The configuration of the AC servo motor stator is basically similar to that of a capacitive split phase single-phase asynchronous motor. The stator is provided with two windings with 90° difference between each other, one is the field winding Rf, which is always connected to the AC voltage Uf; the other is It is the control winding L, which is connected to the control signal voltage Uc. Therefore, the AC servo motor is also called two servo motors. The rotor of the AC servo motor is usually made into a squirrel cage type, 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 a rotor resistance compared with a normal motor. The two characteristics of large sum of inertia are small. At present, there are two forms of rotor structures that are widely used: one is a squirrel-cage rotor made of a high-resistivity conductive material made of a high-resistivity conductive material, and the rotor is made slender in order to reduce the moment of inertia of the rotor; One is a hollow cup rotor made of aluminum alloy, the cup wall is very thin, only 0.2-0.3mm. In order to reduce the magnetic resistance of the magnetic circuit, a fixed inner stator is placed in the hollow cup rotor, and a hollow cup shape The rotor has a large moment of inertia, a fast response, and a smooth operation, so it is widely used. When there is no control voltage in the AC servo motor, only the pulsating magnetic field generated by the field winding is present 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 rotational speed of the motor varies with the magnitude of the control voltage. When the phase of the control voltage is opposite, the servo motor Will reverse. The working principle of the AC servo motor is similar to that of the split-phase single-phase asynchronous motor, but the rotor resistance of the AC servo motor is much larger than that of the split-phase single-phase asynchronous motor, so the servo motor has three significant compared with the single-phase asynchronous motor. Features: 1. The starting torque is large. Due to the large rotor resistance, there is a clear difference compared with the torque characteristic curve of the ordinary asynchronous motor. It can make the critical slip S0>1, which not only makes the torque characteristic closer to linear, but also has a larger starting torque. Therefore, when the stator has a control voltage, the rotor immediately rotates, that is, it has the characteristics of quick start and high sensitivity. 2. The servo motor with a wide operating range and no normal rotation operation will stop the motor as soon as the control voltage is lost. When the servo motor loses the control voltage, it is in single-phase operation. Due to the large rotor resistance, the two rotating torques in the opposite direction of the stator and the two torque characteristics generated by the rotor and the combined torque characteristics of the AC servo motor The output power is generally 0.1-100W. When the power frequency is 50Hz, the voltage is 36V, 110V, 220, 380V; when the power frequency is 400Hz, the voltage is 20V, 26V, 36V, 115V and so on. The AC servo motor runs smoothly and has low noise. However, the control characteristics are non-linear, and because of the large rotor resistance, large loss, and low efficiency, it is bulky and heavy compared with the same capacity DC servo motor, so it is only suitable for small power control systems of 0.5-100W. The main advantages of the permanent magnet AC servo motor are as follows: 1. No brush and commutator, so the work is reliable and the maintenance and maintenance requirements are low. 2. The stator winding heat dissipation is convenient. 3, small inertia, easy to improve the speed of the system. 4, adapted to high speed and large torque working conditions. 5. It has a small volume and weight under the same power. ----- Responsible Editor: Dalan Oil Pump Motor 02- Purchasing Consultant Copyright http:/(Dalan Motor) Reprint, please indicate the source http://news.chinawj.com.cn
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