I would like to ask: full closed loop control system, the use of stepper motors and servo motor advantages and disadvantages
Upstairs answer:The servo pulse depends mainly on the location, basically can be understood in this way, the servo motor receives 1 pulse, 1 pulse rotation angle will be corresponding, so as to realize the displacement, because the servo motor itself has the function of a pulse, so the servo motor rotates one angle, will send a corresponding number of pulses, so the servo motor and accept pulse forming the echo, or closed loop, so that the system will know how much pulse to the servo motor, also received a number of pulse back, so you can control the motor rotation, very accurate, so as to realize accurate positioning
Upstairs misleading Oh:The servo motor and stepper motor structure is similar, do not have send pulse function, but because there is a servo motor with encoder, so pulse feedback, through pulse feedback servo drive system, and can achieve between the semi closed loop structure, but does require full closed loop control, is needed in the transmission device eventually, such as wire rod or mobile platform mounted above the grating encoder or, if that is the case, servo and stepper servo can be, just do not exist blockage and step phenomenon, more simple, but the cost is relatively high, according to the actual situation to choose,Today's intelligent stepper control system, stepper motor is also installed encoder, internal control methods and servo function is approaching, there is no blocking and lost step phenomenon;
The stepper motor is an open loop control element that changes the electrical pulse signal into angular displacement or linear displacement. In the case of non overloaded, the motor speed and stop position depends only on the pulse frequency and pulse number, regardless of load changes, namely to add a pulse motor, the motor is turned to a step angle. The existence of this linear relationship, and stepper motor only periodic error and accumulated error etc.. It is very simple to control by stepping motor in the control field of speed, position and so on.
