Stepper motor stepper motor is the electrical pulse signal into angular displacement or linear displacement of open loop control stepping motor. In the case of the overload, motor speed, stop position depends only on the pulse signal frequency and pulse number, and not affected by load change, when the stepper driver receives a pulse signal, it is driving a stepper motor according to set the direction of a fixed point of view, called & other; Interval Angle & throughout; , its rotation is based on the Angle of the fixed step by step. Can be controlled by controlling the pulse number of angular displacement, so as to achieve the purpose of accurate positioning; As well as by controlling the pulse frequency to control motor rotation speed and acceleration, so as to achieve the purpose of regulating. Stepper motor is open loop. But the precision is very high,No cumulative error), due to the stepper motor used in belt transmission structure such as low precision. Step with encoder is to prevent the lost, does not change the mechanical precision of stepping motor itself. Current digital drive segment after the resolution is very high, but because of interference signals are lost or make the precision stepper motor has a certain error. Add the absolute value encoder will step because of errors from the Angle of pulse width is not the same, plus encoder has a certain issue may change the precision of the machine itself. But stepping motor moment occasionally throw pulse the possibility of more (Especially high speed start instantly, if deceleration processes is not good)。 The encoder didn't help either. So you also need to give stepper motor encoder driver software or control program is very good to cooperate. Stepper motor with encoder just raised some performance, high precision positioning is raised, moment didn't get promoted, basic can be ignored, and so will be lost. Above is any coder is introduced, the stepper motor servo motor is must have the encoder, if a servo motor without encoder, the motor can't be a servo motor. In terms of high precision control, servo motor can truly accurate positioning, step by step.
