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2023
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Comparison between servo motor and single-phase asynchronous motor
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Although the working principle of the AC servo motor is similar to that of the split-phase single-phase asynchronous motor, the rotor resistance of the former is much larger than that of the latter. Therefore, compared with the single-machine asynchronous motor, the servo motor has three salient features:
Although the working principle of the AC servo motor is similar to that of the split-phase single-phase asynchronous motor, the rotor resistance of the former is much larger than that of the latter. Therefore, compared with the single-machine asynchronous motor, the servo motor has three salient features:
1. Large starting torque
Due to the large rotor resistance, it is obviously different from the torque characteristic curve of ordinary asynchronous motors. It can make the critical slip rate S0>1, which not only makes the torque characteristic (mechanical characteristic) closer to linear, but also has a larger starting torque. Therefore, when the stator has a control voltage, the rotor rotates immediately, which has the characteristics of fast starting and high sensitivity.
2. Wide operating range
3. No rotation phenomenon
For a servo motor in normal operation, as long as the control voltage is lost, the motor will stop running immediately. When the servo motor loses the control voltage, it is in a single-phase operation state. Due to the large resistance of the rotor, the two torque characteristics (T1-S1, T2-S2 curves) generated by the two rotating magnetic fields rotating in opposite directions in the stator and the action of the rotor ) and synthetic torque characteristics (T-S curve)
The output power of AC servo motor is generally 0.1-100W. When the power frequency is 50Hz, the voltages are 36V, 110V, 220, 380V; when the power frequency is 400Hz, the voltages are 20V, 26V, 36V, 115V and so on.
The AC servo motor runs smoothly with low noise. But the control characteristic is non-linear, and because the rotor resistance is large, the loss is large, and the efficiency is low, compared with the DC servo motor of the same capacity, it is bulky and heavy, so it is only suitable for small power control systems of 0.5-100W.
AC servo motor,Split-phase single-phase asynchronous motor
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