JPS59173488U

JPS59173488U - Induction motor starting device

Info

Publication number: JPS59173488U
Application number: JP6525683U
Authority: JP
Inventors: 誠瀬戸
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 1983-04-30
Filing date: 1983-04-30
Publication date: 1984-11-20

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図は従来の起動装置のブロック図、第２図はこの考
案の一実施例による起動装置のブロック図、第３図は第
２図の装置における切換動作時の各部の状態を示すタイ
ミングチャートを示す図である。１・・・可制御整流器、２・・・電圧コントローラ、７
・・・を流コントローラ、１０・・・インバータ、１１
・・・電圧・周波数変換器、１４・・・周波数制御回路
、１５・・・誘導電動機、４１・・・出力変圧器、４２
・・・電流検出器、４３．４４・・・位相検出器、４５
・・・位相　　。差検出器、４６・・・有効電力検出器、４７．４８・・
・電圧検出器、４９・・・電圧差検出器、５０．・・・
無効電力検出器、５１．５２・・・制御器。なお、図中
同一符号は同−又は相当部分を示す。第１図第３図Fig. 1 is a block diagram of a conventional starting device, Fig. 2 is a block diagram of a starting device according to an embodiment of this invention, and Fig. 3 is a timing chart showing the state of each part during switching operation in the device of Fig. 2. FIG. 1... Controllable rectifier, 2... Voltage controller, 7
. . . Flow controller, 10 . . . Inverter, 11
... Voltage/frequency converter, 14... Frequency control circuit, 15... Induction motor, 41... Output transformer, 42
... Current detector, 43.44 ... Phase detector, 45
...Phase. Difference detector, 46... Active power detector, 47.48...
- Voltage detector, 49... Voltage difference detector, 50. ...
Reactive power detector, 51.52...controller. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Figure 3

Claims

[Scope of utility model registration request]

a controllable rectifier that converts the AC voltage of the AC bus into DC; an impark that converts the DC output voltage of the controllable rectifier to AC; a voltage control circuit that controls the output voltage of the controllable rectifier to a set value; A converter equipped with a frequency control circuit for controlling the output frequency of the control rectifier to a set value, and a voltage difference between the detected voltage value of the AC bus and the output voltage value of the inverter at the time of current switching to the voltage control circuit. In addition, a voltage controller that matches the output voltage value of the converter with the voltage value of the AC bus, and a voltage controller that adjusts the phase difference between the detected phase of the AC bus and the phase of the output voltage of the inverter at the time of power switching to the frequency In addition to the control circuit, there is also a phase controller that matches the phase of the output voltage of the inverter with the phase of the voltage of the AC bus, and detects active power and reactive power supplied from the inverter to the induction motor after power supply starts. an active power detector and a reactive power detector; an active power controller that adds the active power value detected by the active power detector to the frequency control circuit to make the active power zero; and the reactive power detector; A starting device for an induction motor, comprising: a reactive power controller that adds a detected reactive power value to the voltage control circuit to reduce the reactive power to zero.