Stepper motor is a kind of discrete movement of the device, its production and the development of digital control technology has a great relationship, the current domestic stepper motor development soon, this is the result of the development of domestic digital control system. But now with the emergence of ac stepper motor, the choice is a kind of more, then, step motor and what is the difference between communication stepper motor? One, the control precision of different two-phase hybrid stepper motor step Angle generally to 1. 8°, 0. 9°Step, three-phase hybrid stepping motor is apart from the Angle of the general is 1. 2°, 0. 6°, five step away from the Angle of the hybrid stepping motor is commonly 0. 72 °, 0. 36°。 Where there are also some high-performance stepper motor step Angle smaller, if there is a kind of stepping motor for wire walking machine, the step from the Angle of 0. 09°； But now most of the stepper motor drives have step torque Angle segment function, so the hybrid stepping motor by subdivision drive dial the code switch Settings, motor per pulse number can be subdivided into 200, 400, 800. 。 。 。 。 。 Even 51200. Exchange control precision of the step motor by the motor shaft after the rotary encoder. Panasonic digital ac stepper motor, for example, in line with standard 2500 encoder of the motor, drive due to the internal used four frequency multiplication technology, the pulse equivalent to 360 & deg; / 10000 = 0. 036°。 For with 17 encoder of the motor, drive each receive 217 = 131072 pulse motor turns a circle, i. e. the pulse equivalent of 360 & deg; / 131072 = 9. In 89 seconds. Step is from Angle of 1. 8°1/655 of the pulse equivalent of stepper motor. 。 Second, the low frequency characteristics of sync motor at low speed is easy to appear low frequency vibration phenomenon. Vibration frequency is associated with load and drive performance, it is generally believed half frequency vibration frequency for the motor no-load takeoff. This determined by the working principle of stepper motor in low frequency vibration phenomenon is very bad for the normal operation of the machine. When the stepper motor work in low speed, general damping technology should be adopted to overcome the low frequency vibration phenomenon, such as add damper on motor, or drive the segmentation technology, etc. Communication step motor running smoothly, even in the low speed also won't appear when the vibration phenomenon. Step system has a resonance inhibit communication function, can cover mechanical rigidity, and the system has the function of frequency resolution (FFT), can detect the mechanical resonance point, is advantageous for the system adjustment. The torque-speed characteristic in three, asynchronous motor's output torque increases with speed decreases, and at a high speed when they fell sharply, so its maximum working speed is in commonly 300 ~ 600 RPM. Exchange step motor as the constant torque output, that is, in its rated speed (General is 2000 RPM and 3000 RPM)Less than, can be rated output torque, in for a constant power output above the rated speed. Four, overload capacity is not synchronous motor is generally not have overload ability. Communication step motor has the strong ability of overload. Panasonic ac stepping system, for example, it has the speed overload and torque overload capacity. The maximum torque is three times the rated torque, can be used to overcome inertia load at startup moments of inertia moment. Stepper motor because there is no this kind of overload capacity, in order to overcome the inertia moment when selection, often need to select a larger torque of the motor, and the machine during the normal work and don't need that big torque, there is a moment of waste phenomenon. Five, the running performance of sync motor control for the open loop control, start frequency is too high or too much load step easy appear lost or blocked, stops frequently occur high speed overshoot phenomenon, so as to ensure the control accuracy, should handle up, slow down. Ac stepping driving system for closed-loop control, the drive can be directly to the motor encoder feedback signal sampling, internal position loop and speed loop, general won't appear step motor lose step or overshoot phenomenon, more reliable control performance. Six, response performance of the asynchronous motor speed accelerate from 0 to speed (Generally for a few hundred revolutions per minute)Need to 200 ~ 400 milliseconds. Better communication step acceleration performance of the system, with panasonic MSMA 400 w ac stepping motor as an example, from static accelerated to the rated speed 3000 RPM it takes only a few milliseconds, can be used for quick start-stop control occasions. To sum up, ac stepper system in many performance is better than the stepping motor. But in some occasion not high demand also often use stepper motor to do perform motor. So, in the process of the design of the control system to a comprehensive, with consideration of many factors such as cost control requirements, choose the proper control motors. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
