What Should Be Paid Attention to When Choosing Mitsubishi Servo Motors?

As an open-loop control system, Mitsubishi servo motor has an essential connection with modern digital control technology. In the current domestic digital control system, Mitsubishi servo motors are widely used. With the advent of all-digital AC servo systems, AC servo motors are increasingly used in digital control systems. How to choose Mitsubishi servo motor product? What should be paid attention to when choosing Mitsubishi servo motor parts?

1. Different control accuracy

The step angle of the two-phase hybrid servo motor is generally 1.8°, 0.9°, and the step angle of the five-phase hybrid servo motor is generally 0.72°, 0.36°. There are also some high-performance servo motors with smaller step angles after subdividing. For example, the step angle of the two-phase hybrid Mitsubishi servo motor produced by Sanyo Denki can be set to 1.8°, 0.9°, 0.72°, 0.36°, 0.18°, 0.09°, 0.072°, 0.036° through the DIP switch , which is compatible with the step angle of two-phase and five-phase hybrid servo motors.

2. Different low frequency characteristics

Mitsubishi servo motors are easy to appear low-frequency vibration at low speeds. Usually the vibration frequency caused by the load condition and the drive performance is half of the no-load take-off frequency of the motor. This kind of low-frequency vibration, which is determined by the working principle of Mitsubishi servo motors, is very unfavorable to the normal operation of the machine. When Mitsubishi servo motors work at low speeds, damping technology should generally be used to overcome low-frequency vibration phenomena, such as adding a damper to the motor, or using subdivision technology on the drive.

The AC servo motor equipment runs very smoothly, and there is no vibration even at low speeds. The AC servo system has a resonance suppression function, which can cover the lack of rigidity of the machine, and the internal frequency analysis function of the system can detect the resonance point of the machine, which is convenient for system adjustment.

3.  Different moment frequency characteristics

The output torque of the Mitsubishi servo motor decreases with the increase of the speed, and will drop sharply at higher speeds, so its maximum working speed is generally 300-600RPM. The AC servo motor has a constant torque output, that is to say, it can output a rated torque within its rated speed (generally 2000RPM or 3000RPM), and it is a constant power output above the rated speed.

4. Different overload capacity

Mitsubishi servo motors generally do not have overload capacity. AC servo motor devices have strong overload capacity. Take Sanyo AC servo system as an example, it has speed overload and torque overload capability. Its maximum torque is two to three times the rated torque, which can be used to overcome the moment of inertia of the inertial load at the moment of starting. Because Mitsubishi servo motors do not have this overload capacity, in order to overcome this moment of inertia when selecting a model, it is often necessary to select a motor with a larger torque, and the machine does not need such a large torque during normal operation, so the phenomenon of a torque waste appears.