First, the control accuracy is different
The step angle of the two-phase hybrid stepper motor is generally 1.8° and 0.9°, and the step angle of the five-phase hybrid stepper motor is generally 0.72° and 0.36°. There are also some high-performance stepper motors that have a smaller step angle after being subdivided. The control accuracy of the communication servo motor is ensured by a rotary encoder at the rear end of the motor shaft.
Second, the low-frequency characteristics are different
The stepper motor is prone to low-frequency oscillation at low speed. The oscillation frequency is related to the load situation and the function of the driver, and it is generally thought that the oscillation frequency is half of the no-load take-off frequency of the motor. This low-frequency oscillation, which is determined by the operating principle of the stepper motor, is very unpleasant for the normal operation of the machine. When the stepper motor operates at low speed, damping skills should generally be used to overcome the phenomenon of low-frequency oscillation, such as adding dampers to the motor, or subdividing skills on the driver.
The communication servo motor works very smoothly and does not oscillate even at low speeds. The communication servo system has the function of resonance suppression, which can include the lack of mechanical rigidity, and the system has a frequency analysis function (FFT), which can detect the resonance point of the machine, which is convenient for system adjustment.
Third, the moment frequency characteristics are different
The output torque of the stepper motor decreases with the increase of speed, and will drop sharply at higher speed, so its maximum operating speed is generally 300-600RPM. The communication servo motor is a constant torque output, that is, within its extra speed (generally 2000RPM or 3000RPM), it can output additional torque, and it is a constant power output above the additional speed.
Fourth, overload can be different
Stepper motors generally do not have overload capabilities. The communication servo motor has a strong overload ability, and its maximum torque is many times the extra torque, which can be used to overcome the inertia moment of the inertial load at the moment of start-up. Because the stepper motor does not have this overload ability, in order to overcome this inertial torque in the selection, 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, which presents the phenomenon of torque waste.
Fifth, the operation function is different
The control of the stepper motor is open-loop control, the starting frequency is too high or the load is too large, it is easy to show the phenomenon of losing steps or stalling, and the speed is too high when aborting, and it is easy to show the phenomenon of overshoot, so in order to ensure its control accuracy, the problem of rising and decreasing speed should be dealt with. The communication servo drive system is closed-loop control, the driver can directly sample the feedback signal of the motor encoder, and the internal position loop and speed loop are formed, which generally does not present the phenomenon of step loss or overshoot of the stepper motor, and the control function is more reliable.
Sixth, the speed response function is different
The stepper motor needs 200-400 milliseconds to speed up from stopping to working speed (generally hundreds of revolutions per minute). The acceleration function of the communication servo system is better, and it only takes a few milliseconds from stopping to its extra speed, which can be used in the operation occasions that require fast start and stop.
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