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What is an armature growler?
A growler is a useful piece of equipment used for testing armatures. This creates an alternating magnetic flux in the iron core/armature body which also passes through the armature coils. This arrangement allows the armature to be tested for both shorted and open windings.
Which of the following is used to test the short circuit armature?
growler. A growler is an electrical device used for testing insulation of a motor for shorted coils.
How do you check engine rotors?
HIGH CURRENT ROTOR TEST – This test is performed by applying high current through the shaft of the rotor (rotor out of stator) and thermally scanning (infrared or thermoscan) the rotor O.D. searching for shorted laminations. These shorted laminations cause localized hot spots which cause uneven heating of the rotor.
What is the function of growler?
A growler is an electricity device used for testing insulation of a motor for shorted coils. A growler consists of a coil of wire wrapped around an iron core and connected to a source of alternating current.
What is the purpose of a growler?
For those not yet in the know, a growler is a container typically made out of glass, ceramic or aluminum, that is used to transport beer. An air-tight jug, it allows you to take draft beer from one place to another without losing quality.
What happens if your rotor breaks?
Even the slightest defect on the rotor will cause low-frequency vibrations, known as “judder,” during braking. If you notice this, you should see your mechanic right away. Serious rotor failures can cause a complete wheel lock-up and the driver will lose control of the vehicle.
What is the most common cause of commutator problems?
Warning commutator surface conditions Inconsistent film color and deformation of the commutator surface are warning signs for developing trouble conditions with rapid brush and commutator wear. Streaking: Results from metal transfer to the brush face. Light loads and/or light spring pressure are most common causes.
How are armature shorts used in a growler?
If something ferromagnetic is brought near the shorted turn it will interact with the induced field. If the sensor is long it will be easier to feel torque on it for a given force and if it is thin it will make a better probe. Two laminated jaws that target sits against clearly visible.
How can I test my armature with a growler?
Testing for shorts to the ground or the core of the armature is a simple continuity test. Instead of a piezo beep though, a short will trigger the growler to turn on, which means the armature will jump a bit and everything will emit a loud A/C hum. It certainly makes testing more interesting!
What kind of blade does a growler use?
The growler is switched on and a thin piece of ferrous metal – usually an old hacksaw blade, is run along the core of the armature. If a short exists, the hacksaw blade will vibrate against the core of the armature above the shorted windings.
What kind of probe does a growler have?
A Growler may have a single probe with two tips at a fixed distance apart. It can be placed on two adjoining commutator segments with the growler operating. This can be used to measure the current in a particular winding.