单片机控制步进电机外文文献翻译Word文档下载推荐.docx

1、 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,

2、 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

3、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 f

4、requency. 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 direc

5、tion 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 powe

6、r 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 fail

7、ure 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

8、 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

9、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:

10、 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

11、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

12、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 st

13、epping 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

14、, 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 o

15、utput 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 s

16、pecial 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

17、 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

18、 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, pos

19、sible 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 （m

20、otor 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 ca

21、n 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

22、, 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

23、, 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 48

24、VDC）, 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 driv

25、e, 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 curr

26、ent 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 ste

27、p 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 p

28、ulse4you 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）N

29、o 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. Steppe

30、r 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

31、 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 cons