JPH0243434B2 - - Google Patents
Info
- Publication number
- JPH0243434B2 JPH0243434B2 JP846282A JP846282A JPH0243434B2 JP H0243434 B2 JPH0243434 B2 JP H0243434B2 JP 846282 A JP846282 A JP 846282A JP 846282 A JP846282 A JP 846282A JP H0243434 B2 JPH0243434 B2 JP H0243434B2
- Authority
- JP
- Japan
- Prior art keywords
- variable
- synchronous motor
- voltage
- main circuit
- braking
- 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.)
- Expired
Links
- 230000001360 synchronised effect Effects 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an ac motor by short-circuit or resistive braking
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stopping Of Electric Motors (AREA)
Description
【発明の詳細な説明】
この発明は、可変速運転される同期電動機の制
動方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for braking a synchronous motor operated at variable speed.
第１図に、同期電動機の広範囲速度制御を行う
為の従来装置のブロツク構成図を示す。図におい
て、１は商用周波数の交流電源、２は可変電圧可
変周波数電源（以下、VVVFインバータと云
う。）、３は主回路しや断器、４は同期電動機、５
は交流電動機の界磁巻線、６は界磁電源、７は制
御装置であつて、VVVFインバータ２の出力電
圧VINV、出力周波数ｆ、界磁電源６が出力する界
磁電圧Vf及び主回路しや断器３の投入・しや断
操作を制御する。 FIG. 1 shows a block diagram of a conventional device for controlling a synchronous motor over a wide range of speeds. In the figure, 1 is a commercial frequency AC power supply, 2 is a variable voltage variable frequency power supply (hereinafter referred to as a VVVF inverter), 3 is a main circuit disconnector, 4 is a synchronous motor, and 5
is the field winding of the AC motor, 6 is the field power source, and 7 is the control device, which includes the output voltage V INV of the VVVF inverter 2, the output frequency f, the field voltage Vf output by the field power source 6, and the main circuit. Controls the closing and cutting operations of the shredder breaker 3.
同期電動機の広範囲可変速運転を行う為のこの
種の装置では、運転周波数域が低周波数域まで広
がる場合がある為、主回路しや断器３の接点保護
の上から、従来は、該主回路しや断器３を単に開
閉器として使用し、同期電動機４の制動には回生
制動を行う構成となつていた。この為、上記従来
装置では運転中に主回路を開閉することができな
いという欠点があつた。 In this type of device for wide-range variable speed operation of a synchronous motor, the operating frequency range may extend to a low frequency range. The circuit breaker 3 is simply used as a switch, and the synchronous motor 4 is braked by regenerative braking. For this reason, the conventional device described above has the disadvantage that the main circuit cannot be opened or closed during operation.
この発明は、上記した従来のものの欠点を除去
する為になされたもので、VVVFインバータの
出力電圧を同期電動機の逆起電圧まで下げて主回
路を開き以後発電制動する構成として主回路の零
電流しや断を可能にすることにより、主回路しや
断器の接点寿命を縮めることなく主回路を開くこ
とができる可変速運転同期電動機の制動方法を提
供することを目的とする。 This invention was made in order to eliminate the drawbacks of the above-mentioned conventional ones, and the main circuit is opened by lowering the output voltage of the VVVF inverter to the back electromotive voltage of the synchronous motor, and then dynamic braking is performed. It is an object of the present invention to provide a braking method for a variable-speed operating synchronous motor that can open the main circuit without shortening the contact life of the main circuit breaker by enabling the breaker to open the main circuit.
以下、この発明の一実施例を図について説明す
る。 An embodiment of the present invention will be described below with reference to the drawings.
第２図において８は発電制動用の抵抗器群であ
つて、開閉装置９を介して同期電動機４の回転子
巻線に接続され、該開閉装置９は交流電動機４の
運転・制動開始に際して制御装置１０から夫々開
及び閉指令を受けて開閉する。１１は位相検出装
置であつて、VVVFインバータ２の出力電圧
VINVと同期電動機４の逆起電圧Vemfの位相差δ
を検出する為に設けられており、その出力は制御
装置１０に入力される。この制御装置１０は、前
記した制御装置７が具える機能の他、同期電動機
４の停止を行うに当つて、VVVFインバータ２
の出力電圧VINVを同期電動機４の逆起電圧Vemf
まで下げる為の制御指令をVVVFインバータ２
に供給し、VINV＝Vemfまで出力電圧VINVが低下
した後に主回路しや断器３と開閉装置９に夫々し
や断指令と開指令を出力すると共に出力電圧VINV
の下げ巾ΔV＝VINV−Vemfを位相差δに基いて
決定する機能が附加されている。なお、出力電圧
と逆起電圧とは、回生モード時における電源２へ
の電圧指令と実際の出力電圧値にて区別する。 In FIG. 2, reference numeral 8 denotes a group of resistors for dynamic braking, which are connected to the rotor winding of the synchronous motor 4 via a switchgear 9, and the switchgear 9 controls when the AC motor 4 starts operating and braking. They open and close upon receiving open and close commands from the device 10, respectively. 11 is a phase detection device, which detects the output voltage of VVVF inverter 2;
Phase difference δ between V INV and back electromotive force Vemf of synchronous motor 4
The output is input to the control device 10. In addition to the functions provided by the control device 7 described above, this control device 10 also controls the VVVF inverter 2 when stopping the synchronous motor 4.
The output voltage V INV is the back electromotive force Vemf of the synchronous motor 4
VVVF inverter 2 sends a control command to lower the
After the output voltage V INV decreases to V INV = Vemf, the output voltage V INV is output to the main circuit shield breaker 3 and the switchgear 9 respectively, and the output voltage V INV is
A function is added to determine the drop width ΔV=V INV −Vemf based on the phase difference δ. Note that the output voltage and the back electromotive voltage are distinguished by the voltage command to the power source 2 in the regeneration mode and the actual output voltage value.
ところで、回生動作に移行する前の電圧指令
は、逆起電圧より高い電圧となつている。 By the way, the voltage command before shifting to the regenerative operation is higher than the back electromotive voltage.
即ち、電源電圧とは、電源装置に与える基準電
圧指令とし、逆起電圧は、実際の出力電圧値とす
る。力行時は式より明らかなように可変電圧可
変周波数電源２は同期電動機へ電力を供給してい
るのでケーブルドロツプ分、及び電機子抵抗ドロ
ツプ分の影響により逆起電圧よりも基準電圧指令
の方が高くなる。 That is, the power supply voltage is a reference voltage command given to the power supply device, and the back electromotive force is an actual output voltage value. During power running, as is clear from the formula, the variable voltage variable frequency power supply 2 is supplying power to the synchronous motor, so the reference voltage command is higher than the back electromotive force due to the effects of cable drop and armature resistance drop. Become.
Ｖ＝Ｅ＋Ia（Ra＋Rc） ……
但し Ｖ＝可変電圧可変周波数電源２の出力
Ｅ＝逆起電圧
Ia＝主回路電流
Ra＝電機子抵抗
Rc＝ケーブルの抵抗
そして回生モードに切り替えた状態で基準電圧
指令を下げ、主回路電流が零になつた時点を検出
した時に主回路を開く。電流Ia＝０の時点は、Ｖ
＝Ｅであることが式よりわかる。そこで主回路
電流の検出は「三菱電機技報 Vol.55No.11・
1981」第65ページ図９に示されているように可変
電圧可変周波数電源２において行われている。 V = E + Ia (Ra + Rc) ... However, V = Output of variable voltage variable frequency power supply 2 E = Back electromotive voltage Ia = Main circuit current Ra = Armature resistance Rc = Cable resistance And, when switched to regeneration mode, reference voltage command The main circuit is opened when the main circuit current reaches zero. At the time of current Ia = 0, V
It can be seen from the formula that =E. Therefore, the detection of the main circuit current is
1981, page 65, in a variable voltage variable frequency power supply 2 as shown in FIG.
この方法では、出力電圧VINV＝逆起電圧Vemf
になると主回路に電流は流れなくなるので、実施
例の装置では、主回路しや断器３が常に主回路電
流零状態で引外され、その後に発電制動が行われ
る。 In this method, the output voltage V INV = back electromotive force Vemf
When this happens, no current will flow through the main circuit, so in the device of the embodiment, the main circuit circuit breaker 3 is always tripped in a state where the main circuit current is zero, and then dynamic braking is performed.
なお、上記下げ巾ΔVは位相差δが大きい場合
には大きくなり、小さい時は小さくなる。 Note that the lowering width ΔV increases when the phase difference δ is large, and decreases when the phase difference δ is small.
以上の如く、この発明によれば、可変電圧可変
周波数電源の出力電圧を同期電動機の逆起電圧ま
で下げた後主回路しや断器を開いて発電制動を行
う構成としたことにより、主回路のしや断が単に
零電流しや断となるので、主回路しや断器接点の
寿命を縮めることなく運転中に主回路を開いて交
流電動機の制動を行うことができる。 As described above, according to the present invention, after the output voltage of the variable voltage variable frequency power supply is lowered to the back electromotive voltage of the synchronous motor, the main circuit is opened and the disconnector is opened to perform dynamic braking. Since the opening and disconnection are simply zero current and interruption, the AC motor can be braked by opening the main circuit during operation without shortening the life of the main circuit or breaker contacts.
第１図は、可変速運転同期電動機の従来の制動
方法を説明する為のブロツク図、第２図は、この
発明による可変速運転同期電動機の制動方法を実
施した可変速運転同期電動機装置のブロツク図で
ある。
図において、２……可変電圧可変周波数電源、
３……主回路しや断器、４……同期電動機、６…
…界磁電源、８……抵抗器群、９……開閉装置、
１０……制御装置、１１……位相検出装置。な
お、図中、同一符号は同一又は相当する部分を示
す。
FIG. 1 is a block diagram for explaining a conventional braking method for a variable speed synchronous motor, and FIG. 2 is a block diagram of a variable speed synchronous motor device that implements the braking method for a variable speed synchronous motor according to the present invention. It is a diagram. In the figure, 2... variable voltage variable frequency power supply,
3...Main circuit disconnector, 4...Synchronous motor, 6...
...Field power supply, 8...Resistor group, 9...Switching device,
10...control device, 11...phase detection device. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
されている同期電動機の制動を行うにあたり、上
記可変電圧可変周波数電源の出力電圧を下げ、主
回路電流が零になつたことを検出した後、主回路
を開いて発電制御を行うことを特徴とする可変速
運転同期電動機の制動方法。1. When braking a synchronous motor operated at variable speed using a variable voltage variable frequency power source, the output voltage of the variable voltage variable frequency power source is lowered, and after detecting that the main circuit current has become zero, A method for braking a variable-speed operating synchronous motor characterized by controlling power generation by opening a circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP846282A JPS58127581A (en) | 1982-01-21 | 1982-01-21 | Braking method for variable speed ac motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP846282A JPS58127581A (en) | 1982-01-21 | 1982-01-21 | Braking method for variable speed ac motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58127581A JPS58127581A (en) | 1983-07-29 |
| JPH0243434B2 true JPH0243434B2 (en) | 1990-09-28 |
Family
ID=11693792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP846282A Granted JPS58127581A (en) | 1982-01-21 | 1982-01-21 | Braking method for variable speed ac motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58127581A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4708310B2 (en) * | 2006-06-19 | 2011-06-22 | 三菱電機株式会社 | Circuit breaker |
-
1982
- 1982-01-21 JP JP846282A patent/JPS58127581A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58127581A (en) | 1983-07-29 |
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