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ive -phase and three-phase motor is completely

Symmetrical, more dominance . In respect of these two motors , the five-phase motor driving circuit of sophisticated and complex than the three-phase motor , three-phase motor system so than the five-phase motor price lower.
DDS technology in stepper motor control system application . The stepping motor speed and a pulse signal proportional to the frequency . Direct Digital Synthesis (DDS: Direct DigitalSynthesizer)) technology capable of generating the input value changes linearly with the frequency , with frequency conversion time is short, high frequency resolution, low phase noise output , programmable features.

The use of DDS technology to produce stable, reliable , high-precision stepper pulse , ideal for those who require precise speed control system . Such as the U.S. QUALCOMM 's Q2334, Q2220; STANFORD company STEL-1175, STEL-1180; AD 's AD7008, AD9850, AD9854 , etc. , the clock frequency from tens of megahertz to several megahertz , ranging from general features to the chip integrated D / A converter and quadrature modulators are . DDS technology research in domestic and international standards on there is a large gap between the chip industry with the development of our country in recent years , DDS technology in the application of the stepping motor breakthrough .

Stepper motor acceleration and deceleration runs automatically Research . Stepper motors are widely used in printers , engraving machines , plotters , embroidery machines and automation instrumentation systems. A common feature of these systems is to require precise positioning , namely in the movement , but without losing steps and punch . Stepper motor automatic deceleration control scheme , the core content is based on the stepper motor to run automatically select the total number of steps and the highest a deceleration rate of progression , but must ensure that control its accuracy. To avoid the step stepper motor , the motor torque must be adapted to frequency characteristics of a speed control program, which starts with a low speed , gradually accelerated to a speed , then gradually slow down until it stops. Intelligent controller stepper motor acceleration and deceleration running application has important practical value.

High-performance stepper motor power supply technology. Computer-controlled stepping motor in the small and medium sized machine tools and other automation devices made widely used. Stepping motor and general AC , DC motors are not the same, the latter is often a standard power supply AC , direct supply , as long as the voltage level and the size of the given motor parameters are equal , there is determined the performance of the motor substantially . The stepping motor power supply , in many cases, a DC switching power supply . Stepper motor performance largely depends on the performance of drive power . The current research focus has chopper constant current control , SPWM ( sinusoidal pulse width modulation ) , etc., plus the driver circuit chip peripheral circuits commonly used , or even dedicated DSP chip to generate SPWM SPWM wave to control the amplifier circuit switch -off . Stepper motor drive circuit for a power possession GTR, VDMOS and IGBT etc. Especially the drive and protection circuits integrated intelligent power module , due to simple structure , stable and reliable operation , stepper motor drive unit is the f