Servo motor (servo motor) is an engine that controls the operation of mechanical components in a servo system.
It is an auxiliary motor indirect transmission. Servo motor can make control speed and position accuracy very accurate.
The voltage signal can be converted into torque and speed to drive the control object.
Permanent magnet AC servo motor compared with DC servo motor, the main advantages are:
(1) No brush and commutator, so the work is reliable and the requirements for maintenance and maintenance are low.
(2) The stator winding heat dissipation is more convenient.
(3) Small inertia, easy to improve the rapidity of the system.
(4) Adapt to high speed and high torque working conditions.
(5) Smaller volume and weight at the same power.
Comparison of servo motor and single-phase asynchronous motor
Although the working principle of AC servo motor is similar to that of split-phase 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 single-motor asynchronous motor:
1, starting torque
Due to the large rotor resistance, there is a clear difference from the torque characteristic curve of an ordinary asynchronous motor. It can make the critical slip S0 > 1, which not only makes the torque characteristics (mechanical characteristics) more linear, but also has a larger starting torque. Therefore, when the stator has a control voltage, the rotor rotates immediately, which means that it has a quick start and high sensitivity.
2, a wide range of operations
3, no rotation phenomenon
In the normal operation of the servo motor, as soon as the control voltage is lost, the motor immediately stops operating. When the servo motor loses the control voltage, it is in a single-phase operation state. Due to the large rotor resistance, two torque characteristics (T1-S1, T2-S2 curve) generated by the rotating magnetic field and the rotor acting in two opposite directions in the stator ) and the resultant torque characteristics (T-S curve) AC servo motor output power is generally 0.1-100W. When the power supply frequency is 50Hz, the voltage is 36V, 110V, 220, 380V; when the power supply frequency is 400Hz, the voltage has 20V, 26V, 36V, 115V and so on.
The AC servo motor runs smoothly and with low noise. However, the control characteristics are non-linear, and because the rotor resistance is large, the loss is large and the efficiency is low. Therefore, compared with the DC servo motor with the same capacity, it is large and heavy, so it is only suitable for a low-power control system of 0.5-100W.
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