulse generation circuit in response to an output signal from a single-phase induction motor.