Does anyone know how to overhaul the Type 02 stepper drive?

Summary. Hello pro-stepper driver failure cause of failure: electrostatic discharge (poor working environment).

Troubleshooting method: First, connect the PE in the electrical cabinet with the ground, if there is still a fault, the drive module is damaged, and the drive module is replaced. Causes of motor stall failure at high speed:

Drivetrain design issues. Exclusion method: If the feed rate is 85%, the high-speed jog is not blocked, and the polyline acceleration characteristic is used; Reduced maximum feed rate; Replace the fire torque stepper motor.

The positioning accuracy of the transmission system is unstable, and the cause of the failure: the mechanical assembly problem of the transmission system.

Hello pro, we are glad to answer this question for you, stepper motor driver repair method.

Hello pro-stepper driver failure cause of failure: electrostatic discharge (poor working environment). Exclusion Method:

First of all, connect the PE in the electrical cabinet with the rough bridge, and if there is still a fault, the drive module rock tremor is damaged, and the drive module is replaced. The cause of motor stall failure at high brightness reduction speed: transmission system design problem.

Exclusion method: If the feed rate is 85%, the high-speed jog is not blocked, and the polyline acceleration characteristic is used; Reduced maximum feed rate; Replace the fire torque stepper motor. The positioning accuracy of the transmission system is unstable, and the cause of the failure:

This drivetrain mechanical assembly problem.

The stepper motor is an open-loop control motor that converts the electrical pulse signal into angular displacement or linear displacement, and is the main executive element in the modern hand difference cover digital program control system, which is widely used. Its working principle is to use electronic circuits to turn direct current into time-sharing power supply, multi-phase timing control current, use this current to supply power to the stepper motor, stepper motor can work normally, the driver Qingkuan is for the stepper motor time-sharing power supply, multi-phase timing controller.

1.The first step in repairing the stepper motor skin caller should be to check the power supply system of the equipment and confirm whether the power supply voltage is consistent with the requirements of the equipment; 2.Check the power interface of the module to confirm whether the interface is in good contact. 3.

Check the insulation resistance of the stepper motor driver to confirm whether its value meets the requirements; Harushin 4Check the input and output lines of the equipment to confirm whether the circuit is open or short-circuited; 5.Check the control circuit of the equipment to confirm whether the input and output signals of each controller meet the requirements of Ransen Kaihe; 6.

Check the current controller of the stepper motor driver to confirm whether the current control chip can work normally; 7.Check the stepper motor of the stepper motor driver to confirm whether the motor is damaged or has poor connection contact; 8.Check the topology of the stepper motor driver to confirm whether there are jumpers or poor contacts in the circuit; 9.

Check the thermal protection device of the stepper motor driver to confirm whether the thermal protection chip can work normally; 10.Check the safety protection device of the stepper motor driver to confirm whether the safety protection chip can work normally.

Once the phenomenon of burning MOS tube in the stepper motor driver is started, the external fuse of the driver will be burned out, and the equipment cannot be operated. During the inspection, the maintenance personnel found that a power tube had been damaged, but because there was no information, they could not figure out the role of the tube, thinking that it was the pre-push of the power drive, and replaced it with a power tube.

Figure 1: The MOS tube of the stepper motor driver has been repaired and inspected, and the initial analysis is correct, that is, the fuse has been repeatedly fused, and there must be an abnormal high current in the driver, and a power tube is damaged. But the effect of the tube is not clear.

In fact, the tube is the power drive tube of the stepper motor, and the stepper motor is started at high voltage, so it has to withstand high voltage and high current. Static inspection found that in the circuit of the pulse ring distributor, the resistance value of the power supply to the ground terminal is very small, but there is no short circuit.

According to the number of components in the line and their power consumption, the resistance value of the power supply to the ground terminal should not be so small, so it is suspected that the existing components in the line are damaged. The power check found that a chip was abnormally heated. After the power is off, cut off the power pin of the chip, and the static check should be normal, and the resistance of the power supply to the ground should increase.

The resistance of the power supply to the ground of the chip is very small. Check the model of the chip, it is a non-standard model, which is not found in many manuals.

After circuit analysis, it was confirmed that it was the main component in the board: the ring pulse distributor. In order to further confirm the problem of the chip, firstly, the power supply drive tube of the stepper motor with the same withstand voltage current power was replaced, the power supply pins of the chip were restored, and the light-emitting diode circuit was used to replace the windings of the stepper motor as the simulated load.

After powering on, the light-emitting diodes are all on, that is, all windings are energized, which does not meet the requirements of the line, and the input step pulse is not reacting, so it is confirmed that the chip is damaged.

However, there is no such chip on the market, and when the space in the driver housing allows, a ring pulse generator is designed by using the combination of the existing D flip-flop and the NAND gate on hand, which is made on a small printed board, and the original chip is dismantled and the small printed board is mounted on the pad of the original chip through the pins. The light-emitting diode is still used as the analog load, and the stepping pulse is added after the power is turned on, and the light is emitted in sequence according to the phase sequence. The simulated load is removed, the host is connected, the power is on, and the equipment is running normally.

a. If the stepper motor is working in the resonance area, the running speed of the stepper motor can be increased by changing the reduction ratio.

b. Adopt the driver with subdivision function, which is the most commonly used and easiest method. This is because the phase current of the segmented drive motor changes more gently than that of the half-step type.

c. Replace the stepper motor with a smaller step angle, such as a three-phase or five-phase stepper motor, or a two-phase subdivision stepper motor.

d. Replacing with DC or AC servo motor can almost completely overcome the vibration and noise of the belt barrier, but the cost is higher.

e. Add a magnetic damper on the motor shaft, which is already available on the market, but the mechanical structure has changed greatly.

Let me talk about the experience.

I use the L297 stepper motor drive to control the L298N, and the L298N to drive the stepper motor, and my spec is a 42 stepper motor, so I need to use the L298N to drive a little better.

First of all, the problem is that it does not turn up, and it may be the following problems.

1；The phase sequence is wrong, this is the easiest to find and change, the general phenomenon of the phase sequence is not right, it is vibration, no rotation, and the motor is heated.

2；The delay is not right, the stepper motor needs the appropriate driving frequency, otherwise it will lose step or vibrate very badly.

3；During debugging, I found that the insulating paint under the heat sink of my L298N driver was aging and losing its insulation characteristics, which caused my L298N to short circuit, so it heated up when I connected it.

4；Another issue I found was that two of my jumpers were connected incorrectly, causing problems with my L298.

Troubleshooting first depends on what problems occur in the process of using your board, such as when heating, you first need to use a multimeter to detect whether there is a short circuit;Use a multimeter (preferably an oscilloscope) to see if the electrical power for each pin meets your requirements;See if there is any false welding, or if it is not welded firmly;Generally speaking, the best way to avoid problems is to be careful when drawing the board and soldering the board, and be sure to check it after soldering, (especially pay attention to the situation that the chip needs to be connected to an external RC or other oscillator, see if the provided clock meets the conditions, try to put the oscillator close to the pin of the device, reduce EMC interference) because of hardware and software problems, you don't know which one is wrong, and you can't debug it after a blind meal.