How to do if the DC brushless motor is broken? How to measure the good and bad?

Many friends in the use of DC brushless motor, sometimes there will be some minor problems, but is not very clear what the specific problem, it is very annoying, then the DC brushless motor is bad how to do? How to measure the DC brushless motor good or bad? Here’s a simple analysis for you! I hope it can help everyone!

Check whether there is a broken line, measure the resistance is normal, if it is a brush DC motor, able to roll the rotor, use a multimeter to measure the output DC is normal. If it is a brushless DC motor, draw a three-phase drawing, the rotor can roll, use a multimeter to measure the output AC voltage to see if it is normal, the output voltage is proportional to the speed.

1. Roll the DC brushless motor by hand, if there is significant resistance, indicating that there is a short circuit inside the motor, so the smooth rotation is normal.

2. When connecting the positive and negative poles, there will be a large resistance when twisting by hand, indicating that the line is normal, on the contrary, there is a break point inside.

3. Investigate the reverse spark when energized, no spark better, spark less better, spark even into a line is not good, if the ring fire, do not use.

4. DC motor operation to a stable temperature rise, the motor surface temperature should not exceed 80 degrees Celsius.

5. After the temperature rises steadily, stop, use a multimeter to measure the winding resistance, usually a few ohms.

6. The error between the measured speed and the extra speed should not exceed 10% under extra voltage.

7. Add 1.2 times extra voltage, run for 2 minutes, investigate whether there is any abnormality.

After the above check, the DC brushless motor is normal. Auxiliary use multimeter to measure the voltage between commutator pieces, if there is the same rule voltage between two sections, the winding is fine.

How to do if the DC brushless motor is bad? How to measure the good and bad? The above is a simple detection method, I hope it will help you!

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