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2023

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02

AC servo motor

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The structure of the stator of the AC servo motor is basically similar to that of the capacitor phase-splitting single-phase asynchronous motor. The stator is equipped with two windings with a mutual difference of 90°, one is the excitation winding Rf, which is always connected to the AC voltage Uf; the other is Is the control winding L, connected to the control signal voltage Uc. So the AC servo motor is also called two servo motors.

The structure of the stator of the AC servo motor is basically similar to that of the capacitor phase-splitting single-phase asynchronous motor. The stator is equipped with two windings with a mutual difference of 90°, one is the excitation winding Rf, which is always connected to the AC voltage Uf; the other is Is the control winding L, connected to the control signal voltage Uc. So the AC servo motor is also called two servo motors.

The rotor of the AC servo motor is usually made into a squirrel cage, but in order to make the servo motor have a wide speed range, linear mechanical characteristics, no "autorotation" phenomenon and fast response performance, compared with ordinary motors, it should have The rotor resistance is large and the moment of inertia is small. There are two types of rotor structures that are widely used: one is the squirrel-cage rotor with high-resistivity guide bars made of high-resistivity conductive materials. In order to reduce the moment of inertia of the rotor, the rotor is made slender; The first is a hollow cup-shaped rotor made of aluminum alloy. The cup wall is very thin, only 0.2-0.3mm. In order to reduce the reluctance of the magnetic circuit, a fixed inner stator should be placed in the hollow cup-shaped rotor. The hollow cup-shaped rotor The moment of inertia is small, the response is fast, and the operation is smooth, so it is widely used.

When the AC servo motor has no control voltage, there is only the pulsating magnetic field generated by the excitation winding in the stator, and the rotor is stationary. When there is a control voltage, a rotating magnetic field is generated in the stator, and the rotor rotates in the direction of the rotating magnetic field. When the load is constant, the speed of the motor changes with the magnitude of the control voltage. When the phase of the control voltage is opposite, the servo motor will be reversed.

AC servo motor,capacitance