The difference between the step motor drive and the servo motor driver?
The difference between the step motor and the servo motor is: 1, the control accuracy is different. Stepping motor phase and shoot, the more its precision is higher, the servo motor to take to bring their own piece of encoder, the more the encoder scale, the higher the precision. 2, the control method is different; One is open loop control, one is closed loop control. Low frequency characteristics; Stepper motor at low speed is easy to appear low frequency vibration phenomenon, when it is commonly used while working in low-speed damping technology or segmentation technology to overcome the low frequency vibration phenomenon, servo motor running smoothly, even in the low speed also won't appear when the vibration phenomenon. Ac servo system has a resonance suppression function, can cover the mechanical rigidity, and internal system has the function of frequency resolution (FFT), can detect the mechanical resonance point to facilitate system adjustment. Four, the moment frequency characteristics are different; The output torque of the stepping motor decreases with the increase of the speed, the ac servo motor is the output of constant torque, and the capacity of the overload is different. The stepping motor is generally not overloaded, and the ac motor has the capability of overload
Stepper motor is the electrical pulse signal into angular displacement or line displacement of the stepper motor open-loop control yuan, 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, set the direction of a fixed Angle, known as the "step Angle", 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 high speed. Servo motor is also called the execution, in the automatic control system, is used as actuators, the received electrical signal into angular displacement or angular velocity output of motor shaft. The inside of the servo motor rotor is a permanent magnets, three-phase electric drive control of U/V/W form the electromagnetic field, under the action of rotating rotor in this field, at the same time, motor with encoder feedback signal to drive, drive according to the feedback value compared with the target, adjust the Angle of the rotor rotation.
There is no feedback from the step motor drive, only the fixed displacement per output will not change with the change of the load of the motor. The servo motor actuator is the closed loop control, which automatically compensates the difference when the output is shifted.
The price is cheap, the torque is small, and the process is easy to slip and move. The server does not have these disadvantages, which is more expensive
Stepper motor can be said to be the asynchronous motor, servo motor is a synchronous motor, control up to reason about, chopper output, but need to measure the rotor position synchronous motor control
