More than half of all electricity in the United States is run through
electric motors. A typical large industrial motor consumes its own capital
cost's worth of electricity every few weeks—that's a powerful reason
for spending a little extra on a more efficient motor.
Most of the scope for energy savings is in industrial motors. Old
motors can be replaced by more efficient motors, and the efficiency of
any motor can be improved through better controls, use, and maintenance.
- Power Factor
- Voltage Imbalance
- Motor Efficiency
- Soft-Start Controls
- Controlling Load Speed and Motor Power with Pulley Diameters
- Electronic Variable Speed Drives
- Repair or Replace
- Replace Failed Motors with Energy Efficient Motors
Voltage imbalance causes large current imbalance
A voltage imbalance of 2.5% can cause a current imbalance of 28%. Voltage
imbalance over 1% degrades motor performance, shortens motor life and
can void the motor warranty. In addition, motor efficiency drops by about
1% when voltage imbalance is about 2%.
Unbalanced Voltages (56KB)
Over time, winding insulation degrades, usually due to some combination
of overheating, aging and over-voltage transients. As winding insulation
degrades, the efficiency of the motor may also degrade, causing its operating
temperature to increase. Another indication of winding failure is a greater
than 10% difference in the amperage drawn by each leg of a three-phase
motor. Eventually, winding failure can lead to shock, fire hazard and
total motor failure.
Sometimes motor failures are related to mechanical breakdowns, especially
for motors in high-vibration environments. 75% of all mechanical failures
are due to bearing failure.
To contact a Quality Energy representative for a consultation click