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A06B-0502-B068#7000 FANUC Motor AC servo

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

 

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Categories: , SKU: A06B-0502-B068#7000

Description

Overview

Essential details：A06B-0502-B068#7000 FANUC Motor AC servo

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.

A06B-0502-B068#7000

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sunny  He

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A06B-0502-B068#7000 FANUC Motor AC servo

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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