JP2003189649A - Starter for cage type induction motor - Google Patents
Starter for cage type induction motorInfo
- Publication number
- JP2003189649A JP2003189649A JP2001378088A JP2001378088A JP2003189649A JP 2003189649 A JP2003189649 A JP 2003189649A JP 2001378088 A JP2001378088 A JP 2001378088A JP 2001378088 A JP2001378088 A JP 2001378088A JP 2003189649 A JP2003189649 A JP 2003189649A
- Authority
- JP
- Japan
- Prior art keywords
- induction motor
- starting
- cage induction
- squirrel
- resistance element
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、交流電圧の投入
又は遮断時に、かご型誘導電動機の一次側巻線に流れる
励磁突入電流を軽減するためのかご型誘導電動機の始動
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting device for a squirrel cage induction motor for reducing an exciting inrush current flowing in a primary winding of a squirrel cage induction motor when an alternating voltage is applied or cut off.
【０００２】[0002]
【従来の技術】誘導電動機は、固定子および回転子に互
いに独立した電気子巻線を持ち、一方の巻線から他方の
巻線へ電磁誘導作用によってエネルギーを伝えて回転子
を動作させるものであり、定常運転状態では非同期速度
で回転する交流電動機である。特に二次側巻線がスロッ
ト内に収められた棒状の導体と、回転子鉄心の両側でこ
れら棒状の導体を短絡する短絡環よりなる誘導電動機を
かご型誘導電動機と称し、三相交流電力を回転動力に変
換する装置として広く用いられている。2. Description of the Related Art An induction motor has a stator and a rotor that have independent armature windings, and transfers energy from one winding to the other by electromagnetic induction to operate the rotor. Yes, it is an AC motor that rotates at an asynchronous speed in the steady operation state. In particular, an induction motor consisting of a rod-shaped conductor in which the secondary winding is housed in a slot and a short-circuit ring that short-circuits these rod-shaped conductors on both sides of the rotor core is called a cage-type induction motor. It is widely used as a device that converts rotational power.
【０００３】このようなかご型誘導電動機では、一般的
に始動時には始動トルクが１００〜２００％程度しか出
ないため、エネルギー蓄積により、始動電流が５００〜
７００％程度に達する。この電動機を始動する場合、一
般的には図３に示すように、定格電圧の電源に直接接続
する直入れ始動（全電圧始動）が用いられる。図におい
て、１１は交流電源、１２は交流電源１１の開閉を行な
うための電源開閉器、１３は電力を供給させることによ
り回転動作を行なうかご型誘導電動機である。In such a squirrel-cage induction motor, the starting torque is generally only about 100 to 200% at the time of starting, so that the starting current is 500 to 500 due to energy accumulation.
It reaches about 700%. When starting this electric motor, generally, as shown in FIG. 3, a direct-insertion start (a full-voltage start) is used in which the power is directly connected to a rated voltage. In the figure, 11 is an AC power supply, 12 is a power supply switch for opening and closing the AC power supply 11, and 13 is a squirrel-cage induction motor that rotates by supplying electric power.
【０００４】この直入れ始動方法は最も簡単な始動方法
であって、普通かご型誘導電動機自身は直入れ始動可能
に作られている。しかし電源容量が小さい場合、電動機
負荷の慣性が大きく、始動時間が短いときの発熱が生じ
る場合、あるいは高トルクが電動機負荷にショックを与
える場合等のように、直入れ始動が困難な場合がある。This direct-insertion starting method is the simplest starting method, and the ordinary squirrel-cage induction motor itself is designed to be directly insertable. However, when the power supply capacity is small, the inertia of the motor load is large, heat is generated when the starting time is short, or when high torque shocks the motor load, direct-insertion start may be difficult. .
【０００５】そこで、従来始動電流を軽減する手段とし
て、スターデルタ（Ｙ−Δ）始動、リアクトル始動、補
償器始動（コンドルファ始動）等各種の始動方法が用い
られている。図４は従来からあるリアクトル起動方式の
回路構成図であり、図において、１４は電源開閉器１２
とかご型誘導電動機１３との間にある切り替え用開閉
器、１５は三相リアクトルである。Therefore, various starting methods such as star delta (Y-Δ) starting, reactor starting, compensator starting (condorfa starting) are conventionally used as means for reducing the starting current. FIG. 4 is a circuit diagram of a conventional reactor starting method, in which 14 is a power switch 12.
A switch for switching between the squirrel cage induction motor 13 and 15 is a three-phase reactor.
【０００６】電動機始動時には電源開閉器１２とかご型
誘導電動機１３間にある切り替え用開閉器１４を開放し
ておくことにより、電源電圧は三相リアクトル１５を介
してかご型誘導電動機１３へ印加されるため、過大な始
動電流を抑制することが出来る。かご型誘導電動機１３
が始動し、定格回転付近まで回転数が上昇し、電流値が
定格値付近まで降下した時点で切り替え用開閉器１４を
閉じる。これにより、電源電圧が直接かご型誘導電動機
１３に印加され、定格回転される。一般に、始動電圧は
定格電圧の５０〜８０％に選び、始動時の端子電圧と定
格電圧との比をａとすれば、始動電流および始動トルク
は全電圧始動のａ２倍に減少する。By opening the switching switch 14 between the power source switch 12 and the squirrel cage induction motor 13 when the motor is started, the power source voltage is applied to the squirrel cage induction motor 13 through the three-phase reactor 15. Therefore, an excessive starting current can be suppressed. Basket type induction motor 13
Is started, the number of rotations increases to near the rated speed, and the switching switch 14 is closed when the current value drops to near the rated value. As a result, the power supply voltage is directly applied to the squirrel cage induction motor 13 and the rated rotation is performed. Generally, if the starting voltage is selected to be 50 to 80% of the rated voltage and the ratio of the terminal voltage and the rated voltage at the time of starting is a, the starting current and the starting torque are reduced to a 2 times the full voltage starting.
【０００７】[0007]
【発明が解決しようとする課題】従来のかご型誘導電動
機の始動装置は以上のように構成されていたので、上記
各種始動装置は、その回路構成が複雑となってしまう。
又、直入れ始動の時に必要な開閉器以外に開閉器が必要
となり、更に開閉器を入り切りするための制御回路が必
要になるなどの問題点があった。Since the conventional starting device for the squirrel cage induction motor is constructed as described above, the circuit structure of each of the starting devices is complicated.
Further, there is a problem in that a switch is required in addition to the switch required at the time of direct insertion start, and a control circuit for opening and closing the switch is required.
【０００８】この発明は上記のような課題を解決するた
めになされたものであり、かご型誘導電動機の始動時に
おける始動電流を抑制しつつ、簡易な回路構成により、
かご型誘導電動機の始動を行うことができる始動装置を
提供することを目的とする。The present invention has been made in order to solve the above problems, and suppresses the starting current at the time of starting the squirrel-cage induction motor, and has a simple circuit configuration.
An object of the present invention is to provide a starting device capable of starting a squirrel cage induction motor.
【０００９】[0009]
【課題を解決するための手段】この発明の請求項１に係
るかご型誘導電動機の始動装置は、かご型誘導電動機の
一次側巻線と電源開閉器との間に始動電流を抑制するた
めのＰＴＣ抵抗素子を直列接続したものである。A starting device for a squirrel-cage induction motor according to claim 1 of the present invention is for suppressing a starting current between a primary winding of a squirrel-cage induction motor and a power switch. The PTC resistance elements are connected in series.
【００１０】この発明の請求項２に係るかご型誘導電動
機の始動装置は、かご型誘導電動機の一次側巻線と電源
開閉器との間にＰＴＣ抵抗素子を直列接続するととも
に、ＰＴＣ抵抗素子に対してリアクトルを並列に接続し
たものである。In the squirrel-cage induction motor starting device according to a second aspect of the present invention, a PTC resistance element is connected in series between the primary side winding of the squirrel-cage induction motor and the power switch, and the PTC resistance element is connected to the PTC resistance element. On the other hand, the reactor is connected in parallel.
【００１１】[0011]
【発明の実施の形態】実施の形態１．以下、この発明の
一実施形態を図に基づいて説明する。図１はこの発明の
実施の形態１によるかご型誘導電動機の始動装置を示す
回路構成図であり、図において、１は交流電源、２は交
流電源１の開閉を行なうための電源開閉器、３は電力が
供給されることにより回転動作を行なうかご型誘導電動
機、４は電源開閉器２とかご型誘導電動機３との間に挿
入されたＰＴＣ（ｐｏｓｉｔｉｖｅ ｔｅｍｐｅｒａｔ
ｕｒｅ ｃｏｅｆｆｉｃｉｅｎｔ）抵抗素子である。BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a circuit configuration diagram showing a starting device for a squirrel cage induction motor according to Embodiment 1 of the present invention. In FIG. 1, 1 is an AC power source, 2 is a power switch for opening and closing an AC power source, 3 Is a squirrel-cage induction motor that rotates by being supplied with electric power, and 4 is a PTC (positive temperature) inserted between the power switch 2 and the squirrel-cage induction motor 3.
ure coefficient) resistance element.
【００１２】このＰＴＣ抵抗素子４は、温度上昇ととも
に抵抗値が増大する正の温度係数をもった抵抗素子であ
り、定常時のときは低抵抗値を呈するが、電流の増加に
よりその抵抗値が急激に増加するものである。その構成
は本発明においては、例えば、（Ｖ１−ｘＣｒｘ）２Ｏ
３（但し、０≦ｘ≦０．０１５）を１１００℃以上で仮
焼し、この仮焼物に焼結助剤としてＦｅを混合し、更に
この混合物を１５３５℃以上の熱で焼成することで得ら
れるものを用いることが有効である。これは、通常はヒ
ューズのような管状、板状に形成されるが、その寸法は
かご型誘導電動機の容量、接続部位に応じて適当に決定
される。The PTC resistance element 4 is a resistance element having a positive temperature coefficient in which the resistance value increases as the temperature rises, and exhibits a low resistance value in a steady state, but its resistance value increases due to an increase in current. It will increase rapidly. The structure is, for example, (V 1-x C rx ) 2 O in the present invention.
3 (provided that 0 ≦ x ≦ 0.015) is calcined at 1100 ° C. or higher, Fe is mixed with this calcined product as a sintering aid, and the mixture is fired at heat of 1535 ° C. or higher. It is effective to use the available one. This is usually formed in a tubular shape such as a fuse, or a plate shape, but its size is appropriately determined according to the capacity of the squirrel cage induction motor and the connecting portion.
【００１３】上記構成の回路を使用すると、定常時には
ＰＴＣ抵抗素子４を挿入接続したことによる電力損失は
殆ど無いが、電源開閉器２を閉じることにより始動電流
が流れると、ジュール熱によりＰＴＣ抵抗素子４が発熱
し、同時にその抵抗値が急激に増加して始動電流を流し
にくくする。このときはＰＴＣ抵抗素子４の挿入接続箇
所に、あたかも大きな負荷を接続したように作用するの
で、かご型誘導電動機３の一次側巻線に導かれる電流は
十分低減されたものとなる。When the circuit having the above-mentioned structure is used, there is almost no power loss due to the insertion and connection of the PTC resistance element 4 in the steady state, but when the starting current flows by closing the power switch 2, the PTC resistance element is generated by Joule heat. 4 generates heat, and at the same time, its resistance value rapidly increases, making it difficult for the starting current to flow. At this time, since it acts as if a large load is connected to the insertion connection portion of the PTC resistance element 4, the current guided to the primary winding of the squirrel cage induction motor 3 is sufficiently reduced.
【００１４】したがって、過大な始動電流が発生するこ
とによる配電線の異常な電圧降下、および巻線の焼損等
を防止することができ、又、かご型誘導電動機３に流入
する始動電流が抑制されることにより、始動電流が大き
いことによる直入れ始動が困難な場合にも、かご型誘導
電動機３を始動することができる。Therefore, it is possible to prevent an abnormal voltage drop of the distribution line and a burnout of the winding due to the generation of an excessive starting current, and to suppress the starting current flowing into the squirrel cage induction motor 3. As a result, even when the direct insertion start is difficult due to the large starting current, the squirrel cage induction motor 3 can be started.
【００１５】その後、かご型誘導電動機３が定格回転数
付近まで到達すれば、始動電流も定格付近にまで降下す
る。これにより、ＰＴＣ抵抗素子４の発熱が減少するた
め、ＰＴＣ抵抗素子４の抵抗値が減少し、電力損失が少
なくなり、かご型誘導電動機３が定格運転できる。After that, when the squirrel-cage induction motor 3 reaches near the rated speed, the starting current also drops near the rated speed. As a result, the heat generation of the PTC resistance element 4 is reduced, the resistance value of the PTC resistance element 4 is reduced, the power loss is reduced, and the squirrel cage induction motor 3 can perform the rated operation.
【００１６】上記のように本実施形態は、かご型誘導電
動機３の一次側巻線と電源開閉器２との間の電路を介し
て流れる始動電流を軽減するため、電路にＰＴＣ抵抗素
子４を直列に挿入接続し、始動電流をこのＰＴＣ抵抗素
子４で限流した後に、かご型誘導電動機３の一次側巻線
に導くようにしたものである。As described above, in this embodiment, in order to reduce the starting current flowing through the electric path between the primary winding of the squirrel-cage induction motor 3 and the power switch 2, the PTC resistance element 4 is provided in the electric path. It is connected in series and the starting current is limited by the PTC resistance element 4 and then guided to the primary winding of the squirrel cage induction motor 3.
【００１７】以上のように構成することにより、かご型
誘導電動機３を始動する際に生じる始動電流を抑制する
ために従来では必要であった切り替え用開閉器や切り替
え制御回路が不要となり、装置の簡略化を図ることがで
きる。更には始動電流を抑制するため、直入れ始動が困
難な場合でも、かご型誘導電動機３を始動できるように
なる。With the above-mentioned structure, the switching switch and the switching control circuit, which have been conventionally required for suppressing the starting current generated when the squirrel cage induction motor 3 is started, are not required, and the apparatus is not required. It is possible to simplify. Further, since the starting current is suppressed, the squirrel-cage induction motor 3 can be started even when it is difficult to perform direct insertion start.
【００１８】実施の形態２．図２はこの発明の実施の形
態２によるかご型誘導電動機の始動装置を示す回路構成
図であり、図において、１は交流電源、２は交流電源１
の開閉を行なうための電源開閉器、３は電力が供給され
ることにより回転動作を行なうかご型誘導電動機、４は
電源開閉器２とかご型誘導電動機３との間に挿入された
ＰＴＣ（ｐｏｓｉｔｉｖｅ ｔｅｍｐｅｒａｔｕｒｅ
ｃｏｅｆｆｉｃｉｅｎｔ）抵抗素子、５は三相リアクト
ルである。本実施形態においては、図４に示された従来
使用されているリアクトル始動方式の回路構成中、電源
開閉器１２からの電力をリアクトル１５へ導く切り替え
用開閉器１４を、ＰＴＣ抵抗素子４に置き替えたもので
ある。Embodiment 2. 2 is a circuit configuration diagram showing a starting device for a squirrel cage induction motor according to Embodiment 2 of the present invention. In the figure, 1 is an AC power source and 2 is an AC power source 1.
A power source switch 3 for opening and closing the electric power is supplied to the squirrel cage induction motor 3 which is rotated by the supply of electric power. A PTC (positive) is inserted between the power switch 2 and the squirrel cage induction motor 3. temperature
Coefficient) resistance element 5 is a three-phase reactor. In the present embodiment, the switching switch 14 for guiding the power from the power switch 12 to the reactor 15 is placed in the PTC resistance element 4 in the circuit configuration of the conventionally used reactor starting method shown in FIG. It has been replaced.
【００１９】上記構成の回路を使用すると、電源開閉器
２を閉じることにより始動電流が流れると、ジュール熱
によりＰＴＣ抵抗素子４が発熱し、同時にその抵抗値が
急激に増加して始動電流を流しにくくする。そのため、
電流はより流れやすい三相リアクトル５へ導かれ、三相
リアクトル５を介してかご型誘導電動機３へ流入し、始
動電流が制限される。その後、かご型誘導電動機３が定
格回転数付近まで到達すれば、始動電流も定格付近にま
で降下する。When the circuit having the above-mentioned configuration is used, when the starting current flows by closing the power switch 2, the Joule heat causes the PTC resistance element 4 to generate heat, and at the same time, the resistance value thereof rapidly increases and the starting current flows. Make it harder. for that reason,
The electric current is guided to the three-phase reactor 5 which is more likely to flow, flows into the squirrel cage induction motor 3 through the three-phase reactor 5, and the starting current is limited. After that, when the squirrel-cage induction motor 3 reaches near the rated speed, the starting current also drops near the rated speed.
【００２０】これにより、ＰＴＣ抵抗素子４の発熱が減
少するため、ＰＴＣ抵抗素子１の抵抗値が減少し、電力
損失がなくなり、電源電圧が直接かご型誘導電動機３に
印加され、かご型誘導電動機３が定格運転できる。した
がって、かご型誘導電動機３に流入する始動電流が抑制
され、始動電流が大きいために直入れ始動が困難な場合
でも、かご型誘導電動機３を起動することができる。し
かも、従来のリアクトル始動方式において不可欠であっ
た、切り替え用開閉器の開閉制御も不要となり、装置を
簡略化することができる。As a result, the heat generation of the PTC resistance element 4 is reduced, the resistance value of the PTC resistance element 1 is reduced, the power loss is eliminated, and the power supply voltage is directly applied to the squirrel cage induction motor 3. 3 can perform rated operation. Therefore, the starting current flowing into the squirrel-cage induction motor 3 is suppressed, and the squirrel-cage induction motor 3 can be started even when direct-starting is difficult due to the large starting current. In addition, the opening / closing control of the switching switch, which is indispensable in the conventional reactor starting method, becomes unnecessary, and the device can be simplified.
【００２１】上記のように本実施形態においては、かご
型誘導電動機のリアクトル始動方式において、かご型誘
導電動機３始動時に、三相リアクトル５ヘ交流電圧の投
入又は遮断を行う開閉器の代わりにＰＴＣ抵抗素子４を
挿入し、かご型誘導電動機３始動時の始動電流を三相リ
アクトル５を介してかご型誘導電動機３へ導くように
し、始動電流抑制後には、三相リアクトル５を介さず、
直接電源開閉器２とかご型誘導電動機３の一次側巻線に
接続するようにしたものである。As described above, in the present embodiment, in the reactor starting method of the squirrel-cage induction motor, the PTC is used instead of the switch for turning on / off the AC voltage to the three-phase reactor 5 when the squirrel-cage induction motor 3 is started. The resistance element 4 is inserted so that the starting current at the time of starting the squirrel cage induction motor 3 is guided to the squirrel cage induction motor 3 via the three-phase reactor 5, and after the starting current is suppressed, the three-phase reactor 5 is not passed.
The power source switch 2 and the squirrel cage induction motor 3 are directly connected to the primary winding.
【００２２】以上のように構成することにより、かご型
誘導電動機３を始動する際に生じる始動電流を抑制する
ために従来では必要であった切り替え用開閉器や切り替
え制御回路が不要となり、装置の簡略化を図ることがで
きる。更には始動電流を抑制するため、直入れ始動が困
難な場合でも、かご型誘導電動機３を始動できるように
なる。With the above-mentioned configuration, the switching switch and the switching control circuit, which have been conventionally required for suppressing the starting current generated when the squirrel cage induction motor 3 is started, become unnecessary, and the apparatus It is possible to simplify. Further, since the starting current is suppressed, the squirrel-cage induction motor 3 can be started even when it is difficult to perform direct insertion start.
【００２３】[0023]
【発明の効果】この発明の請求項１に係るかご型誘導電
動機の始動装置によれば、かご型誘導電動機の一次側巻
線と電源開閉器との間に始動電流を抑制するためのＰＴ
Ｃ抵抗素子を直列接続したので、装置を簡略化すること
ができるとともに、直入れ始動が困難な場合でも、かご
型誘導電動機を起動することができるようになる。According to the squirrel cage induction motor starting device of the first aspect of the present invention, a PT for suppressing the starting current between the primary winding of the squirrel cage induction motor and the power switch.
Since the C resistance elements are connected in series, the device can be simplified and the squirrel-cage induction motor can be started even when the direct insertion start is difficult.
【００２４】この発明の請求項２に係るかご型誘導電動
機の始動装置によれば、かご型誘導電動機の一次側巻線
と電源開閉器との間にＰＴＣ抵抗素子を直列接続すると
ともに、ＰＴＣ抵抗素子に対してリアクトルを並列に接
続したので、従来のリアクトル始動方式において不可欠
であった、切り替え用開閉器の開閉制御が不要となり、
装置全体を簡略化することができる。According to the squirrel cage induction motor starting device of the second aspect of the present invention, the PTC resistance element is connected in series between the primary side winding of the squirrel cage induction motor and the power switch, and the PTC resistance element is connected in series. Since the reactor was connected in parallel to the element, the switching control of the switching switch, which was indispensable in the conventional reactor starting method, became unnecessary,
The entire device can be simplified.
【図１】 この発明の実施の形態１によるかご型誘導電
動機の始動装置を示す回路構成図である。FIG. 1 is a circuit configuration diagram showing a starting device for a squirrel cage induction motor according to a first embodiment of the present invention.
【図２】 この発明の実施の形態２によるかご型誘導電
動機の始動装置を示す回路構成図である。FIG. 2 is a circuit configuration diagram showing a starting device for a squirrel cage induction motor according to Embodiment 2 of the present invention.
【図３】 従来のかご型誘導電動機の始動装置を示す回
路構成図である。FIG. 3 is a circuit configuration diagram showing a conventional squirrel cage induction motor starting device.
【図４】 従来のかご型誘導電動機の始動装置を示す回
路構成図である。FIG. 4 is a circuit configuration diagram showing a conventional squirrel cage induction motor starting device.
２ 電源開閉器、３ かご型誘導電動機、４ ＰＴＣ抵
抗素子、５ リアクトル。2 Power switch, 3 cage type induction motor, 4 PTC resistance element, 5 reactor.
Claims (2)
閉器との間に始動電流を抑制するためのＰＴＣ抵抗素子
を直列接続したことを特徴とするかご型誘導電動機の始
動装置。1. A starting device for a squirrel-cage induction motor, wherein a PTC resistance element for suppressing a starting current is connected in series between a primary side winding of the squirrel-cage induction motor and a power switch.
閉器との間にＰＴＣ抵抗素子を直列接続するとともに、
上記ＰＴＣ抵抗素子に対してリアクトルを並列に接続し
たことを特徴とするかご型誘導電動機の始動装置。2. A PTC resistance element is connected in series between the primary winding of the squirrel-cage induction motor and the power switch, and
A starting device for a squirrel-cage induction motor, characterized in that a reactor is connected in parallel to the PTC resistance element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001378088A JP2003189649A (en) | 2001-12-12 | 2001-12-12 | Starter for cage type induction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001378088A JP2003189649A (en) | 2001-12-12 | 2001-12-12 | Starter for cage type induction motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003189649A true JP2003189649A (en) | 2003-07-04 |
Family
ID=27590841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001378088A Pending JP2003189649A (en) | 2001-12-12 | 2001-12-12 | Starter for cage type induction motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003189649A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008187763A (en) * | 2007-01-26 | 2008-08-14 | Fuji Electric Systems Co Ltd | Method of starting induction motor, and drive circuit |
| CN117318341A (en) * | 2023-11-29 | 2023-12-29 | 山西电机制造有限公司 | Cage rotor structure of three-phase asynchronous motor for reducing starting current and motor |
-
2001
- 2001-12-12 JP JP2001378088A patent/JP2003189649A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008187763A (en) * | 2007-01-26 | 2008-08-14 | Fuji Electric Systems Co Ltd | Method of starting induction motor, and drive circuit |
| CN117318341A (en) * | 2023-11-29 | 2023-12-29 | 山西电机制造有限公司 | Cage rotor structure of three-phase asynchronous motor for reducing starting current and motor |
| CN117318341B (en) * | 2023-11-29 | 2024-03-22 | 山西电机制造有限公司 | Cage rotor structure of three-phase asynchronous motor for reducing starting current and motor |
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