Differences between servo motors and stepping motors

Servo motor is an engine that controls the operation of mechanical components in a servo system, and is a subsidized motor indirect variable speed device. Servo motor can make the control speed, position accuracy is very accurate, can be converted into voltage signal torque and speed to drive the control object. Servo motor rotor speed is controlled by the input signal, and can respond quickly, in the automatic control system, used as an executive element, and has a small electromechanical time constant, high linearity, starting voltage and other characteristics, can be converted to the received electrical signal into an angular displacement on the motor shaft or angular velocity output. Divided into two categories of DC and AC servo motors, its main feature is that there is no self-rotating phenomenon when the signal voltage is zero, and the rotational speed decreases uniformly with the increase of torque.

Stepping motor is an open-loop control motor that transforms the electrical pulse signal into angular displacement or line displacement, and it is the main execution element in the modern digital program control system, which is extremely widely used. In the case of non-overload, the speed and stopping position of the motor only depend on the frequency of the pulse signal and the number of pulses, and are not affected by the change of the load. When the stepping driver receives a pulse signal, it drives the stepping motor to rotate by a fixed angle in the set direction, which is called the “step angle”. It runs step by step. The number of pulses can be controlled to control the angular displacement to achieve the purpose of accurate positioning; at the same time, the frequency of pulses can be controlled to control the speed and acceleration of the motor rotation, so as to achieve the purpose of speed regulation.

  stepping motor is a kind of induction motor, its working principle is the use of electronic circuits, DC power into time-sharing power supply, multi-phase timing control current, with this current for the stepping motor power supply, the stepping motor to work properly, the driver is for the stepping motor time-sharing power supply, multi-phase timing controller.

 Although stepping motors have been widely used, stepping motors can not be used like ordinary DC motors, AC motors in the routine. It must be a double ring pulse signal, power drive circuits and other control systems can be used. Therefore, the use of good stepping motor is not easy, it involves a lot of specialized knowledge of machinery, motor, electronics and computers. Stepping motor as an executive element, is one of the key products of mechatronics, widely used in various automation control systems. With the development of microelectronics and computer technology, the demand for stepping motors is increasing day by day, and they are used in various national economic fields.