Electrical Motor Voltage Imbalance
Reference data and engineering information about electrical motor voltage imbalance for electrical applications.
electricalmotorvoltageimbalance
Overview
Engineering reference data for Electrical Motor Voltage Imbalance in electrical engineering.
Key Formulas
Ohm's Law
Voltage = Current × Resistance.
Power
Electrical power.
Energy
Energy = Power × Time.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Voltage | V | |
| Current | A | |
| Resistance | Ω | |
| Power | W |
Operating Limits
Electrical motors are designed to operate with high efficiency within specified variation limits:
| Parameter | Limit |
|---|---|
| Voltage variation | ±10% |
| Frequency variation | ±5% |
| Combined voltage and frequency variation (arithmetic sum) | 10% |
| Voltage imbalance between phases | 1% |
Voltage Imbalance Derating
When voltage imbalance exceeds 1%, motors must be derated to prevent overheating. The derating factor is applied to the motor's rated capacity.
10 rows
Voltage Imbalance(%) | Derating Factor |
|---|---|
| 0 | 1 |
| 0.5 | 1 |
| 1.5 | 0.97 |
| 2 | 0.95 |
| 2.5 | 0.93 |
| 3 | 0.89 |
| 3.5 | 0.85 |
| 4 | 0.82 |
| 4.5 | 0.78 |
| 5 | 0.76 |
Source: engineeringtoolbox.com