附录2：英文资料及其中文翻译Stepper motor is an electrical pulse will be converted into angular displacement of the implem enting agencies. Put it in simple language-speaking: When the stepper drive pulse signal to a r eceiver, it drives stepper motor rotation direction by setting a fixed point of view (and the ste p 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 controllin g the pulse frequency to control the motor rotation speed and acceleration, so as to achieve th e purpose of speed.Stepper motor directly from the AC-DC power supply, and must use special equipment - stepp er 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 mot or 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 spe ed, or deceleration, start or stop pulses are entirely dependent on whether the level or frequenc y. Decide the direction of the signal controller stepper motor clockwise or counterclockwise rot ation. Typically, the stepper motor drive circuit from the logic control, power driver circuit, pr otection 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 electr ical 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 powe r, 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, ove rload, 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 wi ndings, 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 magne tic 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 r otation angle step. Its output and input of the angular displacement is proportional to the pulse s, with pulse frequency proportional to speed. Power to change the order of winding, the elect rical will be reversed. We can, therefore, control the pulse number, frequency and electrical po wer 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 gen erally 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 angl e of 1.5 degrees; also have five-phase reaction. Noise, no torque has been set at a large numb er of out.Hybrid (HB), common two-phase hybrid, five-phase hybrid, three-phase hybrid, four-phase hybri d, two-phase can be common with the four-phase drive, five-phase three-phase must be used w ith 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 hybr id more pole will help electric folder symmetric angle, it can be more than two-phase, five-ph ase high accuracy, the error even smaller, run more smoothly.Stepper motor to maintain torque: stepper motor power means no rotation, the stator locked rot or torque. It is a stepper motor, one of the most important parameters, usually in the low-spee d stepper motor torque at the time of close to maintain the torque. As the stepper motor outp ut 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 parameter s of one of the most important. For example, when people say that the stepper motor 2N.m, i n the absence of special circumstances that means for maintaining the torque of the stepper m otor 2N.m.Precision stepper motors: stepper motor step angle accuracy of 3-5%, not cumulative.Start frequency of no-load: the stepper motor in case of no-load to the normal start of the pul se 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 wa nt to achieve high-speed rotation motor, pulse frequency should be to accelerate the process, th at is, the lower frequency to start, and then rose to a certain acceleration of the desired freque ncy (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, l ocked 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. I f 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 depend s 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.步进电机是一种将电脉冲转化为角位移的执行机构。