Special motor, stepping motor as control with is converts electrical pulses into angular displacement of the actuator. When stepping drive receives a pulse signal, it drives stepper motor according to set the direction of a fixed point (Called & other; Interval Angle & throughout; ), its rotation is a fixed step Angle step by step. Can be controlled by controlling the pulse number of angular displacement, so as to achieve the purpose of accurate positioning; As well as by controlling the pulse frequency to control motor rotation speed and acceleration, so as to achieve the purpose of regulating and changing winding current order, the motor will be reversed.
drive principle of stepper motor need to use special stepper motor driver, drive is controlled by pulse generating unit, power drive unit, protection unit, etc. Power drive unit control pulse generating unit generates pulse amplification, directly coupled with stepper motor, belonging to the stepper motor with the power interface of microcontrollers.
control instruction unit, receives the pulse and direction signals, the corresponding pulse generating control unit generates a set of corresponding phase Numbers corresponding pulse, after power drive unit sent to the stepper motor, stepper motor in the corresponding direction turned a step Angle. Drive pulse given way to determine the stepper motor operation mode, the following: (1)M phase single m running (2)M phase double m running (3)M phase of single and double m running (4)Subdivided driving, need to drive different amplitude of driving signals are given stepper motor has some important technical data, such as the maximum static torque, start frequency, frequency, etc. In general step distance, the smaller the Angle, the greater the maximum static torque, start frequency and the higher operation frequency, so the operation mode of emphasizing the subdivided driving technology, the way to improve the stepping motor rotation torque and resolution, completely eliminate the low frequency oscillation of the motor. So subdivision driver driving performance optimization and other types of drives. the inside of the servo motor rotor is a permanent magnets, drive control of U/V/W three-phase electric form of electromagnetic field, under the action of rotating rotor in this field, at the same time, the motor with encoder feedback signal to drive, drive according to the feedback value compared with the target, adjust the Angle of the rotor rotation.
▌ servo motor servo motor principle motor servo motor is also called the implementation, in the automatic control system, used as actuators, and convert the received electrical signal to the motor shaft angular displacement or angular velocity on output. Divided into two major categories of dc and ac servo motor. servo motor receives a pulse, will rotate one pulse of the corresponding point of view, so as to realize the displacement, because, the function of the servo motor itself has a pulse, so each rotation Angle of a servo motor, send out the corresponding number of pulses, in this way, and servo motor pulse formed a closed loop, the system will know how many pulses sent to the servo motor, how much charge pulse back again at the same time, in this way, can be very precise control of the motor rotation, so as to realize accurate positioning. in performance comparison, ac servo motor is superior to the dc servo motor, ac servo motor is controlled by sine wave, small torque ripple, capacity can be relatively large. Dc servo motor controlled by trapezoidal wave, relatively less. Brushless dc servo motor servo motor performance is better than a brush servo motor.
servo motor servo motor drives the internal rotor is a permanent magnets, drive control of U/V/W three-phase electric form of electromagnetic field, under the action of rotating rotor in this field, at the same time, the motor with encoder feedback signal to drive, drive according to the feedback value compared with the target, adjust the Angle of the rotor rotation.
brushless dc servo motor driver are: the working principle of the motor are exactly the same, and common dc motor drive for the three closed loop structure, from inside to outside, respectively, for the current loop, speed loop and position loop. The output of the current loop control of the motor armature voltage, current loop of the input to the output of the speed loop PID, the input for the position loop speed loop PID output, input position loop is a given input, the control principle diagram as shown above. brushless dc servo motor drive, power supply for dc, through internal three-phase inverter inverter into the U/W/V alternating current (ac), supply motor, drive also adopts three closed-loop control structure (Current loop, speed loop and position loop)To the above drive control principle. ac servo motor drive, can be roughly divided into function is independent of the two modules, power panel and control panel control panel output PWM signals through the corresponding algorithm, as a drive circuit of the drive signal, to change the output power of inverter, and control in order to achieve the purpose of the three-phase permanent magnet synchronous ac servo motor. power drive unit, first of all, through three-phase bridge rectifier circuit three-phase mains electricity or of input rectifier, direct current can be calculated. After rectifying good three-phase mains electricity or by three-phase sinusoidal PWM voltage type inverter frequency to drive the three-phase permanent magnet synchronous AC servo motor, AC - simpleDC -The AC converter process. the control unit is the core of the ac servo system, to realize the position control, speed control system, torque and current control. ▌ servo motor and stepper motor performance comparison: control precision stepper motor phase number and take several more, its precision is higher, the servo motor to take to bring their own piece of the encoder, the scale of the encoder, the more the higher accuracy;
