Common fault handling methods for Siemens DC servo motors

Siemens DC servo motor includes stator, rotor core, motor shaft, servo motor winding commutator, servo motor winding, speed measuring motor winding, speed measuring motor commutator, and the rotor core is fixed by 矽 steel punching It is formed on the motor shaft.

 

 

Simons driving principle of the DC servo motor: the servo mainly by pulse positioning, substantially can be understood, the servo motor receives a pulse, the pulse will be a rotation angle corresponding to the displacement achieved because the servo motor itself comprising The pulse function is issued, so every time the servo motor rotates by one angle, a corresponding number of pulses are emitted, so that the pulse received by the servo motor forms an echo, or a closed loop, so that the system knows how many pulses are sent to the servo. The motor, at the same time, receives a number of pulses back, so that the motor can be precisely controlled to achieve precise positioning, which can reach 0.001mm.

 

The common fault handling of Siemens DC servo motors is a part of the servo drive system.

 

DC servo motor failure 1: The machine sometimes has dimensional inaccuracies during use and an “overcurrent” alarm occurs.

      Analysis: The reason for the size is not accurate, the gap is too large, the guide rail is not lubricated, etc., but sometimes there is "overcurrent", it is related to the motor. Use a shaker to measure the insulation of the motor and the motor has a short circuit.

Disposal: Unpack the motor and find that the brush is excessively worn and the toner is piled up, resulting in a random short circuit to the outer casing. After cleaning and repairing, the measuring insulation meets the requirements and is used normally after being installed.

 

The fault occurs in the structure of the commutator end face and is installed vertically. The brush is too soft and the surface of the commutator is very rough. Therefore, the motor can be regularly maintained, or the brush powder can be cleaned with clean compressed air. Blow it away.

 

DC servo motor failure 2: The X-axis of the XH715 machining center sometimes has an impact during the movement, and a loud sound is emitted, and a drive alarm occurs.

 

Analysis: Vibration or shock when moving is caused by the controller or motor. Check that the X-axis is faulty during rapid movement, and it still happens when the control panel is replaced. Therefore, it is determined that the fault is in the motor.

 

Handling: At the beginning, only the brush is taken apart and the brush and the commutator surface are smooth. Therefore, it is considered to be fault-free, but there is still a fault after the installation, so the whole motor is taken apart and found on both sides of the commutator. There are traces of hard rubbing on the surface. Look carefully, it is considered that the brush holder and the commutator are rubbed due to improper installation, causing a short circuit. When the motor speed is high, the speed is out of control. Remove the high-rise part of the brush and repair the short-circuit point on the commutator for troubleshooting.

 

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

      Analysis: There is an "overcurrent" alarm fault to check the motor first, and the multimeter is used to measure the winding resistance to ground is small, and it is determined that the motor is faulty.

 

Disposal: Disassemble the motor check and cause short circuit overcurrent due to the inflow of cooling water. Check that the motor magnet has demagnetization. It is normal after replacing one motor.

 

Siemens DC servo motors have many faults in use, most of them are on the brush and commutator. Therefore, if conditions are met, timely maintenance and maintenance is the way to reduce the fault.

When the DC servo motor is inspected, the measurement current is a commonly used inspection method. Since the measurement using a general ammeter is troublesome, a DC clamp meter is used.

 

DC servo motor fault 4: The machining center has an "error" alarm during use, and it has been checked that the drive has tripped. Check the controller for an "overcurrent" alarm indication.

 

Analysis: The "error" alarm is given to the rotation command, but the motor does not turn. When there is an "overcurrent" alarm, the fault is mostly inside the motor.

 

Disposal: Remove the motor brush and check that the spring of the brush has burned out. Because the pressure of the brush is not enough, the spark will increase and burn some of the commutator on the commutator. The reason for the spring burnout is that the brush connection piece and the brush holder are not in good contact, so that the current is burnt out from the spring by the heat. According to the fault condition, the burned commutator is turned and repaired, and the contact surface between the brush and the brush holder is improved. After the above treatment, the vehicle was tested, but the motor was shaken. Check again. It was originally caused by the wrong method during turning, which caused the commutator to be rough. Therefore, the commutator burr and the lower mica sheet were repaired and polished. normal.

 

Pay attention to the method when repairing the commutator of the DC servo motor. The general principle is that the light can be out. The depth of the knife and the amount of the feed should not be too large when turning. The feed rate is better at 0.05~0.1mm/r. The depth of the knife is less than 0.1mm, the speed is 250~300m/r, and the cutting is performed several times, and the corresponding tool is used. There are certain limits to the turning repair of the commutator. Most of the unilateral sides should not exceed 2mm. If the car is too much, it will affect the performance. Check the manual of the motor used.

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