Motor Drawing High Current: 8 Causes & Solutions

A motor drawing more current than its nameplate rating is working too hard — wasting energy, overheating, and heading toward failure. High current always has a cause. Here are the eight most common, and how to fix each.

1. Mechanical Overload

The driven load exceeds the motor's rating. Fix: Verify the load; check for binding, blockage, or an oversized duty.

2. Low Supply Voltage

To maintain output power at low voltage, the motor draws more current. Fix: Check and correct supply voltage.

3. Voltage Imbalance

Even a small phase imbalance causes a large current imbalance and localised overheating. Fix: Balance the phase voltages (within 2%).

4. Single Phasing

Running on two phases forces very high current in those phases. Fix: Restore the third phase; add protection.

5. Worn or Failing Bearings

Bearing friction increases the mechanical load, raising current. Fix: Check for bearing noise/heat; replace as needed.

6. Misalignment

Poor coupling alignment adds load and current. Fix: Re-align the motor and driven equipment.

7. Winding Fault

Shorted turns in the winding draw excess current. Fix: An insulation and winding test confirms; rewinding or replacement follows.

8. Wrong Connection (Star/Delta)

A motor connected in delta when it should be star (or vice versa) draws abnormal current. Fix: Verify the terminal connection matches the nameplate and supply voltage.

High current is a motor asking for help. Our engineers can measure, diagnose, and fix the root cause before it becomes a burnout. Contact us or send a motor inquiry for expert guidance from our Mumbai and Ahmedabad teams.