A06B-0502-B068 交流伺服MDL 20

b068 #7000 FANUC電機(jī)交流伺服
制造商:發(fā)那科
模型(s): a06b – 0502 b068 # 7000
附加信息:電機(jī)交流伺服
預(yù)計運(yùn)輸規(guī)模
外形尺寸:263 × 58 × 28mm
重量:.4.3公斤
原產(chǎn)國:美國

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描述

A06B-0502-B068 交流伺服MDL 20

b068 #7000 FANUC電機(jī)交流伺服
制造商:發(fā)那科
模型(s): a06b – 0502 b068 # 7000
附加信息:電機(jī)交流伺服
預(yù)計運(yùn)輸規(guī)模
外形尺寸:263 × 58 × 28mm
重量:.4.3公斤
原產(chǎn)國:美國

交流伺服電機(jī)在結(jié)構(gòu)上與單相異步電機(jī)相似,其定子鐵芯上放置有一個空間差為90°電角的兩相繞組。一種是磁場繞組,另一種是控制繞組。電動機(jī)工作時,勵磁繞組接單相交流電壓,控制繞組接控制信號電壓,要求兩相電壓頻率相同。

交流伺服電機(jī)的轉(zhuǎn)子有兩種結(jié)構(gòu)形式。一種是籠型轉(zhuǎn)子,它類似于普通三相異步電動機(jī)的籠型轉(zhuǎn)子,但形狀更細(xì)長,減小了轉(zhuǎn)子的轉(zhuǎn)動慣量,降低了電動機(jī)的機(jī)電時間常數(shù)?;\式轉(zhuǎn)子交流伺服電機(jī)體積大,氣隙小,所需勵磁電流小,功率因數(shù)高,電機(jī)的機(jī)械強(qiáng)度大,但快速響應(yīng)性能略差,低速運(yùn)行不夠平穩(wěn)。

另一種是無磁空心杯形轉(zhuǎn)子,該轉(zhuǎn)子采用杯形結(jié)構(gòu)制成,為了減少氣隙,在杯形轉(zhuǎn)子中有一個內(nèi)部定子,內(nèi)部定子不設(shè)置在繞組上,只起磁性作用,轉(zhuǎn)子由鋁或鋁合金制成,杯壁厚度為0.2~0.8mm,轉(zhuǎn)動慣量小而具有較大的阻力。空心杯轉(zhuǎn)子交流伺服電機(jī)具有響應(yīng)快、運(yùn)行平穩(wěn)等優(yōu)點(diǎn),但其結(jié)構(gòu)復(fù)雜,氣隙大,負(fù)載電流大,功率因數(shù)低。

在交流伺服電機(jī)中,除了要求電機(jī)不能“旋轉(zhuǎn)”外,還要求改變施加在控制繞組上的電壓的大小和相位,以改變電機(jī)轉(zhuǎn)速的大小和方向。

根據(jù)旋轉(zhuǎn)磁動勢理論,勵磁繞組與控制繞組相互作用產(chǎn)生旋轉(zhuǎn)磁場,旋轉(zhuǎn)磁場的方向由相位超前繞組變?yōu)橄辔谎舆t繞組。改變控制繞組中控制電壓的相位,可以改變兩相繞組的超前滯后關(guān)系,從而改變旋轉(zhuǎn)磁場的旋轉(zhuǎn)方向,交流伺服電機(jī)的速度方向也會發(fā)生變化。改變控制電壓的大小和相位,可以改變旋轉(zhuǎn)磁場的磁通,從而改變電機(jī)的電磁轉(zhuǎn)矩,交流伺服電機(jī)的轉(zhuǎn)速也會發(fā)生變化。

交流電動機(jī)的調(diào)速方法包括幅值控制、相位控制和幅值相位控制。

(1)幅值控制是通過改變控制電壓Uc的幅值來控制電機(jī)的轉(zhuǎn)速,且Uc的相位始終不變,使控制電流Ic與勵磁電流If保持90°電角的相位關(guān)系。如果Uc=0,則轉(zhuǎn)速為0,電機(jī)停止。

(2)相位控制是通過改變控制電壓Uc的相位來控制電機(jī)的轉(zhuǎn)速,從而改變控制電流Ic與勵磁電流If之間的相角,此時控制電壓Uc的大小保持不變。當(dāng)兩相電流Ic與If相角為0°時,轉(zhuǎn)速為0,電機(jī)停止。

(3)幅相控制是指通過同時改變控制電壓Uc的幅值和Ic與If之間的相位角來控制電機(jī)的轉(zhuǎn)速。具體方法是將移相電容C串入勵磁繞組回路,接穩(wěn)壓器U1,則勵磁繞組上的電壓Uf = U1- uef。在控制繞組中加入與U1相同的控制電壓Uc,當(dāng)改變控制電壓Uc的幅值來控制電機(jī)轉(zhuǎn)速時,由于轉(zhuǎn)子繞組與勵磁繞組之間存在耦合,勵磁繞組的電流If也會隨著轉(zhuǎn)速的變化而變化,勵磁繞組兩端的電壓Uf和電容C上的電壓Uef也會隨之變化。這種Uc幅值的變換改變了Uc和Uf的幅值,以及它們與對應(yīng)電流的相位角。
在三種控制方法中,雖然幅相控制的機(jī)械特性和調(diào)節(jié)特性最差,但由于該方法使用的控制設(shè)備簡單,不需要移相裝置,因此應(yīng)用最為廣泛。

A06B-0502-B068 交流伺服MDL 20

A06B-0502-B068#7000 FANUC Motor AC servo
Manufacturers :FANUC
Model(s)? :A06B-0502-B068#7000
Additional Information :Motor AC servo
Estimated Shipping Size
Dimensions: 263 × 58 × 28mm
Weight:.4.3?kg
Country of Origin: United States of America

The AC servo motor is similar in structure to a single-phase asynchronous motor, and its stator core is placed with a two-phase winding with a space difference of 90° electrical Angle. One is the field winding and the other is the control winding. When the motor is working, the excitation winding is connected to the single-phase AC voltage, and the control winding is connected to the control signal voltage, and the two phase voltages are required to be of the same frequency.

The rotor of AC servo motor has two structural forms. One is the cage rotor, which is similar to the cage rotor of the ordinary three-phase asynchronous motor, but it is more slender in shape, which reduces the moment of inertia of the rotor and reduces the electromechanical time constant of the motor. The cage-rotor AC servo motor is large, the air gap is small, the required excitation current is small, the power factor is high, the mechanical strength of the motor is large, but the fast response performance is slightly poor, and the low speed operation is not smooth enough.

The other is a non-magnetic hollow cup-shaped rotor, the rotor is made of a cup-shaped structure, in order to reduce the air gap, there is an internal stator in the cup-shaped rotor, the internal stator is not set on the winding, only plays a magnetic role, the rotor is made of aluminum or aluminum alloy, the cup wall thickness of 0.2~0.8mm, the moment of inertia is small and has a large resistance. Hollow cup rotor AC servo motor has the advantages of fast response and smooth operation, but it has complex structure, large air gap and large load current, and low power factor.

In an AC servo motor, in addition to the requirement that the motor cannot “rotate”, it is also required to change the size and phase of the voltage applied to the control winding to change the size and direction of the motor speed.

According to the theory of rotating magnetomotive force, a rotating magnetic field is produced by the interaction of the exciting winding and the control winding, and the direction of the rotating magnetic field is changed from the phase advanced winding to the phase delayed winding. Changing the phase of the control voltage in the control winding can change the lead-lag relationship of the two-phase winding, so as to change the rotation direction of the rotating magnetic field, and the speed direction of the AC servo motor will also change. Changing the size and phase of the control voltage can change the flux of the rotating magnetic field, thus changing the electromagnetic torque of the motor, and the speed of the AC servo motor will also change.

The speed control methods of AC motor include amplitude control, phase control and amplitude phase control.

(1) Amplitude control is to control the speed of the motor by changing the amplitude of the control voltage Uc, and the phase of Uc is always unchanged, so that the control current Ic and the excitation current If maintain the phase relationship of 90° electrical Angle. If Uc=0, the speed is 0 and the motor stops.

(2) Phase control is to control the speed of the motor by changing the phase of the control voltage Uc, so as to change the phase Angle between the control current Ic and the excitation current If, in this case, the size of the control voltage Uc remains unchanged. When the phase Angle between the two-phase current Ic and If is 0°, the speed is 0 and the motor stops.

(3) Amplitude and phase control means to control the speed of the motor by simultaneously changing the amplitude of the control voltage Uc and the phase Angle between Ic and If. The specific method is to string a phase-shifting capacitor C into the excitation winding loop, and then connect to the voltage regulator U1, then the voltage Uf on the excitation winding = U1-UEF. The same control voltage Uc as U1 is added to the control winding, then when the amplitude of the control voltage Uc is changed to control the motor speed, due to the coupling between the rotor winding and the excitation winding, the current If of the excitation winding will also change with the change of the speed, and the voltage Uf at both ends of the excitation winding and the voltage Uef on the capacitor C will also change. Such transformation of Uc amplitude changes the amplitude of Uc and Uf, as well as the phase Angle between them and the corresponding current.
Among the three control methods, although the mechanical and regulatory characteristics of amplitude-phase control are the worst, it is the most widely used because of the simple control equipment used in this method and the absence of phase shifting devices.

 

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