JPH02131393A - Method of controlling single phase induction motor - Google Patents
Method of controlling single phase induction motorInfo
- Publication number
- JPH02131393A JPH02131393A JP63280706A JP28070688A JPH02131393A JP H02131393 A JPH02131393 A JP H02131393A JP 63280706 A JP63280706 A JP 63280706A JP 28070688 A JP28070688 A JP 28070688A JP H02131393 A JPH02131393 A JP H02131393A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- motor
- auxiliary winding
- power
- 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.)
- Granted
Links
- 230000006698 induction Effects 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 9
- 238000004804 winding Methods 0.000 claims abstract description 38
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009499 grossing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Landscapes
- Control Of Ac Motors In General (AREA)
Abstract
Description
【発明の詳細な説明】
(イ)産業上の利用分野
本発明は単相誘導電動機の回転数制御において、特に電
動機に供給する交流電力の周波数を変えた場合の制御方
法に関するものである。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a control method for controlling the rotational speed of a single-phase induction motor, particularly when changing the frequency of alternating current power supplied to the motor.
(口)従来の技術
単相誘導電動機の制御方法に関する従来の技術としては
、特開昭6 3−7 3 8 9 7号公報に記載され
たようなものがあった。この公報に記載されたものは、
可変電圧、可変周波数電源を用いて、任意の周波数の交
流電力を電動機に供給して回転数の制御を行なうもので
あった.さらに商用電源を電動機に直結するバイパス回
路を設け、電動機を可変電圧、可変周波数電源に接続し
ている際はインピーダンス素子を外して広.い周波数範
囲での定トルク運転を可能としたものである。(Example) Prior Art A conventional technology relating to a control method for a single-phase induction motor is described in Japanese Patent Application Laid-Open No. 63-73897. What is stated in this bulletin is
Using a variable voltage, variable frequency power supply, AC power of any frequency was supplied to the motor to control the rotation speed. In addition, a bypass circuit is installed to directly connect the commercial power supply to the motor, and when the motor is connected to a variable voltage or variable frequency power supply, the impedance element can be removed and widened. This enables constant torque operation in a wide frequency range.
(ハ)発明が解決しようとする課題
以上のように構成された従来の技術では、インピーダン
ス素子(コンデンサ)を付けたり外したりしたもので、
この時補助巻線に流れる電流の位相が変ってしまうもの
であり、この切挨り周波数付近では電動機にトルク変動
が生じ定トルク運転が確保されなくなるものであった。(c) Problems to be Solved by the Invention In the conventional technology configured as described above, an impedance element (capacitor) is attached or removed.
At this time, the phase of the current flowing through the auxiliary winding changes, and around this cutting frequency, torque fluctuations occur in the motor, making it impossible to ensure constant torque operation.
斯かる問題点に鑑み、本発明は周波数の可変範囲内で常
に安定した運転トルクが得られるようにした制御方法を
提供するものである。In view of such problems, the present invention provides a control method that allows stable operating torque to be obtained at all times within a frequency variable range.
(二)課題を解決するための手段
本発明の制御方法は主巻線及び補助巻線を有する単相誘
導電動機に供給する交流電力の周波数を変えてこの電動
機の回転数を制御するように成した単相誘導竃動機にお
いて、主巻線に流れる電流の量と補助巻線に流れる電流
の量との比率を供給する交流電力の周波数に基づいて変
えさせるものである.
(*)作用
このように、補助巻線に流れる電流の量を周波数に基づ
いて変えさせることによって、夫々の周波数における補
助巻線電流を制御して電動機のトルクの安定化や効率の
向上が図れる。(2) Means for Solving the Problems The control method of the present invention is configured to control the rotational speed of a single-phase induction motor having a main winding and an auxiliary winding by changing the frequency of AC power supplied to the motor. In a single-phase induction stove machine, the ratio between the amount of current flowing in the main winding and the amount of current flowing in the auxiliary winding is changed based on the frequency of the AC power supplied. (*) Effect In this way, by changing the amount of current flowing through the auxiliary windings based on the frequency, the auxiliary winding currents at each frequency can be controlled to stabilize the motor torque and improve efficiency. .
(へ)実施例
以下、本発明の制御方法を用いた実施例を図に基づいて
説明する。第1図は電気回路の概略図である.この図に
おいて、1は単相の誘導電動機であり、主巻線2と補助
巻線3とが電気角で90度ずらして固定子巻線に配設さ
れている.4は補助巻線3に接続された運転用(進相用
)のコンデンサである。5は電流制限素子(トライアッ
クなど竃流量を制御できるものであればよい)であり補
助巻線3に流れる電流量を制御できるように接続されて
いる。尚、6は制御端子であり、この端子に印加される
電圧によって電流制限素子5を流れる電流量が調節され
る。7,8は直列に接続された抵抗とコンデンサであり
電流制限素子5と並列に接続され、電流制限素子5の動
作時に大幅に生じる過渡変化分を吸収する。(F) Example Hereinafter, an example using the control method of the present invention will be described based on the drawings. Figure 1 is a schematic diagram of the electrical circuit. In this figure, 1 is a single-phase induction motor, and a main winding 2 and an auxiliary winding 3 are arranged on a stator winding with an electrical angle shifted by 90 degrees. Reference numeral 4 denotes an operating (phase advance) capacitor connected to the auxiliary winding 3. Reference numeral 5 denotes a current limiting element (any device capable of controlling the flow rate, such as a triac) is connected to the auxiliary winding 3 so as to control the amount of current flowing therethrough. Note that 6 is a control terminal, and the amount of current flowing through the current limiting element 5 is adjusted by the voltage applied to this terminal. 7 and 8 are resistors and capacitors connected in series, which are connected in parallel with the current limiting element 5 to absorb transient changes that occur significantly when the current limiting element 5 operates.
9は単相インバータ回路であり、複数のスイッチング素
子が周期的にON/OFFL,て直流電力を所望の交流
電力に変換するものである。10は整流平滑回路であり
、交流電源11から供給される電力を整流平滑した後の
直流電力を単相インバータ回路9に出力する。Reference numeral 9 denotes a single-phase inverter circuit, in which a plurality of switching elements are periodically turned ON/OFF to convert DC power into desired AC power. 10 is a rectifying and smoothing circuit, which rectifies and smoothes the power supplied from the AC power supply 11 and outputs DC power to the single-phase inverter circuit 9.
12ほO N/O F Fの信号発生部であり、周波数
信号fに基づいた周波数の交流電力が電動機1へ供給さ
れるように夫々のスイッチング素子のON/OFFを制
御する。13は電流検出器(カレントトランスなど)で
あり、電動機1に流れる交流電流の変化を検出する。1
4ほバッファである。15はゼロクロス信号発生部であ
り、バッファ14を介して入力した交流電流の変化から
ゼロクロスの時を判断してゼロクロス信号を出力する。No. 12 is an ON/OFF signal generating section, which controls ON/OFF of each switching element so that AC power having a frequency based on the frequency signal f is supplied to the electric motor 1. Reference numeral 13 denotes a current detector (such as a current transformer), which detects changes in the alternating current flowing through the motor 1. 1
4 is a buffer. Reference numeral 15 denotes a zero-crossing signal generating section, which determines the zero-crossing time from changes in the alternating current input via the buffer 14 and outputs a zero-crossing signal.
16は点弧信号発生部であり、ゼロクロス信号発生部1
5からの信号と周波数信号fとに基づいて電流制限素子
5による電流の通電量を制御する。例えば電流制限素子
5にトライアック(又はフォトトライアック)を用いた
場合、ゼロクロス信号の確認からT時間後(O≦T≦1
/2f(周波数))にt時間の間電流制限素子5による
通電を開始させて補助巻線3に流れる電流量を制御する
。16 is an ignition signal generating section, and zero cross signal generating section 1
The amount of current flowing through the current limiting element 5 is controlled based on the signal from the current limiting element 5 and the frequency signal f. For example, if a triac (or phototriac) is used as the current limiting element 5, after T time (O≦T≦1
/2f (frequency)) for a time t, the current limiting element 5 starts energizing, thereby controlling the amount of current flowing through the auxiliary winding 3.
第2図は電動機1に印加される交流電圧、交流電流の変
化を示す波形17.18に対する電流制限素子(トライ
ブック)5の通竃状態を示す説明図である。この説明図
において、左側が現時刻であり、右側に行く程過去の時
刻である。電流の波形に対してゼロクロス信号発生部1
6が出力したゼロクロス信号19よりT時間後にt時間
の間電流制限素子(トライアック)5の通寛を保って、
補助巻線3への通電を行なう。第3図は第2図に示した
交流電力より高い周波数の交流電力を電動機1に供給し
た場合の夫々の波形を示す説明図である。尚、夫々のレ
ンジは第2図のものと同じである。FIG. 2 is an explanatory diagram showing the conduction state of the current limiting element (trybook) 5 with respect to waveforms 17 and 18 showing changes in the alternating current voltage and alternating current applied to the motor 1. In this explanatory diagram, the left side is the current time, and the further to the right is the past time. Zero cross signal generator 1 for current waveform
After T time from the zero cross signal 19 outputted by TRIAC 6, current limiting element (TRIAC) 5 is kept open for t time.
The auxiliary winding 3 is energized. FIG. 3 is an explanatory diagram showing respective waveforms when AC power having a higher frequency than the AC power shown in FIG. 2 is supplied to the motor 1. Note that each range is the same as that shown in FIG.
このように夫々の周波数に基づいて電流制限素子5の通
電時間を変えることによって補助巻線3に流れる電流量
を制御して、常に主巻線2から生じる磁界の強さと補助
巻線3から生じる磁界の強さとのバランスを最適に保ち
、トルクの安定化と効率の向上が成されるものである。In this way, the amount of current flowing through the auxiliary winding 3 is controlled by changing the energization time of the current limiting element 5 based on each frequency, so that the strength of the magnetic field generated from the main winding 2 and the strength of the magnetic field generated from the auxiliary winding 3 are always adjusted. This maintains an optimal balance with the strength of the magnetic field, stabilizing torque and improving efficiency.
またコンデンサ4の周波数特性による内部インピーダン
スの変化分を考慮して補助巻線3に流れる1!流量を設
定すればさらに定トルク化が図れるものである。Also, considering the change in internal impedance due to the frequency characteristics of the capacitor 4, 1! flows to the auxiliary winding 3! By setting the flow rate, it is possible to further achieve constant torque.
(ト)発明の効果
本発明の制御方法は主巻線及び補助巻線を有する単相誘
導電動機に供給する交流電力の周波数を変えてこの電動
機の回転数を制御するように成した単相誘導電動機にお
いて、主巻線に流れる電流の量に対し補助巻線に流れる
電流の量を交流電力の周波数に基づいて変えさせるので
、交流電力の周波数に基づいて常に安定したトルクと高
効率が得られるように主巻線の電流量と補助巻線の電流
量との比を調節できるものである.従って、本発明の制
御方法を用いると電動機の周波数に依存するトルク低下
や効率低下を抑制できるものである。(G) Effects of the Invention The control method of the present invention is a single-phase induction motor having a main winding and an auxiliary winding. In electric motors, the amount of current flowing through the auxiliary windings relative to the amount of current flowing through the main windings is changed based on the frequency of the AC power, so stable torque and high efficiency can always be obtained based on the frequency of the AC power. It is possible to adjust the ratio between the amount of current in the main winding and the amount of current in the auxiliary winding. Therefore, by using the control method of the present invention, it is possible to suppress a decrease in torque and a decrease in efficiency depending on the frequency of the electric motor.
第1図は本発明の実施例を用いた電気回路の概略図、第
2図は電動機に印加される交流電圧、交流T流の変化に
対応するトライアックのON状態を示す説明図、第3図
は第2図と同様に周波数が異なる場合の説明図である。
1・・・電動機、 2・・・主巻線、 3・・・補助
巻線、5・・・′¥!t流制限素子。Figure 1 is a schematic diagram of an electric circuit using an embodiment of the present invention, Figure 2 is an explanatory diagram showing the ON state of the triac corresponding to changes in the AC voltage and AC T current applied to the motor, and Figure 3. is an explanatory diagram when the frequencies are different, similar to FIG. 2. 1...Electric motor, 2...Main winding, 3...Auxiliary winding, 5...'\! t-flow limiting element.
Claims (1)
給する交流電力の周波数を変えてこの電動機の回転数を
制御するように成した単相誘導電動機において、主巻線
に流れる電流の量と補助巻線に流れる電流の量との比率
を供給する交流電力の周波数に基づいて変えさせること
を特徴とする単相誘導電動機の制御方法。(1) In a single-phase induction motor that controls the rotational speed of the motor by changing the frequency of AC power supplied to the single-phase induction motor that has a main winding and an auxiliary winding, the current that flows through the main winding. A control method for a single-phase induction motor, characterized in that the ratio between the amount of current flowing through the auxiliary winding and the amount of current flowing through the auxiliary winding is changed based on the frequency of supplied AC power.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63280706A JP2639985B2 (en) | 1988-11-07 | 1988-11-07 | Control method of single-phase induction motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63280706A JP2639985B2 (en) | 1988-11-07 | 1988-11-07 | Control method of single-phase induction motor |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH02131393A true JPH02131393A (en) | 1990-05-21 |
JP2639985B2 JP2639985B2 (en) | 1997-08-13 |
Family
ID=17628818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63280706A Expired - Fee Related JP2639985B2 (en) | 1988-11-07 | 1988-11-07 | Control method of single-phase induction motor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2639985B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008306779A (en) * | 2007-06-05 | 2008-12-18 | Hitachi Ltd | Switching power supply unit and mounting structure thereof |
JP2011147216A (en) * | 2010-01-12 | 2011-07-28 | Fuji Electric Co Ltd | Motor driver |
JP2014113044A (en) * | 2014-02-10 | 2014-06-19 | Fuji Electric Co Ltd | Motor drive device |
-
1988
- 1988-11-07 JP JP63280706A patent/JP2639985B2/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008306779A (en) * | 2007-06-05 | 2008-12-18 | Hitachi Ltd | Switching power supply unit and mounting structure thereof |
JP2011147216A (en) * | 2010-01-12 | 2011-07-28 | Fuji Electric Co Ltd | Motor driver |
JP2014113044A (en) * | 2014-02-10 | 2014-06-19 | Fuji Electric Co Ltd | Motor drive device |
Also Published As
Publication number | Publication date |
---|---|
JP2639985B2 (en) | 1997-08-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |