【正文】 n angle is proportional to the number of pulses。 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 schemeControl 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。 Generally speaking, the magnetic demagnetization points are above 130 degrees Celsius, and some even as high as 200 degrees Celsius, so the stepper motor surface temperature of 8090 degrees Celsius is normal.How to determine the stepper motor driver DC power supply： A. Determination of the voltageHybrid 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 CurrentPower 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。 reaction step is generally threephase, can achieve high torque output, step angle of degrees is generally, but the noise and vibration are large. 80 countries in Europe and America have been eliminated。外文文獻(xiàn)： Knowledge of the stepper motorWhat is a stepper motor： Stepper motor is a kind of electrical pulses into angular displacement of the implementing agency. Popular little lesson: When the driver receives a step pulse signal, it will drive a stepper motor to set the direction of rotation at a fixed angle (and the step angle). You can control the number of pulses to control the angular displacement, so as to achieve accurate positioning purposes。 the same time you can control the pulse frequency to control the motor rotation speed and acceleration, to achieve speed control purposes.What kinds of stepper motor sub： In three stepper motors: permanent magnet (PM), reactive (VR) and hybrid (HB) permanent magnet stepper usually twophase, torque, and smaller, step angle of degrees or the general 15 degrees。 hybrid stepper is a mix of permanent magnet and reactive advantages. It consists of two phases and the fivephase: twophase step angle of degrees while the general fivephase step angle of degrees generally. The most widely used Stepper Motor.What is to keep the torque (HOLDING TORQUE)How much precision stepper motor? Whether the cumulative： The general accuracy of the stepper motor step angle of 35%, and not cumulative.Stepper motor to allow the minimum amount of surface temperatureStepper motor to allow the minimum amount of surface temperature：Stepper motor causes the motor temperature is too high the first magnetic demagnetization, resulting in loss of torque down even further, so the motor surface temperature should be the maximum allowed depending on the motor demagnetization of magnetic material points。 if we adopt the switching power supply, power supply current is generally preferable to I, to times.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 asIf 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 pl