单片机控制步进电机外文文献翻译.doc

单片机控制步进电机外文原文Stepping motor application and controlstepper motor is an electrical pulse will be converted into angular displacement of the implementing agencies. Put it in simple language-speaking: When the stepper drive pulse signal to a receiver, it drives stepper motor rotation direction by setting a fixed point of view (and the step angle). You can control the number of pulses to control the amount of angular displacement, so as to achieve the purpose of accurate positioning; At the same time, you can by controlling the pulse frequency to control the motor rotation speed and acceleration, so as to achieve the purpose of speed. Stepper motor directly from the AC-DC power supply, and must use special equipment - stepper motor drive. Stepper motor drive system performance, in addition to their own performance with the motor on the outside, but also to a large extent depend on the drive is good or bad. A typical stepper motor drive system is operated by the stepper motor controller, stepper motor drives and stepper motor body is composed of three parts. Stepper motor controller stepper pulse and direction signal, each made of a pulse, stepper motor-driven stepper motor drives a rotor rotating step angle, that is, step-by-step further. High or low speed stepper motor, or speed, or deceleration, start or stop pulses are entirely dependent on whether the level or frequency. Decide the direction of the signal controller stepper motor clockwise or counterclockwise rotation. Typically, the stepper motor drive circuit from the logic control, power driver circuit, protection circuit and power components. Stepper motor drive controller, once received from the direction of the signal and step pulse, the control circuit on a pre-determined way of the electrical power-phase stepper motor excitation windings of the conduction or cut-off signal. Control circuit output signal power is low, can not provide the necessary stepping motor output power, the need for power amplifier, which is stepper motor driven power drive part. Power stepper motor drive circuit to control the input current winding to form a space for rotating magnetic field excitation, the rotor-driven movement. Protection circuit in the event of short circuit, overload, overheating, such as failure to stop the rapid drive and motor. Motor is usually for the permanent magnet rotor, when the current flows through the stator windings, the stator windings produce a magnetic field vector. The magnetic field will lead to a rotor angle of rotation, making a pair of rotor and stator magnetic field direction of the magnetic field direction. When the stator rotating magnetic field vector from a different angle. Also as the rotor magnetic field to a point of view. An electrical pulse for each input, the motor rotation angle step. Its output and input of the angular displacement is proportional to the pulses, with pulse frequency proportional to speed. Power to change the order of winding, the electrical will be reversed. We can, therefore, control the pulse number, frequency and electrical power windings of each phase to control the order of rotation of stepper motor. Stepper motor types: Permanent magnet (PM). Magnetic generally two-phase stepper, torque and are smaller and generally stepping angle of 7.5 degrees or 15 degrees; put more wind for air-conditioning. Reactive (VR), the domestic general called BF, have a common three-phase reaction, step angle of 1.5 degrees; also have five-phase reaction. Noise, no torque has been set at a large number of out. Hybrid (HB), common two-phase hybrid, five-phase hybrid, three-phase hybrid, four-phase hybrid, two-phase can be common with the four-phase drive, five-phase three-phase must be used with their drives; Two-phase, four-phase hybrid step angle is 1.8 degrees more than a small size, great distance, and low noise; Five-phase hybrid stepping motor is generally 0.72, the motor step angle small, high resolution, but the complexity of drive circuits, wiring problems, such as the 5-phase system of 10 lines. Three-phase hybrid stepping motor step angle of 1.2 degrees, but according to the use of 1.8 degrees, the three-phase hybrid stepping motor has a two-phase mixed than the five-phase hybrid more pole will help electric folder symmetric angle, it can be more than two-phase, five-phase high accuracy, the error even smaller, run more smoothly. Stepper motor to maintain torque: stepper motor power means no rotation, the stator locked rotor torque. It is a stepper motor, one of the most important parameters, usually in the low-speed stepper motor torque at the time of close to maintain the torque. As the stepper motor output torque increases with the speed of constant attenuation, the output power also increases with the speed of change, so as to maintain torque on the stepper motor to measure the parameters of one of the most important. For example, when people say that the stepper motor 2N.m, in the absence of special circumstances that means for maintaining the torque of the stepper motor 2N.m. Precision stepper motors: stepper motor step angle accuracy of 3-5%, not cumulative. Stepper 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; 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 80-90 degrees Celsius is normal. Start frequency of no-load: the stepper motor in case of no-load to the normal start of the pulse frequency, if the pulse frequency is higher than the value of motor does not start, possible to lose steps or blocking. In the case of the load, start frequency should be lower. If you want to achieve high-speed rotation motor, pulse frequency should be to accelerate the process, that is, the lower frequency to start, and then rose to a certain acceleration of the desired frequency (motor speed from low rise to high-speed). Step angle: that is to send a pulse, the electrical angle corresponding to rotation. Torque positioning: positioning torque stepper motor does not refer to the case of electricity, locked rotor torque stator. Operating frequency: step-by-step stepper motor can run without losing the highest frequency. Subdivision Drive: stepper motor drives the main aim is to weaken or eliminate low-frequency vibration of the stepper motor to improve the accuracy of the motor running. Reduce noise. If the step angle is 1.8 (full step) the two-phase hybrid stepping motor, if the breakdown of the breakdown of the number of drives for the 8, then the operation of the electrical pulse for each resolution of 0.072 , the precision of motor can reach or close to 0.225 , also depends on the breakdown of the breakdown of the drive current control accuracy and other factors, the breakdown of the number of the more difficult the greater the precision of control. 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 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 1.1 to 1.3 times the I; if we adopt the switching power supply, power supply current is generally preferable to I, 1.5 to 2.0 times. The main characteristics of stepping motor： 1. 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. permanent magnet step angle stepper motor version is 7.5 degrees, 360 degrees around, takes 48 pulses to complete. 3. stepper motor has instant start and rapid cessation of superior characteristics.Change the order of the pulse4you 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 motors have the following benefits: （1）Low cost （2）Ruggedness （3）Simplicity in construction （4）High reliability （5）No maintenance （6）Wide acceptance（7）No tweaking to stabilize （8）No feedback components are needed They work in just about any environment Inherently more failsafe than servo motors. There isvirtually no conceivable failure within the stepper drive module that could cause the motor to run away. Stepper motors are simple to drive and control in an open-loop configuration. They only require four leads. They provide excellent torque at low speeds, up to 5 times the continuous torque of a brush motor of the same frame size or double the torque of the equivalent brushless motor. This often eliminates the need for a gearbox. A stepper-driven-system is inherently stiff, with known limits to the dynamic position error. Stepper Motor Disadvantages：Stepper motors have the following disadvantages:1. Resonance effects and relatively long settling times .2.Rough performance at low speed unless a microstep drive is used .3.Liability to undetected position loss as a result of operating open-loop .4. They consume current regardless of load conditions and therefore tend to run hot 5. Losses at speed are relatively high and can cause excessive heating, and they are frequently noisy (especially at high speeds).6.They can exhibit lag-lead oscillation, which is difficult to damp. There is a limit to their available size, and positioning accuracy relies on the mechanics (e.g., ballscrew accuracy).Many of these drawbacks can be overcome by the use of a closed-loop control scheme. 外文资料翻译译文步进电机应用和控制步进电机是将电脉冲转换成角位移的执行机构。通俗的讲：当步进电机驱动器接收到脉冲信号，它就驱动步进电机按设定的方向转动一个固定的角即步进角。你可以控制脉冲的个数来控制角位移量，从而能准确定位；同时你可以通过控制脉冲频率来控制电机转动的速度和加速度，从而达到改变速度的目的。 步进电机不能直接用交直流电源供电，而必须使用专用设备即步进电机驱动器。步进电机驱动系统的性能，除与电机自身性能有关外，在很大程度上取决于驱动器的好坏。一个典型的步进电机驱动系统是由步进电机控制器，步进电机驱动器和步进电机三部分组成。步进电机控制器发出步进脉冲和方向信号，每一个脉冲，步进电机驱动器驱动步进电机转子旋转一个步距角，就是一步。步进电机转速的高低，加速和减速，启动或停止完全取决脉冲的有无和频率的高低。控制器的方向信号决定步进电机的正转或者反转。通常，步进电机驱动器由逻辑控制电路、保护电路、功率驱动电路和电源组成。当步进电机驱动器接收到来自控制器的方向信号和步进脉冲，控制电路就按照预先设定的电机通电方式产生步进电机各相励磁绕组导通或截止信号。由于控制电路输出的信号功率很低，不能提供步进电机所需的输出功率，所以必须进行功率放大，这就是步进电机驱动器的功率驱动部分。功率驱动电路向步进电机控制绕组输入电流，使其励磁形成空间旋转磁场，驱动转子运动。保护电路在出现短路、过载、等故障时迅速停止驱动器和电机的运行。 电机转子通常是永磁转子，通过定子绕组的电流流时，定子绕组产生的磁场矢量。会使转子的旋转一定角度，使一对转子的磁场方向和定子的磁场方向一致。当定子旋转磁场矢量旋转一个角度，转子也随着这个磁场旋转一个角度。每个输入一个电脉冲，电机的旋转一个角度前进一步。它的输出角位移和输入脉冲数是成正比的，速度与脉冲频率成正比。改变绕组通电的顺序，电机就会反转。因此，我们可以用控制脉冲数，脉冲频率和电机绕组的通电顺序来控制步进电机旋转。步进电机类型： 永磁式（PM）。永磁式步进电机一般两相步进电机，转矩和体积较小，一般步进角度为7.5度或15度，多用于空调风摆上。 反应式（VR），国内一般称为BF，常见的是三相反应式，步进角度为1.5度，也有五相反应式。混合式（HB），普通的两相混合式，五相混合式，三相混合，四相混合式，两相和四相可以通用驱动器。五相和三相只能用自己的驱动器。两相，四相混合式步进角为1.8度，具有小体积，大力距，低噪的特点。五相混合式步进电机一般为0.72度，电机步距角小，分辨率高，但驱动电路复杂，接线麻烦。三相混合式步进电机步距角为1.2度，但使用中要按1.8度计算，三相混合式步进电机拥有比两相混合，五相混合式更多的磁极。有利于电动机夹角的对称，因此可以比两相，五相精度更高，误差更小，运行更平稳。步进电机保持扭矩：指步进电机通电但没有转动时，定子锁住转子的力矩。它是步进电机最重要的参数之一，通常步进电机在低速的力矩接近保持转矩，由于步进电机的输出转矩随速度的增加而不断衰减，输出功率也随速度的增加而变化，从而保持扭矩成为衡量步进电机最重要的参数之一。例如，当人们说2N.m的步进电机，在没有特殊说明的情况下是指保持扭矩为2N.m.的步进电机 步进电机的精度：步进电机的精度为步距角的3-5，且不累积。步进电机允许的最高表面温度：步进电机温度过高首先会的磁性材料退磁，导致转矩降低甚至失步，电机表面温度允许的最大