How to detect the quality of the DC brushless motor with a multimeter?

DC brushless motor is a kind of micro DC motor, which is widely used, such as automobile, tools, industrial control, automation and aerospace and so on. Brushless DC motor has the characteristics of energy saving, long life, low noise, small and lightweight. Although the brush motor has the advantages of high efficiency, miniaturization, power drive, low production cost, there are also brush friction noise, spark, electronic interference, and shorten the service life of the motor due to brush wear. In order to solve these problems, the brushless DC motor has emerged. The brushless DC motor uses the magnetic force of the stator coil loop to drive the rotor of the permanent magnet, and realizes the current switching between the brush and the rectifier with the brush DC motor through the sensor and electronic circuit. Thanks to the development of peripheral technologies such as semiconductors, brushless DC motor has become the first motor to realize this function. In the ratio of current and torque, voltage and speed, it has the characteristics of DC motor, while the DC motor has the characteristics of AC motor, which combines the advantages of the two. Brushless DC motor has the advantages of small appearance, large output power, long life, no spark and interference, has a wide range of uses.

Today, the first automotive motor market in the application field of brushless DC motor. Just as changing the automobile steering device from the previous oil pressure type to electric type can achieve the fuel saving effect of 3-5%, with the energy saving effect of electric technology becoming more and more obvious, more and more components are being replaced by the motor. It also includes some functions with high requirements for control performance, and must have a long service life of the motor has gradually entered the dominant position. In addition, the motor is also used in the air conditioning compressor after the vehicle electric steering device, and is even expected to be used as a drive motor in the electric vehicle industry in the future. Therefore, to convert the limited electricity into excellent kinetic energy, and the development of a small motor that can be set in a narrow space will be the inevitable trend of the motor development in the future.

Then, the quality inspection of brushless motor is particularly important. As a professional manufacturer of dc micro motor, we use a multimeter to detect the parameters and quality of the factory motor. A multimeter for test motors is a tool widely used in motor repair and troubleshooting. It can detect the resistance, voltage, current and other important parameters of the motor, to help engineers to quickly and accurately determine the state of the motor and the cause of failure. First, the multimeter can be used to test the resistance of the motor. By measuring the resistance of the winding, electrical appliances and other components of the motor, it can understand whether the motor is damaged or has a bad conduction phenomenon. This is necessary for locating motor faults and for accurate maintenance. Secondly, the multimeter can also be used to test the voltage of the motor. Testing the voltage of the motor with a multimeter can detect whether there is abnormal voltage, loose line joint or insulation damage in the motor circuit, so as to more accurately judge the cause of the fault and make timely maintenance and replacement decisions. Finally, the multimeter can also be used to test the current of the motor. By establishing the current measurement circuit in the circuit, the current size of the motor can be directly measured, and then judge whether the motor is working normally, whether the power supply is good and whether there is overload and other problems.

The detection step is to first turn the motor shaft by hand, feel whether it is stable, and then use the multimeter to measure the motor line resistance, if there is Hall, also measure, and measure the Hall side by hand to turn the motor shaft, observe the resistance value. The method of using the multimeter to detect it: dial the multimeter range to the DC voltage 10V, the meter pen is connected with the two electrodes of the motor, and then turn the motor rotor with the hand. If the meter needle is tilted to one side, the motor is good, and if it does not move, it is bad.

The above is our VSD motor to share with you about the multimeter expertise. For more information, please contact our professional customer service personnel to answer. Thank you for clicking and watching.