Stepper motor is a kind of discrete movement of the device, it has the nature of the contact and the modern digital control technology. In the current domestic digital control system, stepping motor is widely used. with the emergence of all-digital ac stepping system, communication step motor are increasingly used in the digital control system. In order to adapt to the development trend of digital control, motion control system mostly adopts stepper motor or digital ac motor stepper motor as the execution. Although both similar on control mode (Pulse sequence and direction signal), but in the use of performance and applications on there is a big difference. A comparison to be made regarding the use performance of both. one, the control precision of different two-phase hybrid stepper motor step Angle is commonly 3. 6°、 1. Step 8 °, 5 phase hybrid stepping motor is apart from the Angle of general to 0. 72 °、0. 36°。 There are also some high-performance stepper motor step Angle is smaller. communication control precision of the step motor by the motor shaft after the rotary encoder. All-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 ° / 10000 = 0. 036°。 For with 17 encoder of the motor, drive each receive 217 = 131072 pulse motor turns a circle, namely the pulse equivalent to 360 ° / 131072 = 9. In 89 seconds. Step is from Angle of 1. 8 ° stepper motor of 1/655 of the pulse equivalent. 2, low frequency characteristics of different stepper 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, different stepper 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. 4, different stepper motor overload capacity 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. 5, different running performance stepper 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 the ascending and descending speed problem. 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. 6, speed response performance different stepper motor to 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 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. the place on put together is narrated, 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:
