What are the common problems of DC Servo motor driver?

2021-11-03 10:00:49 jact_elec

What are the common problems of DC Servo motor driver?

DC Servo motor driver,which includes stator, rotor core, motor shaft,servo motor winding commutator, servo motor winding,tachometer winding,tachometer motor commutator,the rotor core is laminated and fixed by silicon steel punching It is formed on the motor shaft.

Jact-China DC servo motor manufacturer,and also Servo driver Brand Agent. From a professional point of view, I will summarize the possible problems of the DC servo motor.

The driving principle of the 48V DC motor: servo mainly depends on pulses for positioning. Basically, it can be understood that when the servo motor receives 1 pulse, it will rotate the angle corresponding to 1 pulse to achieve displacement, because the servo motor itself has the ability to send pulses. Therefore, every time the servo motor rotates one angle, it will send out a corresponding number of pulses. In this way, it corresponds to the pulse received by the servo motor, or is called a closed loop. In this way, the system will know how many pulses have been sent to the servo motor. At the same time, how many pulses are received, so that the rotation of the motor can be controlled very accurately, so as to achieve precise positioning, which can reach 0.001mm.

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Common fault handling of DC servo motors, in the servo drive system, motor faults are part of them.  

DC servo motor failure 1: The machine tool sometimes appears inaccurate in size during use, and an "overcurrent" alarm appears.  

Analysis: The reasons for the inaccurate size include excessive clearance and lack of lubrication on the guide rails, but sometimes "overcurrent" appears, which is related to the motor. Measure the insulation of the motor with a shaker. The motor has a short circuit. 

Treatment: The motor was disassembled and inspected. It was found that the brush was excessively worn and the carbon powder accumulated, which caused an irregular short circuit to the shell. After cleaning and repairing, the measured insulation meets the requirements, and the installation is normal.

This fault has more chances to appear when the commutator end structure is installed vertically. The brush is too soft and the commutator surface is rough. Therefore, it is best to maintain the motor regularly, or regularly use clean compressed air to power the motor. Brush the powder and blow it away.  

Analysis: The vibration or shock when moving is caused by the controller or motor. Check that the X-axis has frequent faults during rapid movement, and the faults still occur after replacing the control board, so determine that the fault is in the motor.  

DC servo motor failure 3: The turntable of the XH755 machining center has an "overcurrent" alarm when it is rotating.  

Analysis: If there is an "overcurrent" alarm fault, first check the motor, use a multimeter to measure the resistance of the winding to the ground is very small, and determine that it is a motor fault.

Remedy: Disassemble the motor and check it. The inflow of cooling water caused a short circuit and overcurrent. Check that the magnet of the motor is demagnetized, and it is normal after replacing one motor.

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There are many failures in the use of DC servo motors, most of which are on the brushes and commutators. Therefore, if conditions permit, timely maintenance and maintenance are the only way to reduce failures.

DC servo motor failure 4: "error" alarm occurs during the use of the machining center, and the drive has been tripped after inspection. Check that there is an "overcurrent" alarm indication on the controller.  

Analysis: When an "error" alarm appears, it is a rotation command, but the motor does not rotate. When there is an "overcurrent" alarm, the fault is mostly inside the motor.  

Treatment: Remove the motor brush and check that the spring of the brush has been burnt out. Due to the insufficient pressure of the brush, the spark will increase, and part of the commutator segments on the commutator will be burned. The reason for the burning of the spring is that the contact between the brush connecting piece and the brush holder is not good, so that the current passes through the spring and burns out. According to the fault situation, the burned commutator is turned and repaired, and the contact surface between the brush and the brush holder is improved at the same time. Test run after the above treatment, but the motor is shaking. Check again. It turns out that the commutator is rough due to the wrong method during turning. Therefore, the commutator burr and the undercut mica are repaired and used after polishing normal.