JPH0312074Y2 - - Google Patents
Info
- Publication number
- JPH0312074Y2 JPH0312074Y2 JP5125979U JP5125979U JPH0312074Y2 JP H0312074 Y2 JPH0312074 Y2 JP H0312074Y2 JP 5125979 U JP5125979 U JP 5125979U JP 5125979 U JP5125979 U JP 5125979U JP H0312074 Y2 JPH0312074 Y2 JP H0312074Y2
- Authority
- JP
- Japan
- Prior art keywords
- output
- motor
- power supply
- frequency
- current
- 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
- 230000007423 decrease Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
Landscapes
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Description
【考案の詳細な説明】
本考案は、交流電動機用電源装置の制御装置に
関し、電動機回転中での電源起動による過電流防
止ひいては電動機のインチング運転を可能とした
制御装置に関する。[Detailed Description of the Invention] The present invention relates to a control device for a power supply device for an AC motor, and more particularly, to a control device that prevents overcurrent by starting the power supply while the motor is rotating, and also enables inching operation of the motor.
誘導電動機など交流電動機をインバータなどの
電源装置で可変速制御する装置において、電動機
がその負荷も含めた慣性で回転している状態で電
源装置の運転を再開すると、電源の周波数と電動
機の回転数が合つていないときには電動機との間
に無効電流が流れ、過電流となる。この過電流を
防止するために、従来は第１図に示すように、電
動機１の回転数を検出器２で検出しておき、電源
装置３の運転再開に際してはその出力周波数指令
を検出器２の検出値に合わせ、この指令値から
徐々に所期の回転数まで増減する周波数調整をす
る。この制御手法では電動機１の回転数検出器を
必要とする。一方、従来の他の制御手法として
は、第２図に示すように、電動機１の発生する誘
起電圧を検出器４で検出し、この検出器４で検出
する電動機回転数に電源装置３の出力周波数を合
わせるものがある。この制御手法においては、電
動機１の誘起電圧は電源３から切離した直後には
切離直前の誘起電圧を使用することができるが、
切離し後の誘起電圧の減衰を抑えてその検出を可
能とするためには図示の如く電動機側線間にコン
デンサ５を設けておくか、又は電源の運転時に電
源から低電圧を供給して強制的に誘起電圧を発生
させておくことを必要とし、誘起電圧検出器４の
ほかに誘起電圧を発生させるための手段を必要と
するなど回路構成が複雑になる。 In a device that controls an AC motor such as an induction motor at variable speed using a power supply device such as an inverter, if the power supply device resumes operation while the motor is rotating with inertia including its load, the frequency of the power supply and the rotation speed of the motor will change. If they are not matched, reactive current will flow between the motor and the motor, resulting in an overcurrent. In order to prevent this overcurrent, conventionally, as shown in FIG. According to the detected value, the frequency is adjusted to gradually increase or decrease from this command value to the desired rotation speed. This control method requires a rotation speed detector for the electric motor 1. On the other hand, as shown in FIG. 2, as another conventional control method, the induced voltage generated by the electric motor 1 is detected by a detector 4, and the output of the power supply device 3 is adjusted to the motor rotation speed detected by the detector 4. There are things that match the frequency. In this control method, the induced voltage of the motor 1 immediately after disconnection from the power supply 3 can be used as the induced voltage immediately before disconnection.
In order to suppress the attenuation of the induced voltage after disconnection and enable its detection, a capacitor 5 should be installed between the motor side wires as shown in the figure, or a low voltage should be supplied from the power supply when the power supply is running. It is necessary to generate an induced voltage, and the circuit configuration becomes complicated, such as requiring means for generating the induced voltage in addition to the induced voltage detector 4.
本考案は、電動機電源装置の運転停止には電源
装置の出力周波数を徐々に（好ましくは電動機の
減速度に合わせた速度で）減少させ、電動機が低
回転数に達するに充分な時間経過後に電源装置を
運転停止することにより、従来手法の問題点を解
消した制御装置を提供することを目的とする。 In this invention, the output frequency of the power supply is gradually reduced (preferably at a speed matching the deceleration of the motor) to stop the operation of the motor power supply, and the power supply is turned on after a sufficient time has elapsed for the motor to reach a low rotational speed. It is an object of the present invention to provide a control device that solves the problems of conventional methods by shutting down the device.
第３図に本考案の回路例を示す。周波数増幅器
７は、周波数設定器６と反転増幅器９を通したイ
ンバータ周波数の誤差を増幅して次段の電流増巾
器８の入力信号となる。電流増巾器８は前記周波
数増巾器７と電動機１の有効電流検出器１０が検
出した有効電流との誤差を増巾して次段のインバ
ータ周波数、電圧設定となり、インバータ制御回
路１１へ入力する。このような回路構成に於いて
例えば周波数設定を急激に上昇した場合、電動機
には過大な電流が流れようとする。このとき、周
波数増巾器７の出力に図示しないリミツタをつけ
て、そのリミツタの値を−10V，＋1Vとし、電動
機１の駆動電流が100％のとき、有効電流検出器
１０の出力が＋10Vになるように調整しておく。
このようにすると過電流が流れようとすると電流
増巾器８の出力は、100％電流になるように動作
し、周波数と電圧の上昇を制限して、未然に過電
流となることを保護する。また、設定を急激に下
降させたときは、急激な回生電流が電動機からイ
ンバータ側へ流れ、直流電圧が上昇するが、前記
のリミツタにより電動機駆動電流の10％の電流で
徐々にインバータ周波数が下降し直流電圧の上昇
を防ぐ。ここで回生のリミツタを＋1V（10％）と
したが、この値は、インバータの損失に見合う値
が好ましい。また、インバータの直流電圧を可変
する装置や、交流電源へ回生できる装置では、そ
れらに見合つた値に設定する。 FIG. 3 shows an example of the circuit of the present invention. The frequency amplifier 7 amplifies the error in the inverter frequency passed through the frequency setter 6 and the inverting amplifier 9 to provide an input signal to the current amplifier 8 at the next stage. The current amplifier 8 amplifies the error between the frequency amplifier 7 and the active current detected by the active current detector 10 of the motor 1 to set the inverter frequency and voltage of the next stage, and inputs the result to the inverter control circuit 11. do. In such a circuit configuration, for example, if the frequency setting is suddenly increased, an excessive amount of current tends to flow through the motor. At this time, a limiter (not shown) is attached to the output of the frequency amplifier 7, and the values of the limiter are set to -10V and +1V, and when the drive current of the motor 1 is 100%, the output of the effective current detector 10 becomes +10V. Adjust accordingly.
In this way, when an overcurrent is about to flow, the output of the current amplifier 8 operates to become 100% current, limiting the frequency and voltage rise, and protecting against overcurrent. . Also, when the setting is suddenly lowered, a sudden regenerative current flows from the motor to the inverter, increasing the DC voltage, but the limiter mentioned above gradually lowers the inverter frequency with a current of 10% of the motor drive current. to prevent a rise in DC voltage. Here, the regeneration limiter was set to +1V (10%), but this value is preferably a value commensurate with the loss of the inverter. In addition, for devices that vary the DC voltage of the inverter or devices that can regenerate to AC power, set the value to a value commensurate with these.
以上の回路に更に次の回路を追加構成すること
で停止制御がなされる。電動機が運転中停止指令
と同時に接点１２が閉じて周波数設定を零にす
る。インバータの周波数は前述の制御系の動作に
より徐々に下降していく。そして設定器１３で設
定した低周波数設定値より低くなると比較器１４
が反転し、停止指令１６とのAND条件が論理積
１５によりできると、インバータ制御回路１１に
よりインバータを停止する。 Stop control is performed by adding the following circuit to the above circuit. When the motor is in operation, the contact 12 closes at the same time as the stop command, and the frequency setting becomes zero. The frequency of the inverter gradually decreases due to the operation of the control system described above. When the frequency becomes lower than the low frequency set value set by the setter 13, the comparator 14
is inverted and an AND condition with the stop command 16 is established by the logical product 15, the inverter control circuit 11 stops the inverter.
第４図は本考案の制御装置による始動停止タイ
ムチヤートを示す。時刻t1での始動及び時刻t2で
の停止指令（第４図ａ）に対して、始動時には電
動機１の回転数（第４図ｂ）は通常の始動制御と
同様に徐々に指令速度まで加速され、インバータ
１８の出力周波数（第４図ｃ）も徐々に上昇制御
される。時刻t2の停止時には、電源装置３の出力
周波数は前述の停止制御により徐々に下降され、
この傾斜もしくは多少の違いを持つ傾斜で電動機
の回転数も徐々に低減する。そして、電動機１が
低速回転に達した時刻t3に論理積１５の出力によ
る電源装置の運転停止がなされる。 FIG. 4 shows a start/stop time chart using the control device of the present invention. In response to a start command at time t 1 and a stop command at time t 2 (Fig. 4 a), the rotational speed of electric motor 1 (Fig. 4 b) at startup gradually reaches the command speed as in normal starting control. The output frequency of the inverter 18 (FIG. 4c) is also controlled to increase gradually. At the time of stop at time t2 , the output frequency of the power supply device 3 is gradually lowered by the above-mentioned stop control,
The rotational speed of the motor gradually decreases with this inclination or with some inclination. Then, at time t3 when the electric motor 1 reaches low speed rotation, the operation of the power supply device is stopped by the output of the logical product 15.
第５図は本考案の制御装置によるインチング制
御のタイムチヤートを示す。始動，停止が繰り返
される始動・停止指令（第５図ａ）に対して、電
動機１の回転数（第５図ｂ）も加速と減速を繰り
返すが、停止指令により回転数が下降を始めても
インバータ１８の運転は継続されその出力周波数
（第５図ｃ）は徐々に下降する。そして、次の始
動指令が入つてきても、インバータの出力周波数
と電動機の回転数とはほぼ一致しているので、通
常の設定変更と同様にインバータ、電動機共に負
担がかからず、スムーズな回転数上昇が行なわれ
る。 FIG. 5 shows a time chart of inching control by the control device of the present invention. In response to the start/stop command (Fig. 5a) that repeats starting and stopping, the rotation speed of the electric motor 1 (Fig. 5b) also repeats acceleration and deceleration, but even if the rotation speed starts to decrease due to the stop command, the inverter 18 continues to operate and its output frequency (FIG. 5c) gradually decreases. Even when the next start command is received, the inverter's output frequency and the motor's rotational speed are almost the same, so the inverter and motor are not burdened, just like normal setting changes, and the process is smooth. The rotational speed is increased.
従つて、本考案の制御装置によれば、電動機回
転中の電源装置の運転再開にも過電流を防止で
き、しかも電動機の回転数を検出したり誘起電圧
を検出して該検出値を電源装置側にフイードバツ
クする従来の手法に比べて、電源装置を主体とす
る制御が可能となり、高価な検出器等を不要にし
た装置の簡単化、コストダウンが達成される。ま
た、簡単なシーケンス変更等で電動機のインチン
グ制御も可能となる。 Therefore, according to the control device of the present invention, overcurrent can be prevented even when the power supply device restarts operation while the motor is rotating, and moreover, it can detect the rotational speed of the motor or the induced voltage and send the detected value to the power supply device. Compared to the conventional method of providing feedback to the side, it is possible to control the power supply as the main component, and it is possible to simplify the device and reduce costs by eliminating the need for expensive detectors and the like. Furthermore, inching control of the electric motor is also possible by simple sequence changes.
第１図及び第２図は従来の交流電動機用電源装
置の制御装置を示す構成図、第３図は本考案によ
る制御装置を達成するための構成図、第４図は本
考案における始動・停止制御での電動機と電源装
置の動作タイムチヤート、第５図は本考案におけ
るインチング制御での動作タイムチヤートであ
る。
１……電動機、３……電源装置、６……設定
器、７……周波数増幅器、８……電流増幅器、９
……反転増幅器、１０……有効電流検出器、１１
……インバータ制御回路、１２……停止指令によ
り閉じる接点、１３……最低周波数設定器、１４
……比較器、１５……論理積、１６……停止指
令、１７……インバータ直流電源、１８……イン
バータ。
1 and 2 are configuration diagrams showing a conventional control device for an AC motor power supply device, FIG. 3 is a configuration diagram for achieving a control device according to the present invention, and FIG. 4 is a starting/stopping diagram according to the present invention. FIG. 5 is an operation time chart of the electric motor and power supply device under control. FIG. 5 is an operation time chart of the inching control according to the present invention. 1... Electric motor, 3... Power supply device, 6... Setting device, 7... Frequency amplifier, 8... Current amplifier, 9
...Inverting amplifier, 10... Effective current detector, 11
... Inverter control circuit, 12 ... Contact that closes upon stop command, 13 ... Minimum frequency setter, 14
... Comparator, 15 ... Logical product, 16 ... Stop command, 17 ... Inverter DC power supply, 18 ... Inverter.
Claims (1)
に従つた周波数演算をし、前記設定値の増加時に
は電動機に過大な電流が流れないように出力制限
をし前記設定値の減少時には電動機の自然減速度
に合わせた出力制限をするリミツタ付き周波数増
幅器と、この増巾器の出力を電流指令として電源
装置の出力電流のうち有効電流とを突き合わせて
電源装置の周波数・電圧設定を得る電流増巾器
と、この増巾器の出力で前記電源装置を制御する
インバータ制御回路と、交流電動機の停止指令に
よつて前記周波数設定器の出力を零とする設定取
消手段と、この周波数設定値が零となつた時点よ
り徐々に出力低下する前記電流増巾器の出力信号
と低周波数設定器の設定値とを比較する比較器
と、この比較器の出力信号と前記停止信号とを論
理積入力とし出力信号でインバータ制御回路が電
源装置を停止するよう指令する論理積回路とを備
えたことを特徴とする交流電動機用電源装置の制
御装置。 The frequency is calculated according to the set value of the frequency setting device of the AC motor power supply device, and when the set value increases, the output is limited so that excessive current does not flow to the motor, and when the set value decreases, the motor naturally decreases. A frequency amplifier with a limiter that limits the output according to the speed, and a current amplifier that uses the output of this amplifier as a current command and compares it with the effective current of the output current of the power supply to determine the frequency and voltage settings of the power supply. an inverter control circuit that controls the power supply device using the output of the amplifier; a setting canceling unit that sets the output of the frequency setter to zero in response to a stop command for the AC motor; a comparator that compares the output signal of the current amplifier, whose output gradually decreases from the point at which the current amplifier is used, and the set value of the low frequency setting device; and a logical product input of the output signal of this comparator and the stop signal, and output. 1. A control device for a power supply device for an AC motor, comprising an AND circuit that instructs an inverter control circuit to stop the power supply device in response to a signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5125979U JPH0312074Y2 (en) | 1979-04-16 | 1979-04-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5125979U JPH0312074Y2 (en) | 1979-04-16 | 1979-04-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS55150700U JPS55150700U (en) | 1980-10-30 |
| JPH0312074Y2 true JPH0312074Y2 (en) | 1991-03-22 |
Family
ID=28940288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5125979U Expired JPH0312074Y2 (en) | 1979-04-16 | 1979-04-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0312074Y2 (en) |
-
1979
- 1979-04-16 JP JP5125979U patent/JPH0312074Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS55150700U (en) | 1980-10-30 |
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