Tests.
Following main parts are part of this motor.

1) Armature winding.
2) Field winding (OR permanent magnets).
3) Commutator.
4) Brush condition & setting.
5) Rocker position & brush holder springs.
6) Interpole winding (depends on design/size).
7) compensation winding (depends on design/size).
8) Taco generator.
9) Lead wires & harness.

We generally take following tests to check the health of the motor:

1) Insulation resistance
2) Winding resistance
3) Growler test
4) Drop test
5) Resistance balance
6) Voltage & current balance (No load)

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).

AC Synchronous motor (PMSM) / Asynchronous motors:

These are motors used in most of automation, CNC applications and have very high efficiency and accuracy. They either use encoders or resolvers to get feedback of position and speed. Following main parts are part of motor.

1) Stator
2) Rotor (with permanent magnet or with copper bar cage)
3) Feedback device like encoder or resolver.
4) Holding brakes (for brake motors).
We check following tests to check health of the motor.
1) Phase balance test.
2) Insulation test.
3) Surge comparison test (whenever required).
4) Generator mode back EMF (for PMSM).
5) Voltage & current balance (No load).
6) Brake operation.

Standard Tests: Apart from winding we also check following for all motors.

1) Bearing condition / vibration test
2) Shaft runout
3) Bearing housing deterioration
4) Oil seal condition
5) Terminal condition
6) RPM
7) Voltage & current balance (No load)

Tests:

1) Bearing condition/vibration test.
2) Shaft runout.
3) Insulation & Phase balance.
4) Bearing housing deterioration.
5) Oil seal condition.
6) Terminal condition.
7) RPM.
8) Voltage & current(No load).