Motor Current Analysis

Proviso Systems Ltd are able to offer two choices in the motor current analysis field:-

1) We can supply an intelligent online solution. The Artesis MCM (Motor Current Monitor) which encompasses the following

• Artesis MCM LV Line  (for Low Voltage Line-driven Motors)
• Artesis MCM LV Inverter  (for Low Voltage Inverter-driven Motors)
• Artesis MCM MV&HV  (for Medium & High Voltage Motors)
• Artesis MCM MV&HV  (for Military applications)

2) We can carry out Motor Current Analysis as a field service. (Larger AC Motors Only)

Induction Motor Testing

"Motor Monitor"

Motor Current Analysis

Early Detection of rotor related faults in AC Induction Motors

• Cracked or broken rotor bars
• Cracked rotor end rings
• High resistance joints in squirrel cage windings
• Casting porosities or blow holes in aluminium
• Poor joint brazing in fabricated rotors
• Rotor winding problems in slip-ring induction motors
• Stationary or rotating air gap irregularities
• Unbalanced magnetic pull
• Mechanical unbalance
• Bent shaft, thermal bow
• Out-of-round stator, rotor or bearings.

SUMMARY SHEET

EXAMPLE OF MOTOR WITH DAMAGED ROTOR

---------Rotor Damage Level-----

Date Time Moderate Severe

DDMMYY HHMM Amps % Indx 0 1 2 3 4 5 6

------ ---- ---- --- ---- I---+---+---+---+---+---+->

020497 1735 59.3 28 7.5 **************************>

Rotor winding condition recommendation No.19 03/04/97

This rotor winding has developed several broken bars. The risk of

secondary damage to the stator winding, or other elements of the motor, could be imminent. It is recommended that this motor be removed from service immediately.

ACC FAN 01 UA

---------Rotor Damage Level----- ------Air Gap---------

Date Time Moderate Severe Dynamic Static

DDMMYY HHMM Amps % Indx 0 1 2 3 4 5 6 0 20 40 60 Change

------ ---- ---- --- ---- I---+---+---+---+---+---+->

28/07/99 1429 140. 89 .5 **

Rotor winding condition recommendation ACC-01-UA 28/07/99

This rotor winding is in a healthy condition and should be re-surveyed

in twelve months from this date or after 200 starts, whichever is first.

Extended Analysis:

You are advised to enter BUILD details to test for mechanical influences.

Latest date for next Rotor Survey - 28th July 2000.

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Last modified: 01-07-2008 23:34