Armature Comparator

The Armature Comparator is designed to test armatures by comparing them to an OEM or known good armature. By comparing to the "Known Good Armature", you can check torque as well find shorts, bad connections, opens, and leakage to ground. The Oscilloscope allows you to find out what is wrong with the armature i.e.: shorts, opens, bad connections and leakage to ground. The Analog Meter allows you to set the electronic circuits and to read torque after the machine is set. The Analog Meter will also read the approximate resistance of the leakage to ground in ohms. There are two types of windings used in automotive armatures, LAP & Wave. The Armature Comparator will locate faults in both types of windings. Lap Windings are wound using parallel windings. The individual coils are connected to the commutator bars which are adjacent or close to each other. The Wave Windings use a series of windings and the individual coils are connected to the commutator bars which are approximately two pole pitches apart. What this means to you is that you will be able to locate problems in an armature before it is put in a unit and read the armature torque.

TORQUE.......Why look for it? Because an armature will loose torque if any or all of the following conditions exist.

Non-OEM lamination steel

Small wire size or lower grade copper used in the hairpins

Laminations being burned to hot, before being rewound

Not enough laminations

Improper twist of the hairpins during winding or rewinding, (improper commutation).

Relocation of the hairpins when the commutator is replaced, (changing commutation).

It has been found that most low strength (Torque) armatures have a combination of the above deficiencies in them.

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Available Service Parts