Description
Motor Spec: A06B-0272-B605 Brand: Fanuc Model: AIS40/4000 Motor Type: AC Servo Output: 5.5kW Speed: 3000RPM Voltage: 204V Frequency: 200Hz Phase: 3 Amps: 7.9A
The basic structure of AC servo motor is similar to that of AC induction motor (asynchronous motor). The excitation winding Wf and the control winding WcoWf, which have two phase space displacement angles of 90° on the stator, are connected with constant AC voltage, and the AC voltage or phase change applied to the Wc is used to control the operation of the motor. Ac servo motor has the characteristics of stable operation, good controllability, fast response, high sensitivity, and strict nonlinearity index of mechanical characteristics and adjustment characteristics (requirements are less than 10% ~ 15% and less than 15% ~ 25%, respectively).
The basic structure of DC servo motor is similar to that of general DC motor. Motor speed n=E/K1j=(UA-IARA)/K1j, where E is the armature back electromotive force, K is a constant, j is the magnetic flux per pole, Ua, Ia are the armature voltage and armature current, Ra is the armature resistance, change Ua or change φ, can control the DC servo motor speed, but generally use the method of controlling the armature voltage, In a permanent magnet DC servomotor, the field winding is replaced by a permanent magnet with a constant flux φ. Dc servo motor has good linear adjustment characteristics and fast time response.
Principle of servo motor The stator structure of AC servo motor is basically similar to that of capacitive split phase single-phase asynchronous motor. The stator is equipped with two windings with a position difference of 90°, one is the excitation winding Rf, which is always connected to the AC voltage Uf; The other is the control winding L, which is connected to the control signal voltage Uc. So AC servo motor is also called two servo motors. The rotor of the AC servo motor is usually made of squirrel cage, but in order to make the servo motor have a wide speed range, linear mechanical characteristics, no "rotation" phenomenon and fast response performance, it should have the rotor resistance and small moment of inertia compared with ordinary motors. At present, there are two types of rotor structures widely used: one is the squirrel cage rotor with high resistivity guide bar made of conductive material with high resistivity. In order to reduce the moment of inertia of the rotor, the rotor is made slender; The other is a hollow cup-shaped rotor made of aluminum alloy, the cup wall is only 0.2-0.3mm, the moment of inertia of the hollow cup-shaped rotor is very small, the reaction is rapid, and the operation is smooth, so it is widely used.
When the AC servo motor has no control voltage, only the pulsating magnetic field generated by the excitation winding is in the stator, and the rotor is stationary. When there is a control voltage, a rotating magnetic field is generated in the stator, the rotor rotates in the direction of the rotating magnetic field, in the case of constant load, the speed of the motor changes with the size of the control voltage, when the phase of the control voltage is opposite, the servo motor will reverse.
Although the working principle of AC servo motor is similar to that of capacitance-operated single-phase asynchronous motor, the rotor resistance of the former is much larger than that of the latter, so the servo motor has three significant characteristics compared with the capacitance-operated asynchronous motor:
1, the starting torque is large: because the rotor resistance is large, the torque characteristics (mechanical characteristics) are closer to linear, and it has a large starting torque. Therefore, when the stator has a control voltage, the rotor rotates immediately, that is, it has the characteristics of fast start and high sensitivity.
2, wide operating range: smooth operation, low noise. [/p][p=30, 2, left]3, no rotation phenomenon: the servo motor in operation, as long as the control voltage is lost, the motor will stop running immediately.
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