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 are also smaller in some functions according to the segmentation. For example, the step angle of the two-phase hybrid Mitsubishi servo motor produced by Sanyo Company (SANYO DENKI) can be set to 1.8 °, 0.9 °, 0.72 °, 0.36 °, 0.18 °, 0.09 °, 0.072 ° and 0.036 ° according to the DIP switch, which is suitable for the step angle of the two-phase and five-phase hybrid Mitsubishi servo motor.
The control accuracy of the communication servo motor is guaranteed by the rotary encoder at the rear end of the motor shaft. Taking the Sanyo all-digital communication servo motor as an example, for the motor with a standard 2000-wire servo motor, the single pulse equivalent is 360°/8000=0.045° because of the four-optical lens technology selected inside the controller. For a motor with a 17-bit servo motor, the controller receives 131072 single pulse motor for a full revolution, that is, its single pulse equivalent is 360°/131072=0.0027466°, which is 1/655 of the single pulse equivalent of the Mitsubishi servo motor with a step angle of 1.8°.
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 planned by the principle of Mitsubishi servo motors 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 communication servo motor runs very smoothly and is not prone to sensational situations even in low gears. The communication servo system has a resonance deterrent effect, which can include the insufficient stiffness of the mechanical equipment, and the system software has a frequency analysis function (FFT), which can detect the resonance point of the mechanical equipment, which is conducive to the adjustment of the system software.
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 communication servo motor is a constant torque output, that is, within its rated speed ratio (generally 2000RPM or 3000RPM), the rated value of the speed ratio can be output, and the rated speed ratio is around the constant output power output.
Fourth, the load can be different
Mitsubishi servo motors generally do not have load capacity. The communication servo motor has a strong load capacity. Taking the Sanyo communication servo system as an example, it has speed load and rotation load ability. Its larger rotation distance is two to three times the rated rotation distance, and can be used to disconnect the inertial force load from the moment of inertia at the moment of starting. Because Mitsubishi servo motor does not have this kind of load ability, in order to disconnect this kind of inertia torque when selecting the motor, it is generally necessary to select a motor with a large rotation distance, and the equipment does not have to have such a large rotation 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. Communication servo motor drive system software for feedback control, the controller can immediately sample the feedback data signal of the motor servo motor, the internal component ring and speed ring, generally not easy to appear Mitsubishi servo motor lost step or overshoot, the operation function is more reliable.
Sixth, the speed response function is not the same
Mitsubishi servo motor from stationary to working speed ratio (generally hundreds of revolutions per minute) is necessary for 200-400ms. Taking the SANYO 400W communication 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.
Overall, the communication 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 design 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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