Xizang Siemens servo motor maintenance and replacement encoder fault - can be repaired the same day

Xizang Siemens servo motor maintenance and replacement encoder failure - can be repaired the same day,Basic information

So AC servo motors are also known as two servo motors. The rotor of AC servo motors is usually made into a squirrel cage, but in order to make the servo motor have a wide speed range and linear mechanical characteristics, there is noCompared with ordinary electric motors, it should have the characteristics of high rotor resistance and low moment of inertia due to the phenomenon of "self rotation" and fast response performance. There are two forms of rotor structures that are widely used: one is a squirrel cage rotor made of high resistivity conductive materials with high resistivity bars. In order to reduce the rotational inertia of the rotor, the rotor is made slender; Another type is a hollow cup-shaped rotor made of aluminum alloy, with a very thin cup wall0.2-0.3mmIn order to reduce the magnetic resistance of the magnetic circuit, a fixed stator should be placed inside the hollow cup-shaped rotor.Hollow cup-shaped rotors have a small moment of inertia, rapid response, and smooth operation, making them widely used. When there is no control voltage, only the pulsating magnetic field generated by the excitation winding is present in the stator of the AC servo motor, and the rotor remains stationary. When there is a control voltage, a rotating magnetic field is generated inside the stator, and the rotor rotates in the direction of the rotating magnetic field. Under constant load, the 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.

Xizang Siemens servo motor maintenance and replacement encoder fault - can be repaired the same dayTechnical specifications

SIEMENSThe working principle of servo motors is similar to that of phase separated single-phase asynchronous motors, but the rotor resistance of the former is much larger than that of the latter. Therefore, compared with single machine asynchronous motors, servo motors have three significant characteristics:

1Due to the high resistance of the rotor, the starting torque is large, and its torque characteristic curve is shown in the figure3Medium curve1As shown, the torque characteristic curve is different from that of a regular asynchronous motor2Compared to others, there is a clear difference. It can increase the critical slip rateS0>1This not only makes the torque characteristics (mechanical properties) closer to linearity, but also has a larger starting torque. Therefore, when the stator has a control voltage, the rotor immediately rotates, which has the characteristics of fast starting and high sensitivity.

2Wide operating range

3A servo motor that operates normally without self rotation will immediately stop running as soon as the control voltage is lost. When the servo motor loses control voltage, it operates in a single-phase state. Due to the high resistance of the rotor, the two rotating magnetic fields in opposite directions in the stator interact with the two torque characteristics generated by the rotor（T1－S1TheT2－S2Curve and synthetic torque characteristics（T－SCurve)

The output power of an AC servo motor is generally0.1-100WWhen the power frequency is50HzThe voltage has36VThe110V、220The380VWhen the power frequency is400HzThe voltage has20VThe26VThe36VThe115VWaiting for various.

The communication servo motor runs smoothly and has low noise. However, the control characteristics are nonlinear, and due to the high rotor resistance, large losses, and low efficiency, compared with DC servo motors of the same capacity, they are bulky and heavy, so they are only suitable for0.5-100WThe low-power control system.
Introduction to Other Electricians and Electronics:
Communication contactors, especially electromagnetic contactors, are a very common and commonly used electrical control device in our electrical work. As for its working principle and structural characteristics, I believe that many colleagues are quite familiar with it. However, during use, some people may not have noticed a phenomenon - in AC contactors with contact capacities below 60A, the working power supply of the suction coil is mostly directly from AC power (commonly seen in three voltage levels: AC380V, 220V, and 36V); Once the contact capacity of the contactor exceeds 60A, the working power supply of its suction coil mostly becomes DC form (although it also introduces AC power supply, it has been converted by rectification circuit).