Electrical engineer driver amplifier

In electrical engineer concluded driver amplifier including logical explanation module and current amplification module. Driving amplifier accept stepper pulse, the direction signal input, such as output in the two groups (or groups) controlled current to two (or more) of the motor winding. Logical explanation module according to user's PC from stepping pulse and direction signals and offline, make each coil winding current switch in turn, so that the stepper motor rotor spinning. The motor works only two kinds of control engineering net all rights reserved, namely the whole work step and half step, step Angle is determined by the motor structure. When the basic step Angle can't meet the requirements, need to be subdivided driving. Where each input pulse switch, without current rotor cutting machine all-pass or broken, but only change the corresponding part of the winding current, thus the rotor are only part of the basic step is apart from the Angle of rotation. Segmentation function by precise control of motor phase current generated by the driver, has nothing to do with the motor. After segmentation, relatively stable output current change, to some extent, improve the output torque, reduce the low frequency oscillation of motor, improving precision permanent magnet motors for sale of step distance. Specific depending on the degree of segmentation and improve the quality of the driving circuit.

For good quality motor, generally more than 16 ~ 32 subdivision has no significant effect, but may slightly reduce the www.dongfeng-motor.com vibration and noise. Current amplification module logic signal amplification into working current. More commonly used is made up of field effect tube H bridge circuit. Field effect tube can be an electronic switch control engineering net all rights reserved, like the light switch. The use of this type on-off switch to adjust the current commonly used way is chopping constant current. Constant current is constant current. Chopper is cut need higher current wave. To a leaking water in the cup, for example, such as the speed is greater than the water leakage of water, sugar, and so as to avoid overflow. The field effect tube opening, the current rise. When the current just over, field effect tube shut off, the electricity was cut, fall off. Dropped to below setting, open field effect tube again, current rise again. Repeatedly switch with motor coil inductance, current stays at the set value. Need to point out that some of the driver amplifier calorific value (temperature) is not very big, some are small. The main reason is that most of the field effect tube hundreds of milliohm resistance are. Most optimal company Shanghai drive field effect tube resistance between 10-30 milliohm, so much smaller calorific value than ordinary drives. The surface temperature of the drive is associated with heat and heat dissipation area. Shanghai optimal abro drives due to the small size (matchbox size), so although the calorific value is very small (typically less than 1-2 w), but in some large current (4 to 8 a) the workplace, still need to install it on the offer of flange and fixed on the motor or the cabinet to heat dissipation.