How To Check For Short Circuit Of DC Motor Windings?

If the DC motor is used for too long or is used improperly, the motor will be short-circuited, and even the machine will be damaged, causing certain losses. Therefore, it is particularly important to check the winding short-circuit in daily life. I will briefly introduce the inspection of the permanent magnet DC motor winding short-circuit. method.

(1) Megohmmeter method. A phase whose resistance value tends to infinity (ie, is not zero) is an open circuit point.

(2) Observation method. Most of the breakpoints occur at the ends of the windings, and it is necessary to see if there are any folds and whether there is desoldering at the joints.

(3) Bridge method. When the resistance of one phase of the motor is larger than the resistance of the other two phases, it means that the winding of this phase has a partial open circuit fault;

(4) The ammeter method. When the motor is running, use an ammeter to measure the three-phase current. If the three-phase current is unbalanced and there is no short-circuit phenomenon, the one-phase winding with a smaller current has a partial short-circuit fault.

(5) Broken cage scout inspection method. During inspection, if the rotor cage is broken, the reading of the millivoltmeter should decrease.

The above is the inspection method of the permanent magnet DC motor winding short circuit of the model organized by Vshida Micromotor for everyone. I hope that after reading our article, it will be helpful to you and solve your problem.