The work of permanent magnet DC geared motors is closely related to electricity, but if there is a malfunction in the circuit, not only is it affected, but we can not master its repair method, so it is necessary for Dalan Motor Editor to learn how to find out Break down and fix it.
If the armature winding is severely short-circuited, the motor will burn out. If only some coils are short-circuited, the motor can still run, but the spark on the surface of the commutator becomes larger, and the armature winding heats up seriously. If it is not found and eliminated in time, it will eventually cause the motor to burn out. Therefore, when a short-circuit fault occurs in the armature winding, it must be eliminated in time. The armature winding short-circuit fault mainly occurs in the inter-turn short circuit of the same slot winding element and the short circuit between the upper and lower winding elements. The common methods to find the short circuit are:
1. The short-circuit tester method is the same as the method for finding the inter-turn short-circuit of the stator winding of the three-phase asynchronous motor. After the short-circuit tester is connected to the AC power supply, it is placed on a slot of the armature core and the broken saw blade is placed in other slots The mouth moves equally, when there is a large amplitude vibration, there is a short circuit fault in the winding element in the slot.
2. Apply 6.3V AC voltage (DC voltage can also be used) to the two commutating plates separated by K / 2 or K / 4, and use the two test leads of the millivolt meter to contact the two commutating plates of the commutator in turn. Detect the inter-chip voltage of the commutator. During the detection process, if it is found that the reading of the millivoltmeter suddenly becomes smaller, for example, the test reading between the two commutating pieces suddenly becomes smaller, it means that the armature winding element connected to the two commutating pieces has a turn-to-turn short circuit. If the voltage between the commutating slices is equal during the detection process, it means that there is no short circuit fault.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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