JPS649423U - - Google Patents
Info
- Publication number
- JPS649423U JPS649423U JP10342587U JP10342587U JPS649423U JP S649423 U JPS649423 U JP S649423U JP 10342587 U JP10342587 U JP 10342587U JP 10342587 U JP10342587 U JP 10342587U JP S649423 U JPS649423 U JP S649423U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- absolute value
- synchronous motor
- value
- inputs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Protection Of Generators And Motors (AREA)
Description
第１図はこの考案に係る同期電動機の制御回路
のブロツク図、第２図は第１図に示した回路ブロ
ツクの主要部の波形を示す説明図、第３図は従来
の同期電動機の制御回路のブロツク図を示す。
図において、４はクランプ値設定器、５は電流
指令値クランプ回路、９は電流検出器、１０は同
期電動機、１は過電流保護回路、１２は整流回路
、１３は比較回路、１４は保護警報回路、１６は
絶対値回路を示す。なお、図中、同一符号は同一
又は相当部分を示す。
Figure 1 is a block diagram of a control circuit for a synchronous motor according to this invention, Figure 2 is an explanatory diagram showing waveforms of the main parts of the circuit block shown in Figure 1, and Figure 3 is a conventional control circuit for a synchronous motor. The block diagram is shown below. In the figure, 4 is a clamp value setter, 5 is a current command value clamp circuit, 9 is a current detector, 10 is a synchronous motor, 1 is an overcurrent protection circuit, 12 is a rectifier circuit, 13 is a comparison circuit, and 14 is a protection alarm. The circuit 16 indicates an absolute value circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
流回路と、電流指令値を所定の上限値でクランプ
する電流指令値クランプ回路の出力信号を入力し
てその絶対値を出力する絶対値回路と、この絶対
値回路および上記整流回路の出力信号を入力して
その大小を比較する比較回路と、この比較回路の
出力信号により作動する保護警報回路を備えたこ
とを特徴とする同期電動機の過電流保護回路。 A rectifier circuit that rectifies the detection current of the input current of the synchronous motor, an absolute value circuit that inputs the output signal of the current command value clamp circuit that clamps the current command value at a predetermined upper limit value, and outputs its absolute value; An overcurrent protection circuit for a synchronous motor, comprising a comparison circuit that inputs the output signals of the absolute value circuit and the rectifier circuit and compares the magnitude thereof, and a protection alarm circuit that is activated by the output signal of the comparison circuit. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10342587U JPS649423U (en) | 1987-07-06 | 1987-07-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10342587U JPS649423U (en) | 1987-07-06 | 1987-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS649423U true JPS649423U (en) | 1989-01-19 |
Family
ID=31334245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10342587U Pending JPS649423U (en) | 1987-07-06 | 1987-07-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS649423U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8648995B2 (en) | 1999-12-28 | 2014-02-11 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
-
1987
- 1987-07-06 JP JP10342587U patent/JPS649423U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8648995B2 (en) | 1999-12-28 | 2014-02-11 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and manufacturing method thereof |
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