What are the common electrical faults and solutions for brushless motor motor fully automatic rotor into magnet steel machine?
The following is a brushless motor motor automatic rotor into the magnet steel machine common electrical faults and the corresponding solutions:
First, the power supply failure
Fault phenomenon:
Equipment can not be started: may be the total power is not connected, the power switch is damaged, or the power line is broken, short-circuit, resulting in equipment can not get a normal working power supply.
Power supply voltage instability: it will cause some of the electrical components of the equipment to work abnormally, such as unstable suction of the magnet adsorption device, motor speed fluctuations, affecting the quality and efficiency of the rotor into the magnet.
Solution:
First use a multimeter to check the power switch to see if it is normally connected to the power supply. If the switch is normal but the device is still without power, check along the power line to find out the break or short-circuit point and repair it; for the short-circuit part, the insulation needs to be repaired or the damaged line needs to be replaced.
For unstable power supply voltage, use a voltmeter to continuously monitor the power supply voltage, and check whether the power supply line has poor contact or is overloaded. If the power supply line is normal, it may be the power supply itself, consider using a voltage stabilizer to stabilize the voltage; at the same time, check the power supply capacitors, transformers and other components, need to be replaced when damaged.
Second, motor failure
Failure phenomenon:
Motor does not run: may be damaged motor winding, motor drive failure, motor power supply abnormalities or motor control signal loss, resulting in the inability to drive into the magnet steel mechanism of the movement.
Motor running abnormally: manifested as motor speed is too fast or too slow, there is abnormal noise, motor overheating, may be the motor drive parameters are set incorrectly, the load is too large, the winding is short-circuited or open-circuited, the motor bearings are damaged and other factors.
Solution:
When the motor does not run, first check whether the three-phase power supply of the motor is normal. If the power supply is normal, check the input and output signals of the motor driver to see if it works properly, either by observing the status indicator of the driver or using an oscilloscope to view the control signals. If the driver is damaged, it needs to be replaced or repaired. For the motor winding, use the insulation resistance meter to measure its insulation resistance, if the insulation resistance is too low, the winding may be short-circuited or damp, it should be dried or rewound.
When the motor is running abnormally, check the motor load first to exclude overload conditions. Adjust the motor drive parameters to ensure compliance with equipment operating requirements. For abnormal speed, check and adjust the speed setting and feedback signal of the driver. When the motor has abnormal noise, check and replace the badly worn bearings; if the motor is overheated, check the heat dissipation system, clean up the heat sink to ensure good heat dissipation, and at the same time, check whether there is a local short-circuit or open-circuit in the winding, and promptly repair or replace the motor.
Third, the magnet adsorption device failure
Failure phenomenon:
Magnet steel adsorption force is insufficient: resulting in the magnet can not be firmly adsorbed, affecting the operation into the magnet steel, may be damaged electromagnetic coil, power supply abnormalities or control circuit failure.
Electromagnetic coil short circuit or broken circuit: so that the magnet steel adsorption device can not work properly, and may even cause electrical hazards.
Solution:
For insufficient magnet steel adsorption, first check its power supply, use a multimeter to measure the power supply voltage of the electromagnetic coil to make sure the voltage is normal. Check the control circuit to make sure whether the control signal is correct, which can be done by checking the working status of relevant relays, contactors or electronic switches. If the solenoid coil is aging, the solenoid coil needs to be replaced.
When the solenoid coil is short-circuited or disconnected, use an insulation resistance meter to check the insulation resistance of the coil and determine the fault location. For the short-circuit part, repair the insulation; for the broken part, find the break point and repair, can not be repaired when the electromagnetic coil needs to be replaced.
Fourth, sensor failure
Fault phenomenon:
Position sensor failure: it will make the rotor or magnet position detection inaccurate, resulting in magnet installation position offset, affecting the precision and uniformity of the incoming magnet.
Counting sensor failure: it causes inaccurate counting of the number of incoming magnets, which may lead to overcounting or omission of the number of magnets, affecting production management and quality control.
Solution:
For position sensor failure, check whether its connection line is loose or damaged, use multimeter to check line conductivity, repair or replace the damaged line. Clean the sensor sensor head, remove dust, oil and other impurities. If the sensor is damaged, replace the sensor with the same type and recalibrate to ensure accurate detection position.
For counting sensor failure, check whether its counting parameters are set correctly, adjust the sensitivity and counting mode according to the magnet characteristics. At the same time, check the power supply to ensure normal operation; if the sensor is damaged, replace and test the accuracy of counting.
V. Control circuit failure
Fault phenomenon:
Relay and contactor failure: contact ablation, sticking will make the circuit can not be normal on and off, affecting the sequence of equipment action, such as not being able to start into the magnet operation or operation can not be stopped.
Controller failure: equipment action sequence is chaotic, may be the controller program error, input and output signal abnormalities or dead.
Solution:
For relay and contactor failure, check the contact status, use sandpaper to polish the ablated contacts, if the contacts are sticking badly or the spring is invalid, it needs to be replaced. At the same time, check the working condition of the coil, and replace it when it is damaged.
For controller failure, if the program is wrong, use programming software to check and modify the program logic. Check the input and output signals to confirm that the signal transmission is normal; if the controller is dead, try to restart, if often dead, consider updating the software or check the hardware failure, if necessary, replace the controller.
Six, communication failure
Fault phenomenon:
Communication interruption between different parts of the device: for example, PLC and driver, HMI and controller can not communicate normally, resulting in the device can not be coordinated, the HMI can not display the status of the device or can not be controlled remotely.
Communication data error: the data transmitted during the communication process is garbled, lost or incorrect, so that the device receives incorrect instructions, triggering abnormal action or shutdown.
Solution:
Check whether the communication line is damaged, whether the plug is loose, for shielded cable, make sure the shield is well grounded, repair or replace the damaged line.
Check the communication protocol settings of both sides of the communication, including baud rate, data bits, stop bits, check bits and other parameters are consistent, inconsistent when modified. Exclude electromagnetic interference, shielding, filtering and other measures can be used, the use of anti-interference ability of the communication cable to ensure stable communication.
Through the analysis and treatment of the above common electrical faults, can effectively protect the brushless motor motor automatic rotor into the magnet steel machine electrical system normal operation, improve the reliability of the equipment and production efficiency.
※ If you still can't solve the equipment failure by the above ways and means, please contact the technical specialist of Xinhui Electromechanical Equipment Co.
