Knowledge of the Stepper motor
Stepper motor
Stepper motor is the electric pul signals into angular displacement or linear displacement of the open-loop stepper motor control element pieces. In the ca of non-overloaded, the motor speed, stop position depends only on the pul frequency and pul number, regardless of load changes, when the driver receives a step pul signal, it will drive a stepper motor to Set the direction of rotation of a fixed angle, called the "step angle", which the angle of rotation is fixed step by step operation. Number of puls can be controlled by controlling the angular displacement, so as to achieve accurate positioning purpos; the same time by controlling the pul frequency to control the motor rotation speed and acceleration, to achieve speed control purpos.
Work
Induction motor is a stepper motor, does it work is the u of electronic circuits, the DC power supply into a time-sharing, multi-pha timing control current, this current stepper mo
tor power supply, the stepper motor to work properly , The drive is sharing power supply for the stepper motor, the polypha timing controller
Although the stepper motor has been widely ud, but the stepper motor does not like a normal DC motor, AC motor in the conventional u. It must be double-ring pul signal, power driver circuit compod of the control system can be ud. Therefore, it is not easy with a good stepping motor, which involves mechanical, electrical, electronics and computers, and many other specialized knowledge.
As the stepper motor actuators, electromechanical integration, one of the key products, widely ud in a variety of automatic control systems. With the development of microelectronics and computer technology, increasing demand for stepper motor, has applications in all areas of the national economy.
Categories
Now more commonly ud include the reaction of step motor stepper motor (VR), permanent magnet stepper motor (PM), hybrid stepper motors (HB) and single-pha stepper motor.
Permanent magnet stepper motor
Permanent magnet stepper motor is generally two-pha, torque, and smaller, usually 7.5 degree step angle or 15 degrees;阿訇的意思是什么
Permanent magnet stepper motor output torque, dynamic performance, but a large step angle.
Reaction Stepper Motor
Reaction is generally three-pha stepping motor can achieve high torque output, step angle of 卷轴怎么画1.5 degrees is generally, but the noi and vibration are large. Reaction by the stepper motor rotor magnetic circuit made of soft magnetic materials, a number of the stator pha excitation winding, the u of permeability changes in 邹忌修八尺有余torque.
Step Motor simple structure, low production costs, step angle is small; but the dynamic performance is poor.
Hybrid Stepping Motor
Hybrid Step Motor combines reactive, permanent magnet stepper阴囊水肿 motors of both, it's a small step angle, contribute a large, dynamic performance, is currently the highest perfor
mance stepper motor. It is also sometimes referred to as Permanent Magnet Induction Stepping Motor. It consists of two phas and the five-pha: the general 血浆的功能two-pha step angle of 1.8 degrees and the general five-pha step angle 0.72 degrees. The most widely ud Stepper Motor.安乐死合法的国家
孟子资料Stepper motor drive for energy saving
Three-pha stepper motor drive special features:
■ 180% low torque output, low frequency characteristics of a good run
■ Maximum output frequency 600Hz, high-speed motor control
■ full range of detection of protection (over voltage, under voltage, overload) instantaneous power failure restart
■ acceleration, deceleration, 四维的时间such as dynamic change in the stall protection function to prevent
■ Electrical dynamic parameters of automatic recognition function to ensure stability and accuracy of the system
■ quick respon and high-speed shutdown
■ abundant and flexible input and output interface and control, versatility
■ u of SMT production and three full-mount anti-paint treatment process, product stability and high
■ full range of Siemens IGBT power devices using the latest, to ensure the quality of high-quality
Basic principles
Usually for the permanent magnet rotor motor, when current flows through the stator windings, the stator windings produce a magnetic field vector. The magnetic field will lead to a rotor angle of the magnetic field makes the direction of a rotor and the stator's magnetic field direction. When the stator magnetic field vector rotating at an angle. As the rotor magnetic field is also transferred from another perspective. An electrical pul for each input, the motor turning a point forward. It is the angular displacement of the output and input the number of puls proportional to speed and pul frequency is proportional to. Power to change the order of winding, the motor will rever. Therefore, the number of available control pul, frequency and power the motor windings of each pha in orde
r to control the stepper motor rotation.
Reaction Stepper Motor
As the respon to stepping motor works is relatively simple. The following describes the first principle of three-pha stepping motor respon.
1, the structure: uniformly distributed rotor with many small teeth, the stator excitation windings of three teeth, the geometric axis of the rotor tooth axis in order were staggered. 0,1 / 3 て, 2 / 3 て, (adjacent to the two axes of the rotor tooth pitch distance between the て said), that is, with the teeth a relatively homogeneous A, B and staggered tooth 2 to the right 1 / 3 て, C and the right to stagger tooth 3 2 / 3 て, A 'and the tooth 5 is relatively homogeneous, (A' is A, is the gear teeth 5 1) The following is the rotor's expansion plan:
2, rotation: If the A-pha power, B, C pha is not energized, the magnetic field, alignment of teeth 1 and A, (without any power of the rotor are the same the following). Such as the B-pha power, A, C pha is not energized, gear 2, and B should be aligned, when the rotor over to the right 1 / 3 て, this time offt teeth 3 and C 1 / 3 て, teeth 4 and A shift (て -1 / 3 te) = 2 / 3 て. Such as the C-pha power, A, B pha is not
energized, gear 3, and C should be aligned, this time right off the rotor Youxiang 1 / 3 て, 4 and A gear shift time is 1 / 3 て alignment. Such as the A-pha power, B, C pha is not energized, 4 and A-aligned teeth, the rotor Youxiang right over 1 / 3 て so after A, B, C, A are energized, gear 4 (ie, the previous tooth 1 teeth) to the A-pha, rotor to the right around a pitch, if you continue to press the A, B, C, A ... ... power, the motor for each step (per pul) 1 / 3 て, Rotate Right. Such as by A, C, B, A ... ... power, the motor to rever. This shows that: the location and speed of motor conduction times by the (number of puls) and frequency into one relationship. The direction determined by the conductivity of the order. However, out of torque, smooth, noi and reduce the angle considerations. Often with A-AB-B-BC-C-CA-A this conductive state, so that each step the original 1 / 3 て changed to 1 / 6 て. Even through different combinations of two-pha current, so 1 / 3 て into 1 / 12 て, 1 / 24, te, which is the basic theory of the motor-driven basis for subdivision. Easily introduced: m pha on the stator excitation windings, the axis of the rotor tooth axis were offt 1 / m, 2 / m ... ... (m-1) / m, 1. And conductivity at a certain pha quence reversing motor can be controlled - this is the rotation of the physical co
nditions. As long as we meet this condition can theoretically create any pha stepper motor, becau of cost, and many other considerations, the market generally two, three, four, five-pha is more.
3, the torque: the motor once energized, will produce between the stator and rotor magnetic field (magnetic flux Ф) when the rotor and stator stagger angle to produce force F and (dФ / dθ) is proportional to S the magnetic flux Ф = Br * S Br for the flux density, F and S for the magnetic area of L * D * Br core is proportional to L, effective length, D is rotor diameter Br = N • I / RN • I was excited winding ampere turns (current x turns) R for the magnetic resistance. Torque = force * radius of the torque and the motor turns the effective volume * An * is proportional to the flux density (only consider the linear state), therefore, the greater the effective volume of the motor, the greater the excitation ampere turns, the smaller air gap between stator and rotor, the motor torque, and vice versa.
