How To Check The Starter Motor Starting Capacitor And Armature

Electric motors are one of the important components in construction machinery. During use, there may be some problems when the motor starts. For example, difficulty in starting, abnormal noise during starting, etc. These problems are often related to the motor's starting capacitor, armature, and magnet. In this article, MyMROmarts will detail how to check the motor start capacitor, starter motor armature, and magnet on the starter motor.

How To Check The Electric Motor Start Capacitor

The motor starting capacitor is a device that stores electrical energy. The function is to provide auxiliary starting help when the motor is started. When the diesel starter motor starts, its starting current is relatively large. The starting capacitor can provide extra current to help the starter motor overcome the starting resistance and make it start smoothly. Once the starter motor reaches operating speed, the start capacitor is automatically disconnected.

a. Before checking the starting capacitor of the motor, please make sure that the mechanical equipment has been powered off and wait for enough time to prevent electric shock accidents.

b. First, check the appearance of the start capacitor for physical damage such as deformation, cracks, or leakage. If any abnormality is found, it should be replaced in time.

c. Using a capacitance tester, connect the test leads to the two pins of the capacitor. Watch to see if the capacitor charges and holds a charge. Normally the capacitor should charge properly and hold the charge after the test lead is removed.

How To Check The Starter Motor Armature

The starter motor armature is one of the important components of the motor, which is responsible for generating a rotating magnetic field to start the motor. If the armature has problems such as an open circuit, short circuit, or insulation damage, it will cause the starter motor to fail to start normally or produce abnormal noise. It hinders the starter motor from driving other heavy duty diesel parts and construction machinery to work normally.

a. Same as checking the capacitor, before checking the armature, be sure to disconnect the power supply to ensure safety.

b. Remove the motor from the construction machine.

c. First, observe the appearance of the armature. The armature should have no visible physical damage such as scratches, cracks, etc.

d. Use an insulation resistance tester to test the state of the armature insulation. Connect the two probes of the tester to each end of the armature and disconnect the armature from the case. Under normal circumstances, the insulation resistance of the armature should be very high, close to infinity. If the insulation resistance is low or close to zero, there may be an insulation problem with the armature and the armature needs to be repaired or replaced.

e. Using the ohm scale of the multimeter, measure the resistance value of the armature circuit. Under normal circumstances, the resistance value of the armature circuit should be within the specified range. If there is an open or short in the armature circuit, the armature may need to be repaired or replaced.

How To Check If The Magnets On The Starter Motor Came Loose

a. First, check whether the magnet on the motor is firm, and shake it gently by hand to see if it feels loose. If the magnet is found to be loose, the bolts or nuts should be tightened in time.

b. Start the starter motor and listen carefully for any abnormal noise. Sometimes a loose magnet may produce a noticeable vibration or banging sound.

c. Use a magnetometer to measure the magnetic strength of the motor magnets. If the magnet is weak, it could be a loose magnet or a problem with the magnet itself.

Through the introduction of this article, we have learned how to check the starting capacitor of the motor in construction machinery, the armature of the starter motor, and the magnet on the starter motor. These inspection methods can help construction machinery maintenance personnel to find and solve problems related to motor startup in time. Ensure the normal operation of the starter motor. Thereby driving the normal work of the engine alternator and large equipment.