Stepper motor is controlled by what, the inverter can not control it, say detailed points
In foreign countries, two phase hybrid stepping motor and corresponding subdivision driver are mainly used in stepping system. But in China, the majority of users of "segmentation" is not particularly understand, just think, in order to improve the accuracy of segmentation is, in fact, is mainly to improve the performance of motor operating segments, is as follows: the breakdown of stepper motor control by the drive control phase current stepper motor to realize, in the second phase motor as an example, if the motor rated current is 3A, if we use a conventional drive (such as the commonly used constant current chopping) the motor drive motor, each operation step, the current in the winding will be from 0 to 3A or 3A mutation mutation from to 0, great changes of the phase current, will cause vibration and the noise of motor operation. If the use of sub drive, the motor drive in the 10 segments of the state, every operation of a micro motor, the winding current change of only 0.3A rather than 3A, and the current is a sine curve changes, thus greatly improve the vibration and noise of motor, therefore, the advantages in performance is the real the advantage of subdivision. Due to the precise control of the phase current of the motor, the driver must have high technical requirements and technical requirements, and the cost will be higher. Attention, some domestic drives use "smooth" to replace subdivision, and some also known as "subdivision", but this is not a true segmentation, and hope that the majority of users must distinguish the essence of the difference between the two:
For more than 57 of the control method of stepper motor driver generally adopts a special closed loop current control method of motor control, including hysteresis, mixed attenuation, current analog PI, digital control method. At present, the best control method is to adopt the DSP controlled all digital stepping driver, which can restrain the vibration and noise of the stepping motor, and the heating, and greatly improve the running performance of the stepping motor
No current loop control, motor control is simple, but the effect is poor, generally in the appliance or less demanding applications; if the small probability step performance requirements are relatively high, can use special chip to control, generally use the mixed attenuation method to realize the current closed-loop control, but the working voltage and current are compared low, 42 main driving small motor
Stepper motor control is generally divided into several: small power stepper motor, generally using SCM + power pipe direct control, but this control is usually a whole step control
