First, the control accuracy is different
The step angle of the two-phase hybrid Mitsubishi servo motor is generally 1.8 ° and 0.9 °, and the step angle of the five-phase hybrid Mitsubishi servo motor is generally 0.72 ° and 0.36 °. Mitsubishi servo motors, which are also some functions, have a smaller step angle after segmentation.
The control accuracy of the AC servo motor is ensured by the rotary encoder at the rear of the motor shaft.
Second, the characteristics of low frequency are different
Mitsubishi servo motors are most prone to low-frequency sensations in low-speed gears. The sensation frequency is related to the load situation and the function of the controller, and it is generally believed that the sensation frequency is more than half of the jump frequency of the motor at full load. This kind of low-frequency sensation is determined by the principle of Mitsubishi servo motors, and the planned low-frequency sensation situation is very unfortunate for the normal operation of the equipment. When the Mitsubishi servo motor is working in low gear, the vibration damping technology should generally be used to disconnect the low-frequency sensational situation, such as adding a damper to the motor, or selecting a subdivided technology on the controller.
The AC servo motor runs very stably, and it is not prone to sensational situations even in low gears. The AC servo system has the effect of resonance and deterrence, which can include the stiffness of mechanical equipment, and the system software has a frequency analysis function (FFT), which can detect the resonance point of mechanical equipment, which is conducive to system software conditioning.
Third, the characteristics of moment frequency are different
The output torque of Mitsubishi servo motor decreases with the increase of the speed ratio, and drops sharply when rotating at higher speed, so its maximum working speed ratio is generally 300-600RPM. The AC servo motor is a constant torque output, that is, within its rated speed ratio (generally 2000RPM or 3000RPM), the rated speed ratio can be output, and the rated speed ratio is about the constant output power output.
Fourth, the load can be different
Mitsubishi servo motors generally do not have load capacity. AC servo motors have extremely strong load capabilities. Take the Mitsubishi AC servo system as an example, it has speed load and rotation load ability. Its larger rotation distance is 2 to 3 times the rated rotation distance, and can be used to disconnect the inertial force load from the moment of inertia at the start. Mitsubishi servo motor because there is no such load ability, in order to disconnect this kind of inertia torque when selecting the motor, it is generally necessary to choose a motor with a large rotational distance, and the equipment does not use such a large rotational distance during the normal working period, so there is a situation of extravagant waste of torque.
Fifth, the operation function is different
The operation of Mitsubishi servo motor is an open-loop operation, the starting frequency is too high or the load is too large, it is easy to lose steps or turns, and the speed ratio is too high when terminating, so in order to ensure its control accuracy, it should deal with the problem of lifting and decelerating. The communication servo motor drive system software is the reaction control, the controller can immediately sample the reaction data signal of the motor servo motor, and the internal component ring and speed ring are generally not easy to appear Mitsubishi servo motor loss step or overshoot, and the operation function is more reliable.
Sixth, the speed echo function is different
Mitsubishi servo motor acceleration from stationary to working speed ratio (generally hundreds of revolutions per minute) is necessary for 200-400ms. The acceleration function of the AC servo system is good, taking the AC servo motor as an example, it only takes a few ms to accelerate from stationary to its rated speed ratio of 3000RPM, which can be used for agile start and stop operation occasions under conditions.
Overall, the AC servo system is better than the Mitsubishi servo motor in many functional areas. However, in some occasions where the conditions are too low, Mitsubishi servo motors are often used to implement motors. Therefore, in the planning process of the control system, it is necessary to fully consider the operating conditions, costs and other factors, and adopt the appropriate operating motor.
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