stepper motors suppliers tells you the difference between stepper motor and Servo Motor
The difference between stepper motor and Servo motor lies in: 1, the control accuracy is different. The more phase number and beat number of stepping motor, the higher its accuracy, servo motor block from the encoder, encoder scale more, the higher the accuracy. 2. Control Mode Is Different; one is open loop control, the other is closed loop control. 3. The low frequency characteristic is different, the stepping motor is easy to appear the low frequency vibration phenomenon when the low speed, when it works in the low speed, generally uses the damping technology or the subdivision technology to overcome the low frequency vibration phenomenon, the servo motor operates very smoothly There is no vibration even at low speed. AC servo system has the function of Resonance Suppression, which can cover the lack of mechanical rigidity, and the system has the frequency analysis function FFT, which can detect the resonance point of the machine for the convenience of system adjustment. 4. Different torque-frequency characteristics, the output torque of stepping motor will decrease with the speed increasing, AC servo motor is constant torque output, 5. Overload capacity is different, stepping motor generally does not have overload capacity, the AC motor has a strong overload capacity. 6. Different running performance: The stepper motor is controlled by open loop, the starting frequency is too high or the load is too large, it is easy to lose step or stop up, and the overshoot occurs when the speed is too high, the AC servo drive system is controlled by closed loop The driver can directly sample the feedback signal of the motor encoder. The position loop and the speed loop are formed in the driver. 7, Speed Response Performance is different; stepper motor from the static acceleration to the working speed needs hundreds of milliseconds, and AC servo system acceleration performance is better, generally only a few milliseconds, can be used for rapid start and stop of control occasions. To sum up, AC servo system in many aspects of performance than stepping motor, but the price ratio is not the same.
