JPH0522967A - Starting method for ac motor by use of inverter - Google Patents
Starting method for ac motor by use of inverterInfo
- Publication number
- JPH0522967A JPH0522967A JP3192449A JP19244991A JPH0522967A JP H0522967 A JPH0522967 A JP H0522967A JP 3192449 A JP3192449 A JP 3192449A JP 19244991 A JP19244991 A JP 19244991A JP H0522967 A JPH0522967 A JP H0522967A
- Authority
- JP
- Japan
- Prior art keywords
- motor
- inverter
- rotation speed
- control
- commercial
- 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
Landscapes
- Motor And Converter Starters (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、インバータによる交流
モーターの起動において、インバータにより設定した所
望の回転数に短時間で到達させるようにした起動方法に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting method for starting an AC motor by an inverter so that a desired number of revolutions set by the inverter can be reached in a short time.
【０００２】[0002]
【従来の技術】インバータによる交流モーターは商用交
流電源を任意の周波数に変換して所望の回転数で駆動す
ることができるのであるが、インバータは過電流を抑え
るため起動トルクが小さく、最初からインバータ制御で
起動すると、回転数の立ち上がり速度が遅く所望の回転
数に到達するのに長時間を要する欠点があり、特に、圧
造機のように慣性モーメントの大きいフライホイールを
有する機器においてはその傾向が著しく生産能率向上の
妨げとなつていた。2. Description of the Related Art An AC motor using an inverter can convert a commercial AC power source into an arbitrary frequency and drive it at a desired rotation speed. When started by control, there is a drawback that the rising speed of the rotation speed is slow and it takes a long time to reach the desired rotation speed, and this tendency tends to occur especially in equipment having a flywheel with a large moment of inertia such as a forging machine. This has significantly hindered the improvement of production efficiency.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、インバータ制御により起動すると回転数の
立ち上がり速度が遅いことである。The problem to be solved by the present invention is that the start-up speed of the rotational speed is slow when starting by inverter control.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記課題を解
決するための手段として、所望の回転数より高い回転数
を定常回転数とする極数における商用交流電源による回
転数の立ち上がりの途中においてインバータ制御に切り
替える構成とした。As a means for solving the above-mentioned problems, the present invention is in the middle of the rising of the rotational speed by a commercial AC power source at the number of poles where the rotational speed higher than the desired rotational speed is the steady rotational speed. In the above, the configuration is switched to inverter control.
【０００５】[0005]
【発明の作用及び効果】本発明は上記構成になり、起動
時には商用交流電源で駆動するため定常回転時の数倍の
過電流が流れることにより大きなトルクが生じて回転数
が急速に立ち上がる。そして、その際の極数によつて定
まる定常回転数より低く設定した所望の回転数に達する
前にインバータ制御に切り替えると立ち上がり速度が徐
々に減速しながら所望の回転数に達し、その回転数が維
持されるのであつて、最初からインバータ制御で起動し
た場合に比べて大きなトルクが得られ、著しく短時間で
所望の回転数に到達することができる効果がある。The present invention has the above-described structure, and since it is driven by the commercial AC power supply at the time of start-up, a large torque is generated due to an overcurrent several times as large as that at the time of steady rotation, and the number of rotations rises rapidly. Then, when switching to the inverter control before reaching the desired rotation speed set lower than the steady rotation speed determined by the number of poles at that time, the rising speed gradually decreases while reaching the desired rotation speed, and the rotation speed becomes Since it is maintained, a large torque can be obtained as compared with the case where the engine is started by the inverter control from the beginning, and there is an effect that the desired rotation speed can be reached in a remarkably short time.
【０００６】[0006]
【実施例】所望の回転数Ｎが，モーターを極数１２にし
て商用交流電源で駆動する場合の定常回転数ｎ1と極数
６にして商用交流電源で駆動する場合の定常回転数ｎ2
の間にある場合を一実施例として図１に基づいて説明す
る。EXAMPLE A desired rotation speed N is a steady rotation speed n 1 when the motor is driven by a commercial AC power source with a pole number of 12 and a steady rotation speed n 2 when a motor is driven by a commercial AC power source with a pole number of 6.
A case between the two will be described as an example with reference to FIG.
【０００７】まず、モーターを極数１２にして商用交流
電源で駆動すると、大きな過電流が流れて大トルクが生
じるため、急速に立ち上がつて時間Ｔ1で定常回転数ｎ1
に達する。この回転数を時間Ｔ2まで維持してからモータ
ーを極数６にしてそのまま商用交流電源により駆動する
と鎖線で示すように再び急速に立ち上がつて定常回転数
ｎ2に達するのであるが、時間Ｔ2から短時間たつた時間
Ｔ3においてインバータ制御に切り替えると実線で示す
ように立ち上がりが緩やかになり、時間Ｔ4において所望
の回転数Ｎに達する。First, when the motor is driven by a commercial AC power source with 12 poles, a large overcurrent flows and a large torque is generated, so that the motor rapidly rises and at time T 1 , the steady speed n 1
Reach If this motor is maintained at the time T 2 and then the motor is driven with a commercial AC power supply with the number of poles being 6 as it is, the motor rapidly rises again to reach the steady speed n 2 as shown by the chain line. When the control is switched to the inverter control at a time T 3 after a short time from T 2 , the rising becomes gentle as shown by the solid line, and the desired rotation speed N is reached at the time T 4 .
【０００８】これに対し、最初からインバータ制御を行
うと過電流が抑えられてトルクが小さいため破線で示す
ように立ち上がりが緩やかであつて時間Ｔ5において所
望の回転数Ｎに到達するのであり、上記の本発明方法に
比べて著しく長時間を要する。On the other hand, when the inverter control is performed from the beginning, the overcurrent is suppressed and the torque is small, so that the rising is gentle as shown by the broken line and the desired rotation speed N is reached at the time T 5 . Compared with the above-mentioned method of the present invention, it takes a considerably long time.
【図１】本発明方法の起動方法の一実施例を示すグラフ
である。FIG. 1 is a graph showing an example of an activation method of the method of the present invention.
Claims (1)
数とする極数における商用交流電源による交流モーター
の立ち上がりの途中において極数変換起動制御からイン
バータ制御に切り替えることを特徴とするインバータに
よる交流モーターの起動方法。Claims: 1. Switching from pole number conversion start control to inverter control during the start-up of an AC motor by a commercial AC power source at a pole number whose rotation speed is higher than a desired rotation speed and which is a steady rotation speed. A method of starting an AC motor using an inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3192449A JPH0522967A (en) | 1991-07-05 | 1991-07-05 | Starting method for ac motor by use of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3192449A JPH0522967A (en) | 1991-07-05 | 1991-07-05 | Starting method for ac motor by use of inverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0522967A true JPH0522967A (en) | 1993-01-29 |
Family
ID=16291491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3192449A Pending JPH0522967A (en) | 1991-07-05 | 1991-07-05 | Starting method for ac motor by use of inverter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0522967A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687976B1 (en) | 1999-10-04 | 2004-02-10 | Tdk Corporation | Method of manufacturing magnetic head slider and method of fixing magnetic head slider |
| US8573251B2 (en) | 2009-08-27 | 2013-11-05 | Smc Kabushiki Kaisha | Flow rate control valve |
-
1991
- 1991-07-05 JP JP3192449A patent/JPH0522967A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6687976B1 (en) | 1999-10-04 | 2004-02-10 | Tdk Corporation | Method of manufacturing magnetic head slider and method of fixing magnetic head slider |
| US8573251B2 (en) | 2009-08-27 | 2013-11-05 | Smc Kabushiki Kaisha | Flow rate control valve |
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