【文章內(nèi)容簡介】 overe the following programs: A. If the stepper motor just work in the resonance, by changing the gear ratio can be mechanical transmission to avoid the resonance region。 B. subfunction used with the drive, which is the most mon and easiest method。 C. into a smaller step angle stepper motors, such as three or fivephase stepper motor。 D. replace the AC servo motor, can be almost pletely overe the vibration and noise, but the cost is high。 E. increase in the magic damper motor shaft, the product already on the market, but a larger change in mechanical structure. The breakdown of the number of subdriver is able to represent the precision Subdivision stepper motor is essentially an electronic damping (see the literature), its main purpose is to weaken or eliminate lowfrequency vibration of the stepper motor to improve the accuracy of the motor running with only one functional subdivision. For example, 176。 step angle of the twophase hybrid stepping motor, if the number of subsegments of the drive is set to 4, then the motor running a resolution of each pulse 176。, the precision can motor at or near 176。, also depends on the breakdown of subdrive current control accuracy and other factors. Breakdown of different manufacturers may vary significantly drive precision。 subdivision greater precision the number of difficult control. Series connection and What is the difference and join law Fourphase hybrid stepping motor and driver in series connection and the connection method and what is the difference? Fourphase hybrid stepping motor drives are generally two phases to drive, so connection can be used in series connection and the connection method or the fourphase motor connected into a twophase use. Series connection is generally used where a low motor speed, this time need to drive the motor phase current output current of times, so a small motor heating。 and join law generally places a higher motor speed to use (also known as highspeed access method), the required drive output current times the motor phase current, and thus a larger motor heat. How to determine the stepper motor driver DC power supply A. Determination of the voltage Hybrid stepping motor driver power supply voltage is generally a wide range (such as the IM483 supply voltage of 12 ~ 48VDC), the supply voltage is usually based on the work of the motor speed and response to the request to choose. If the motor operating speed higher or faster response to the request, then the voltage value is high, but note that the ripple voltage can not exceed the maximum input voltage of the drive, or it may damage the drive. B. Determination of Current Power supply current is generally based on the output phase current drive I to determine. If a linear power supply, power supply current is generally preferable to times the I。 if we adopt the switching power supply, power supply current is generally preferable to I, to times. Hybrid stepping motor drive signal is FREE to use offline FREE offline signal when low, the drive output to the motor current is cut off, the rotor is in a free state (off state). In some automation equipment, uninterruptible power if the drive directly in cases of motor shaft rotation (manual mode), you can set FREE signal is low, the motor off, the manual operation or adjustment. Manual is pleted, then the FREE signal set high, to continue to automatic control. How to adjust the power of twophase stepper motor direction of rotation Just drive the motor wiring and A + and A(or B + and B) can be reversed. The main characteristics of stepping motor A stepper motor drive can be added operate pulse drive signal must be no pulse when the stepper motor at rest, such as If adding the appropriate pulse signal, it will to a certain angle (called the step angle) rotation. Rotation speed and pulse frequency is proportional to. 2 Dragon step angle stepper motor version is degrees, 360 degrees around, takes 48 pulses to plete. 3 stepper motor has instant start and rapid cessation of superior characteristics. Change the pulse of the order of 4, you can easily change the direction of rotation. Therefore, the current printers, plotters, robotics, and so devices are the core of the stepper motor as the driving force. Stepper motor control example We use fourphase unipolar stepper motor as an example. The structure shown in Figure 1: Four fourphase winding leads (as opposed to phase A1 A2 B1 phase phase B2) and two public lines (to the power of positive). The windings of one phase to the power of the ground. So that the windings will be inspired. We use fourphase eightbeat control, ie, 1 phase 2 phase alternating turn, would enhance resolution. 176。 per step can be transferred to control the motor excitation is transferred in order as follows: If the requirements of motor reversal, the transmission excitation signal can be reversed. 2 control scheme Control system block diagram is as follows The program uses AT89S51 as the main control device. It is patible with the AT89C51, but also increased the SPI interface and the watchdog module, which not only makes the debugging process bees easy and also more stable. The microcontroller in the program mainly for field signal acquisition and operation of the stepper motor to calculate the direction and speed information. Then sent to the CPLD. CPLD with EPM7128SLC8415, EPM7128 programmable logic device of largescale, for the ALTERA pany39。s MAX7000 family. High impedance, electrically erasable and other characteristics, can be used for the 2500 unit, the working voltage of +5 V. CPLD receives information sent from the microcontroller after converted to the corresponding control signal output to the stepper motor drive. Put the control signal drives the