1. What is 3 Phase Motor Winding Resistance?

The winding resistance of a 3-phase motor is the electrical resistance of the motor's windings, which affects the motor's performance, efficiency, and heat generation. It's a critical parameter for motor design and maintenance.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( R \) — Winding resistance (ohms)
• \( P \) — Power (watts)
• \( I \) — Current (amperes)

Explanation: The formula calculates the resistance per phase in a balanced 3-phase system based on the total power and current.

3. Importance of Winding Resistance Calculation

Details: Knowing the winding resistance helps in motor performance analysis, fault detection, efficiency calculations, and proper sizing of protection devices.

4. Using the Calculator

Tips: Enter the motor's power in watts and current in amperes. Both values must be positive numbers. The calculator assumes a balanced 3-phase system.

5. Frequently Asked Questions (FAQ)

Q1: Why is winding resistance important?
A: It affects motor efficiency, voltage drop, heat generation, and helps identify winding faults or degradation.

Q2: How does temperature affect winding resistance?
A: Resistance increases with temperature. Measurements should be temperature-corrected for accurate comparisons.

Q3: What are typical resistance values for motors?
A: Values vary greatly by motor size and design, typically ranging from milliohms to several ohms.

Q4: Can I use this for single-phase motors?
A: No, this calculator is specifically for balanced 3-phase systems.

Q5: How accurate is this calculation?
A: It provides a theoretical value. Actual resistance may vary due to factors like temperature, skin effect, and manufacturing tolerances.