Stepping motor automatic half current circuit

 Stepper motor to reduce the fever, will www.dongfeng-motor.com reduce the copper loss and iron loss. motor parts Reducing the copper loss is reduced, resistance and current requirements in the selection as far as possible choose small resistance and the rated current of the motor, but this often conflict with the moment and the requirement of high speed. For selected motor, first of all, should make full use of the drive of automatic flow control function and offline function, automatic half flow automatically reduce current when motor is static, offline function is to cut off the output motor current; Second, subdivision driver due to the current waveform is close to sine, less harmonic, electric heating will be less. To reduce iron loss associated with motor drive voltage, high voltage driver motor will bring high speed characteristics of ascension, but also bring the increase of the heat. We should choose the appropriate drive voltage grade, recommend suite, give attention to two or morethings stationarity and fever, such as noise indicators. 


To minimize motor sends, need TB6560 TQ2 and TQ1 pin level when the motor work is set to the maximum output current, the motor current in half or less when not working, so called "automatic half flow circuit". After the maximum output current, are defined with the NFA, NFB via TQ2 and TQ1 set current ratio of the output, is set fan motor to 00, 01, 10 and 11, the output current is the maximum current respectively 100%, 75%, 50%, 25%. Change of motor drive current, will change the size of the motor output torque. Automatic half flow circuit design with repeatable triggered monostable circuit chip 74 ch123, with motor drive pulse CLK as monostable trigger circuit. Monostable circuit reverse pick TQ2 output pin, when the motor driven lamination pulse TQ2 has kept a low level, no drive pulse maintain a high level. In figure 2 circuits, TQ1 connect three jumper cap. Connect a jumper wire 1, TQ2, TQ1 as high or low level all the time, drive current switch in 25% ~ 100%; Jump line 2, TQ2 is always low, current switch in 50% ~ 100%; After jump line 3, the current switch in 25% ~ 75%. Can choose different jump line according to the needs of work drive current.