Use of LM331 and PMM8713 and SI -73004 planning four phase stepper motor drive circuit, the drive circuit has a secure job, the torque-speed characteristic in high efficiency and good characteristics, and applied to the numerical control plasma arc pressure higher system actively. Stepper motor is a kind of electrical pulses into angular displacement of the actuator, can through the manipulation of the pulse number to control the angular displacement quantity, and then reach the intention of the accurate positioning; Together to scroll through the manipulation of the pulse frequency to control motor speed and acceleration, and then reach the speed of intention. At present, the control of step motor are mainly composed of dispersion equipment annular pulse distributor, software annular pulse distributor, special integrated chip annular pulse distributor, etc. This plan, choose the third PMM8713 three-phase or four phase pulse distributor of stepper motor, SI -7300 a two phase or four phase power drive, a four phase stepper motor drive circuit, power integration and strong sex to progress. Hardware profile PMM8713 is Japan's sanyo electric company makes pulse distributor of stepper motor, suitable for manipulation of the three-phase or four phase stepper motor. Manipulation of the three-phase or four phase stepper motor can choose 3 kinds of excitation method, each phase minimum suction to pull out to 20 ma current, it not only satisfied after the input requirements of power amplifier, and embedded in all its input Schmitt trigger circuit, strong anti-jamming capability. In the internal circuit of PMM8713, some is used to set the clock gating of stepper motor is rotary pulse input. There are two kinds of PMM8713 pulse input method: double pulse input method and the single pulse input method. When choosing double pulse input method, CP, CU two input separation step motor are turning control pulse. Elected by single pulse input, the stepper motor is rotating direction by the U/D high resolution, low potential. Encourage method method to select to choose what kind of excitation control circuit. Encourage method judging circuit for output detection; And reversible ring counter is used to produce step motor in selected excitation method under the same timing signals. SI-7300 a layout and power drive principle of SI -7300 a is Japan's three green company makes high function of the stepper motor integrated power amplifier, the equipment for the single polarity four phase drive, choose SIPI8 encapsulation. Stepper motor power driver circuit can be divided into two kinds of voltage and current driven approach. Current driven approach is the most commonly used PWM constant current chopper driver circuit, which is the most commonly used methods of high function driver. LM331 chip LM331 is national semiconductor company makes dual-in-line 8 foot chip, only need to access a few external components can be easily constitute a voltage/frequency (V／F)Switch circuit. LM331 output frequency and input voltage contact which were as follows: fo = Vi/(IRtIRL)T sub>,; 1 punctual by external components Rt and Ct resolution, t1 = 1. 1 RTCT, IR by internal precision current source supply, IR = 1. 9V／Rs。 So the fo = ViRs/(2. 09年rtrlct)。 Rs for adjustable resistance, its role is to adjust LM331 gain error. Ct for filter capacitance, usually to 0. 01 ~ 0. U F, 1 case is in better filtering effect, can use 1 u F capacitance. In order to progress degree of accuracy and stability, group element to choose equipment of low temperature coefficient. Used for example use PMM8713 stepper motor ring distributor and S17300A stepper motor power amplifier planning a four phase stepper motor power drive circuit, PMM8713 adopt single pulse input, 1 -Two phase field method. PD control end for S17300A input current Io control end, can be hung up or high level, after high levels can be appropriately S17300A output current Io, dangling in the use of system application. By LM33l PMM8713 clock pulse input signal (V／F)Output, the direction and step motor start-stop control signal comparison circuit is given by the window. Window comparison circuit for step motor supply direction of control signal and the step motor start-stop control signal. Meanwhile, U1, U2 for CNC plasma cutting machine, arc pressure, the lower voltage Ui to detect the arc pressure. When the Ui > U1, V3 output for the high level, the V4 output for the low level, the V5 output for high level; V3 and V4 when U2 < Ui direction control signal output termination PMM8713 C/D, manipulation of the stepper motor is rotating; R U5 output termination PMM8713 reset end, start-stop control stepping motor. LMM331(V／F)Output fo PMM8713 CK, to supply step motor with pulse control signal. Thus, when U2 < Ui < U1, V5 output for the low level, step motor movement; When the Ui > U1 perhaps Ui < U2, V5 output for the high level, step motor sports (Stepper motor is rotating direction control signal manipulations)To U2 < Ui < U1 range, then make sure that the Ui is always located U2 < Ui < Ul range. The driving circuit is used in the numerical control plasma arc cutting machine pressure initiative to raise the system, the system of the motor is 42 byg009 type hybrid stepping motor, the driving voltage for dc 24 v. Through the practice proved that the step motor power drive circuit control system layout is simple, function stability, the torque-speed characteristic in high efficiency, good, can be widely used in small electromechanical integration equipment. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
