步進(jìn)電機(jī)及單片機(jī)英文文獻(xiàn)及翻譯(文件)
【正文】 ore VCC is restored to its normal operating level and must be held active long enough to allow the oscillator to restart and stabilize.中文譯文： 步進(jìn)電機(jī)的知識(shí)什么是步進(jìn)電機(jī)：步進(jìn)電機(jī)是一種把電脈沖轉(zhuǎn)化為角位移的執(zhí)行機(jī)構(gòu)。 6. Motor response only determined by the number of input pulses, which can be used open loop control, which makes the motor and control structure can be relatively simpleSystem cost 7. Just load directly connected to the motor shaft can also be extremely slow synchronous rotation. 8. Speed ??is proportional to the pulse frequency, and thus a relatively wide speed range.Shortings1. If not properly controlled prone to resonance。 2. When the motor stopped with a maximum torque (when the winding excitation time)。 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 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 exampleWe 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。 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。 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。 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。 3. Since the accuracy of each step in the three per cent to five per cent, and the error will not accumulate to the next step and thus has better positional accuracy and repeatability of movement。2. Difficult operation to a higher speed.3. Difficult to obtain high torque4. There is no advantage in terms of volume weight, low energy efficiency.5. Over load will destroy the synchronization, the work will be issued when highspeed vibration and noise.Stepper motor drive requirements(1) to provide fast rise and fall of current speed, the current waveform as close as possible rectangle.For the period ended with the release of the loop current flow, to reduce the winding ends of the back electromotive force, to accelerate the current decay.(2) rhyme with higher power and efficiency.
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