What is the control of the frequency converter
Stepper motor control points several commonly: small power stepping motor generally + power tube directly by single chip microcomputer control, but this does not control the whole step control, does not carry on the current closed loop control, control is simple, but the machine effect is poorer, generally in the home appliances or request is not high application occasions; If required by the step running effect of small probability is higher, can use special chip to control the general current closed-loop control is realized by using hybrid attenuation method, but the working voltage and working current is lower, the main drive, 42 small motor etc; For stepper motor general over 57 special drive control method was adopted to realize closed loop control of motor current, control methods including hysteresis comparison, attenuation, current analog hybrid PI, full digital control method. The best control method is to use DSP control all-digital stepper drive, can have inhibition of the stepper motor vibration and noise, and fever, improved the performance of the step
It is controlled by the driver of the step motor. The main function of step motor drive breakdown is to improve the precision of stepping motor. It usually subdivided by 2, 4, 8, 16, 16, 32,62,128,256,512... In foreign countries, the step system is mainly adopted by the two-phase hybrid step motor and corresponding subdivision drive. But in domestic, the masses of users to understand "segmentation" is not special, just think, segmentation is in order to improve the accuracy, actually otherwise, segmentation mainly is to improve the performance of the motor, the instructions are as follows: stepping motor subdivision control is precisely controlled by the driver of stepping motor phase current, the two-phase motor, for example, if the rated current of motor is 3 a, if you are using a conventional drive (such as a common mode of constant current chopper) driving the motor, every step motor running, in its winding current will mutations from 0 to 3 a or 3 a mutation to 0, the great changes in phase current, is bound to cause vibration and noise of motor running. If using subdivision driver, under the conditions of 10 subdivision drive the motor, step motor each run A micro, current changes in the winding is only 0.3 A, rather than 3 A, and the law of electric current is A sine curve changes, thus greatly improve the motor vibration and noise,
The controller (control card) sends the pulse to the driver, which drives the step motor.
