Fault phenomenon: stepper motor once started, the stepper motor drive external fuse burned, equipment can not run. Failure analysis: the maintenance personnel during the inspection, they found a power tube is damaged, but since there is no data, lost the role of the tube, the thought is driven power forward, put on a power tube, after electrify, insurance burned again and change of the tube is damaged. By professional maintenance personnel examination, initial analysis is right, namely insurance repeatedly fusing, drive certainly exist an unusually large current, and check out the damage of power tube. But is not clear for the role of the tube. In fact the pipe for step motor drive power, step motor for high voltage starting, thus to withstand high voltage large current. Static inspection, found that pulse annular divider circuit, the power supply to the side resistance is very small, but also not short circuit. According to the number of components in circuit power supply to the side resistance and power consumption analysis should not be so small, so doubt existing components of the circuit to be damaged. Electricity inspection, found a chip abnormal fever. After power will cut off the power supply pin of this chip and static checking, power supply to the ground resistance increases should belong to normal. Measuring the chip power to the ground resistance is small. Check the chip model for a non-standard type, manual, many did not. Confirmed by the line analysis, for the main components of the plate, the annular pulse distributor. To further confirm the chip problem, first of all in withstand voltage current power is pretty stepper motor power drive pipe, to restore the chip power supply pins, using leds to replace stepping motor's winding circuit simulated load. After electrify, leds are bright, namely each winding are electricity, it is not in conformity with the requirements of the line input step pulse response, imported pump troubleshooting: to confirm the chip has been damaged. But not on the chip market, under the condition of the drive casing space allows, using the combination circuit which USES existing d flip-flop at hand and the combination of the nand gate design an annular pulse generator, production on a small PCB, dismantling the original chips will small PCB by pin is installed on the original chip bonding pad. Still using light-emitting diodes as simulation load, after electrify plus one step pulse according to the phase sequence in turn to shine. Demolition of simulation load, access to the host, electricity, equipment running normally. This example illustrates, maintenance personnel should not only can analyze phenomena (Flow)To find out the obvious reason (Power tube damage)And at the beginning of every step of the analysis of the fault because of (Pulse generator damage)And be able to use existing components combined alternatives at hand is difficult to solve the problem of the device. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone:
