JP3423888B2 - Open-phase / negative-phase operation prevention circuit for three-phase motor - Google Patents
Open-phase / negative-phase operation prevention circuit for three-phase motorInfo
- Publication number
- JP3423888B2 JP3423888B2 JP32502198A JP32502198A JP3423888B2 JP 3423888 B2 JP3423888 B2 JP 3423888B2 JP 32502198 A JP32502198 A JP 32502198A JP 32502198 A JP32502198 A JP 32502198A JP 3423888 B2 JP3423888 B2 JP 3423888B2
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- JP
- Japan
- Prior art keywords
- phase
- reverse
- relay
- prevention
- open
- 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.)
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種冷凍・冷蔵機
器等の圧縮機を駆動する三相電動機の欠相・逆相運転防
止回路に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open-phase / reverse-phase operation prevention circuit for a three-phase electric motor that drives a compressor such as various refrigeration / refrigeration equipment.
【０００２】[0002]
【従来の技術】従来、三相電動機によって駆動される圧
縮機を用いた冷凍・冷蔵機器として、例えば特開平１０
−１０３８４８号公報に記載された低温庫が知られてい
る。この低温庫は、冷凍機によって蓄冷材を凍結させた
後、任意の物品を収容して目的地まで運搬されるが、三
相交流電源に不特定の場所で頻繁に接続及び切り離しさ
れるため、接続不良等による供給電源の欠相または逆相
を生じ易いという問題点がある。そこで、このような三
相電動機の欠相・逆相運転を防止する装置として、例え
ば実公平７−３９３１１号公報に記載されているよう
に、三相電動機への三相交流電源の供給回路を開閉する
電動機駆動回路と、電動機駆動回路に供給される三相交
流電源が所定の相順序のときに接点を閉じる逆相防止リ
レーとを備えたものが知られている。この回路では、電
源投入時に三相交流電源の相順序が逆相防止リレーの相
順序と一致してリレー接点が閉じると、電動機駆動回路
が作動して電動機が駆動され、電源投入時に三相交流電
源の相順序が逆相防止リレーの相順序と一致しない場合
は、リレー接点が閉じないため電動機駆動回路が作動せ
ず、電動機が逆相状態で運転されないようになってい
る。また、前記逆相防止リレーは、三相交流電源のＲ
相，Ｓ相，Ｔ相にそれぞれ接続される抵抗器、コンデン
サ及びコイルからなり、三相交流電源の相順序が正相の
場合にコイルが励磁されて接点が閉じるようになってい
る。2. Description of the Related Art Conventionally, as a refrigerating / refrigerating device using a compressor driven by a three-phase electric motor, for example, Japanese Unexamined Patent Publication No. Hei 10 (1999) -104242
A low-temperature chamber described in Japanese Patent Laid-Open No. 103848 is known. This low-temperature storage, after freezing the regenerator material by the refrigerator, accommodates any article and is transported to the destination, but is frequently connected to and disconnected from the three-phase AC power source at an unspecified place, There is a problem that a phase failure or a reverse phase of the power supply is likely to occur due to poor connection or the like. Therefore, as a device for preventing such an open-phase / reverse-phase operation of a three-phase motor, for example, as described in Japanese Utility Model Publication No. 7-39311, a circuit for supplying a three-phase AC power source to the three-phase motor is provided. There is known a motor drive circuit that opens and closes, and a reverse phase prevention relay that closes contacts when a three-phase AC power supply supplied to the motor drive circuit is in a predetermined phase sequence. In this circuit, when the phase sequence of the three-phase AC power supply matches the phase sequence of the anti-phase prevention relay when the power is turned on and the relay contacts are closed, the motor drive circuit operates and the motor is driven. If the phase sequence of the power source does not match the phase sequence of the anti-phase prevention relay, the relay contacts do not close, so the motor drive circuit does not operate and the motor is prevented from operating in the anti-phase state. Further, the reverse phase prevention relay is a three-phase AC power source R
It consists of a resistor, a capacitor, and a coil that are connected to each of the three phases, the S phase, and the T phase. When the phase sequence of the three-phase AC power supply is the positive phase, the coil is excited and the contacts are closed.
【０００３】[0003]
【発明が解決しようとする課題】ところで、前記逆相防
止リレーでは、三相交流電源の各相のうちコイルに接続
される相が欠相した場合、コイルの励磁は起こらず接点
が閉じることはないが、コイル以外の相、即ち抵抗器及
びコンデンサの何れか一方に接続される電源に欠相が生
じた場合は、コイルが励磁されて接点が閉じることがあ
る。この場合、三相交流電源の正相・逆相に拘わらず逆
相防止リレーの接点は閉じる。即ち、従来では三相交流
電源の各相に欠相が生じていない場合、電動機の逆相運
転を防止することはできるが、コイル以外に接続される
電源に欠相が生じた場合、電動機の欠相運転を確実に防
止することはできず、しかも欠相状態では正相・逆相を
判別できないため、電動機が欠相状態で運転されている
ときに逆相状態で欠相が解消されて電動機が逆相運転す
る恐れがあった。また、従来では正相・逆相の判別が電
動機の運転開始時しか行われないため、正常運転中に欠
相を生じた場合の監視は不可能であった。By the way, in the above-mentioned anti-reverse phase relay, when one of the phases of the three-phase AC power supply connected to the coil is open, the coil is not excited and the contact is closed. However, if a phase other than the coil, that is, a phase loss occurs in the power supply connected to either the resistor or the capacitor, the coil may be excited and the contacts may be closed. In this case, the contacts of the anti-phase relay are closed regardless of the positive / negative phase of the three-phase AC power supply. That is, conventionally, when there is no open phase in each phase of the three-phase AC power supply, it is possible to prevent the reverse phase operation of the electric motor, but when the open phase occurs in the power supply connected to other than the coil, It is not possible to reliably prevent open-phase operation, and it is not possible to distinguish between positive and negative phases in the open-phase state.Therefore, when the motor is running in the open-phase state, the open-phase is eliminated in the reverse-phase state. There was a risk that the electric motor would run in reverse phase. Further, conventionally, the determination of normal phase / negative phase is performed only at the start of the operation of the electric motor, so that it is impossible to monitor when a phase loss occurs during normal operation.
【０００４】本発明は前記問題点に鑑みてなされたもの
であり、その目的とするところは、三相電動機の運転開
始時及び運転中に拘わらず、電動機の欠相運転及び逆相
運転を確実に防止することのできる三相電動機の欠相・
逆相運転防止回路を提供することにある。The present invention has been made in view of the above problems, and an object of the present invention is to reliably perform open-phase operation and reverse-phase operation of a three-phase electric motor regardless of whether the three-phase electric motor is started or running. Phase loss of three-phase motor that can be prevented
It is to provide a reverse-phase operation prevention circuit.
【０００５】[0005]
【課題を解決するための手段】本発明は前記目的を達成
するために、請求項１の三相電動機の欠相・逆相運転防
止回路は、三相電動機への三相交流電源の供給回路を開
閉する電動機駆動回路と、電動機駆動回路に供給される
三相交流電源の相順序を切換える正相・逆相切換リレー
回路と、三相交流電源の各相に接続される抵抗器、コン
デンサ及びコイルからなり、前記三相交流電源が正相の
場合に接点を閉じる第１の逆相防止リレーと、三相交流
電源の各相に接続される抵抗器、コンデンサ及びコイル
からなり、前記三相交流電源に第１の逆相防止リレーに
対して一相ずれた相順序で接続された第２の逆相防止リ
レーと、電源を投入してから所定時間経過後、第１の逆
相防止リレー及び第２の逆相防止リレーの接点が閉じて
いる場合は電動機を駆動し、第１の逆相防止リレー及び
第２の逆相防止リレーの少なくとも一つの接点が開いて
いる場合は正相・逆相切換リレー回路によって電動機駆
動回路側に供給される三相交流電源の相順序を切換え、
その所定時間経過後に第１の逆相防止リレー及び第２の
逆相防止リレーの接点が閉じている場合は電動機を駆動
し、前記所定時間経過後も第１の逆相防止リレー及び第
２の逆相防止リレーの少なくとも一方の接点が開いてい
る場合または前記所定時間経過以降に第１の逆相防止リ
レー及び第２の逆相防止リレーの少なくとも一つの接点
が開いた場合は所定の警報手段を作動させる制御手段と
を備えている。これにより、電源の投入後、第１の逆相
防止リレー及び第２の逆相防止リレーに相順序の一致し
た正相の電流が流れると、各逆相防止リレーの接点がそ
れぞれ閉じ、電動機が駆動される。また、各逆相防止リ
レーに相順序の一致しない逆相の電流が流れると、各逆
相防止リレーの接点がそれぞれ開放状態となり、電動機
駆動回路側に供給される三相交流電源の相順序が切換え
られ、その所定時間経過後に各逆相防止リレーの接点が
それぞれ閉じている場合は電動機が駆動される。この場
合、三相交流電源の各相のうち何れか一つに欠相を生じ
ていると、各逆相防止リレーの接点が閉じず、警報手段
が作動する。また、電動機が駆動された後、三相交流電
源の各相のうち何れか一つに欠相を生ずると、各逆相防
止リレーの接点が開き、警報手段が作動する。その際、
三相交流電源に欠相を生じても、供給電源の相順序によ
っては、正相・逆相に拘わらず第１の逆相防止リレー及
び第２の逆相防止リレーの何れか一方の接点が閉じるこ
とがあるが、第２の各逆相防止リレーは第１の逆相防止
リレーに対して相順序が一相ずれているため、少なくと
も一つの逆相防止リレーの接点が開放状態となり、警報
手段が作動する。In order to achieve the above object, the present invention provides an open-phase / reverse-phase operation protection for a three-phase electric motor according to claim 1.
The stop circuit is a motor drive circuit that opens and closes a supply circuit of the three-phase AC power supply to the three-phase motor, and a normal-phase / reverse-phase switching relay circuit that switches the phase sequence of the three-phase AC power supply supplied to the motor drive circuit, Resistors and capacitors connected to each phase of the three-phase AC power supply
It consists of a capacitor and a coil, and the three-phase AC power supply is of positive phase.
If the first anti-phase relay to close the contact in case of three-phase AC
Resistors, capacitors and coils connected to each phase of the power supply
Consisting of the three-phase AC power supply and the first anti-phase relay
A second reverse-phase prevention relay connected in one phase shifted phase sequence for, after a predetermined time has elapsed from turning on the power, first inverse
If the contacts of the phase prevention relay and the second anti-phase prevention relay are closed, the motor is driven, and the first anti-phase prevention relay and
When at least one contact of the second anti-phase relay is open, the phase sequence of the three-phase AC power supply supplied to the electric motor drive circuit side is switched by the positive / negative phase switching relay circuit,
When the contacts of the first anti-phase prevention relay and the second anti-phase prevention relay are closed after the elapse of the predetermined time, the electric motor is driven, and the first anti-phase prevention relay is maintained even after the elapse of the predetermined time. And the
If at least one of the contacts of the reverse phase prevention relay 2 is open or after the lapse of the predetermined time, the first reverse phase prevention relay.
Control means for activating a predetermined alarm means when at least one contact of the relay and the second anti-phase relay is opened. As a result, after the power is turned on, the first reverse phase
When a positive-phase current having the same phase sequence flows through the prevention relay and the second anti-phase prevention relay, the contacts of each anti-phase prevention relay are closed, and the electric motor is driven. In addition, when a reverse-phase current whose phase sequence does not match flows in each reverse-phase prevention relay, the contacts of each reverse-phase prevention relay are opened and the phase sequence of the three-phase AC power supply supplied to the motor drive circuit side changes. If the contacts of the respective reverse phase prevention relays are closed after a lapse of the predetermined time, the electric motor is driven. In this case, if any one of the phases of the three-phase AC power supply is open, the contact of each reverse phase prevention relay is not closed and the alarm means is activated. Further, after the electric motor is driven, if any one of the phases of the three-phase AC power supply is opened, the contact of each anti-phase prevention relay is opened and the alarm means is activated. that time,
Even if a phase loss occurs in the three-phase AC power supply, depending on the phase sequence of the power supply, the first reverse phase prevention relay and
One of the contacts of the second and second anti-phase prevention relays may be closed, but each of the second anti-phase prevention relays has the first anti-phase prevention relay .
Since phase sequence for the relay is shifted one phase, contact of at least one reverse-phase prevention relay is opened, alarm means is activated.
【０００６】また、請求項２では、請求項１記載の三相
電動機の欠相・逆相運転防止回路において、前記各逆相
防止リレーの接点を互いに直列に接続してなる欠相・逆
相検知回路を備えている。これにより、請求項１の作用
に加え、欠相・逆相検知回路の開閉状態を検知すること
により、各逆相防止リレーの接点の少なくとも一つが開
いたことが検知される。According to a second aspect of the present invention, in the open phase / reverse phase operation prevention circuit for a three-phase electric motor according to the first aspect, the open phase / reverse phase phases are formed by connecting the contacts of the respective reverse phase prevention relays in series. It has a detection circuit. With this, in addition to the operation of the first aspect, it is detected that at least one of the contacts of each anti-phase prevention relay is opened by detecting the open / closed state of the open-phase / negative-phase detection circuit.
【０００７】[0007]
【発明の実施の形態】図１及び図２は本発明の一実施形
態を示すもので、図１は欠相・逆相運転防止回路の構成
図、図２は制御部の動作を示すフローチャートである。1 and 2 show an embodiment of the present invention. FIG. 1 is a block diagram of an open / reverse phase operation prevention circuit, and FIG. 2 is a flow chart showing the operation of a control unit. is there.
【０００８】この欠相・逆相運転防止回路は、電源１の
三相交流電源によって三相電動機２を駆動する電動機駆
動回路１０と、電源１から供給される三相交流電源の相
順序を切換える正相・逆相切換リレー回路２０と、電源
１から供給される三相交流電源が所定の相順序のときに
接点を閉じる第１の逆相防止リレー３０と、電源１から
供給される三相交流電源が第１の逆相防止リレー３０に
対して一相ずれた所定の相順序のときに接点を閉じる第
２の逆相防止リレー４０と、第１及び第２の逆相防止リ
レー３０，４０の接点を含む欠相・逆相検知回路５０
と、所定の警報を発する警報装置６０と、欠相・逆相検
知回路５０の開閉状態を検知して電動機駆動回路１０、
正相・逆相切換リレー回路２０及び警報装置５０を制御
する制御部７０とから構成されている。This open-phase / reverse-phase operation prevention circuit switches the phase order of the motor drive circuit 10 for driving the three-phase motor 2 by the three-phase AC power supply of the power supply 1 and the three-phase AC power supply supplied from the power supply 1. A positive / negative phase switching relay circuit 20, a first anti-phase prevention relay 30 that closes the contacts when the three-phase AC power supplied from the power supply 1 has a predetermined phase sequence, and a three-phase supplied from the power supply 1. A second anti-phase prevention relay 40 that closes the contacts when the alternating-current power supply is in a predetermined phase sequence that is one phase out of phase with the first anti-phase prevention relay 30, and the first and second anti-phase prevention relays 30, Open-phase / reverse-phase detection circuit 50 including 40 contacts
An alarm device 60 for issuing a predetermined alarm, and an open / close state of the open / reverse phase detection circuit 50 to detect the motor drive circuit 10,
It is composed of a normal phase / reverse phase switching relay circuit 20 and a control unit 70 for controlling the alarm device 50.
【０００９】電動機駆動回路１０は電動機２側に設けら
れ、制御部７０に接続されたリレー１１により、電動機
２への電源供給回路を開閉するようになっている。The electric motor drive circuit 10 is provided on the electric motor 2 side, and a relay 11 connected to the control unit 70 opens and closes a power supply circuit to the electric motor 2.
【００１０】正相・逆相切換リレー回路２０は電源１側
に設けられ、制御部７０に接続されたリレー２１によ
り、三相交流電源の相が互いに逆の相順序になる二つの
電源供給回路を択一的に開閉し、供給電源の相順序を切
換えるようになっている。The positive / negative phase switching relay circuit 20 is provided on the power source 1 side, and by the relay 21 connected to the control unit 70, two power supply circuits in which the phases of the three-phase AC power source are in opposite phase order. Is selectively opened and closed to switch the phase order of the power supplies.
【００１１】第１の逆相防止リレー３０は、三相交流電
源の各相にそれぞれ接続される抵抗器、コンデンサ及び
コイルからなり、三相交流電源の相順序が所定順序、例
えばＲ相→Ｓ相→Ｔ相の場合にコイルが励磁されて接点
３１が閉じるようになっている。The first anti-phase relay 30 comprises a resistor, a capacitor and a coil connected to each phase of the three-phase AC power supply, and the phase order of the three-phase AC power supply is a predetermined order, for example, R phase → S. In the case of phase → T phase, the coil is excited and the contact 31 is closed.
【００１２】第２の逆相防止リレー４０は、第１の逆相
防止リレー３０と同様、三相交流電源の各相にそれぞれ
接続される抵抗器、コンデンサ及びコイルからなり、三
相交流電源の相順序が第１の逆相防止リレー３０に対し
て一相ずれた相順序、例えばＴ相→Ｒ相→Ｓ相の場合に
コイルが励磁されて接点４１が閉じるようになってい
る。即ち、第１の逆相防止リレー３０の抵抗器、コンデ
ンサ及びコイルがそれぞれ接続される相には、第２の逆
相防止リレー４０ではコイル、抵抗器及びコンデンサが
それぞれ接続される。The second anti-phase prevention relay 40, like the first anti-phase prevention relay 30, is composed of a resistor, a capacitor and a coil connected to each phase of the three-phase AC power supply. When the phase sequence is shifted by one phase with respect to the first anti-phase prevention relay 30, for example, T phase → R phase → S phase, the coil is excited and the contact 41 is closed. That is, in the second anti-phase prevention relay 40, the coil, the resistor and the capacitor are respectively connected to the phases to which the resistor, the capacitor and the coil of the first anti-phase prevention relay 30 are respectively connected.
【００１３】欠相・逆相検知回路５０は、第１及び第２
の逆相防止リレー３０，４０の接点３１，４１を互いに
直列に接続してなり、その両端は制御部７０に接続され
ている。The phase loss / reverse phase detection circuit 50 includes first and second phase detectors.
The contacts 31 and 41 of the reverse phase prevention relays 30 and 40 are connected in series with each other, and both ends thereof are connected to the control unit 70.
【００１４】警報装置６０は制御部７０に接続され、表
示ランプやブザー等の周知に機器によって構成されてい
る。The alarm device 60 is connected to the control unit 70 and is composed of well-known devices such as a display lamp and a buzzer.
【００１５】制御部７０はマイクロコンピュータからな
り、後述するプログラムによって動作するようになって
いる。The control unit 70 is composed of a microcomputer and is operated by a program described later.
【００１６】以上のように構成された欠相・逆相運転防
止回路においては、第１及び第２の逆相防止リレー３
０，４０に相順序の一致した正相の電流が流れると、両
者のコイルが励磁され、各接点３１，４１の両方が閉じ
て欠相・逆相検知回路５０が閉じる。また、第１及び第
２の逆相防止リレー３０，４０に相順序の一致しない逆
相の電流が流れると、両者のコイルが励磁されず、各接
点３１，４１の両方が開放状態となり、欠相・逆相検知
回路５０は閉じない。更に、三相交流電源の各相のうち
第１の逆相防止リレー３０のコイルまたは第２の逆相防
止リレー４０のコイルに接続される相が欠相した場合、
コイルの励磁は起こらず各接点３１，４１の何れか一方
が開放状態となり、欠相・逆相検知回路５０は閉じな
い。また、各逆相防止リレー３０，４０のうちの何れか
一方において、コイル以外の相、即ち抵抗器またはコン
デンサに接続される電源に欠相が生じた場合は、供給電
源の正相・逆相に拘わらずコイルが励磁されて接点が閉
じることがある。しかしながら、第２の逆相防止リレー
４０は第１の逆相防止リレー３０に対して一相ずれて接
続されているため、各逆相防止リレー３０，４０のうち
の何れか一方において欠相状態で接点が閉じた場合で
も、他方では接点が開放状態となり、結果的に欠相・逆
相検知回路５０は閉じない。In the open-phase / reverse-phase operation prevention circuit configured as described above, the first and second reverse-phase prevention relays 3 are provided.
When positive-phase currents having the same phase sequence flow through 0 and 40, both coils are excited, both contacts 31 and 41 are closed, and the open-phase / reverse-phase detection circuit 50 is closed. Further, when a reverse-phase current whose phase sequence does not match flows in the first and second reverse-phase preventing relays 30 and 40, both coils are not excited and both contacts 31 and 41 are in an open state, causing a failure. The phase / negative phase detection circuit 50 is not closed. Further, when the phase connected to the coil of the first anti-phase prevention relay 30 or the coil of the second anti-phase prevention relay 40 among the respective phases of the three-phase AC power supply is missing,
The excitation of the coil does not occur and either one of the contacts 31 and 41 is in the open state, and the open-phase / reverse-phase detection circuit 50 is not closed. Further, in any one of the reverse phase prevention relays 30 and 40, when a phase other than a coil, that is, a power supply connected to a resistor or a capacitor has a phase loss, a normal phase / reverse phase of the power supply is supplied. However, the coil may be excited and the contact may be closed. However, since the second anti-phase prevention relay 40 is connected to the first anti-phase prevention relay 30 with a phase shift, one of the anti-phase prevention relays 30 and 40 is out of phase. Even when the contact is closed at, the contact is opened at the other side, and as a result, the open-phase / reverse-phase detection circuit 50 is not closed.
【００１７】次に、図２を参照し、前記制御部７０の動
作について説明する。まず、電源が投入され（Ｓ１）、
所定時間Ｔ1 （例えば２．５秒）が経過した後（Ｓ
２）、欠相・逆相検知回路５０が閉じていた場合（Ｓ
３）、即ち供給電源の相順序が第１及び第２の逆相防止
リレー３０，４０の相順序と一致していたならば、電動
機２を駆動する（Ｓ４）。また、前記ステップＳ３にお
いて欠相・逆相検知回路５０が閉じていない場合は、供
給電源が欠相または逆相状態であることが想定されるの
で、正相・逆相切換リレー回路２０によって供給電源の
相順序を切換える（Ｓ５）。この後、所定時間Ｔ2 （例
えば２．０秒）が経過し（Ｓ６）、欠相・逆相検知回路
５０が閉じているならば（Ｓ７）、供給電源が正相とな
っているので、前記ステップＳ４に移行して電動機２を
駆動する。また、前記ステップＳ５において相順序を切
換えても、前記ステップＳ７において欠相・逆相検知回
路５０が閉じていない場合には、供給電源が欠相を生じ
ていることが想定されるので、警報装置６０を作動する
（Ｓ８）。一方、前記ステップＳ４において電動機２を
駆動した後、欠相・逆相検知回路５０の閉じた状態が維
持され（Ｓ９）、電源が遮断されなければ（Ｓ１０）、
電動機２の運転を継続し、その後、運転終了等に伴い、
ステップＳ１０において電源が遮断されたならば、電動
機２を停止する（Ｓ１１）。また、電動機２の運転中、
前記ステップＳ９において欠相・逆相検知回路５０が開
いた場合には、供給電源に欠相を生じたことが想定され
るので、警報装置６０を作動し（Ｓ１２）、ステップＳ
１１に移行して電動機２を停止する。Next, the operation of the control unit 70 will be described with reference to FIG. First, the power is turned on (S1),
After a predetermined time T1 (eg, 2.5 seconds) has elapsed (S
2) If the open-phase / reverse-phase detection circuit 50 is closed (S
3) That is, if the phase sequence of the power supply matches the phase sequence of the first and second anti-phase prevention relays 30 and 40, the electric motor 2 is driven (S4). If the open-phase / reverse-phase detection circuit 50 is not closed in step S3, it is assumed that the power supply is in the open-phase or reverse-phase state. The power supply phase sequence is switched (S5). After that, if the predetermined time T2 (for example, 2.0 seconds) has passed (S6) and the open-phase / reverse-phase detection circuit 50 is closed (S7), the power supply is in the positive phase. In step S4, the electric motor 2 is driven. Even if the phase order is switched in step S5, if the open-phase / reverse-phase detection circuit 50 is not closed in step S7, it is assumed that the power supply is out of phase. The device 60 is operated (S8). On the other hand, after the electric motor 2 is driven in step S4, the open / reverse phase detection circuit 50 is maintained in the closed state (S9), and the power is not cut off (S10),
The operation of the electric motor 2 is continued, and thereafter, with the completion of the operation,
If the power is cut off in step S10, the electric motor 2 is stopped (S11). Also, during operation of the electric motor 2,
If the open-phase / reverse-phase detection circuit 50 is opened in step S9, it is assumed that the supply power is out of phase, and the alarm device 60 is activated (S12).
11, the motor 2 is stopped.
【００１８】このように、本実施形態の欠相・逆相運転
防止回路によれば、電源１の供給回路に所定の相順序で
接続された第１の逆相防止リレー３０の接点３１と、電
源の供給回路に第１の逆相防止リレー３０に対して一相
ずれた所定の相順序で接続された第２の逆相防止リレー
４０の接点４１のうち、少なくとも一方の接点３１，４
１が開放状態の場合、正相・逆相切換リレー回路２０に
よって供給電源の相順序を切換え、更に各接点３１，４
１の少なくとも一方が開放状態、或いは電動機２の運転
中に開放状態となった場合は、警報装置６０を作動する
ようにしたので、電動機２の運転開始時及び運転中に拘
わらず、電動機２の欠相運転及び逆相運転を確実に防止
することができる。また、本実施形態によれば、第１及
び第２の逆相防止リレー３０，４０の接点３１，４１を
互いに直列に接続してなる欠相・逆相検知回路５０の開
閉状態を検知することにより、第１及び第２の逆相防止
リレー３０，４０の接点３１，４１の少なくとも一方が
開いたことを検知することができるので、回路構成及び
制御プログラムの簡素化を図ることができる。As described above, according to the open-phase / reverse-phase operation prevention circuit of this embodiment, the contact 31 of the first reverse-phase prevention relay 30 connected to the supply circuit of the power source 1 in a predetermined phase sequence, At least one of the contacts 31, 4 of the contacts 41 of the second anti-phase prevention relay 40 that is connected to the power supply circuit in a predetermined phase sequence that is one phase out of phase with the first anti-phase prevention relay 30.
When 1 is open, the phase sequence of the power supply is switched by the normal phase / reverse phase switching relay circuit 20.
If at least one of the two is in the open state, or if it is in the open state while the electric motor 2 is operating, the alarm device 60 is activated. It is possible to reliably prevent the open phase operation and the reverse phase operation. Further, according to the present embodiment, it is possible to detect the open / closed state of the open-phase / reverse-phase detection circuit 50 in which the contacts 31 and 41 of the first and second anti-phase prevention relays 30 and 40 are connected in series with each other. Thus, it is possible to detect that at least one of the contacts 31 and 41 of the first and second anti-phase relays 30 and 40 is opened, so that the circuit configuration and the control program can be simplified.
【００１９】尚、前記実施形態では、電源１の供給回路
に２つの逆相防止リレー３０，４０を設けるようにした
が、同等に構成された３つの逆相防止リレーを互いに相
順序を一相ずつずらして設けるようにしてもよい。In the above embodiment, the two anti-phase prevention relays 30 and 40 are provided in the supply circuit of the power source 1. However, three anti-phase prevention relays of the same construction are arranged in the same phase sequence. You may make it stagger and provide it.
【００２０】[0020]
【発明の効果】以上説明したように、請求項１の欠相・
逆相運転防止回路によれば、三相電動機の運転開始時及
び運転中に拘わらず、電動機の欠相運転及び逆相運転を
確実に防止することができるので、例えば物品輸送用の
低温庫のように、不特定の場所で頻繁に電源の接続及び
切り離しを行う機器においては極めて有利である。As described above, the missing phase of claim 1
According to the anti-phase operation prevention circuit, the open-phase operation and the anti-phase operation of the electric motor can be surely prevented regardless of whether the three-phase electric motor is started or being operated. As described above, it is extremely advantageous for a device that frequently connects and disconnects a power source at an unspecified place.
【００２１】また、請求項２の欠相・逆相運転防止回路
によれば、請求項１の効果に加え、回路構成及び制御プ
ログラムの簡素化を図ることができるので、実用化に際
して極めて有利である。Further, according to the open-phase / reverse-phase operation prevention circuit of the second aspect, in addition to the effect of the first aspect, the circuit configuration and the control program can be simplified, which is extremely advantageous in practical use. is there.
【図１】本発明の一実施形態を示す欠相・逆相運転防止
回路の構成図FIG. 1 is a configuration diagram of an open-phase / reverse-phase operation prevention circuit showing an embodiment of the present invention.
【図２】制御部の動作を示すフローチャートFIG. 2 is a flowchart showing the operation of the control unit.
１…電源、２…電動機、１０…電動機駆動回路、２０…
正相・逆相切換リレー回路、３０…第１の逆相防止リレ
ー、３１…接点、４０…第２の逆相防止リレー４０、４
１…接点、５０…欠相・逆相検知回路、６０…警報装
置、７０…制御部。1 ... Power source, 2 ... Motor, 10 ... Motor drive circuit, 20 ...
Normal phase / reverse phase switching relay circuit, 30 ... First reverse phase prevention relay, 31 ... Contact, 40 ... Second reverse phase prevention relay 40, 4
DESCRIPTION OF SYMBOLS 1 ... Contact point, 50 ... Open phase / reverse phase detection circuit, 60 ...
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平10−103848（ＪＰ，Ａ) 特開 平10−66250（ＪＰ，Ａ) 特公 平８−27319（ＪＰ，Ｂ２) 実公 平７−39311（ＪＰ，Ｙ２) (58)調査した分野(Int.Cl.7，ＤＢ名) H02H 7/06 - 7/097 H02P 7/36 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-103848 (JP, A) JP-A-10-66250 (JP, A) JP-B 8-27319 (JP, B2) JP-B 7- 39311 (JP, Y2) (58) Fields investigated (Int.Cl. 7 , DB name) H02H 7 /06-7/097 H02P 7/36
Claims (2)
を開閉する電動機駆動回路と、 電動機駆動回路に供給される三相交流電源の相順序を切
換える正相・逆相切換リレー回路と、三相交流電源の各相に接続される抵抗器、コンデンサ及
びコイルからなり、前記三相交流電源が正相の場合に接
点を閉じる第１の逆相防止リレーと、 三相交流電源の各相に接続される抵抗器、コンデンサ及
びコイルからなり、前記三相交流電源に第１の逆相防止
リレーに対して一相ずれた相順序で接続された第２の 逆
相防止リレーと、 電源を投入してから所定時間経過後、第１の逆相防止リ
レー及び第２の逆相防止リレーの接点が閉じている場合
は電動機を駆動し、第１の逆相防止リレー及び第２の逆
相防止リレーの少なくとも一つの接点が開いている場合
は正相・逆相切換リレー回路によって電動機駆動回路側
に供給される三相交流電源の相順序を切換え、その所定
時間経過後に第１の逆相防止リレー及び第２の逆相防止
リレーの接点が閉じている場合は電動機を駆動し、前記
所定時間経過後も第１の逆相防止リレー及び第２の逆相
防止リレーの少なくとも一方の接点が開いている場合ま
たは前記所定時間経過以降に第１の逆相防止リレー及び
第２の逆相防止リレーの少なくとも一つの接点が開いた
場合は所定の警報手段を作動させる制御手段とを備えた
ことを特徴とする三相電動機の欠相・逆相運転防止回
路。1. A motor drive circuit that opens and closes a supply circuit of a three-phase AC power supply to a three-phase motor, and a normal-phase / reverse-phase switching relay circuit that switches the phase sequence of the three-phase AC power supply supplied to the motor drive circuit. , Resistors and capacitors connected to each phase of the three-phase AC power supply
And a coil, and is connected when the three-phase AC power supply is in positive phase.
The first reverse phase prevention relay that closes the point, and the resistors, capacitors, and capacitors connected to each phase of the three-phase AC power supply.
And a coil to prevent the first reverse phase of the three-phase AC power supply.
A second reverse-phase prevention relay connected in one phase shifted phase sequence to the relay, after a predetermined time has elapsed from turning on the power, first reverse-phase anti-Li
Drive the electric motor when the contacts of the relay and the second anti-phase prevention relay are closed, and the normal phase when at least one contact of the first anti-phase relay and the second anti-phase relay is open. The phase sequence of the three-phase AC power supply supplied to the motor drive circuit side is switched by the reverse phase switching relay circuit, and after the lapse of a predetermined time, the contacts of the first reverse phase prevention relay and the second reverse phase prevention relay are closed. If the motor is driven, if at least one of the contacts of the first anti-phase prevention relay and the second anti-phase prevention relay is open even after the elapse of the predetermined time, or if the first reverse operation is performed after the elapse of the predetermined time. Phase prevention relay and
A control circuit for preventing open-phase / reverse-phase operation of a three-phase electric motor, comprising: a control means for activating a predetermined alarm means when at least one contact of the second reverse-phase prevention relay is opened.
列に接続してなる欠相・逆相検知回路を備えたことを特
徴とする請求項１記載の三相電動機の欠相・逆相運転防
止回路。2. The open-phase / reverse-phase of the three-phase motor according to claim 1, further comprising an open-phase / reverse-phase detection circuit in which contacts of each of the reverse-phase prevention relays are connected in series with each other. Driving prevention circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32502198A JP3423888B2 (en) | 1998-11-16 | 1998-11-16 | Open-phase / negative-phase operation prevention circuit for three-phase motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32502198A JP3423888B2 (en) | 1998-11-16 | 1998-11-16 | Open-phase / negative-phase operation prevention circuit for three-phase motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000152491A JP2000152491A (en) | 2000-05-30 |
| JP3423888B2 true JP3423888B2 (en) | 2003-07-07 |
Family
ID=18172264
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32502198A Expired - Fee Related JP3423888B2 (en) | 1998-11-16 | 1998-11-16 | Open-phase / negative-phase operation prevention circuit for three-phase motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3423888B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5164521B2 (en) * | 2007-10-22 | 2013-03-21 | サンデン株式会社 | Three-phase motor drive control device |
| JP2009189205A (en) * | 2008-02-08 | 2009-08-20 | Furukawa Rock Drill Co Ltd | Phase switching device |
| CN102214913A (en) * | 2011-05-09 | 2011-10-12 | 中国振华集团群英无线电器材厂 | Sealed phase shortage protection relay of three-phase source |
| CN103420273B (en) * | 2013-07-26 | 2015-11-25 | 许宾 | alarm signal conversion device |
| CN104506109A (en) * | 2015-01-05 | 2015-04-08 | 齐齐哈尔轨道交通装备有限责任公司 | Motor control method and motor controller |
| CN105048918B (en) * | 2015-07-08 | 2017-10-20 | 河南科技大学 | A kind of brshless DC motor adaptive fuzzy control method |
| CN105429520B (en) * | 2015-12-02 | 2018-07-20 | 葛氏控股有限公司 | A kind of discrimination method of permanent magnet synchronous motor rotating speed |
| CN109063990B (en) * | 2018-07-20 | 2020-08-11 | 湖南大学 | Servo system response performance evaluation method |
| CN110398639A (en) * | 2019-08-12 | 2019-11-01 | 合肥天鹅制冷科技有限公司 | A three-phase alternating current automatic adjustment detection circuit |
-
1998
- 1998-11-16 JP JP32502198A patent/JP3423888B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2000152491A (en) | 2000-05-30 |
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