How to measure the quality of DC tubular motors

Resistance measurement method: Set the multimeter to the resistance position and measure the resistance value between the two terminals of the DC motor separately. If the resistance value is zero or infinite, it may indicate that the DC motor is damaged. This is because a normal motor should have a certain resistance value. If the resistance value is zero, it may indicate an internal short circuit in the motor; If the resistance value is infinite, it may indicate an internal open circuit of 1 in the motor. ‌
Voltage measurement method: Connect the positive pole of the DC power supply to the positive pole of the DC motor and the negative pole to the negative pole of the DC motor, and then use a multimeter to measure the voltage between the two terminals of the motor. If the voltage value is zero, it may indicate that the DC motor is damaged. This is because a normal motor should be able to generate a certain voltage output after being powered on. ‌
Rotation measurement method: Rotate the rotor of the DC motor by hand to check for any jamming or excessive friction. If there are these issues, repair or replacement of parts may be necessary. This is because the smooth rotation of the rotor is an important indicator for the normal operation of the motor. ‌