Introduction: The pace regards control as used special type electric machinery into electric machinery, it is the actuator angular displacement of electric pulse translate into. Receive signal of a pulse into driver when the pace, the angle that the direction that it presses set into electric machinery with respect to drive pace turns one is secured (call " step pitch horn " ) , into angle with fixed pace one pace runs its whirl. · pace regards control as used special type electric machinery into electric machinery into pace of electric machinery principle, it is the actuator angular displacement of electric pulse translate into. Receive signal of a pulse into driver when the pace, the angle that the direction that it presses set into electric machinery with respect to drive pace turns one is secured (call " step pitch horn " ) , into angle with fixed pace one pace runs its whirl. Can pass control pulse number will control angular displacement amount, achieve the goal of exact location thereby; Can control the speed with rotational electric machinery and acceleration at the same time through controlling pulse frequency, achieve the goal of timing thereby, the electrify that changes winding is ordinal, electric machinery can invert. Driver principle pace needs to use appropriative pace to take drive of electric machinery driver into electric machinery, driver controls the composition such as unit of driving unit of unit, power, protection by pulse happening. Power driving unit controls pulse happening the pulse enlarge that unit generates, enter electric machinery with the pace direct coupling, belong to a pace to enter the power port of electric machinery and small controller. Control instruction unit, receive pulse and directional signal, corresponding pulse produces control unit correspondence to generate the pulse that a group of corresponding photographs count, enter electric machinery to the pace through evacuation of power driving unit, the pace enters electric machinery to had turned on corresponding direction horn of a step pitch. The pulse of driver gave means to decide the pace enters electric machinery run mode, following: (1) M photograph odd M is patted move (2) M photograph double M is patted move (3) M photograph sheet, double M is patted move (4) fractionize drive, need driver gives out the drive signal pace of different amplitude has a few important technology data into electric machinery, wait like the biggest static torsion, starting frequency, running frequency. Generally speaking step pitch part is smaller, the biggest static torsion jumps over electric machinery big, start frequency and running frequency taller, fractionize drive skill emphasized in run mode so, this means raised a pace to submit the rotational moment of force of electric machinery and resolution, eliminated the low frequency oscillation of electric machinery completely. So function of fractionize driver drive actors or actress with other type driver. The rotor of interior of servo electric machinery is permanent magnet, report of three-phase of driver pilot U/V/W forms electromagnetism field, rotor is rotational below the action of this magnetic field, at the same time electric machinery gives drive from the coder feedback signal of the belt, driver undertakes comparative according to feedback value and target cost, adjust the angle with rotational rotor. Electromotor of servo of principle of electric machinery of servo of · servo electric machinery says to carry out electromotor again, in automation system, use as executive component, the electric signal that gets place is changed into the angular displacement on electromotor axis or angular velocity to output. Cent is dc and communication servo electromotor two kinds big. Servo electric machinery receives a pulse, can rotate the angle of correspondence of a pulse, realize displacement thereby, because, itself of servo electric machinery has the function that gives out pulse, so servo electric machinery every rotate an angle, can give out the pulse of corresponding amount, such, the pulse that accepts with servo electric machinery formed closed circuit, the system can know to send how many pulse to give servo electric machinery, received how many pulse again at the same time, such, can the very accurate roll that dominates electric machinery, realize exact location thereby. Compare on function, communicate electric machinery of servo of dc of excel of servo report confidential, communication servo electric machinery uses sine wave control, torsion is pulsatile small, the capacity can be compared big. Dc servo electric machinery uses echelon wave to control, relatively a few poorer. Do not have in dc servo electric machinery brush servo electric machinery to brush function of servo report confidential to be close friends than having. The rotor of interior of electric machinery of servo of driver of servo electric machinery is permanent magnet, report of three-phase of driver pilot U/V/W forms electromagnetism field, rotor is rotational below the action of this magnetic field, at the same time electric machinery gives drive from the coder feedback signal of the belt, driver undertakes comparative according to feedback value and target cost, adjust the angle with rotational rotor. · has brush driver of dc servo electric machinery: The working principle of electromotor and common dc electric machinery are identical, driver is structure of 3 closed circuit, from inside voltaic annulus, speed annulus, position annulus is respectively outside arriving. The output of voltaic annulus controls the armature voltage of electric machinery, the input of voltaic annulus is the output of speed annulus PID, the input of speed annulus is the PID output of positional annulus, the input of positional annulus is to give an input namely, dominate picture of principle graph as above. · does not have brush driver of dc servo electric machinery: Power supply source is dc, become the alternating current of U/V/W through in-house three-phase inverter inversion, supply electromotor, driver uses structure of 3 closed-loop control likewise (voltaic annulus, speed annulus, position annulus) , drive control principle is Alexandrine. · communicates driver of servo electric machinery: The power that can differentiate roughly to compare independence for the function board with control plate two module, control plate outputs PWM signal through corresponding algorithm, regard the drive of drive circuit as signal, will change the output power of inverter, in order to achieve the goal that synchronism of control three-phase magneto communicates servo electric machinery. Power driving unit works galvanic way through three-phase complete bridge above all the three-phase report to the input or town report undertakes rectification, get corresponding dc. Through the three-phase report with good commutate or town report, frequency conversion of voltage of PWM of repass three-phase sine inverter comes synchronism of drive three-phase magneto communicates servo electric machinery, say be AC-DC-AC simply to change shed a process. Controlling unit is the core of whole communication servo, realize systematic position control, speed control, torsion and voltaic control. Servo electric machinery and pace compare A into the function of electric machinery. Control precision: The photograph number that the pace takes electric machinery and number of beats are more, its definition is higher, servo electric machinery is taken piece at the coder that takes oneself, the scale of coder is more, precision is taller; B.
Low frequency character: The pace appears easily when low speed into electric machinery phenomenon of low frequency vibration, when it the job uses damp technology commonly when low speed or fractionize technology overcomes phenomenon of low frequency vibration, movement of servo electric machinery is very smooth, although be when low speed,also won't appear oscillatory phenomenon; C.
Quadrature frequency is characteristic: The pace outputs pitching moment to lift and drop along with rotate speed into electric machinery, the meeting when high speed drops quickly, servo electric machinery is output of constant moment of force inside rated rotate speed, constant power output is on rated rotate speed; D.
Overload ability: The pace does not have overload capacity into electric machinery, servo electric machinery has stronger overload capacity; E.
Moving function: The pace is open loop control into the control of electric machinery, exorbitant or the frequency that start is laden the phenomenon that loses pace or locked-rotor easily greatly too, the rotate speed when stopping is exorbitant easy had appeared to develop a phenomenon, system of communication servo drive is closed-loop control, driver can feedback to electric machinery coder directly signal undertakes sampling, interior makes positional annulus and speed ring, won't appear commonly the lose a condition or rushs too appearance that the pace takes electric machinery, control function is more reliable; F.
Speed answers function: The pace stops to need about a hundred millisecond to working rotate speed quickly into electric machinery Cong Jing, and the acceleration that communicates servo can be better, need a few millisecond only commonly, can control a circumstance with what stop at asking to be opened quickly. CNC Milling
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