Check to make sure the DC motor’s rotor can turn with no impediments. Switch the voltmeter to “Ohms”. Attach one end of the red lead wires to the DC motor and run the DC motor’s red wire to the battery. Attach the clip of the black lead wire to the DC motor and run the black motor wire to the battery.
How can you tell if a DC motor is bad?
If the meter still reads as an open circuit after the shaft has been rotated, the conducting brushes may be bad.
- Touch the leads of the meter to the two motor leads.
- This type of ohm reading will indicate that the motor is good and the problem resides with the electrical circuit itself and not the DC motor.
How do you test a DC motor with a multimeter?
Turn on the volt ohmmeter and switch it to the “Ohms” setting. Touch the lead ends together and the meter should read a direct short or zero ohms. Attach the other end of the alligator clips to the leads of the volt ohmmeter. You should receive an immediate reading in ohms of approximately 10 to 100 ohms on the meter.
How do you clean a DC motor?
Care should be taken when cleaning, as sweeping particulates further into the motor unit can worsen the condition. Proper cleaning involves vacuuming dry particulates with a soft bristle brush to loosen the accumulated dust. A cloth, moistened with solvent, helps to remove oily dirt.
How do you find the insulation resistance of a DC motor?
The measurement of insulation resistance is carried out by means of a megohmmeter – high resistance range ohmmeter. This is how the test works: DC voltage of 500 or 1000 V is applied between the windings and the ground of the motor.
What can damage a DC motor?
High levels of humidity can cause corrosion within the bearing which causes increasing level of friction which has a growing effect on wear. This may damage the shaft and the bearings restricting the smooth rotating operation of the motor which can affect speed and torque.
How do you know if a motor is good?
Start by completely disconnecting the spindle motor from all power sources. Check each wire, including T1, T2, T3 and the ground wire. If the reading is infinite, your motor should be fine. If you get a zero reading or any continuity reading, you have either a motor problem or a cable problem.
How many amps does a 12 volt DC motor draw?
When calculating the current draw in amps with a 12 VDC Motor you can use the following guidelines: 0.1 HP = 8 amperes. 0.2 HP = 17 amperes. 0.5 HP = 42 amperes.
How do I test a motor with a multimeter?
To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings. Alternatively, if you get a reading of 0, you might have a cable issue.