Stepper motor driver Principle（步进电机驱动器原理）
表弟的英文1, the stepper motor is a special motor as control, it is the rotation of the fixed point (called "step") operation step by step, which is characterized by no accumulated error (accuracy of 100%), so it is widely ud in a variety of open-loop control. Stepper motor operation to have an electronic device driver, this device is the stepper motor drive control system, it is a pul signal into angular displacement, the stepper motor or the control system: each made of a pul signal, the driver makes a step angle stepper motor rotation. Therefore, the speed of the stepper motor is proportional to the frequency of the pul signal. Therefore, to control the frequency of the stepped pul signal, the motor can be adjusted accurately. The number of step puls can be controlled to locate the motor precily;
网速突然变慢
2, driven by stepping motor subdivision driver, the step angle becomes small, such as the driver operates in 10 gments of the state, the step angle only for "natural" 1/10 step motor, it is said: "when the driver operating in gments of the whole step state, the control system of each a stepper motor pul, rotate 1.8 degrees; and subdivision drive work in 10 gments when the motor rotation only 0.18 degrees", this is the basic concept of subdivision. The subdivision function is entirely generated by the pha current of the drive by precily controlling the motor, independent of the motor.
3, what are the advantages of driver gmentation, and why is it necessary to u subdivision functions?
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玉米粒炒饭The main advantage of driver subdivision is that the low幻剑术
frequency oscillation of the motor is completely eliminated. Low frequency oscillation is a stepper motor (especially reactive motor) the inherent characteristics, and is the only way to eliminate the subdivision of it, if you step motor sometimes work in the resonance region (such as walking, arc) is the only choice to choo driver. The output torque of the motor is improved. Especially for three-pha reactive motors, the torque ratio increas by about 30-40% without subdivision. The resolution of the motor is improved. Becau of reducing the step angle and increasing the uniformity of the step distance, it is lf-evident that the resolution of the motor is incread.
Basic knowledge of stepper motor drive systems
1. Common n of the system: stepping motor and stepping motor driver constitute stepping motor drive system. The performance of the stepping motor drive system depends not only on the performance of the stepper motor itlf, but also on the performance of the stepper motor driver. The rearch of stepping motor driver is almost synchronous with the rearch of stepping motor.
2. System overview: stepper motor is an electrical pul into angular displacement of the implementation of components. When the stepper motor driver receives a pul signal (from the controller), it drives the stepper motor to t the direction of rotation of a fixed angle (called "step"), it is the rotation of the fixed point of the operation step by step.
3, system control: stepper motor can not be directly connected
to DC or AC power supply, you must u a dedicated drive power (stepper motor drive). The controller (pul generator) through a control pul to control the amount of angular displacement, so as to achieve the purpo of accurate positioning; at the same time by controlling the pul frequency to control the motor rotation speed and acceleration, so as to achieve the purpo of speed.
4, u: stepper motor is a special motor control, as the actuator, electromechanical integration is one of the key products, along with the development of microelectronics and computer technology (stepper motor drive performance improvement), demand for stepper motor grow with each passing day. Stepping motor has no accumulation error in operation, so it is widely ud in various automatic control systems, especially open-loop control system.
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情操5, stepper motor classification according to the structure: stepper motor is also called a pul motor, including reactive stepping motor (VR), permanent magnet stepper motor (PM), hybrid stepping motor (HB) and so on.
(1) reaction stepping motor: also called induction type, hysteresis type or reluctance type stepping motor. The stator and rotor are made of soft magnetic material,
The uniform distribution of large magnetic pole on the stator with multipha excitation winding, stator and rotor evenly distributed around the teeth and grooves, permeability changes using electricity generated torque. Is generally three or four, five or six pha; can achieve high torque output (larger power
consumption, current up to 20A, higher driving voltage); small step angle (the minimum can be 10 '); power without cogging torque; small damping motor, single step operation (the pul frequency is very low when the shock takes a long time to start); and the operation of high frequency.
(2) permanent magnet stepper motor: motor rotor compris a permanent magnetic material, a multipha excitation winding stator is made of soft magnetic materials, stator and rotor teeth and no surrounding groove, energized by permanent magnet and stator current magnetic field interact to pro
duce torque. Usually two or four; the output torque is small (smaller power consumption, current driving voltage is less than 2A, 12V); large step angle (e.g. 7.5 degrees, 15 degrees, 22.5 degrees and so on); power has a certain torque starting and operating frequency is low.
(3) hybrid stepping motor: also called permanent magnet reaction type and permanent magnet induction stepping motor. It combines the advantages of permanent magnet and reaction type. The stator and the four pha step motor (but no difference between the two magnetic poles of the same pha, and the two pole winding of N produced, S must have the same polarity), the rotor structure is more complex (rotor internal cylindrical permanent magnet, two coats of soft magnetic materials, the surrounding denticulate and groove). Usually two or four; to supply positive and negative pul signal; the output torque is large (permanent magnet power consumption is relatively small); a permanent magnet small step angle (typically 1.8 degrees); power without positioning torque; starting and running high frequency; is the development of a
狗的简笔画怎么画rapid step motor.
6, stepper motor classification according to the way of operation: can be divided into power and rvo type two.
(1) power type: output torque is larger, can directly drive larger load (general u reaction type, hybrid stepping motor).
(2) rvo type: the output torque is small and can only drive smaller loads (usually using permanent magnet and hybrid stepping motors).
7, the choice of stepper motor:
(1) first lect the type, followed by the specific varieties and models.
(2) the reaction type and permanent magnet type and three kinds of hybrid stepping motor performance, dimensions, installation methods, types of pul power supply and control circuit are different, the price difference is also great, when the choice should be considered.
(3) stepping motor with control IC should be given priority.
8. Basic parameters of stepping motor:
(1) the intrinsic step angle of the motor: it reprents the angle of rotation of the motor when each step of the control system nds a pul signal. The factory motor gives a step angle value, such as 86BYG250A type motor is given a value of
