DC motor rotor detection methods, detailed DC motor rotor fault detection methods
With the development of modern industry, DC motor has become an indispensable equipment in the production process. However, in the process of use, DC motors will also appear a variety of faults, of which DC motor rotor failure is a relatively common one. Understanding the detection method of DC motor rotor failure, you can find the problem in time and carry out maintenance to ensure the normal operation of the equipment. This article will introduce the detection method of DC motor rotor failure in detail.
First, the type of DC motor rotor failure
DC motor rotor failure mainly has the following types:
1. short-circuit fault: short-circuit fault refers to a short circuit between two or more conductors in the rotor winding, resulting in the loss of the motor's normal operating condition.
2. open-circuit fault: open-circuit fault refers to the rotor winding of a conductor or more conductors between the open circuit, resulting in the motor can not work normally.
3. poor contact fault: poor contact fault refers to the rotor winding conductor and the winding fixed parts of poor contact, resulting in the current can not be normal flow.
4. Broken bar fault: Broken bar fault refers to the fracture of the conductor in the rotor winding, resulting in the current not circulating normally.
Second, DC motor rotor fault detection methods
1. DC motor rotor winding resistance measurement
DC motor rotor winding resistance measurement is one of the most commonly used detection methods. It is necessary to disconnect the power supply of the motor and discharge the capacitor before measurement. Use a multimeter or bridge to measure the resistance of the rotor winding. For a normal DC motor, the resistance value of the rotor winding should be stable within a range. If an abnormal situation occurs, such as the resistance value becoming smaller or larger, it means that the rotor winding is faulty.
2. DC motor rotor winding insulation measurement
The insulation measurement of DC motor rotor winding is one of the important means to detect motor rotor failure. Before the measurement, it is necessary to disconnect the power supply of the motor and discharge the capacitor. The rotor winding is tested using an insulation resistance tester. When testing, attention should be paid to the sensitivity of the testing instrument and the testing time. The normal DC motor rotor winding insulation resistance value should be above several tens of megohms. If the test result shows that the insulation resistance value is too low, it indicates that there is an insulation fault in the rotor winding.
3. DC motor rotor pole position detection
The magnetic pole position of the DC motor is critical to the normal operation of the motor. If the magnetic pole position of the motor is offset, it will cause the motor to lose its normal working condition. In order to detect the magnetic pole position of the DC motor rotor, the motor can be detected using Hall elements or magnetic sensitive elements. Before detection, the motor needs to be mounted on a stable platform and energized. The motor is scanned using Hall elements or magnetic sensitive elements to detect whether the motor magnetic pole position is normal. If the motor magnetic pole position is found to be shifted, then the motor has a rotor fault.
4. DC motor rotor vibration detection
Vibration detection of DC motor rotor can detect rotor faults in time. Before detection, the motor needs to be installed on a stable platform and energized. Use the vibration sensor to detect the motor. When a normal DC motor is running, the vibration amplitude is small, and if the vibration amplitude of the motor is found to be too large, it indicates that the motor has a rotor fault.
There are various methods for detecting DC motor rotor faults, including resistance measurement, insulation measurement, magnetic pole position detection and vibration detection. The selection of suitable detection methods can detect DC motor rotor faults in time and avoid the expansion of the fault. When carrying out the detection, it is necessary to pay attention to safety issues to avoid accidents caused by improper operation.
