Performance Comparison of Servo Motors and Stepper Motors

As an open-circle control system, the stepper motor has an essential connection with ultramodern digital control technology. In domestic digital control systems, stepper motors are extensively used. With the emergence of all-digital AC servo systems, AC Servo Motors are decreasingly used in digital control systems. To acclimatize to the development trend of digital control, stepper motors or each- digital AC Servo Motors are substantially used as administrative motors in stir control systems. Although both are analogous in control mode( palpitation train and direction signal), there are big differences in performance and operation occasions. Now compare the performance of the two. Next, let's take a look at the performance comparison between accurate rotation angle and speed control and speed control and stepper motors.

This's the content list:

l The control delicacy is different.

l Low-frequence characteristics are different

l The necklace-frequency characteristics are different.

l Different Load capacity.

l Different performance.

l Different speed response performance.

The control delicacy is different.

The step angles of two-phase mongrel stepper motors are generally 1.8° and 0.9°, and the step angles of five-phase mongrel stepper motors are generally 0.72° and 0.36°. There are also some high-performance stepper motors with lower step angles after the branch. For illustration, the step angle of the two-phase mongrel stepping motor can be set to 1.8°, 0.9°, 0.72°, 0.36°, 0.18°, 0.09°, 0.072°, 0.036°  through the law switch, compatible with two-phase and five- phase The step angle of the mongrel stepper motor. The control delicacy of AC Servo Motors is guaranteed by the rotary encoder at the hinder end of the motor shaft. Take Sanyo full-digital AC Servo Motors as an illustration. For a motor with a standard 2000- line encoder, the palpitation fellow is 360°/8000=0.045° due to the quadruple frequency technology inside the motorist. For a motor with a 17- bit encoder, every time the motorist receives 131072 beats, the motor makes one revolution, that is, its palpitation fellow is 360°/131072=0.0027466°, which is the palpitation fellow of a stepping motor with a step angle of1.8 °1/655.

Low-frequence characteristics are different

Stepper motors are prone to low-frequency climate at low pets. The vibration frequency is related to the cargo condition and the performance of the motorist. It's generally believed that the vibration frequency is half of the no-cargo take-off frequency of the motor. This low-frequency vibration miracle determined by the working principle of the stepping motor is veritably inimical to the normal operation of the machine. When the stepper motor works at low speed, damping technology should generally be used to overcome the low-frequency vibration miracle, similar to adding a mute to the motor, or using branch technology on the motorist, etc. The AC Servo Motors run veritably easily and there's no vibration miracle indeed at low pets. The AC servo system has a resonance repression function, which can cover the lack of severity of the machine, and the system has a frequency analysis function inside the system, which can descry the resonance point of the machine and grease system adaptation.

The necklace-frequency characteristics are different.

The affair necklace of the stepper motor decreases with the increase of the speed, and it'll drop sprucely at an advanced speed, so it’s outside working speed is generally 300- 600RPM. AC electromechanical device has a constant necklace affair, that is, they can affair rated necklace within their rated speed (generally 2000RPM or 3000RPM), and they can affair constant power above the rated speed.

Different Load capacity.

Stepper motors generally do not have overload capability. AC Servo Motors have strong overload capability. Taking the AC servo system as an example, it has speed overload and torque overload capabilities. 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. Since the stepper motor does not have this kind of overload capacity, to overcome this moment of inertia when selecting a model, it is often necessary to choose a motor with a larger torque. However, the machine does not need such a large torque during normal operation, so the phenomenon of torque and waste occurs.

Different performance.

The control of the stepping motor is an open-circle control. However, step loss or stalling will fluently do, If the starting frequency is too high or the cargo is too large. When the speed is too high, overrunning will fluently do. Thus, to ensure its control delicacy, it should be handled duly. The speed up and down the speed of the rotary actuator. The AC servo drive system is unrestricted-circle control. The drive can directly test the feedback signal of the motor encoder, and the internal position circle and speed circle are formed. Generally, there will be no stop loss or overshoot of the stepping motor, and the control performance is more dependable.

Different speed response performance.

It takes 200- 400 milliseconds for a stepper motor to accelerate from a deadlock to a working speed. The AC servo system has better acceleration performance. Taking 400W AC Servo Motors as an illustration, it only takes many milliseconds to accelerate from static to its rated speed of 3000RPM, which can be used in control occasions that bear a fast launch and stop.

To add up, the AC servo system is superior to the stepper motor in numerous aspects of performance. But in some lower demanding occasions, stepper motors are frequently used as administrative motors. thus, in the design process of the control system, colorful factors similar to control conditions and cost should be considered exhaustively, and an applicable control motor should be named. Our sanctioned website is https//plc-xbmall.com/. If you are engaged in work related to High performance, efficiency, and superior control of brushless DC servo motors or want to know more about our company, you can communicate with us on the website.