科技文章摘译

英文文献翻译

二〇一三年六月七日

外文文献：

Knowledge of the stepper motor

What 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 two-phase, torque, and smaller, step angle of 7.5 degrees or the general 15 degrees; reaction step is generally three-phase, can achieve high torque output, step angle of 1.5 degrees is generally, but the noise and vibration are large. 80 countries in Europe and America have been eliminated; hybrid stepper is a mix of permanent magnet and reactive advantages. It consists of two phases and the five-phase: two-phase step angle of 1.8 degrees while the general five-phase step angle of 0.72 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 3-5%, and not cumulative. Stepper motor to allow the minimum amount of surface temperature

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.

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 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：

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 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 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 four-phase unipolar stepper motor as an example. The structure shown in Figure 1:

Four four-phase 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 four-phase eight-beat control, ie, 1 phase 2 phase alternating turn, would enhance resolution. 0.9 ° 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 compatible with the AT89C51, but also increased the SPI interface and the watchdog module, which not only makes the debugging process becomes 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 EPM7128SLC84-15, EPM7128 programmable logic device of large-scale, for the ALTERA company'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 motor windings after the input, to achieve effective control of the motor. 2.1 The hardware structure of the motor drive

Motor drive using the following circuit:

R1-R8 in which the resistance value of 320Ω. R9-R12 resistance value 2.2KΩ. Q1-Q4 as Darlington D401A, Q5-Q8 for the S8550. J1, J2 and the stepper motor connected to the six-lead。

Advantages and disadvantages of stepper motor

Advantages

1. The motor rotation angle is proportional to the number of pulses;

2. When the motor stopped with a maximum torque (when the winding excitation time);

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;

4. Excellent response from the stop and reverse;

5. In the absence of brush, high reliability, it just depends on the life of the motor bearing life;

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 simple

System 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. Shortcomings

1. If not properly controlled prone to resonance;

2. Difficult operation to a higher speed.

3. Difficult to obtain high torque

4. 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 high-speed 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.

Stepper motor driver, which is the control pulse signal emitted into the angular displacement of the stepper motor, or: the control system sends a pulse signal each through the stepper motor drive to rotate a step angle. That is the stepper motor speed is proportional to the frequency and pulse signals. Therefore, the frequency control pulse signal, to be precise motor speed control; control the number of step pulses to connect the motor accurately. Stepper motor drive there are many, we should take a reasonable choice of power requirements of the drive, the following were introduced various types of typical drive.

The latest technological developments

Domestic and international research on the sub-drive technology is very active, high-performance sub-driver circuit can be broken down into thousands or even any subdivision. Now able to do complicated calculations to make after the breakdown of uniform step angle, which greatly improves the resolution of stepper motor pulses, reduce or eliminate the vibration, noise and torque ripple, the stepper motor is more

The actual role of step angle: in the absence of sub-drive, the user select a different number of phases depends mainly on the stepper motor to meet their own requirements on the step angle，If you use the sub-drive, the user can change the drive number of segments, can dramatically change the actual step angle stepper motor 'phases' of change in the role of the actual step angle is almost negligible.

中文译文：

步进电机的知识

什么是步进电机：

步进电机是一种把电脉冲转化为角位移的执行机构。通俗的说：当驱动程序收到一个步进脉冲信号，将驱动步进电机轴旋转一个固定的角度（步进角）。您可以通过控制脉冲个数来控制角位移，从而达到准确定位的目的;同时，你可以通过控制脉冲频率来控制电机的旋转速度和加速度，实现速度控制的目的。

步进电机的种类：

步进电机分为三种：永磁式（PM），反应式（VR）和混合式（HR）永磁式步进电机一般为两相，转矩和体积较小，步进角一步7.5度或15度;反应式一般有三相可以实现大转矩输出，步进角一般是1.5度，但噪声和振动大。在欧洲和美洲80个国家已被淘汰;混合式步进是混合了永磁式和反应的优势。它由两相和五相：一般两相的步距角是1.8度，而的五相步距角为0.72度。是使用最广泛的的步进电机。

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值取决于的磁性材料退磁点;一般来说，磁性材料退磁点在摄氏130度以上有些材料甚至高达摄氏200度高，所以步进电机表面温度在摄氏80-90度是正常的。

步进电机精度为多少？是否累积

一般步进电机的精度为步进角的3-5%，且不累积

如何确定步进电机驱动器直流电源

A.电压确定

混合式步进电机驱动器的电源电压范围较广（比如IM483的供电电压12〜

48VDC），电源电压通常根据电机的转速和响应要求来选择。如果要求较快的运行速度较高的响应速度就选用较高的电压，但注意电源电压的峰值不能超过驱动器的最大输入电压，否则可能会损坏驱动器。

B.电流确定

电源电流一般根据输出相电流I来确定。如果采用线性电源，电源电流一般可取I的1.1〜1.3倍;如果采用开关电源，电源电流一般可取I的1.5〜2.0倍。 步进电机的主要特性

在步进电机关机时要确保没有脉冲信号，当电机运行时

如果加入适当的脉冲信号，它会转过一定的角度（称为步距角是）。转速与脉冲频率成正比。

2龙式步进电机步距角7.5度，旋转360度，需要48个脉冲来完成。

3步进电机具有快速启动和停止的优良特性。

4只要改变脉冲，可以很容易地改变电机轴旋转的方向。

因此，目前的打印机，绘图仪，机器人设备以步进电机作为动力核心。

步进电机控制的例子

我们以四相单极步进电机为例：

四个相绕组引出四个相和两个公共线（连接到正极）。一相接地。会被激发，。我们使用四相八拍控制，即第1阶段第2阶段交替反过来，会提高分辨率。步距角0.9°，可以转移到控制电机励磁是为了转移如下：

如果电机反转的要求，传输的激励信号可以逆转的。 2控制方案

控制系统框图如下

该方案采用AT89S51的主要控制装置。它是与AT89C51兼容，但也增加了SPI接口和看门狗模块，这不仅使调试变得更容易，也更稳定。单片机程序主要用于现场信号的采集和通过步进电机的运转来计算的方向和速度信息。然后将信息发送到CPLD。

CPLD使用EPM7128SLC84-15，ALTERA公司的MAX7000系列可编程逻辑器件

EPM7128。具有高阻抗，电可擦除等特点，可用单位数为2500单位，工作电压+5 V CPLD接收脉冲后转换为相应的控制信号输出到步进电机驱动器，从微控制器发送的信息。输入后把控制信号发送到驱动电机绕组，以达到有效控制电机的目的。 2.1为电机驱动器的硬件结构

电机驱动器通过下面的电路来实现：

R1〜R8的电阻值为320Ω。 R9-R12的电阻值为2.2KΩ。 Q1〜Q4作为达林顿401A，Q5-Q8为S8550。 J1，J2和步进电机连接到六个接口。

步进电机优点和缺点

优势

1。电机的旋转角度与脉冲数成正比;

2。当电机停转为最大转矩（当绕组励磁时）;

3。由于每一步准确度为百分之三到五，而且误差不会累积到下一步，因而具有更好定位精度和重复定位精度;

4。优良的启动和制动特性_;

5。没有电刷，可靠性高，电机的寿命只是取决于电机轴承;

6。电机_仅由输入脉冲数决定，可用于开环控制，这使得电机和控制结构确定相对简单

系统成本

7。只是负载直接连接到电机轴也可以极其缓慢旋转

8。速度与的脉冲频率成正比，因此，有相对较宽的调速范围

缺点

1。如果没有适当的控制，容易共振;

2。高速操作难度较大

3。难以获得大转矩

4。没有体积小，重量轻，能耗低，效率高等方面优势

5。过载时会破坏同步性，工作时会发出时较大的振动和噪音

步进电机驱动要求

（1）为了满足速度迅速上升或下降的要求，波形应当尽可能接近矩形

以释放回路电流流，绕组两端的反电动势，加速电流衰减

（2）具有较高功率和效率

步进电机驱动器，把输入的脉冲信号转化为角位移，每当控制系统发出一个脉冲信号，步进电机驱动就旋转一个步距角，步进电机的速度与的脉冲信号频率成正

比，因此，通过控制脉冲信号频率，就可以精确控制电机转速步进脉冲数决定准确连接为电机步进电机驱动器有很多，我们应该根据功率采取的合理的方式选择驱动器

最新的技术发展

国内和国际上对于驱动技术的研究十分活跃，高性能子驱动电路可以细分成几千部分甚至任意细分，现在已经能够做到通过复杂的计算统一步距角，大大提高了步进电机的脉冲分辨率，减少或消除振动，噪声和转矩波动，步进电机有了更多“类伺服”功能

实际作用：步距角细分驱动器出现之前，用户需要选择不同的相来获取不同的步进电机步距角，以满足自己的要求，如果使用细分驱动器，用户可以通过更改驱动器号段，来改变实际的步距角，相数对实际步距角的作用几乎可以忽略不计